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ESC circuit ground?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 90K5, May 2, 2002.

  1. 90K5

    90K5 1/2 ton status

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    I'm still getting the ESC trouble code...got a printout of how to troubleshoot this thing from a local shop, and I think I have it narrowed down pretty well...I need to know where the ESC is grounded...seems like that is the problem...CKT's 486, 496 and 439 are the ones I'm needing to find. an open ground on 486 would cause the code, so would 496 if its shorted to the ground or if 439 is open...anyone know where I can find these circuits and grounds? Thanks
     
  2. jmd

    jmd Registered Member

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    What is the ECM #? Stock 90 K5 TBI ECM right? 8th digit of VIN = K? 1227747 ... not sure if I can find a pinout of that or not...

    Ahhh.

    496 should be dark blue wire & goes into E on the ESC module from the knock sensor.

    486 is brown or blk red; goes to engine ground; slot D on the ESC module.

    439 is pink/black; receives 12v ignition, goes to pin B of the ESC module.

    Matthew
     
  3. 90K5

    90K5 1/2 ton status

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    how do you figure the pin and slot lettering? Yes its a 90 TBI ECM.
     

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