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No Response From Powertrain Control Module

  1. If engine runs, go to next step. If engine does not run, see NO START DIAGNOSIS in BASIC DIAGNOSTIC PROCEDURES article in ENGINE PERFORMANCE.
  2. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. See COMPONENT LOCATIONS  . Turn ignition on. Connect a jumper wire between ground and PCM connector C3 terminal No. 30 (Violet/Brown wire). See Figure . Using scan tool, perform CCD BUS test. If scan tool displays BUS SHORT TO GROUND, go to next step. If scan tool does not display BUS SHORT TO GROUND, repair open Violet/Brown wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  3. Move jumper wire to PCM connector C3 terminal No. C28 (White/Black wire). Perform CCD BUS test. If scan tool does not display BUS SHORT TO GROUND, repair open in White/Black wire. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If scan tool displays BUS SHORT TO GROUND, replace PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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