suspension in extended mode and Suspension failure

Stev said:

I'm at the end! So my findings: I swapped the wires, moved the arm and looked at the live values. As expected, the arm finally gave different height values. I thought that the problem was finally solved. After calibration I wanted to save the data and the error e0 came up. After 2 hours I remember the limit values that the height sensor outputs (see Figure 1). I then looked at the live values and realized that my new right height sensor had a value of 366 (the limit is 250 see Figure 2). The height sensor, although it works) gives too high a value and that's why I can't complete the calibration. I then tried swapping all the wires with each other. It worked but no longer gave altitude values or it was not recognized. I do not know how to continue.....

View attachment 315218View attachment 315217

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Only the ) volt and +5 volt wires can be swapped, the third wire has to be on the correct pin or there will be no change in the values as the arm moves.

This may sound silly, But.

The hard plastic rod down to the suspension arm, the ends are rubber(ish) is the arm fully pushed in?

J

Do you still have your old sensor?

Hello. The arm is definitely easier to move than the old one. I turned the arm 360 degrees with the motor running and suddenly I was in the range below 250 and I could save. The problem was that when I restarted, the old 366 value was there again. This value is static and you can't manipulate it. GAP sent me an email and they suspect that the sensor is wrong or faulty. But I ordered it correctly

Maybe it is the sensor, maybe its the wiring.
Do you still have the old sensor? how does the new and old compare?

But I have dug for what I have. Note the difference in years.

J

This is for a 2007 MY which IIRC is the same as a 2009MY

I'm still wondering if you got the correct part - even if what you ordered is correct.

Yes, I thought about that too. It almost seems as if the sensor is on the left and the mounting bracket is on the right.

Hello! There is another update: The new height sensor arrived today and I installed it straight away. Same problem again. Funnily enough, I realized this during the calibration: If I raise or lower the car during calibration, the numbers change. Example: Left front tire. I raise the number goes up, I lower the number goes down. This is the case with everyone else except the right front one (where the new sensor is also installed). With the right sensor it is exactly the other way around. I lower the number goes up, I raise the number goes down. The sensor is installed 100% correctly and the plug is also wired 100% correctly.

That's very odd - have you tried swapping the +5V & the 0V lines over? I know you say it's wired correctly, if nothing else, it'll eliminate it as a possible cause.

Yes, I've already tried it. The sensor is recognized but no longer shows altitude values. The height value is always the same even when I jump around on the page.

Sounds like you have a rear sensor on the front. The voltage change is opposite between front and rear.

So it's likely a Hall effect rather than resistive track sensor then.

backinblack said:

Sounds like you have a rear sensor on the front. The voltage change is opposite between front and rear.

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I'm glad you said that! I've got a graph showing expected voltages vs. height somewhere, I'll see if I can find it! You've also got me thinking if the cause is in fact a rear sensor if both sides are tracking equally...

OP's is similar to my 2005 although I can't find anything with the part number printed on his.

I don't know what to do now. I bought two different sensors for the front right and both show the same symptoms. What else can I try ?

From the WSM:-
The sensor is supplied with a reference voltage from the air suspension control module which
measures the returned voltage to determine the sensor arm position. On the front height sensors the voltage
decreases as the vehicle height increases. On the rear sensors the voltage increases as the vehicle height
increases.
The sensors can be checked by applying 5V across the positive and negative terminals and measuring output
signal which should be a nominal 57mV ± 3% per degree of sensor arm movement.

The following graph shows the vehicle height displacement from normal against output voltage for the front
height sensors. The (blue) center line represents the "nominal" condition but depending on tolerances, the
actual line may lie anywhere between the (green) upper and (red) lower lines.

Front Height Sensor


The following graph shows the vehicle height displacement from normal against output voltage for the rear
height sensors. The (blue) center line represents the "nominal" condition but depending on tolerances, the
actual line may lie anywhere between the (green) upper and (red) lower lines.

Now I've looked at that, I'm wondering if the 5V & the output lines have been mixed up (or as suggested, it's a rear sensor) Did you check the wiring by colour or by voltage? there can be close to 5V at the wire which should be on the output when open circuit.
Ignore my comment regarding Hall effect sensors, that's not the case given your observations.

Stev said:

I don't know what to do now. I bought two different sensors for the front right and both show the same symptoms. What else can I try ?

Click to expand...

I'd suggest metering the wiring between the module and the sensor to make absolutely sure you've not got pins 4 & 5 mixed up, the colours are very similar.

According to the circuit diagram, the wiring was done correctly. The old plug had the same correct wiring. What I noticed is. In the gap tool my Range Rover is shown as a 2010 model even though it is a 2009. But the plug is for 2005-2009 models. Could that be the error?

The sensor is the same part number for 09MY & 10MY https://parts.jaguarlandroverclassic.com/parts/index/part/id/17.52080.52122.35795/brand/land-rover/ LR020627

Edit: oddly, if you look at the 10MY (vin year identifier starts AA) it's different again - LR023651 https://parts.jaguarlandroverclassic.com/lr020627-sensor-air-suspension.html?code=35795

My VIN contains AA. Could that be the reason?

I actually meant these plugs:

Yep, the 9A & AA are different, which may explain the odd behaviour when swapping pins around. The plug is mechanically the same between versions of sensor and the pins will be in the same configuration.