AHC Error code S307-82

[Chris T]

so having replaced an AHC hose and shock im now dealing with an issue possibly electrical?

there has previously been and error code for the rear ride height sensor. however i took that out and cleaned it. cleared the code on techstream and scanned a few times, it hasn't re appeared, so shouldn't be the issue?
the car refuses to pump to fill the new hose with fluid and bring itself back up to ride height. when i plug into techstream i get no error codes. when i try to run an active test it spits out the error "S307-82 ecu cannot preform the requested active test".
what could be causing this behavior?
ive tested all the fuses and relays they measure fine. what else should i be looking at/ any info on the specific error code?

 

[whitec13]

Did you bleed everything properly following your repairs? I know the AHC systems are fairly finicky. Admittedly, I do not have AHC or any first hand experience, but if you open a sealed system and don’t purge air, you will inevitably have problems.

 

[Chris T]

Did you bleed everything properly following your repairs? I know the AHC systems are fairly finicky. Admittedly, I do not have AHC or any first hand experience, but if you open a sealed system and don’t purge air, you will inevitably have problems.

I've read through and followed Toyota's docs for bleeding the system.
I'm unable to bleed the system as the pump doesn't run so hasn't primed it. I've cracked the bleeders open and nothing. No fluid is drawn down.
Hence the question about the code, could it have something to do with pump not running.

 

[IndroCruise]

so having replaced an AHC hose and shock im now dealing with an issue possibly electrical?

there has previously been and error code for the rear ride height sensor. however i took that out and cleaned it. cleared the code on techstream and scanned a few times, it hasn't re appeared, so shouldn't be the issue?
the car refuses to pump to fill the new hose with fluid and bring itself back up to ride height. when i plug into techstream i get no error codes. when i try to run an active test it spits out the error "S307-82 ecu cannot preform the requested active test".
what could be causing this behavior?
ive tested all the fuses and relays they measure fine. what else should i be looking at/ any info on the specific error code?

So, 2006 series – LC100 (which engine)? or LX470?

“S307-82 ecu cannot preform the requested active test”

Code S307-82 does not come from the well-recognised lists of Diagnostic Trouble Codes (DTC’s) for the AHC/TEMS systems as found in the Toyota/Lexus Factory Workshop Manuals (FSM) forLC100 and LX470 – example attached. Code S307-82 seems more likely to come from the abundant bugs and conflicts that exist in various versions of the software in Techstream itself, especially in the 'unofficial copies' that are widely available. Other Members with more knowledge of the Techstream software may be able to advise???

However, reading through your posts, Techstream (or suitable scanner?) appears to working? A Rear Height Control Sensor Circuit Diagnostic Trouble Code (DTC) has been reported -- presumably DTC C1713 (?) -- but has not returned?

No other DTC's have been reported. This is important information. DTC's C1751 (AHC Pump & Motor Cicuit), C1762 (Fluid Pressure Anomaly - Pump & Motor Does Not Supply Fluid), C1711, C1712, C1713 (Height Control Sensor Circuits) are a few that come quickly to mind -- any of which would prevent the Active Test from working and would provide a lead.

Just to be clear -- absence of a DTC for Height Control Sensors C1711, C1712, C1713 does not indicate the respective Height Control Sensor Circuit (meaning Sensor + Connector + Harness) is healthy -- it means only that the voltage signal received by the Suspension Electronic Comtrol Unit (ECU) is within the acceptable range of 0.3 volts to 4.7 volts and is stable -- see extract below. It is common for aged Height Control Sensors to cause strange Front or Rear height effects due to wear and tear causing the relevant voltage signal to be within the FSM-specified range but incorrect for the actual height of the vehicle at Front or Rear. Cleaning and inspection of Sensors is insufficient -- faults go beyond the ability of the eye to see, testing per FSM is essential. In reality, replacement of aged Sensors is the prudent course after inspecting and testing connectors and harnesses and finding them satisfactory.

Starting with simple things first -- assume that AHC Pump has not self-primed after recent work:

EITHER:

Use the manual "HEIGHT CONTROL OPERATION - ACTIVE TEST" – following the well-described version at Paragraph 5 at Page 6 of the attachment uploaded long ago by AHC guru @PADDO. This version uses Data Link Connector #1 (DLC1) in the engine compartment.

The DLC1 method is more convenient than working under the dashboad using DLC3 as described in some Workshop Manuals. The terminals used in DLC1 are slightly different to the terminals in the DLC3, but they both connect ultimately to the Suspension Electronic Control Unit (ECU) in exactly the same way. The test procedure and sequence is exactly the same in both cases (except for the different terminals) and must be followed EXACTLY for the "HEIGHT CONTROL OPERATION - ACTIVE TEST" to work, as set out below in longhand:

1. With Ignition OFF, connect terminals Ts and E1 at DLC1 (this is the socket in the engine bay, usually over the RHS wheel arch with the word DIAGNOSTIC on the top cover. The terminal "map" is shown inside this cover. Instead of Special Service Tool (SST) 09843-18020 which is just a piece of bridging wire, find something simple -- I use an unbent paperclip for this test. Voltages are low here low, about 4.5 volts, and will not cause a problem -- but be very careful to connect the correct terminals,

