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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 370 (Engine Control System - Self-Diagnostics - 4.2L) >> Diagnostic Tests >> DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683 Or P2610: Pcm Memory >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  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 the programming equipment is operating correctly. Ensure the correct software and the correct calibration 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 PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  6. Turn ignition on, with engine off. Use scan tool in order to clear DTCs. Turn ignition off for 30 seconds. Start engine. Does scan tool display any DTCs? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, go to next step.
  7. Observe the stored information, Capture Info with scan tool. Does 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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