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Thread: Normal Height Only 2008 LR3

  1. #11
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    Quote Originally Posted by Graeme View Post
    IIRC its a 40A relay but a 30A would do to prove the point.

    There is a 5A relay feed-back fuse on the sense wire back to the suspension ecu which IIRC is the other suspension fuse in the engine bay fuse panel. You might want to check that its not blown.
    Are these relays a common item or LR only configuration?

  2. #12
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    They're standard relays of the appropriate current rating.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  3. #13
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    Normal Height Only 2008 LR3

    OK - with the help of RocketRod's IID Tool some diagnostics today and the plot is thickening so any help appreciated with my first ever major fault code on the vehicle.

    To recap - Late last week I remember the car gave me a bong on starting and Special Programs Off alert and then drove as per normal. Yesterday, just after starting got the red rocking car icon and then Suspension Fault - Normal Height Only in addition to Special Programs Off. This repeats every time after startup within 10-15 seconds of start up.

    Noticed that there is no noise of the compressor running even lying with ear close to the compressor.

    Car is driving as normal but noticing today suspension is starting to sag and lose eveness. No problems with air leaks or sagging prior.

    Today we did the following;

    Read stored codes and got following Suspension errors -
    C1A27-14 (2E) Compressor circuit - General electrical failure - circuit short to ground or open
    C1A13-64 (2C) Pressure does not decrease when venting gallery - Algorithm based failure - signal plausibility failure
    C1A36-01 (6C) Exhaust valve - General failure information - general electrical failure

    On clearing and restarting only the CA127-14 code reoccured.

    We swapped his car’s EAS 70A relay with my relay for no change.

    We checked the 5A and 20A EAS fuses in the engine bay and 5A EAS fuse in glovebox compartment and all are OK.

    What is strange is that there is no power feed to the 70A relay big terminals we can detect with engine on. I was thinking to bridge these terminals to check the compressor runs. This correlates with the compressor not running at all through no power supply.

    I've checked the connections at compressor are all OK but have not rigged up power to the compressor independantly to verify. My sense is that the compressor is still OK and this is not an air supply problem but an electrical power supply problem.

    I've done some basic research on the code but come up a little blank. Does anyone have any further testing or inspection I can make?

    C1A27-14 (2E) Compressor circuit - General electrical failure.jpg

    How is the power supply to the compressor fused after the relay?

    Thanks
    Richard


  4. #14
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    The 60A fusible link 10 in the engine bay fuse box solely supplies the compressor relay. No other fuse exists for the compressor.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  5. #15
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    I have a printed copy of the 2008 D3 suspension system wiring schematic which I could scan and upload but I should have a pdf if I can only find it.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  6. #16
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    Normal Height Only 2008 LR3

    Quote Originally Posted by Graeme View Post
    The 60A fusible link 10 in the engine bay fuse box solely supplies the compressor relay. No other fuse exists for the compressor.
    Thanks! Just checked and looks blown to me explaining no power at relay



    Are those fuses standard issue also or a LR design?

    So does that mean the compressor is likely back as the culprit. It must be siezed to have blown the fuse?

  7. #17
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    The fusible links are standard.

    Most likely the link blew due to excessive current draw suggesting that the compressor may be faulty but if there was a poor contact at the link then it may have overheated.

    If the relay became stuck on due to burnt contacts then the compressor might still be OK.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  8. #18
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    I would unplug the electrical connector at the compressor then test for current draw through the link with the relay bridged to check that the wiring isn't shorting to earth somewhere before trying to run the compressor.
    MY12 RRV 4.4 TDV8 AB, +LLAMS, +e-diff, +ACC stop/go. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
    VK2HFG and APRS W1 digi

  9. #19
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    Normal Height Only 2008 LR3

    Quote Originally Posted by Graeme View Post
    I would unplug the electrical connector at the compressor then test for current draw through the link with the relay bridged to check that the wiring isn't shorting to earth somewhere before trying to run the compressor.
    Many thanks again Graeme.

    Tomorrow’s job I will run off to Repco and get a few spare fuses first thing and test as you suggest.

    I’ll get a new relay also.

  10. #20
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    Just to add to this I have had a couple of the hitachi compressors with broken conrods , 1 of which blew the fuse

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