2. Turn ignition ON and START the engine,

3. Push the DOWN button on the Height Select switch within 5 seconds of engine start and hold it down for 5 seconds. There will many flashing lights in the instrument cluster (because the ECU has been by-passed). Ignore these -- they will revert to normal later, after the test, when the bridge (paperclip) is removed and the AHC ON/OFF switch is pressed down for a couple of seconds,

4. Use the combined settings to move front or rear up or down -- sometimes the combined settings are overlooked -- listen for the operation of the AHC Pump and its motor,

5. When finished, switch OFF engine, then remove the bridge (paperclip),

6. Re-start, push down the AHC ON/OFF for a couple of seconds to clear the test.

OR:

If the Active Test does not work, it is highly likely that it is prevented by other fault conditions. Nevertheless, it is worthwhile to try to prime the AHC Pump by a brief (10 seconds) connection directly to the battery, being sure to follow correct polarity to ensure correct direction of pump rotation,

If neither effort works, please revert for further advice.

 

[Chris T]

So, 2006 series – LC100 (which engine)? or LX470?

“S307-82 ecu cannot preform the requested active test”

Code S307-82 does not come from the well-recognised lists of Diagnostic Trouble Codes (DTC’s) for the AHC/TEMS systems as found in the Toyota/Lexus Factory Workshop Manuals (FSM) forLC100 and LX470 – example attached. Code S307-82 seems more likely to come from the abundant bugs and conflicts that exist in various versions of the software in Techstream itself, especially in the 'unofficial copies' that are widely available. Other Members with more knowledge of the Techstream software may be able to advise???

However, reading through your posts, Techstream (or suitable scanner?) appears to working? A Rear Height Control Sensor Circuit Diagnostic Trouble Code (DTC) has been reported -- presumably DTC C1713 (?) -- but has not returned?

No other DTC's have been reported. This is important information. DTC's C1751 (AHC Pump & Motor Cicuit), C1762 (Fluid Pressure Anomaly - Pump & Motor Does Not Supply Fluid), C1711, C1712, C1713 (Height Control Sensor Circuits) are a few that come quickly to mind -- any of which would prevent the Active Test from working and would provide a lead.

Just to be clear -- absence of a DTC for Height Control Sensors C1711, C1712, C1713 does not indicate the respective Height Control Sensor Circuit (meaning Sensor + Connector + Harness) is healthy -- it means only that the voltage signal received by the Suspension Electronic Comtrol Unit (ECU) is within the acceptable range of 0.3 volts to 4.7 volts and is stable -- see extract below. It is common for aged Height Control Sensors to cause strange Front or Rear height effects due to wear and tear causing the relevant voltage signal to be within the FSM-specified range but incorrect for the actual height of the vehicle at Front or Rear. Cleaning and inspection of Sensors is insufficient -- faults go beyond the ability of the eye to see, testing per FSM is essential. In reality, replacement of aged Sensors is the prudent course after inspecting and testing connectors and harnesses and finding them satisfactory.

View attachment 3984638
Starting with simple things first -- assume that AHC Pump has not self-primed after recent work:

EITHER:

Use the manual "HEIGHT CONTROL OPERATION - ACTIVE TEST" – following the well-described version at Paragraph 5 at Page 6 of the attachment uploaded long ago by AHC guru @PADDO. This version uses Data Link Connector #1 (DLC1) in the engine compartment.

The DLC1 method is more convenient than working under the dashboad using DLC3 as described in some Workshop Manuals. The terminals used in DLC1 are slightly different to the terminals in the DLC3, but they both connect ultimately to the Suspension Electronic Control Unit (ECU) in exactly the same way. The test procedure and sequence is exactly the same in both cases (except for the different terminals) and must be followed EXACTLY for the "HEIGHT CONTROL OPERATION - ACTIVE TEST" to work, as set out below in longhand:

1. With Ignition OFF, connect terminals Ts and E1 at DLC1 (this is the socket in the engine bay, usually over the RHS wheel arch with the word DIAGNOSTIC on the top cover. The terminal "map" is shown inside this cover. Instead of Special Service Tool (SST) 09843-18020 which is just a piece of bridging wire, find something simple -- I use an unbent paperclip for this test. Voltages are low here low, about 4.5 volts, and will not cause a problem -- but be very careful to connect the correct terminals,

2. Turn ignition ON and START the engine,

3. Push the DOWN button on the Height Select switch within 5 seconds of engine start and hold it down for 5 seconds. There will many flashing lights in the instrument cluster (because the ECU has been by-passed). Ignore these -- they will revert to normal later, after the test, when the bridge (paperclip) is removed and the AHC ON/OFF switch is pressed down for a couple of seconds,

4. Use the combined settings to move front or rear up or down -- sometimes the combined settings are overlooked -- listen for the operation of the AHC Pump and its motor,

5. When finished, switch OFF engine, then remove the bridge (paperclip),

6. Re-start, push down the AHC ON/OFF for a couple of seconds to clear the test.

OR:

If the Active Test does not work, it is highly likely that it is prevented by other fault conditions. Nevertheless, it is worthwhile to try to prime the AHC Pump by a brief (10 seconds) connection directly to the battery, being sure to follow correct polarity to ensure correct direction of pump rotation,

View attachment 3984639

If neither effort works, please revert for further advice.

