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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics - 4.3L >> Diagnostic Tests >> DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 Or P2610: Pcm Memory >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Is DTC P0602 set? If yes, go to next step. If no, go to step  5.
  3. Program the PCM. Does DTC P0602 reset? If yes, go to next step. If no, go to step  6.
  4. Ensure that all tool connections are secure. Ensure that the programming equipment is operating correctly. Ensure that the correct software/calibration package is used. Attempt to program the PCM. Refer to POWERTRAIN CONTROL MODULE  under PROGRAMMING. Does DTC P0602 reset? If yes, go to next step. If no, go to step  6.
  5. Replace PCM. See appropriate REMOVAL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  6. Clear the DTCs with a scan tool. Turn ignition off for 30 seconds. Start engine. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  7. Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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