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Home >> Pontiac >> 2002 >> Aztek FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0200-P0206: Fuel Injector Control Circuits >> Diagnostic Procedures
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Diagnostic Procedures

  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. Clear the DTCs with a scan tool. Idle the engine at the normal operating temperature. Monitor the misfire current counters with a scan tool. Are any of the misfire current counters incrementing? If yes, go to step  4. If no, go to next step.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC, or within the observed parameters of the Freeze Frame/Failure Records. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Turn OFF the ignition. Disconnect the fuel injector harness multi-way connector. Jumper the three camshaft position (CMP) sensor circuits between the fuel injector harness multi-way connections. Probe the appropriate fuel injector control circuit, Powertrain Control Module (PCM) side, with a test lamp connected to battery voltage. Crank the engine. Does the test lamp blink when cranking the engine? If yes, go to step  8. If no, go to next step.
  5. Does the test lamp remain illuminated at all times? If yes, go to step  7. If no, go to next step.
  6. Test the control circuit of the fuel injector for a short to voltage or an open between the multi-way connector and the PCM. Did you find and correct the condition? If yes, go to step  18. If no, go to step  14.
  7. Test the control circuit of the fuel injector for a short to ground between the multi-way connector and the PCM. Did you find and correct the condition? If yes, go to step  18. If no, go to step  17.
  8. Inspect the accessible fuel injector jumper harness between the multi-way connector and the plenum for the following conditions:
    • Poor connections at the multi-way connector.
    • Damaged or pinched wiring.
    • Broken wires inside the insulation.

    Did you find and correct the condition? If yes, go to step  18. If no, go to next step.

  9. Remove the upper intake. Probe the appropriate fuel injector control circuit, fuel injector side, at the multi-way connector, with a test lamp connected to battery voltage. Does the test lamp illuminate? If yes, go to step  15. If no, go to next step.
  10. With a DMM, test for continuity between the ignition voltage terminal and the appropriate fuel injector control circuit terminal, at the multi-way connector. Does the DMM indicate OL? If yes, go to next step. If no, go to step  13.
  11. Test the control circuit of the fuel injector for an open, or poor connections at the fuel injector. Did you find and correct the condition? If yes, go to step  18. If no, go to next step.
  12. Test the ignition voltage circuit of the fuel injector for an open between the fuel injector and the splice. Did you find and correct the condition? If yes, go to step  18. If no, go to step  16.
  13. Test the control circuit of the fuel injector for a short to voltage, or a short to another circuit. Did you find and correct the condition? If yes, go to step  18. If no, go to step  16.
  14. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  18. If no, go to step  17.
  15. Repair the short to ground in the fuel injector control circuit. After repairs, go to step  18.
  16. Replace the appropriate fuel injector. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step  18.
  17. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  18. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  19. 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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