Thanks for all the help.

First up it's a 1HD-FTE

Secondly, the version of tech stream I'm running is the virtual appliance from the "how to tech stream in 5 minutes" thread and it seems to work fine. Reads changes in ride height when I jack the car up , steering angle, changes of the damping force dial and what not.

Indeed the rear ride height sensor error hasn't returned. Nor is there any other error codes being flagged.

I've tired the manual test using the exact setup you described and I get absolutely nothing out of the pump. No height change and no audible sound from the pump.

I do know the pump is fine, as I've powered it directly from the battery and primed the system.

I've tried doing the control valve assembly and that provides no noise or vibration on the assembly so could it be something stuck in the assembly?

What's the next course of action?

 

[uHu]

What's the next course of action?

So, is it now sitting on the bump stops? What are the actual height readings reported in TechStream?
It might be time to go through each component and check them according to the diagnostics section in the FSM.

 

[Chris T]

So, is it now sitting on the bump stops? What are the actual height readings reported in TechStream?
It might be time to go through each component and check them according to the diagnostics section in the FSM.

The front is down on the bumps, has been since the hose failure ,the rear is not. It has remained pressurised.

The front is reading -3 inches and the rear is reading 0.8 inches.

I've run the pump test, that comes back inconclusive. The test results in no movement or noise from the pump. However running it directly of the battery it sounds like its running and having cracked the hose of it. It jetted fluid across the engine bay.

I've run the test on the control valve solenoids and that came back inconclusive. Again no noise or vibrations from the valve assembly.

Any other components/ procedures to check?

 

[IndroCruise]

The front is down on the bumps, has been since the hose failure ,the rear is not. It has remained pressurised.

The front is reading -3 inches and the rear is reading 0.8 inches.

I've run the pump test, that comes back inconclusive. The test results in no movement or noise from the pump. However running it directly of the battery it sounds like its running and having cracked the hose of it. It jetted fluid across the engine bay.

I've run the test on the control valve solenoids and that came back inconclusive. Again no noise or vibrations from the valve assembly.

Any other components/ procedures to check?

Good to know @Chris T that a 2006 LC100 with AHC and 1HD-FTE turbodiesel is the subject of discussion. If underbody condition is good (meaning none or very little rust) then this vehicle is a treasure worth preserving!!

Please provide some idea of vehicle condition and mileage/kilometres, preferably with pictures -- this is always helpful.

Please also re-read the 20-page AHC-TEMS "General Description", (found at the links within the second attachment to Post #4) especially the individual component descriptions and the AHC hydraulic circuit diagrams, so that we all can be "on the same page" when describing items in ongoing discussions.

Dealing first with the AHC Pump:

It is unclear what is meant by pump tests mentioned in Posts #5 and #7. The sound of rotation of the AHC Pump is not enough, probably just the noise of pump cavitation, so should be kept short -- tells only that the motor is capable of operating the Pump -- tells nothing about the Pump itself. The only worthwhile test to put the AHC Pump beyond doubt is to remove the discharge line (not simply crack open the connector), operate the Pump by direct connection with the battery (as done previously) and note the strength of flow (to be caught in a suitable container).

The flow from healthy AHC Pump is as shown below (Picture credit: @LX470YYC ). The AHC Pump is a positive displacement gear pump capable of developing the very high pressures found in the AHC/TEMS systems. If it is possible to hold back the flow with a gloved finger, then that of itself indicates unsatisfactory Pump (or Return Valve) condition and performance.

If the flow from AHC Pump appears as below (Picture credit: @LX470YYC ), it indicates that flow is impeded by partially blocked strainers -- there are two strainers in the Pump itself, one additional strainer in the Return Valve. Guidance can be given on what to do about this situation if flow and pressure is poor and certain to cause AHC/TEMS operating problems, and in particular, how to distinguish between strainer impediments in the AHC Pump versus strainer impediments in the Return Valve. This can be the subject of a separate Post, if requested.

A General Check-list:

As mentioned by very experienced long time IH8MUD Member @uHu, it is time to work through the AHC/TEMS system, with a Multi-meter in hand and with the DIagnostic section of the Factory Service Manual (FSM) printed out (found within the second attachment at Post #4), and with reference to the coloured AHC/TEMS Electrical Wiring Diagram (EWD) -- new attachment to this Post.

Key observations so far:

• Active Test is not working -- “S307-82 ecu cannot preform the requested active test”,
• Vehicle cannot be raised,
• Front and Rear are at different heights, so suspicions remain about Height Control Sensor Circuits (at least at Rear),
• AHC Pump rotates but internal conditions of Pump and Return Valve including respective strainers are unknown,
• No DTC codes are showing on Techstream -- check again after clearing ECU cache as described below in Steps (1) and (2),
• There may be more than one fault condition in the AHC/TEMS system,
• Suspect that there is no electrical power in AHC/TEMS circuits ****

Some of the list below may have been done already and the latter part of the list may be less relevant -- but all items are included here for completeness. The items highlighted in red font are likely to be the most relevant.

