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No Response From Powertrain Control Module

  1. If engine does not run, see appropriate article in ENGINE PERFORMANCE. If engine runs, turn ignition off. Disconnect Powertrain Control Module (PCM). Turn ignition on. Connect jumper wire between ground and terminal No. C30 (Violet/Brown wire) on PCM connector. Using scan tool, perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORT TO GROUND, go to next step.
  2. Move jumper wire to terminal No. C28 (White/Black wire) on PCM connector. Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open White/Black wire. If scan tool displays BUS SHORT TO GROUND, replace PCM.
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