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HPDI Neutral Switch- No signal

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  • HPDI Neutral Switch- No signal

    Hi all, I am new to the forum. Just working on a new project of mine.

    2001 Z200TLRZ

    Cylinders 1 and 4 are not firing. Learned enough so far on the forum to check the neutral switch, which was intermittent when cycling with my ohm meter on it.

    Wanted to jump the switch, to see if all 6 cylinders would fire. I put in the jumper, started the motor, then put it in gear and removed the jumper. No dice.

    I put my meter on the blue/green wire from the harness with the motor running, no power. I chased the wire back a bit and saw it goes into the ECU (I think). The connector was suspect, so I opened the wire upstream for my meter, still nothing.

    I suspect that the pin out from the ECU may be a problem, but that thing is tucked back there.

    My questions:
    1. Is the neutral switch wire (blue/green) supplied with 12v from the ECU?
    2. Can I hot jump this wire to make the cylinders fire?
    3. Does anyone have a wiring diagram that shows the ECU pin outs and where this blue/green wire gets power from?

    Many thanks all.

    As a side note, I did see the cylinders fire while starting one time, but not repeatable.

  • #2
    Originally posted by ToadBroccoli View Post
    Hi all, I am new to the forum. Just working on a new project of mine.

    2001 Z200TLRZ

    Cylinders 1 and 4 are not firing. Learned enough so far on the forum to check the neutral switch, which was intermittent when cycling with my ohm meter on it.

    Wanted to jump the switch, to see if all 6 cylinders would fire. I put in the jumper, started the motor, then put it in gear and removed the jumper. No dice.

    I put my meter on the blue/green wire from the harness with the motor running, no power. I chased the wire back a bit and saw it goes into the ECU (I think). The connector was suspect, so I opened the wire upstream for my meter, still nothing.

    I suspect that the pin out from the ECU may be a problem, but that thing is tucked back there.

    My questions:
    1. Is the neutral switch wire (blue/green) supplied with 12v from the ECU? No.
    2. Can I hot jump this wire to make the cylinders fire? No. But you can disconnect the switch so that the ECU does not sense the switch being grounded.
    3. Does anyone have a wiring diagram that shows the ECU pin outs and where this blue/green wire gets power from? The blue/green wire does not get power from any where. It gets a ground from the block.

    Many thanks all.

    As a side note, I did see the cylinders fire while starting one time, but not repeatable.
    The shift position switch is grounded to tell the ECU if the motor is out of gear.

    The switch is grounded when the motor is in neutral and open when the motor is in gear. Disconnect the switch and the ECU will think the motor is in gear at all times.

    Cylinders 2 and 3 do not fire when the switch is grounded and the motor is in neutral.

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    • #3
      Thanks! I was hoping that was just a grounding wire.

      I see the black wire goes back to the ECU as well (I think). Is that needed for the ECU or does that just go to ground?

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      • #4
        One other thing, shouldn't I see a voltage signal from that line when it is disconnected from the connector with the motor running?

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