1. Re-boot vehicle and ECU by disconnecting and reconnecting battery,
2. Use the manual procedure to clear all DTC’s per FSM or per Page 2 of first attachment at Post #4 and observe any reappearance of faults,
3. Check no faulty door switches or faulty rear hatch switch are sending a ‘door open’ signal to ECU,
4. Check switch at brake pedal is working correctly, not sending lengthy ‘brakes are ‘on’’ signal to ECU,
5. If possible, check steering angle sensor is giving reasonable readings for steering straight ahead (<36 degrees),
6. Inspect physical condition of all Height Control Sensor circuits and test electrical condition of each Sensor circuit (Sensors + Connectors + Harnesses)per FSM – can easily have aberrant behaviour and/or ‘fail safe function’ (no AHC operation) even without appearance of DTC’s C1711, C1712, C1713,
7. Check power supply continuity at: ****
8. 50 Amp AHC fuse in Junction Box in engine bay,
9. 15 Amp AHC-B fuse in Junction Panel behind cowl forward of LHS Front Door,
10. 20 Amp AHC-IG fuse in Junction Panel behind cowl forward of LHS Front Door,
11. Check operation of AHC Relay in Junction Box in engine bay,
12. Check that connectors are tight at the Suspension Control (AHC) ECU under dashboard,
13. Check operation of AHC Main Relay attached to Suspension Control (AHC) ECU under dashboard ****
14. Check Power Source Circuit -- may require “Pre-check”, especially “Input Signal Check” per FSM Diagnostic section – or the equivalent method which utilises DLC1 found in first attachment at Post #4,
15. Visually check Connectors and all Harnesses for wiring breaks or damage, especially underbody near exhausts and near connector junctions -- may require review of correct voltages at ECU connectors per “Terminals of ECU” page at FSM and using attached EWD to establish which circuit(s) contain the problem(s), or, use access to AHC-related circuits at Junction Connector BI1 high up at chassis level behind Rear Quarter Panel -- see location pic below, track circuits using attached EWD,
16. Check Pressure Sensor is healthy per FSM method even if DTC C1718 is not reported,
17. Consider age of ‘globes’ and possibility of nitrogen from failing ‘globe’ membranes leading to gas accumulating in pump, aeration and pressure loss, possible cavitation,
18. Consider failed motor-pump seal or failed reservoir-pump seal leading to air entrainment into pump, aeration and pressure loss, possible cavitation,
19. Consider damaged or slipping ‘drive-shaft’ between AHC Pump and Motor,
20. Consider whole or partial blockage within AHC Pump at one or more of the two (2) internal strainers – (i) fluid intake strainer (most likely), or, (ii) secondary strainer above intake, either of which may lead to pressure abnormality recognised by Pressure Sensor and DTC1762,
21. Consider whole or partial blockage within the Return Valve strainer within the Return Valve which also could lead to pressure abnormality recognised by Pressure Sensor and DTC1762,
22. Consider over-tightened bolts attaching AHC Pump sub-assembly to the manifold carrying pump and motor on either side -- if too tight, may restrict pump rotation and limit fluid supply to AHC system,
23. Investigate wrongly oriented slot (or notch) at base of gear case within AHC Pump, also leading to low delivery pressure and flow recognised by Pressure Sensor and DTC C1762. The notch must face towards the inlet side (low pressure) side of the pump, not the discharge side (high pressure side) of the pump. [This is particularly relevant if AHC Pump has been dismantled or comes from a second-hand source and history is unconfirmed],

Please advise outcomes.

 

[Chris T]

Good to know @Chris T that a 2006 LC100 with AHC and 1HD-FTE turbodiesel is the subject of discussion. If underbody condition is good (meaning none or very little rust) then this vehicle is a treasure worth preserving!!

Please provide some idea of vehicle condition and mileage/kilometres, preferably with pictures -- this is always helpful.

Please also re-read the 20-page AHC-TEMS "General Description", (found at the links within the second attachment to Post #4) especially the individual component descriptions and the AHC hydraulic circuit diagrams, so that we all can be "on the same page" when describing items in ongoing discussions.

Dealing first with the AHC Pump:

It is unclear what is meant by pump tests mentioned in Posts #5 and #7. The sound of rotation of the AHC Pump is not enough, probably just the noise of pump cavitation, so should be kept short -- tells only that the motor is capable of operating the Pump -- tells nothing about the Pump itself. The only worthwhile test to put the AHC Pump beyond doubt is to remove the discharge line (not simply crack open the connector), operate the Pump by direct connection with the battery (as done previously) and note the strength of flow (to be caught in a suitable container).

The flow from healthy AHC Pump is as shown below (Picture credit: @LX470YYC ). The AHC Pump is a positive displacement gear pump capable of developing the very high pressures found in the AHC/TEMS systems. If it is possible to hold back the flow with a gloved finger, then that of itself indicates unsatisfactory Pump (or Return Valve) condition and performance.

View attachment 3985078

If the flow from AHC Pump appears as below (Picture credit: @LX470YYC ), it indicates that flow is impeded by partially blocked strainers -- there are two strainers in the Pump itself, one additional strainer in the Return Valve. Guidance can be given on what to do about this situation if flow and pressure is poor and certain to cause AHC/TEMS operating problems, and in particular, how to distinguish between strainer impediments in the AHC Pump versus strainer impediments in the Return Valve. This can be the subject of a separate Post, if requested.

