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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 53 (ENGINE CONTROLS SELF-DIAGNOSTICS - 2.2L)DIAGNOSTIC TESTSDTC P0201-P0204: INJECTOR CONTROL CIRCUITDIAGNOSTIC PROCEDURES
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Diagnostic Procedures

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Diagnostic Procedures
WARNING: This page is about a different car, the 2003 Pontiac Sunfire, 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM. After performing diagnostic system check - engine controls, go to next step.
  2. Observe the Freeze Frame/Failure Records for this DTC. Turn 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 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 .
  3. Turn ignition switch to OFF position. Remove the air cleaner outlet resonator. Disconnect the fuel injector harness connector. Turn ignition switch to RUN position, engine off. Probe the ignition 1 voltage circuit of the fuel injector using a test light that is connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to  10.
  4. Connect the Injector Test Light (J 34730-405) between the control circuit and the ignition 1 voltage circuit of the fuel injector. Start the engine. Does the test light flash? If yes, go to step  8. If no, go to next step.
  5. Does the test light remain illuminated at all times? If yes, go to step  7. If no, go to next step.
  6. Check the control circuit of the fuel injector for an open and for a short to voltage. Did you find and correct the condition? If yes, go to step  13. If no, go to step  9.
  7. Check the control circuit of the fuel injector for a short to ground. Did you find and correct the condition? If yes, go to step  13. If no, go to step  12.
  8. Check for an intermittent and for a poor connection at the fuel injector. Did you find and correct the condition? If yes, go to step  13. If no, go to step  11.
  9. Check for an intermittent and for a poor connection at the PCM. Did you find and correct the condition? If yes, go to step  13. If no, go to step  12.
  10. Repair the open or short to ground in the ignition 1 voltage circuit of the fuel injector. Replace the fuse as necessary. After repair, go to step  13.
  11. Replace the affected fuel injector. After repair, go to step  13.
  12. Replace PCM. See POWERTRAIN CONTROL MODULE in appropriate REMOVAL & INSTALLATION article. Perform PCM relearn procedure. See POWERTRAIN CONTROL MODULE REPROGRAMMING  under PROGRAMMING. After replacing PCM, go to next step.
  13. Using scan tool, clear the DTCs. Turn 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 DTC . Did the DTC fail this ignition? If yes, go to step  2. If no, go to next step.
  14. Using a scan tool, observe the CAPTURE INFO. Does the scan tool display any DTCs that you have not 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.