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Thread: LBZ conversion starts then dies

  1. #1
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    Default LBZ conversion starts then dies

    Hi All EFILive users.
    I require some help with a starting issue I have with my LBZ conversion into a Aussie Nissan Patrol. ( Yes another Patrol & Aussie).
    I have got the engine running but have got an issue with having to wait at least 12 seconds or more before the engine fire up properly & can drive away. It is like there is a extended wait to start feature there.

    The engine will fire when the key is started straight away but then die's. It's as though it fires on rail pressure then die's. Try to start again and it is very sluggish to fire & takes some time before you can drive it.

    Set up of the engine is as follows.
    -Only has engine & trans Controllers.
    -Wiring designed by myself.
    -Have disabled the Vats (I think)
    -Disable EGR (I think)
    - Haven't use the ECM relay circuit to power up the ECM, have used the Nissan powering system

    This is the first Conversion I have done & if anyone is willing to release info that could help me with this issue, I will be much appreciated.

    If you want to PM info the will be appreciated also.

    Regards Gards

  2. #2
    Lifetime Member GMPX's Avatar
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    If VATS wasn't disabled I would suggest it would not even run at all.
    I don't know what your issue might be but have you checked if there is any DTC's getting stored?
    I no longer monitor the forum, please either post your question or create a support ticket.

  3. #3
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    I have checked & there is some DTC's stored.
    At present, I don't have them with me. The car is 250km away at the moment.
    I do know though once I have the car running, I can clear all the codes & nothing else shows up.
    Go & start the engine again & DTC's come up again.
    I do have to work through the codes when I down at the car next week & will take note of what they are.
    I have been reading some forums that have got a symptom close to what I have & it leads to the ECM relay circuit. This is one relay that I DO NOT have wired up. I am going to try with the relay in the harness & see how it goes.

    Thank you for the help.

  4. #4
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    Hi guys

    Finally got the DTC's
    As Follows

    Diagnostic Trouble Codes
    P2510 ECM/PCM Power Relay Sense Circuit Range/Performance EPA Pending
    U0101 Lost Communication With TCM EPA Pending
    P0045 Turbo/Super Charger Boost Control Solenoid Circuit EPA Pending
    P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low EPA Pending
    P0113 Intake Air Temperature (IAT) Sensor Circuit High EPA Pending
    P0700 Transmission Control Module (TCM) Requested MIL Illumination EPA Pending
    P0646 A/C Clutch Relay Control Circuit Low P
    P0532 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit Low Voltage P
    P0102 Mass Air Flow (MAF) Sensor Circuit Low P
    P2122 Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage H
    P2127 Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage H
    P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low MH
    P0463 Fuel Level Sensor 1 Circuit High Voltage P
    U0106 Lost Communication With Glow Plug Control Module P
    U0101 Lost Communication With TCM MH
    P0700 Transmission Control Module (TCM) Requested MIL Illumination H
    P0381 Wait to Start Lamp Control Circuit PHC
    P2510 ECM/PCM Power Relay Sense Circuit Range/Performance MPHC
    P0522 Engine Oil Pressure (EOP) Sensor/Switch Circuit Low Voltage H
    P0827 Up and Down Shift Switch Circuit Low PHC

    If anyone can make heads or tails of these, it would be much appreciated.
    Once I have the engine running, I can clear all the codes & the engine light goes out & car drives normally.

    I have a feeling it may have something to do with the ECM power relay sense circuit, but I don't know what to do to fix this Code.
    I have temp wired in a relay using the ECM relay wire pin 19 C2 & still have no luck.

    The only other thing that may be an issue is that the O ign power should be live in Acc/Run/Start on the key,
    I have only got power to this in run/start.
    Could this cause any prob's do you think?
    Will post up conclusion of what I find if get there.

    Kind Regards
    Gards
    Regards Gards

  5. #5
    Lifetime Member THEFERMANATOR's Avatar
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    You have a problem with the igntion 1 relay I believe it is. The ECM commands this relay on, and if it doesn't you will get those ECM/PCM power relay sense circuit codes. And if everything doesn't power up in sequence, you will also get the communication error codes.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  6. #6
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    Thanks Ferm

    Mate I temp wired in the ECM relay but didn't have it switching the power to Ign1 (used what I had wire with the Patrol) & this didn't change anything.
    I have been looking at the Ign0 power & how it is live in Acc/Run/ start. With the harness, this is not wired this way. The power is live only when in Run/Start.
    C
    Do you think this may have something to do with the power up sequence of the ECM.
    The other thing is, on another forum, a guy has found info saying that the code could also be affecting the power down sequence of the ECM.
    I think I might have to look at the way I am powering up the ECM again.

    I really do thank all of those who are helping with ideas. I do know that we will conquer this problem.
    I know it is hard for you guys in the US. not know how the wiring is on the car in Aus.
    Thank you again

    Regards Gards
    Regards Gards

  7. #7
    Lifetime Member THEFERMANATOR's Avatar
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    I doubt having the IGN0 not on during acc is affecting anything. The only way that could be a problem was if it was in a truck and the BCM was controlling things. It still sounds like a problem with the power up and down sequence as I know the DURABURB guys ran into this early on with LBZ swaps.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

  8. #8
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    Tongue in cheek, is there any way that I may be able to get a diagram on how the Duraburbs have wired in the power.
    Also, do you know what the sequence is for power up & down the ECM for the LBZ.
    I am going to have a closer look at the power supply for the ECM & see if there is anything that I may have over looked.
    Thank you Ferm
    You are being very helpfully in trying to nut out this problem.

    Regards
    Gards
    Regards Gards

  9. #9
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    Hi Guys

    Just thought that I might post what wires I have removed from the ECM plugs to see if there is an issue with that.

    As follows, C2 plug
    13- a/c low ref
    18- pto cont
    22- chmsl+
    24- gen sig 2
    27- 5v ref a/c
    31- a/c comp
    34- low ref
    35- a/c refr sig
    36- fuel lev sig
    42- veh spd sig
    50- fuel lev sig
    54- veh spd sig

    Floowing is C1 plug
    85- WIF
    84- back up v
    82-axle sig
    31- eng shut off
    32- cpp sw sig
    8- pto sig
    60- pto on sw sig
    9- oil level sw
    58- coolant lev sig
    57-4wd low sig

    All the power wires are power in the run & start position.
    All earth wires that remain are earth to body/ engine & battery where they can.

    I am still trying to find info on how the power up sequence & power down sequence works in the ECM.
    I can change the wiring power system if I have got this wrong.

    Cheers for the help
    Regards Gards

  10. #10
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    Sorry just another quick question.

    Could there be a fault in the ECM that may be causing these codes.?
    With the DTC's active, can I change the ECM with another 1 to see if the DTC's are still there or could this damage the next ECM?

    Cheers
    Regards Gards

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