View attachment 3985080


View attachment 3985093

A General Check-list:

As mentioned by very experienced long time IH8MUD Member @uHu, it is time to work through the AHC/TEMS system, with a Multi-meter in hand and with the DIagnostic section of the Factory Service Manual (FSM) printed out (found within the second attachment at Post #4), and with reference to the coloured AHC/TEMS Electrical Wiring Diagram (EWD) -- new attachment to this Post.

Key observations so far:

• Active Test is not working -- “S307-82 ecu cannot preform the requested active test”,
• Vehicle cannot be raised,
• Front and Rear are at different heights, so suspicions remain about Height Control Sensor Circuits (at least at Rear),
• AHC Pump rotates but internal conditions of Pump and Return Valve including respective strainers are unknown,
• No DTC codes are showing on Techstream -- check again after clearing ECU cache as described below in Steps (1) and (2),
• There may be more than one fault condition in the AHC/TEMS system,
• Suspect that there is no electrical power in AHC/TEMS circuits ****

Some of the list below may have been done already and the latter part of the list may be less relevant -- but all items are included here for completeness. The items highlighted in red font are likely to be the most relevant.

1. Re-boot vehicle and ECU by disconnecting and reconnecting battery,
2. Use the manual procedure to clear all DTC’s per FSM or per Page 2 of first attachment at Post #4 and observe any reappearance of faults,
3. Check no faulty door switches or faulty rear hatch switch are sending a ‘door open’ signal to ECU,
4. Check switch at brake pedal is working correctly, not sending lengthy ‘brakes are ‘on’’ signal to ECU,
5. If possible, check steering angle sensor is giving reasonable readings for steering straight ahead (<36 degrees),
6. Inspect physical condition of all Height Control Sensor circuits and test electrical condition of each Sensor circuit (Sensors + Connectors + Harnesses)per FSM – can easily have aberrant behaviour and/or ‘fail safe function’ (no AHC operation) even without appearance of DTC’s C1711, C1712, C1713,
7. Check power supply continuity at: ****
8. 50 Amp AHC fuse in Junction Box in engine bay,
9. 15 Amp AHC-B fuse in Junction Panel behind cowl forward of LHS Front Door,
10. 20 Amp AHC-IG fuse in Junction Panel behind cowl forward of LHS Front Door,
11. Check operation of AHC Relay in Junction Box in engine bay,
12. Check that connectors are tight at the Suspension Control (AHC) ECU under dashboard,
13. Check operation of AHC Main Relay attached to Suspension Control (AHC) ECU under dashboard ****
14. Check Power Source Circuit -- may require “Pre-check”, especially “Input Signal Check” per FSM Diagnostic section – or the equivalent method which utilises DLC1 found in first attachment at Post #4,
15. Visually check Connectors and all Harnesses for wiring breaks or damage, especially underbody near exhausts and near connector junctions -- may require review of correct voltages at ECU connectors per “Terminals of ECU” page at FSM and using attached EWD to establish which circuit(s) contain the problem(s), or, use access to AHC-related circuits at Junction Connector BI1 high up at chassis level behind Rear Quarter Panel -- see location pic below, track circuits using attached EWD,
16. Check Pressure Sensor is healthy per FSM method even if DTC C1718 is not reported,
17. Consider age of ‘globes’ and possibility of nitrogen from failing ‘globe’ membranes leading to gas accumulating in pump, aeration and pressure loss, possible cavitation,
18. Consider failed motor-pump seal or failed reservoir-pump seal leading to air entrainment into pump, aeration and pressure loss, possible cavitation,
19. Consider damaged or slipping ‘drive-shaft’ between AHC Pump and Motor,
20. Consider whole or partial blockage within AHC Pump at one or more of the two (2) internal strainers – (i) fluid intake strainer (most likely), or, (ii) secondary strainer above intake, either of which may lead to pressure abnormality recognised by Pressure Sensor and DTC1762,
21. Consider whole or partial blockage within the Return Valve strainer within the Return Valve which also could lead to pressure abnormality recognised by Pressure Sensor and DTC1762,
22. Consider over-tightened bolts attaching AHC Pump sub-assembly to the manifold carrying pump and motor on either side -- if too tight, may restrict pump rotation and limit fluid supply to AHC system,
23. Investigate wrongly oriented slot (or notch) at base of gear case within AHC Pump, also leading to low delivery pressure and flow recognised by Pressure Sensor and DTC C1762. The notch must face towards the inlet side (low pressure) side of the pump, not the discharge side (high pressure side) of the pump. [This is particularly relevant if AHC Pump has been dismantled or comes from a second-hand source and history is unconfirmed],

Please advise outcomes.

