LR3 Suspension Help

[GORM]

After a great day of off roading Saturday at Rausch at the Rovers on the Rocks I got a suspension fault. Other threads seem to not be the exact conditions so I thought I would detail out what I have besides no Gap tool :Wow1so that is rapidly rising on the list). The faults clear after I restart the rover and I can replicate the faults.

After starting rover, Compressor comes on, I can adjust height as normal (drop to access height and then go to normal or even off road mode). Though the rover starts at standard height, the 4x4 screen shows the green bar below the line and I must raise to get to normal height.

I then drive normally and after about about 5 minutes or a few miles I will get the audible alarm with HDC System Fault (w/ amber triangle dsc symbol) then Special Programs Fault (w/ amber trick with curved arrows) and then the system saying "Suspension Lowering". Rover will drive at highway speeds as these are only warnings but I obviously cannot use the special programs or change height at all until I turn off the truck. I did perform a hard reset (removed battery cables and connected battery cables together for maybe 20 minutes while doing other stuff).

Other important stuff: I have new compressor in the last 6 months with multiple off roading trips since the new compressor, battery is less than 2 years old and running at 13.9 volts pretty consistently and I checked multiple fuses in passenger and engine compartment having to do with suspension and found nothing.

I did not get the Normal height only message.

Any help/ input would be greatly appreciated.

Kent

 

[zelatore]

>Though the rover starts at standard height, the 4x4 screen shows the green bar below the line and I must raise to get to normal height.

Without a GAP tool to pull codes it's really just guessing, but I think this sentence is key. It sounds like the truck is at standard height at start-up but the computer thinks it's lower based on the wheel height sensor(s?) on the display - correct? If so, I'm going to suspect a height sensor or the wiring to it.

I won't be able to follow up on here a lot over the next couple days but if you can give any more details about the display and start-up that may help us zero in.

Annoyingly, all 4 corners have a different PN for the sensors so you can't just carry one as a spare. At least they are small and not too expensive and easy to change.

 

[jymmiejamz]

My guess without seeing any fault codes would be a brake light switch. Paying someone to properly diagnose the problem is cheaper than guessing.

 

[GORM]

So here is pic of 4x4 screen upon startup:



This is after raising to normal height.



Jymmiejamz, I'll check out brake switch ... this is something that must be fixed so if after a couple attempts I cannot diagnose, I clearly need codes.

 

[jymmiejamz]

So here is pic of 4x4 screen upon startup:

View attachment 374853View attachment 374853

This is after raising to normal height.

View attachment 374854

Jymmiejamz, I'll check out brake switch ... this is something that must be fixed so if after a couple attempts I cannot diagnose, I clearly need codes.

Are those pictures while it is actually faulting?

A couple of attempts of misdiagnosis could be more than paying someone to diagnose it. It could be as simple as an incorrect or bad brake light bulb.

 

[GORM]

Those pics were both PRIOR TO FAULTING. It will reset after turning off ignition. After faulting, the screen looks like the top one (green line slightly below the orange dots).

More info, my right rear is a bit off camber and I suspect I may have a mechanical problem contributing to this issue. Even when truck is level it seems not aligned properly. Truck does not have a wobble or vibration but feels like it needs an alignment. I'm taking to my mechanic and will report back with findings.

It would be lofty thought to find brake light switch is causing this now! :Mechanic:

 

[ColoDisco]

Your description is confusing. Does your truck start off lowered? Or after you adjust it to access then to normal it shows below standard height?

 

[GORM]

After I shut off the ignition after the faults are active the entire system resets itself.

When I restart the rover, the truck is lower than standard, 4x4 screen reads STANDARD and the green line is just lower than normal. That is the first pic. This is not access and not standard. The compressor will come on, I can raise or lower the rover. When I raise, it raises to standard height ... but it was already there! Once I raise, then the green line will be even (2nd pic).

I can get a few miles before the faults kick in and lower the vehicle. It has nothing to do with speed, I can hit the highway and get going 60mph or drive in a straight line under 30; the faults still kick on after a few minutes. It does not seem to kick in if I idle for long period of time.

After the fault, the 4x4 screen shows the line really low and the minus signs on top are flashing red. (Pic not shown)

Anyway, I have appointment tomorrow with mechanic to read codes so I will share the results.

 

[ColoDisco]

After you start the vehicle does it try and self correct the height? Or do you have to hit the switch?

 

[GORM]

Rover will not reset itself when turned on but will after the truck is moving.

*** UPDATE *** - I got codes from my mechanic
C1B00 Steering Angle Sensor
U0132 - I think thisis Lost communication from ride control module
U0402 - Invalid data rec'd from transmission control module

My mechanic re-calibrated the steering angle sensor but this had no affect once the truck was turned off and started moving again. Steering wheel is not straight and all sensors go off exactly as they did before, after a few minutes/miles of driving as described above.

Thanks

 

[jymmiejamz]

So your steering wheel is not straight, but your mechanic calibrated your steering angle sensor? That can cause event more problems unless he calibrated it with it in the position it would be when you are driving straight.

 

[GORM]

Steering wheel was straight, I believe that the steering angle sensor was not the real problem. It was no different after that "adjustment". I've purchased a brake light switch, $38 that cannot hurt regardless of whether that it the root cause. My rover has 100k on it.

I was off roading, so I guess I am expecting something more physical than electrical. I even crawled under to see if I damaged the speed sensor wire in the driver front wheel well but found it intact and undamaged. There was a lot of water/ mud I had to deal with.

Any other suggestions should this not fix the problem based on codes?

Will report back, AB usually gets to my house within 2 days.

Thanks
Kent

 

[ColoDisco]

What I am wondering is weather you have a suspension issue or a general electrical issue. With signal loss it might be worth tracking down why you are getting invalid data faults. Could be height sensors.

 

[jymmiejamz]

What I am wondering is weather you have a suspension issue or a general electrical issue. With signal loss it might be worth tracking down why you are getting invalid data faults. Could be height sensors.

I'm not sure how you came to the conclusion a height sensor could be causing a module communications fault. A faulty height sensor would likely set a fault for one or more height sensors, not module communications faults.

Moving on... A full list of the fault codes stored in all modules is pretty essential. If I had to guess, your mechanic (assuming you took it to an independent shop) only checked for fault cods in the ABS control module. You probably do in fact a a bad steering angle sensor or a wiring issue to the steering angle sensor.

 

[spikemd]

If you were slogging through mud, pressure wash underneath and around each wheel. A sensor could have been buggered up or giving intermittent readings, though they would usually show up as code faults. Is the compressor constantly running or does it shut off after it reaches standard height?