P38 Front Air Suspension problem
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Thread: P38 Front Air Suspension problem

  1. #1
    FRESHMAN ROVER
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    P38 Front Air Suspension problem

    The story starts with a failure of the crack angle sensor on my 2000 4.6 HSE that required a tow to my local mechanic (on a tilt tray truck).

    Three weeks later the mechanic had obtained the correct spare and fitted it. Once again the engine was operational, but now I had an issue with the air suspension.

    The rear air bags pumped up correctly, but the front air bags would not.

    I had an EASBuddy plug which I tried, but that didn't fix the problem.

    I also tried running the engine with a door open to "charge" the air reservoir,but that didn't help either.


    Any Suggestions?

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  3. #2
    SITE ADMINISTRATOR RRToadHall's Avatar
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    Re: P38 Front Air Suspension problem

    HUH, what is crack angle sensor?

    Do you mean crank position sensor? there are only 2 GEMS and Bosch

    as far as as your EASBuddy it only clears the code it does not repair anything or tell you anything. Get yourself REAL diagnostic gear and toss EAS"buddy" in the Rubbish bin, it is useless
    "The power of good is always stronger than the power of non-good.
    The power of light is stronger than the power of darkness,
    the power of knowledge is stronger than the power of ignorance."
    ~ Maharishi Mahesh Yogi~

  4. #3
    JUNIOR ROVER
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    Re: P38 Front Air Suspension problem

    Quote Originally Posted by RRToadHall View Post
    as far as as your EASBuddy it only clears the code it does not repair anything or tell you anything. Get yourself REAL diagnostic gear and toss EAS"buddy" in the Rubbish bin, it is useless
    Sure it won't repair anything but even more expensive readers don't give you terribly useful info. It resets the ECU which is far from useless after you have repaired the leak. After all, the by far most common cause of an EAS "35 max" shutdown is a leak causing the compressor to take too long to reach height. Fix the leak, reset with the Buddy, and off you go. Calling it useless......is useless.
    '99 Range Rover HSE
    '02 Audi S6

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  6. #4
    SENIOR ROVER Bolt's Avatar
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    Re: P38 Front Air Suspension problem

    Instead of beating him up about his diagnostic gear, why not read the post and apply logic to it?
    We all also knew he meant the CPS.........

    If the mechanic who installed the new CPS raised the front of the truck too high, possibly he caused a line to come off a bag, or possibly he even damaged one of the front bags or height sensors? Check the plugs and wiring to the front height sensors, and give the air lines and bags as good a look as possible.
    A type specific diagnostic like a Nano would be of assistance as well. If you post your location, someone may be nearby and could help?
    1952 Austin Champ (Hawaii)
    1953 Austin Champ (Australia)
    1985 Classic w/ Tdi300 (Australia)
    1999 4.6 HSE, White Gold "Stitch" (Wife's Daily Driver) Sold to a new enthusiast!
    2002 4.6 HSE, White "Bolt" Hawaii Daily driver (Stored in the shed for now)
    2002 4.6 HSE Borrego Yellow "Digby" West Coast cruiser and official Boat Car.
    On springs, but not for long!

  7. #5
    JUNIOR ROVER
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    Re: P38 Front Air Suspension problem

    I would also recommend the Nanocom but for just the EAS you don't need to go that far. Buy or make up a cable (see http://www.rswsolutions.com/index.ph...s-serial-cable) and download the free EASUnlock software (http://www.rswsolutions.com/index.ph...d=53&Itemid=56) and you have all the diagnostics for the EAS you will ever need. As said, the EASBuddy only resets any faults but if you haven't found what caused the fault it will only occur again.
    97 4.0SE
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    and a number of others I maintain for the owners.

  8. #6
    SENIOR ROVER
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    Re: P38 Front Air Suspension problem

    open a door while the compressor builds air, (some 10 minutes or so). then close the door to allow for self levelling, if all goes well the system should have enough pressure to allow suspension to raise almost evenly.
    this should allow volume and pressure on your favor to detect if a leak is preventing inflation.
    2k p38 4.6
    95 lwb 4.6
    01 d2 4.0

  9. #7
    FRESHMAN ROVER
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    Re: P38 Front Air Suspension problem

    P38 Front Air Suspension problem-img_1459.jpg

    I think I see the problem!

  10. #8
    FRESHMAN ROVER
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    Re: P38 Front Air Suspension problem

    P38 Front Air Suspension problem-img_1459.jpg

    I think I see the problem.....

    could it it have been winching onto a tilt tray recovery truck?

  11. #9
    SENIOR ROVER Bolt's Avatar
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    Re: P38 Front Air Suspension problem

    Yep, there's your problem!
    No, this was not done by the tow truck.
    As I first suspected, the mechanic raised the front to access the CPS and unseated the bag, then cluelessly lowered the chassis on the crimped bag. Easy enough fix, but I would ask that they eat the cost of the new bag since they caused the problem.
    1952 Austin Champ (Hawaii)
    1953 Austin Champ (Australia)
    1985 Classic w/ Tdi300 (Australia)
    1999 4.6 HSE, White Gold "Stitch" (Wife's Daily Driver) Sold to a new enthusiast!
    2002 4.6 HSE, White "Bolt" Hawaii Daily driver (Stored in the shed for now)
    2002 4.6 HSE Borrego Yellow "Digby" West Coast cruiser and official Boat Car.
    On springs, but not for long!

  12. #10
    JUNIOR ROVER
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    Re: P38 Front Air Suspension problem

    You might not need a new airbag if it is just pulled off. Just lift the body with a floor jack (wheels on the ground) high enough to partially extended the bag. Work it back into place. Start it with the door open until the compressor shut off, close door and let it lift off the jack as the bag inflates.
    Also, the shop had to have heard a loud bang when the bag came off and released its air. Nice of them to ignore it and send home with you. Wouldn't go back there if it was me.
    '99 Range Rover HSE
    '02 Audi S6

  13. #11
    SENIOR ROVER
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    Re: P38 Front Air Suspension problem

    use soapy water to help seat the bag in place. it has ridges similar to the beads of a tire, thus it must slip in place. raise the chassis a few inches leaving axle on the ground, apply soapy water liberally, work bag on bead, with chassis supported inflate suspension and it should be it.
    2k p38 4.6
    95 lwb 4.6
    01 d2 4.0

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