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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Engine Control System Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 Or P1683: Control Module Read Only Memory >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Is DTC P0602 set? If yes, go to next step. If no, go to step  5.
  3. Program PCM, see POWERTRAIN CONTROL MODULE  under PROGRAMMING. Recheck DTCs. Does DTC P0602 reset? If yes, go to next step. If no, go to next step  6.
  4. Verify that all tool connections are secure. Verify the programming equipment is operating correctly. Verify the correct software package and the correct calibration package is used. Attempt to program the PCM. Does DTC P0602 reset? If yes, go to next step. If no, go to step  6.
  5. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  6. Turn ignition on, with engine off. Use a scan tool in order to clear DTCs. Turn ignition off for 30 seconds. Start the engine. Does the scan tool display any DTCs? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  7. With a scan tool, observe the stored information, Capture Info. 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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