L322 2005 td6 height/abs woes on front left

HI,

I am having issues with a L322 I got pretty cheap. 4th one in the family and have been able to fix all maner of issues with these cars but this one has my stumped. Its a 2005 L322 td6 with the updated touchscreen sat nav.

If I reset every fault code in the car everything is great other than being obviously not pumped up flat, untill 30-35ish mph. Below that I can drive around endlessly without issue including offroad mode/hooking up trailers and general farm type stuff.

However once I hit the magic speed the air suspension turns it self off, doesnt drop down but just turns off and gives me a error on the dash. This gives me this fault.



I *think* it also gives me this fault in the abs ecu at the same time but cant confirm.




This fault is annoying but as the car never drops/changes height I just ignore it. If I hit a pothole/bump in the road with the front left wheel I get the trio of yellow warning lights for abs/dsc etc come up and stay on till I next turn the car off. This led me to think the abs sensor on that corner is going funky so I replaced it with a new pattern part. Plugged it all in, went to drive it and it kept locking and unlocking that wheel with the abs light flashing like mad at only 3-5 mph or so. Going to try get a known good one out of the other cars without breaking it to test. Last few days it has flickered the fault at me and pulsed the brake pedal when doing low speed turns while braking which is slightly more worrying as its on the old sensor still.


But back to the air suspension fault as the above fixes as soon as you turn the car off.

I have a fault reader + old dealer software on a laptop which I have been able to use to fix all sorts of issues but never seen things like this.

To start with the car in normal driving mode these are the heights/voltages I am getting, ground isnt perfectly level but its not this bad. Also I know front left is down, thats not its leaked down it just always sits at that level.






Then I put it into offroad mode - goes up as fast as any of the others we have.







Only other fault I get is the outside temp sensor is reading -40 and sometimes raises to -20ish flickers about and goes back to -40, tried a new sensor and nothing changed.

Any insight would be greatly welcomed.

SlowRs said:

HI,

I am having issues with a L322 I got pretty cheap. 4th one in the family and have been able to fix all maner of issues with these cars but this one has my stumped. Its a 2005 L322 td6 with the updated touchscreen sat nav.

If I reset every fault code in the car everything is great other than being obviously not pumped up flat, untill 30-35ish mph. Below that I can drive around endlessly without issue including offroad mode/hooking up trailers and general farm type stuff.

However once I hit the magic speed the air suspension turns it self off, doesnt drop down but just turns off and gives me a error on the dash. This gives me this fault.

I *think* it also gives me this fault in the abs ecu at the same time but cant confirm.

This fault is annoying but as the car never drops/changes height I just ignore it. If I hit a pothole/bump in the road with the front left wheel I get the trio of yellow warning lights for abs/dsc etc come up and stay on till I next turn the car off. This led me to think the abs sensor on that corner is going funky so I replaced it with a new pattern part. Plugged it all in, went to drive it and it kept locking and unlocking that wheel with the abs light flashing like mad at only 3-5 mph or so. Going to try get a known good one out of the other cars without breaking it to test. Last few days it has flickered the fault at me and pulsed the brake pedal when doing low speed turns while braking which is slightly more worrying as its on the old sensor still.


But back to the air suspension fault as the above fixes as soon as you turn the car off.

I have a fault reader + old dealer software on a laptop which I have been able to use to fix all sorts of issues but never seen things like this.

To start with the car in normal driving mode these are the heights/voltages I am getting, ground isnt perfectly level but its not this bad. Also I know front left is down, thats not its leaked down it just always sits at that level.

Then I put it into offroad mode - goes up as fast as any of the others we have.

Only other fault I get is the outside temp sensor is reading -40 and sometimes raises to -20ish flickers about and goes back to -40, tried a new sensor and nothing changed.

Any insight would be greatly welcomed.

Click to expand...

The front left sensor voltage of between 29 and 43 volts is clearly wrong, those are impossible voltages and indicate either a duff sensor or an open circuit. Have you tried to check the calibration?
The ABS fault could be a wheel bearing.

I know it is wrong. I have tried new/known good sensors, checked the plug, chased the wires till they disapear from sight and cant find anything.

Unsure about the calibration, how would I go about doing this?

How would a wheel bearing cause 2 different sensors to have different problems unless you think my current one is dead?

SlowRs said:

I know it is wrong. I have tried new/known good sensors, checked the plug, chased the wires till they disapear from sight and cant find anything.

Unsure about the calibration, how would I go about doing this?

How would a wheel bearing cause 2 different sensors to have different problems unless you think my current one is dead?

Click to expand...

Have you checked for corrosion in the sensor connectors?
As everything on the L322 is interconnected, one faulty system can cause problems with other systems.
The wheel bearing would only affect the ABS.

I had a look and didnt see anything, I could always cut a connector off the parts car but didnt think that could be the issue.

Sorry in regards to wheel bearing I meant would that not have the same issues across both abs sensors (new and old) instead of new one locking up the brakes and old one not locking them up.

SlowRs said:

I had a look and didnt see anything, I could always cut a connector off the parts car but didnt think that could be the issue.

Sorry in regards to wheel bearing I meant would that not have the same issues across both abs sensors (new and old) instead of new one locking up the brakes and old one not locking them up.

Click to expand...

There are a lot of duff ABS sensors on the market.
Saint V8 in another thread confirms that the EAS uses data from the ABS sensors, so the faults are probably linked. ABS sensor wires have been known to chafe on the metalwork.

Another member had an issue like this and it was the sensor arm on the wrong way around.
Put it on correctly and problem solved.
I think the arm can "over-centre" and then your sensor will be reading inverted effectively.
Not sure exactly how this looks or happens but I'd take a look at both front sensors and make sure they are mirror image of each other.
Also, the swivel joints on the sensors can seize up and give articulation faults.
Not sure if that will help but worth a look.

Yeh I thought this at first, looked at one of our other Range Rovers and it all matched up, 3 sensors tried including one in the exact same angle it came off a working car to test.

Regarding the abs sensor do you think its worth trying a used one or just buy another new one? The one I got was actually a different colour connector but assumed that was just the third party choice.

SlowRs said:

Yeh I thought this at first, looked at one of our other Range Rovers and it all matched up, 3 sensors tried including one in the exact same angle it came off a working car to test.

Regarding the abs sensor do you think its worth trying a used one or just buy another new one? The one I got was actually a different colour connector but assumed that was just the third party choice.

Click to expand...

From other posts, it seems that only OEM sensors work.