Yes -- the link has been updated today at Post #7 this thread (the originator removed the word "manual" from the link address). Thanks for the heads-up.
Try this:
Comprehensive information on HOME in the manual for the LC100 service manual.
lc100e.github.io
Also, see below some notes which were prepared for others and which may be of assistance ....
The link is for a Toyota LC100 resource published by Toyota Motor Corporation but it applies also to much of the Lexus LX470 "below the skin" (excluding some of the accessories and related electrics and different body details).
The AHC/TEMS systems are the same for LX470 and LC100 (where fitted).
It is always a good idea to cross-level the Front of the vehicle using a tape-measure and the torsion bar adjusters with engine OFF before commencing other AHC/TEMS work. See first attachment. (Front cross-levelling is
not done with Techstream and Height Control Sensor readings).
In addition, it is helpful to check first the condition of the 'globes' as a whole -- this gives a base-line for later comparisons. See second attachment.
The indexing of the linked site is a bit clunky and difficult to search -- but it does work:
An illustrated
General Description of AHC and TEMS can be found by following the tabs mentioned within the link below. This 20 page item is well-illustrated with diagrams and explanations of the function of each of the components in the AHC/TEMS system.
It is good basic pre-reading and helps give a ‘mental picture’ of how these systems work. There is no diagnostic nor repair information in this section.
As a starting point, go to:
LC100 Workshop Manual - https://lc100e.github.io/
then use tabs at LHS of opening page
+ New Car Features
+ CHASSIS
+ Suspension
+ Active Height Control Suspension and Skyhook TEMS
Moving beyond the General Description .....
AHC and TEMS Diagnostics information is found here -- but Techstream is necessary to go beyond physical symptoms:
Go to:
LC100 Workshop Manual - https://lc100e.github.io/
then use tabs at LHS of opening page
+ Repair Manual
+ DIAGNOSTICS
+ ACTIVE HEIGHT CONTROL SUSPENSION & SKYHOOK TEMS
Repair and Specification Details are found here:
Go to:
LC100 Workshop Manual - https://lc100e.github.io/
then use tabs at LHS of opening page
+ Repair Manual
+ SUSPENSION AND AXLE
This section covers all non-AHC mechanical aspects of the suspension and axle arrangements.
Scrolling down further within this SUSPENSION AND AXLE section reveals the AHC repair and specification information:
+ ACTIVE HEIGHT CONTROL SYSTEM (Independent Front Suspension)
+ ACTIVE HEIGHT CONTROL PUMP & MOTOR (Independent Front Suspension)
+ CONTROL VALVE ASSEMBLY (Independent Front Suspension)
+ HEIGHT CONTROL ACCUMULATOR (Independent Front Suspension)
+ PUMP ATTENUATOR (Independent Front Suspension)
+ DAMPING FORCE CONTROL ACTUATOR (Independent Front Suspension)
+ HEIGHT CONTROL SENSOR (Independent Front Suspension)
The following IH8MUD links are worthwhile starting points on AHC/TEMS matters:
https://forum.ih8mud.com/threads/the-abcs-of-ahc-how-to-measure-flush-and-adjust-all-in-one-place.1211999/#post-13116520
This is a long thread but just start at the beginning and continue until it becomes a bit repetitive. Along the way at Post #5 in this thread, see the excellent video and "cheat sheet" about adjusting AHC pressures -- prepared and published by
@suprarx7nut .
Front AHC pressures usually can be managed with the torsion bar adjusters -- but cross-level first per the first attachment. Unlike a conventional suspension, the torsion bar adjusters have just two purposes on an AHC-equipped vehicle:
1. cross-levelling the Front of the vehicle, meaning equalising the hub-to-fender heights using tape measure, not Techstream -- this is an essential first step when doing any AHC adjustments and 'fine tuning', and,
2. adjust load share between Front torsion bars and Front AHC system (unlike a conventional suspension the so-called 'shock absorbers' are merely hydraulic struts used to carry part of the mass of the vehicle, and, enable ride height adjustment in conjunction with the Height Control Sensors, the Control Valve Assembly, the AHC Pump and the Electronic Control Unit,
'Ride Height' is set at "N" height using the adjusters at the Height Control Sensors (
not the torsion bar adjusters).
There is no easy provision for adjusting Rear AHC pressures -- usually it boils down to adding spacers or using springs with a higher spring rate. Australian-made KING KTRS-79 work well at the Rear. Some folks add or substitute airbags inside the rear coils. Others with VERY heavy vehicles or loads have used standard (non-AHC) Land Cruiser Rear coils. The airbags provide a flexible approach for different load conditions but may be over-kill if used in addition to higher spring rate springs. Gross Vehicle Mass (GVM) or Gross Vehicle Weight Rating (GVWR) may need to be monitored along with axle loadings -- policing of vehicle weights and loadings is enforced more strictly in some jurisdictions than others.
Note that an increased 'ride height' of the vehicle can be set at "N" height using the Height Control Sensor adjusters (the so-called "Sensor Lift") but this will mean that springs and torsion bars then are extended and will carry less weight, so the AHC system carries more weight, meaning that AHC pressures increase and must be compensated to bring them back within the FSM-specified range.
A good wiring diagram can be found here -- it is for LX470 and there will be some differences due to accessories, different engines, different models and years, LHD versus RHD -- but it is handy for AHC/TEMS purposes:
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-21#post-14909889
A few more useful links:
Parts Catalogue -- good to identify Part Numbers -- use own VIN at:
Parts catalog for Toyota Land Cruiser - https://toyota-general.epc-data.com/land_cruiser/
Harness and Connectors
https://www.toyota-tech.eu/wire_harness_rm/RM06H0E.pdf
That should be enough to get started. Hope all goes well!!