View attachment 3985164

View attachment 3985165

View attachment 3985171

View attachment 3985383


View attachment 3985483

1. Unplugged, left and replugged. Did nothing.
2. Cleared all the DTCs per FSM drove around a little no new codes.
3. Per the fsm signal check the door switches all read correctly
4. Brakes are seemingly good. ACC on, pumped the pedal a bunch and the buzzer buzzed. Anything else to check?
5. The steering sensor is sending tech stream readings in the teens, so good?
6. Checked all the cabling and physical elements including dissembling the rear ride height sensor, the rear sensor looks to be pretty much new it's in what looks to be really good shape.
7/8/9/10. all fuses are good, how would I go about testing the wires leading too and from?
11. AHC relay takes 12 volt fine and I get continuity when powered so works fine.
12. All plugs seem fully seated on the ecu
13. AHC main relay measure fine both open and closed per FSM
14. Pre check seems fine? Nothing but a fast blink. input test is seemingly more of the same if I've done it right
15. Visually fine. But haven't traced any wires yet.
16. Haven't checked the ECU side of the sensor but measures 4.6v at the sensor tested per FSM
17-23. I would think the pump if fine. I pulled the pressure line out completely and ran the pump it pushed a strong stream of fluid across the engine bay much like in your picture.

 

[IndroCruise]

1. Unplugged, left and replugged. Did nothing.
2. Cleared all the DTCs per FSM drove around a little no new codes.
3. Per the fsm signal check the door switches all read correctly
4. Brakes are seemingly good. ACC on, pumped the pedal a bunch and the buzzer buzzed. Anything else to check?
5. The steering sensor is sending tech stream readings in the teens, so good?
6. Checked all the cabling and physical elements including dissembling the rear ride height sensor, the rear sensor looks to be pretty much new it's in what looks to be really good shape.
7/8/9/10. all fuses are good, how would I go about testing the wires leading too and from?
11. AHC relay takes 12 volt fine and I get continuity when powered so works fine.
12. All plugs seem fully seated on the ecu
13. AHC main relay measure fine both open and closed per FSM
14. Pre check seems fine? Nothing but a fast blink. input test is seemingly more of the same if I've done it right
15. Visually fine. But haven't traced any wires yet.
16. Haven't checked the ECU side of the sensor but measures 4.6v at the sensor tested per FSM
17-23. I would think the pump if fine. I pulled the pressure line out completely and ran the pump it pushed a strong stream of fluid across the engine bay much like in your picture.

".... no new codes"??
After all of this very comprehensive work, could you please quote exactly what Diagnostic Trouble Codes (DTC's), or messages of any kind, which are appearing currently on Techstream or other devices? Then we can work from there .....

 

[Chris T]

".... no new codes"??
After all of this very comprehensive work, could you please quote exactly what Diagnostic Trouble Codes (DTC's), or messages of any kind, which are appearing currently on Techstream or other devices? Then we can work from there .....

I say no new codes as we cleared them all in one of the steps.
No codes have since been generated. Tech stream reports no issues at all.

 

[2001LC]

Just in case the easy stuff overlooked.

You did make sure, all doors closed and their switch working. One check is open a door, dash warning (door open) light appears. Door closed, warning light goes out. This indicates, CPU is reading doors switches properly.

With a flashlight behind reservoir, to aid in seeing level. Which helps, when staining in reservoir, gives false level indication. Make sure reservoir fluid level, is above max fill line. Start engine and let sit idling, with all door closed. If pump not running at this point. Force pump to run, via tech stream.

I've know Idea how a 1HD-FTE is configured. Is its AHC the same as 100 series Or more like the 200 series. In the 200 series, if we flush like a 100 series. The 200 AHC will go into failsafe. Pump will not run in failsafe. It's why Dealership, fear flushing 200 series. Very simple solution, to get out of failsafe. Force pump to run via tech stream. Once system detect pressure, it comes out of failsafe.

 

[IndroCruise]

I say no new codes as we cleared them all in one of the steps.
No codes have since been generated. Tech stream reports no issues at all.

Tagged @uHu, @2001LC, @Moridinbg, @suprarx7nut for advice -- or from anyone else with insights.

(Info for @2001LC: LC100 with AHC and 1HD-FTE is the same AHC system as on LC100 or on LX470 with 2UZ-FE -- @IndroCruise has RHD LC100 with AHC and 1HD-FTE in Australia, also @Moridinbg in Bulgaria and @uHu in Norway have similar vehicles but LHD in their cases).

So, circling back to Post #1 in this thread and in other separate Posts for this UK-based RHD 2006 LC100 with AHC and 1HD-FTE engine, where after replacing a 'shock absorber' and associated pipework, @Chris T described the following symptoms:

"there has previously been and error code for the rear ride height sensor. however i took that out and cleaned it. cleared the code on techstream and scanned a few times, it hasn't re appeared, so shouldn't be the issue?
the car refuses to pump to fill the new hose with fluid and bring itself back up to ride height. when i plug into techstream i get no error codes. when i try to run an active test it spits out the error "S307-82 ecu cannot preform the requested active test".
what could be causing this behavior?
ive tested all the fuses and relays they measure fine. what else should i be looking at/ any info on the specific error code?"

Further responses from @IndroCruise are set out below:

The Rear Height Control Sensor has been cleaned and inspected but not tested per item (6) in Post #8: "Inspect physical condition of all Height Control Sensor circuits and test electrical condition of each Sensor circuit (Sensors + Connectors + Harnesses)per FSM – can easily have aberrant behaviour and/or ‘fail safe function’ (no AHC operation) even without appearance of DTC’s C1711, C1712, C1713". Inspection and reliance on Height Control Sensor DTC's from Techstream are well known to be insufficient without testing -- especially on 19 years old Sensors -- for reasons explained in detail in multiple other Threads including Post #4 this thread -- so it is too early to remove this item from the list of suspects.

