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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 108 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L BI-FUEL)DIAGNOSTIC TESTSDTC P0201-P0204: INJECTOR CONTROL CIRCUITDIAGNOSTIC PROCEDURE
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Diagnostic Procedure

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Chevrolet Cavalier. 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 (Alternative Fuels). If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS (ALTERNATIVE FUELS)  under SELF-DIAGNOSTIC SYSTEM.
  2. Observe the DTC information using a scan tool. Did the DTC P1020 also set this ignition cycle? If yes, go to DTC P1020: FUEL INJECTOR CONTROL CIRCUIT . If no, go to next step.
    3. NOTE: Verify that the gasoline fuel level is above 10 percent to prevent misdiagnosis. The misfire counters may not increment if the gasoline fuel level is below 10 percent.
  3. Remove the AF relay. Idle the engine at normal operating temperature. Monitor the misfire current counters using a scan tool. Are any of the misfire current counters incrementing? If yes, go to step  5. If no, go to next step.
  4. Observe the Freeze Frame/Failure Records for this DTC. Turn the ignition switch to OFF position for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING THE DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, go to DIAGNOSTIC AIDS .
  5. Turn ignition switch to OFF position. Disconnect the gasoline fuel injector harness connector which displays the highest level of misfire. Probe the ignition voltage circuit of the gasoline fuel injector using a test light connected to a good ground. Turn ignition switch to RUN position, engine OFF. Does the test light illuminate? If yes, go to next step. If no, go to step  15.
  6. Probe the injector control circuit using a test light connected to battery voltage. Idle the engine, while observing the test light. Does the test light blink? If yes, go to step  12. If no, go to next step.
  7. Turn ignition switch to OFF position. Remove the appropriate AF fuel injector relay. Probe the injector control circuit, from the PCM, using a test light connected to battery voltage. Idle the engine, while observing the test light. Does the test light blink? If yes, go to step  9. If no, go to next step.
  8. Does the test light remain illuminated? If yes, go to step  11. If no, go to step  10.
  9. Check the fuel injector control circuit for an open or a short to ground between the gasoline fuel injector and the relay. Did you find and correct the condition? If yes, go to step  19. If no, go to step  13.
  10. Check the control circuit of the fuel injector for an open, or a short to voltage between the PCM and the relay. Did you find and correct the condition? If yes, go to step  19. If no, go to step  14.
  11. Check the fuel injector control circuit for a short to ground between the PCM and the relay. Did you find and correct the condition? If yes, go to step  19. If no, go to step  18.
  12. Check for an intermittent and for a poor connection at the gasoline fuel injector. Did you find and correct the condition? If yes, go to step  19. If no, go to step  17.
  13. Check for an intermittent and for a poor connection at the AF injector relay. Did you find and correct the condition? If yes, go to step  19. If no, go to step  16.
  14. Check for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  19. If no, go to step  18.
  15. Repair the open or short to ground on the ignition voltage circuit of the gasoline fuel injector. After repair, go to step  19.
  16. Replace the AF injector relay. After repair, go to step  19.
  17. Replace the appropriate gasoline fuel injector(s). After repair, go to step  19.
  18. Replace the PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - CAVALIER & SUNFIRE article. Program PCM with correct vehicle software and calibration. After repair, go to next step.
  19. Clear the DTCs using a scan tool. Turn ignition switch to OFF position for 30 seconds. Turn ignition switch to RUN position, engine OFF. Operate the vehicle within the Conditions for Running the DTC. See CONDITIONS FOR RUNNING THE DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  20. Observe the CAPTURE INFO using a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.