Datatek
Well-Known Member
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- 45,058
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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.
suspension in extended mode and Suspension failure
- Thread starter Stev
- Start date
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Stev
Member
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- 29
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
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Stev
Member
- Posts
- 29
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.
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Sounds like you have a rear sensor on the front. The voltage change is opposite between front and rear.
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...
- Posts
- 6,241
- Location
- North Manchester
OP's is similar to my 2005 although I can't find anything with the part number printed on his.
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.
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.
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.
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
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
