Hi Guy's, I have a 1997 Range Rover Autobiography, 4.6l petrol, have had it for 3 year's. I have ongoing problem's with the air suspension. In the last year i have replaced the Valve block, replaced every o ring, rebuilt the compressor. Was working fine untill 3 week's ago when it went into fault mode. Being a retired Mechanic i like to do thing's myself. I've replaced both the computer and the relay under the passenger seat.I have got it out of fault mode but the compressor wont pump. It will work if i connect it to power, now i'v'e checked and rechecked every fuse and relay, all are fine. My question is does the driver unit on the valve block operate the pump, I have changed the driver unit with a spare one and no difference. I do have a manual setup i installed where i can pump each air bag up, but i want to keep the car original. I'm hoping someone can help. Cheer's from Australia. John.
P38A Air Suspension, Pump Problem's
- Thread starter bronco1b
- Start date
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Could be the thermal trip inside the pump...they have been known to fail.
Try grounding the orange wire (from memory - check the RAVE wiring diagram for which one it is!) as this is the thermal cutout trip wire...if the compressor runs, your thermal cutout is shagged.
Try grounding the orange wire (from memory - check the RAVE wiring diagram for which one it is!) as this is the thermal cutout trip wire...if the compressor runs, your thermal cutout is shagged.
Hi There, Thank's for replying, I just tested the orange wire, no difference, it has to be the orange wire, there is only three wires, black is negative, green goes to power, if i connect these two to my jump starter the pump runs.
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So you grounded the orange wire and still had the pump plugged in yes? grounding can be done by scrapping a bit of the insulation off and using a short length of wire to an earth point to provide the required ground signal.
Is the system currently in a fault condition? if so, the pump won't run regardless.
Is the system currently in a fault condition? if so, the pump won't run regardless.
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could the pressure switch be faulty?
Yes to first question and the system is not in fault mode.
Hi, is the pressure switch connected to the driver unit, if so i tried changing that with another driver unit
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The pressure switch is screwed into the valve block underneath.....I am not sure if the signal from it goes via the driver pack or not - again RAVE will tell you.
If the pressure switch is faulty, it can prevent the pump running.
Are you able to run the compressor via the diagnostic software you are using?
If the pressure switch is faulty, it can prevent the pump running.
Are you able to run the compressor via the diagnostic software you are using?
hi, i'm not using any software.
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Your original message says it went into fault mode....until the fault is cleared the pump won't run.
hi again, i assume the pressure switch is the green one which is wired into the driver unit, there is a brass one very close to it but no wires, i assume it's a relief valve, i did purchase a diagnostic cable and software some time ago from the UK but we have just moved house and all my workshop gear is still boxed up.
will that original fault mode still apply if i have changed the computer under the passenger seat. Cheer's. John.
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If the fault still exists in the system, then all the new ECU will do is pick up the fault and stop....
It is a bit like have a broken TV aerial and loosing signal, so you change your telly and still can't get a signal....cos the aerial is still broken!
It is a bit like have a broken TV aerial and loosing signal, so you change your telly and still can't get a signal....cos the aerial is still broken!
okay. many thank's.
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Neither compressor nor pressure switch have anything to do with driver pack. Driver pack is a slave of the ECU used to open and close valves. ECU switches compressor on and off subject to signals from pressure switch. See my guide in Tech archive.
Thank You. John.
Being new to forum's, where would i find Tech Archives. John.
blue beasty
Leaks an prone to bits dropping off
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Thank you, I found it as soon as i posted the question.