Following testing and clearances suggested in Post #8 with responses described in Posts #9 by @Chris T, many vital AHC components appear healthy, specifically:

• Check AHC Pump and Return Valve demonstrate strong flow on open circuit testing to atmoshere when operated directly from battery
• 50 Amp AHC fuse in Junction Box in engine bay
• 15 Amp AHC-B fuse in Junction Panel behind cowl forward of LHS Front Door
• 20 Amp AHC-IG fuse in Junction Panel behind cowl forward of LHS Front Door
• Check operation of AHC Relay in Junction Box in engine bay
• Check that connectors are tight at the Suspension Control (AHC) ECU under dashboard
• Check operation of AHC Main Relay attached to Suspension Control (AHC) ECU under dashboard
• Check Power Source Circuit -- may require “Pre-check”, especially “Input Signal Check” per FSM Diagnostic section – or the equivalent method which utilises DLC1 found in first attachment at Post #4
• Check Pressure Sensor -- only partially tested per FSM method
• Check Connectors and all Harnesses for wiring breaks or damage, especially underbody near exhausts and near connector junctions -- may require review of correct voltages at ECU connectors per “Terminals of ECU” page at FSM and using attached EWD to establish which circuit(s) contain problem(s), or, use access to AHC-related circuits at Junction Connector BI1 high up at chassis level behind Rear Quarter Panel to check continuity back to ECU or to an intermediate Connector Block -- see location pic below, track circuits using attached EWD. Preliminary visual inspection only, continuity testing yet to be undertaken by @Chris T

'Globe' age and condition have not been reported by @Chris T (test of difference between HI and LO heights at AHC Tank cannot be performed because vehicle will not raise) -- if original 2006 (~19 years old), 'globes' may be at low nitrogen pressures behind membranes and may be leaking nitrogen into AHC Fluid

Damping Force Control Actuator circuits have not been explored -- these do not appear relevant to the symptoms described.

Summary by @IndroCruise -- worried that I am missing something -- seeking wider advice:

The previous message -- "S307-82 ecu cannot preform the requested active test" -- has not reappeared on Techstream.

No DTC's are showing on Techstream per Post #11 by @Chris T -- in particular, DTC's C1751 and C1762 have not appeared.

"Active Test" continues NOT to work from Techstream NOR from bridging terminals in DLC1 nor DLC3 -- appears to be prohibited either by

• faulty Rear Height Control Sensor -- as described above and elsewhere, OR
• some other fault which has not yet been identified -- seems possible, such as from large air ingress after previous replacement of 'shock absorber' and pipework and/or by nitrogen in AHC Fluid -- but if so, why does DTC C1762 not appear? OR
• by lack of power to ECU which is preventing operation of AHC, maybe caused by damaged/broken wire(s) -- seems possible, not yet really explored, OR
• by failed ECU -- seems unlikely in a 'young' 2006 vehicle??

 

[IndroCruise]

7/8/9/10. all fuses are good, how would I go about testing the wires leading too and from?
11. AHC relay takes 12 volt fine and I get continuity when powered so works fine.

As an aside, the observation posted long ago by @PADDO may be worth a try:
AHC DTC C1743 - main relay - https://forum.ih8mud.com/threads/ahc-dtc-c1743-main-relay.914138/#post-10245382

Beyond that, if items discussed in Posts #9 and #13 in this thread are all good, along with the easy-to-overlook items mentioned by @2001LC in Post #12 in this thread, then it may be time to test for loss of continuity or shorts in the relevant harness wiring causing loss of power or conflicting signals being received by the Suspension ECU or the adjacent AHC Main Relay. If either happens, then that would be sufficient to prevent operation of the AHC/TEMS systems and the Active Test would not work either.

The attached Wiring Harness Repair Manual in Section A gives useful "how to test" methods using a multi-meter -- so no point in writing this out again.

The next issue is what and where to test? Some suggestions follow ....

It is helpful to start with a review of the relevant Electrical Wiring Diagrams (EWD's). To that end, it is best to read the following links in order, leading eventually to specific information for a RHD LC100 Model Year 2006 (covered by the designations 2004/8 and onwards, and 2005/5 and onwards, in the later links):

The "Introduction" and "how to use this manual" links describe the conventions used by Toyota/Lexus in the following two separate links:

INTRODUCTION | Electrical Wiring Diagram | LC100 Factory Service Ma...

Comprehensive information on INTRODUCTION in the Electrical Wiring Diagram section for the LC100 service manual.

lc100e.github.io

HOW TO USE THIS MANUAL | Electrical Wiring Diagram | LC100 Factory ...

Comprehensive information on HOW TO USE THIS MANUAL in the Electrical Wiring Diagram section for the LC100 service manual.

lc100e.github.io

Then look at the "Electrical Wiring Routing by Parts" and also separately "Electrical Wiring Routing by w/w (Wire Harness-to-Wire Harness), Ground Point (g/p), (s/p) "

Liftgate Type ( 2004.8 - ) | Electrical Wiring Diagram | ELECTRICAL...

