gen 2 inverter pump

Discussion in 'Newbie Forum' started by ed928, Jul 27, 2018.

  1. ed928

    ed928 New Member

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    Hi my
    inverter pump stop
    working. I check with multimeter and there is no power to the plug. I run 12v to pump and it turns on. I was checking the 15amp am2 fuse when i remove it relay clicked and pump turned on as soon i put the fuse back it stops. Anyone know whats my problem? thank you
     
  2. bisco

    bisco cookie crumbler

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    can you drive the car with the fuse removed?
     
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  3. Elektroingenieur

    Elektroingenieur Senior Member

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    Ordinarily, the behavior should be the reverse of this, of course: the power supply for the inverter water pump comes from the AM2 fuse, through the contacts of the INV W/P relay in the driver side junction block assembly.

    If removing the fuse makes the pump run, there could be a problem in the Power Source Control ECU or a sneak circuit, perhaps caused by a defective INV W/P relay or a short or open in wiring, a connector, or a junction block. You can probably exclude the Power Source Control ECU as the cause if the IG2 relay is operating as expected when the AM2 fuse is installed: the same IG2D terminal on the ECU energizes the coils of both relays.

    I’d suggest the next step would be to get the relevant System Circuit pages from the Electrical Wiring Diagram (available by subscription to techinfo.toyota.com, among other sources) and check the circuits systematically, measuring voltage to ground, continuity, and so on.
    Probably not: the AM2 fuse provides power for fuel injectors and ignition coils, among other essential loads.
     
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