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Ignition Wiring Problem

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  • #1

    Ignition Wiring Problem

    ok, so I've been troubleshooting electrical gremlins in my RB25 swapped R32 GTS-T and I decided to scrap the butchered rb25 harness and start all over with a clean rb20 harness. So Basically I have rewired the injectors and ignitor to work with this harness.


    My problem now is I do not have the primary 12V going to the coils on the white wire (relay pin 3) coming from the ignition relay beside the ECU. I took some measurements and I have 12v at pins 1 and 5. Looking at this diagram it seems that pin 16 on the ecu should be switching a ground to trigger the relays to switch on. If I jumper pin 2 to ground I can get the relays to switch easily.


    Bad ecu maybe? I jumpered the primary coil wire to the battery and the car fired right up, so I know this is my only problem.

    edit: also forgot to mention I checked continuety between ecu pin 16 and ground with the key on, and cranking and it and it never was grounded.

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  • #2
    anybody?

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    • #3
      Well I now I have burnt a PIC microcontroller by grounding a groundable pin.

      I don't know if this is what happened here though.

      however, I'd advise to try another ECU if you can.

      In my case, it was for LED drivers.
      what could have happened is that the ECU give say 12V on pin 16 so that there is no voltage difference, if you ground it, well the ECU tries to send 12V and it shorts out
      the relay does switch though.
      did you change anything after it didn't work the first time?

      and is the R32 Relay the same? if it wasn't change. you see that the one on the diagram is normally open
      Marc-André
      _________
      2.2L RB20 GTS-T
      ECU modification enabled - PM me for details

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      • #4
        check the grounds at the ecu harness... Find the grounds on the pinouts and make sure they have little to no resitance... etc

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        • #5
          Originally posted by nissanconvert View Post
          check the grounds at the ecu harness... Find the grounds on the pinouts and make sure they have little to no resitance... etc
          yeah In already did that, all ECU grounds checked out OK.


          I cant think of any way those relays would work without pin 16 switching to ground. If theres no ground current would never flow through the relay trigger coil.

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          • #6
            well for anybody who is curious, this turned out to be a bad ECU. Tossed in another ECU and it fired right up without jumpering pin 16 to ground.

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