Comprehensive information on Liftgate Type ( 2004.8 - ) in the Electrical Wiring Diagram ELECTRICAL WIRING ROUTING [Parts] RHD:Body section for the LC100 ser...

lc100e.github.io

Liftgate Type ( 2004.8 - ) | Electrical Wiring Diagram | ELECTRICAL...

Comprehensive information on Liftgate Type ( 2004.8 - ) in the Electrical Wiring Diagram ELECTRICAL WIRING ROUTING [W/W, G/P, S/P] RHD:Body section for the L...

lc100e.github.io

Then scroll down to the
"Overall Electrical Wiring Diagrams for RHD Active Height Control Suspension 2004/8 onwards"
and separately
"Overall Electrical Wiring Diagrams for RHD Adaptive Variable Suspension 2004/8 onwards"

2004.8 - | Electrical Wiring Diagram | OVERALL ELECTRICAL WIRING DI...

Comprehensive information on 2004.8 - in the Electrical Wiring Diagram OVERALL ELECTRICAL WIRING DIAGRAM [RHD] Active Height Control Suspension section for t...

lc100e.github.io

2004.8 - | Electrical Wiring Diagram | OVERALL ELECTRICAL WIRING DI...

Comprehensive information on 2004.8 - in the Electrical Wiring Diagram OVERALL ELECTRICAL WIRING DIAGRAM [RHD] Adaptive Variable Suspension section for the L...

lc100e.github.io

Finally, scroll dowm to "Electrical Wiring Diagram Supplement - from May 2005",

GSIC - Global Service Information Center

lc100e.github.io

Select "Suspension and Axle",
Select "Active Height Control Suspension and Adaptive Variable Suspension (RHD)"

These references relate the ....

• Electrical Wiring Diagrams for AHC and TEMS (AVS) for a 2006 LC100 with AHC, and,
• the 'maps' of the physical locations of the relay and junction or connector locations,

.... using the various codings and numbering system explained in the "how to use this manual" link given above.

Sadly, none of these references are in colour -- and there are some minor differences from the 'color EWD' attached to Post #8 in this thread which I think comes from a 2005 LHD LX470 FSM. The differences are not really significant, but are just enough to cause confusion! Suggest stick to the RHD references given in this Post. I still use a hardcopy 'printed and stitched together version' the 'color EWD' mentioned in Post #8 to help me follow the 'circuit logic', even though I know that it relates to a LHD vehicle and some of the position indications are different to an RHD vehicle.

Staying with the RHD 2006 LC100 with AHC, the last reference gives relevant information:

GSIC - Global Service Information Center

lc100e.github.io

Note that on arrival at this link, it is possible to toggle between "Connector List" and "Location". It takes a bit of exploration by moving between the EWD and these lists and diagrams to learn where each relevant item or junction actually is located and to understand how it fits into the circuit. Maybe a handy Auto Electrician can assist??

By way of example, the pics below relate to access to the AHC circuits at the BI1 (Bravo India One) connector. As can be discerned from the EWD, this is a useful place to gain access to, and test, a range of AHC/TEMS circuits which all pass through this connector. BI1 (and also (BI2) are located at the Left Hand Rear of the vehicle, behind the Quarter Panel, approximately at chassis level. It can be reached from below. Maybe it can be reached from above but I have never tried this.

By opening BI1 and connecting a multi-meter here and at a another open connector nearer to the ECU, the "how to test" procedures in the attached Wiring Harness Repair Manual in Section A gives methods for testing for continuity and short circuits in that portion of the circuit and also whether there is the expected voltage potential where it is expected on the incoming side of the connector.

This also is an opportunity to test whether the Ground Point connections are good, especially if there is rust under the vehicle. Good connections to Ground are just as important as any other part of any circuit.

Obviously, first it is best to have a good look around under the vehicle with a powerful light, preferably when the vehicle is on a hoist, to try and discover areas of suspect damage, or to check connectors and wire entries into connectors which may have been damaged by materials thrown up during travel, or parts of the harness which may have been damaged from heat from exhausts, or from water ingress.

Some experiences reported in the following links to well-illustrated Posts illustrate what can happen ....

Suggest read the whole of this thread:
AHC done? - https://forum.ih8mud.com/threads/ahc-done.1299423/#post-14710390

If not already done, suggest cruise the thread below from about Post #250 to Post #260. The discussion between @suprarx7nut, @2001LC and @Moridinbg may be helpful. There are a lot of excellent pictures and explanations in these posts which help to identify the connectors and harness parts under discussion – particularly the “body off” pics provided by @Moridinbg and the later comments in the same thread by @2001LC:
The ABCs of AHC - How to Measure, Flush, and Adjust all in one place - https://forum.ih8mud.com/threads/the-abcs-of-ahc-how-to-measure-flush-and-adjust-all-in-one-place.1211999/page-13#post-14466603

Hopefully some of this helps!!

'Stitched together version' of the 'color EWD' mentioned in Post #8, helps to follow the 'circuit logic', even though it relates to a LHD vehicle and some of the connectorbpositions are on slightly different in a RHD vehicle.