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Home >> Chevrolet >> 2000 >> Prizm Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 1.8L >> Diagnostic Tests >> DTC P1600: Control Module Long Term Memory Reset >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Connect scan tool to DLC. Turn ignition on, with engine off. Using scan tool, clear DTC information. Using scan tool, place vehicle into check mode. Start engine and allow it to reach normal operating temperature. If DTC resets, go to next step. If DTC does not reset, see DIAGNOSTIC AIDS  .
  3. Check for an open EFI fuse or poor connections at fuse/relay block No. 1 located in left side of engine compartment, near air cleaner. Repair as necessary. After repairs, go to step  7 . If no problem is found, go to next step.
  4. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, with engine off. Using DVOM, check voltage at PCM harness connector battery positive voltage circuit. See WIRING DIAGRAMS article. If battery voltage is present, go to step  6 . If battery voltage is not present, go to next step.
  5. Repair open in battery positive voltage circuit between PCM and fuse/relay block No. 1. After repairs, go to step  7 .
  6. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  7. After repairs, using scan tool, clear DTC information. Road test vehicle within freeze frame conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose affected DTC(s).
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