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Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0201-206: Injector Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check, go to next step.
  2. Using scan tool, clear DTCs. Operate engine at idle and at normal operating temperature. Using scan tool, monitor misfire current counters. If any of the misfire current counters are incrementing, go to step  4. If misfire current counters are not incrementing, go to next step.
  3. Observe FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running this DTC or as close to FREEZE FRAME/FAILURE RECORDS data observed. See CODE ENABLE CRITERIA . If DTC fails this ignition, go to next step. If DTC did not fail this ignition, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect fuel injector harness connector. Using a test light connected to battery voltage, probe appropriate fuel injector control circuit. See WIRING DIAGRAMS article. Crank engine. If test light blinks when cranking engine, go to step  8. If test light does not blink when cranking engine, go to next step.
  5. If test light stays on at all times, go to step  7. If test light is not on at all times, go to next step.
  6. Check affected fuel injector control circuit for short to voltage or open between the fuel injector harness connector and PCM. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to step  14.
  7. Check affected fuel injector control circuit for short to ground between the fuel injector harness connector and PCM. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to step  17.
  8. Check the accessible fuel injector jumper harness between the multi-way harness connector and plenum for poor connections at multi-way connector, damaged, pinched or broken wires inside insulation. Repair as necessary. After repairs, go to step  18. If no problem is found, go to next step.
  9. Remove upper intake. Using test light connected to battery voltage, probe appropriate fuel injector control circuit on fuel injector harness connector and at the multi-way connector. If test light illuminates, go to step  15. If test light does not illuminate, go to next step.
  10. Using DVOM, check continuity of affected fuel injector control circuit between injector harness connector terminal and multi-way connector. If continuity does not exist, go to next step. If continuity exists, go to step  13.
  11. Check fuel injector control circuit for open or poor connections at fuel injector. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to next step.
  12. Check fuel injector ignition voltage circuit for open between fuel injector and splice. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to step  16.
  13. Check fuel injector control circuit for short to voltage or short to another circuit. Repair as necessary. After repairs, go to step  18. If circuit is okay, go to step  16.
  14. Check for poor connections at PCM harness connector. Repair as necessary. After repairs, go to step  18. If connections are okay, go to step  17.
  15. Repair short to ground in affected fuel injector control circuit. After repairs, go to step  18.
  16. Replace appropriate fuel injector. After replacing injector, go to step  18.
  17. Replace PCM. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After replacing PCM, go to next step.
  18. Turn ignition on, with engine off. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Operate vehicle within the conditions for running this DTC. See CODE ENABLE CRITERIA . If DTC runs and passes, go to next step. If DTC resets, go to step  2.
  19. Using scan tool, observe the stored information and CAPTURE INFO. If scan tool displays any undiagnosed DTCs, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are displayed, system is okay.
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