L322 AIR SUSPENSION FAULT

[Off Duty Dad]

PLEASE HELP... Tearing my hair out... Initial leaking front left suspension airbag replaced as was the height sensor. Levelling issues continued and while in the garage the compressor gave up apparently so that was replaced too. Car given back to me and on the way home the air suspension fault light came on yet again. My code reader initially said front right sensor fault so I cleared that and booked it back in garage, they cleaned the sensor and on the way home the warning light came back on. This time it was "articulation invalid" so I checked all 4 height sensors. 3 were showing voltages between 1.5-2.5v and the front left was showing over 45v. Back in garage for what appeared to be a faulty sensor which they replaced today. Driving car home and warning light is showing yet again shortly after leaving garage. Checked voltages and the same front left sensor is once again over 45v. AARGH... Any ideas PLEASE ??
Could change garage but I could be paying again for something that the original garage is doing wrong!! Thanks

 

[joey]

couple questions, what color is the dash light? Any other dash lights? Did the garage you took it to normally work on Rovers? Do they have the Autologic/rovacom/T4?

 

[Off Duty Dad]

It's a 2002 UK RHD. Garage is a Land Rover only specialist (that's all they do all day long). I found the voltage readings using my iCarsoft i930 Scanner. Not sure what the garage are using but it's about the size of a laptop screen with heavy duty rubberised edges. I see a scripted warning "air susp. inactive" under the dials together with a loss of the height level switch LED's and obviously won't change heights (up or down). The garage has commented that it's difficult for them to calibrate the levels because the cars running on 22" wheels. Every time the car comes back it still seems higher than it previously did before the first problem.
Thanks for your time.

 

[joey]

Sadly if they don't get the level correct on all 4 corners within 3mm it will cause the rover to go into fault. I know the 2002 didn't come with 22's, do you have another set of tires you can use for them to get it into sync?

 

[Off Duty Dad]

Sadly no other wheels but will tell them although I'd have hoped they were already aware.
Maybe they can source some from another motor in their care.
Why would one height sensor have such a high voltage reading compared to the other 3 ?

 

[joey]

Normally the sensors don't go bad, the issues with the full sized Rangie will be something else causing the issues.

 

[Off Duty Dad]

OK, thanks Joey... Will have to go back to garage for yet another look.
Thanks for your time, much appreciated......
If anyone can recommend a LR garage in/around East London or Essex borders I may try them instead.
Open to suggestions other than that.
Thanks

 

[Jeremy Buckingham]

Did you ever find the problem ? I have the exact same issue . LF is reading 44-49 Volts and the car is kind of teetering on the RF and LR . ABS and traction control are working and easy to engage unless you drive very gently

 

[Lakeranger]

I too am having suspension issues with my 07 L322 S/C. I've had issues at various times and have always been able to fix them, many times through this forum or others. My latest is a Suspension Fault warning that has progressed into many additional faults, including turning off the Terrain features (all 4X4 systems). But the air suspension holds and vehlcle doesn't drop unless using the manual feature of the GapII tool.
See faults below:
Before Fault Clearing:

VIN SALMF13427A23XXXX
Model L322 - Range Rover 2007
Vehicle scanned on Feb 28, 2020 13:07:23
IIDControl 2.9.9.7 Build 71 Android - IIDTool BT V3.0 B2643

ATCM-Terrain Response

U0401-94 (2C) Invalid data received from engine control module/powertrain control module - Component failure - unexpected operation
( on 28-02-2020 08:30:23 at 222276 mi )

U0402-94 (2C) Invalid data received from transmission control module - Component failure - unexpected operation
( on 28-02-2020 08:30:23 at 222276 mi )

U0416-94 (2C) Invalid data received from vehicle dynamics control module - Component failure - unexpected operation
( on 28-02-2020 08:30:23 at 222276 mi )

U0403-94 (2C) Invalid data received from transfer case control module - Component failure - unexpected operation
( on 28-02-2020 08:30:23 at 222276 mi )

U0421-94 (2C) Invalid data received from ride level control module - Component failure - unexpected operation
( on 28-02-2020 08:30:21 at 222276 mi )

IPC-Instrument Pack

U0248-87 (2F) Lost communication with remote driver utility module - Bus signal/message failure - missing a message
( on 27-02-2020 17:24:45 at 222276 mi )

RLM-Suspension

C1A13-64 (28) Pressure does not decrease when venting gallery - Algorithm based failure - signal plausibility failure
( on 28-02-2020 10:44:20 at 222298 mi )

C1131-92 (6C) Air supply - Component failure - performance or incorrect operation
( on 28-02-2020 08:30:21 at 222276 mi )

VIM-Immobilizer

B1B01-87 (2E) Key transponder - Bus signal/message failure - missing a message
( on 28-02-2020 08:29:30 at 222276 mi )

U0155-87 (28) Lost communication with instrument cluster control module - Bus signal/message failure - missing a message
( on 28-02-2020 09:03:15 at 222298 mi )

After clearing all faults, restarting engine and enabling suspension (via Gap II), a message appears to raise or lower suspension to activate. Then the vehicle became stuck in "Extended Mode" and will not go up or down. Currently sitting at a slightly elevated position. By resetting the ECM's by shorting battery leads the system will again go into the "Suspension Fault" and turn off the Terrain Response and Suspension systems.

These are the current faults after Clearing and Operating Suspension Down:

VIN SALMF13427A23XXXX
Model L322 - Range Rover 2007
Vehicle scanned on Feb 28, 2020 13:09:43
IIDControl 2.9.9.7 Build 71 Android - IIDTool BT V3.0 B2643

ATCM-Terrain Response

U0401-94 (2E) Invalid data received from engine control module/powertrain control module - Component failure - unexpected operation
( on 28-02-2020 13:09:01 at 222327 mi )

U0402-94 (2E) Invalid data received from transmission control module - Component failure - unexpected operation
( on 28-02-2020 13:09:01 at 222327 mi )

U0416-94 (2E) Invalid data received from vehicle dynamics control module - Component failure - unexpected operation
( on 28-02-2020 13:09:01 at 222327 mi )

U0403-94 (2E) Invalid data received from transfer case control module - Component failure - unexpected operation
( on 28-02-2020 13:09:01 at 222327 mi )

U0421-94 (2F) Invalid data received from ride level control module - Component failure - unexpected operation
( on 28-02-2020 13:08:59 at 222327 mi )

IPC-Instrument Pack

U0248-87 (2F) Lost communication with remote driver utility module - Bus signal/message failure - missing a message
( on 28-02-2020 13:08:01 at 222327 mi )

RLM-Suspension

C1A13-64 (AF) Pressure does not decrease when venting gallery - Algorithm based failure - signal plausibility failure
( on 28-02-2020 13:08:59 at 222327 mi )

Looking for some assistance in trouble shooting with the Gap II tool. I'm sure it's a suspension valve issue but which valve. I replaced the seals on the exhaust valve hoping this would solve this issue. Some time ago I also drilled a hole in the exhaust silencer and replaced the dissicant, which cleared suspension faults at that time.

 

[Lakeranger]

Follow up: still have the issues. I notice now while monitoring the cross link valves, exhaust valve, reservoir valve and gallery pressure, that when engine is first started after sitting overnight that the reservoir valve opens 100% and compressor comes on. The pressure rises to about 225psi, then reservoir valve closes and the compressor stops. Immediately the exhaust valve opens and dumps air to about 70psi then that valve closes. The 70psi holds but it's not enough to raise the suspension, not even one corner via the Gap tool. Any ideas on what is causing this loss of air pressure? I cannot find any leaks at valves or compressor. Could it be the EAS ECU?