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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 104 (Engine Controls Self-Diagnostics - 6.5L) >> Diagnostic Tests >> DTC P0601-P0607, P1600, P1621, P1680, P1681 & P1683: Pcm Memory >> Diagnostic Procedures

Diagnostic Procedures

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  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. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. 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. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. Does DTC P0602 reset? If yes, go to next step. If no, go to step  6 .
  5. Replace the PCM. See appropriate REMOVAL, OVERHAUL & 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 OFF the ignition for 30 seconds. Start the engine. Did the DTC fail this ignition cycle? 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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