AHC Error code S307-82 (3 Viewers)

[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 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) expecially 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 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.

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 printed out (found within the second attachment at Post #4), and with reference to the 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 condition of Pump and Return Valve including respective strainers are unknown,
• No DTC codes are showing on Techstream,
• 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 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. Check Connector or wiring harness break – may require review of correct voltages at ECU connectors per “Terminals of ECU” page at FSM to establish which circuit contains the problem,
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.