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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 119 (Engine Controls Self-Diagnostics) >> Diagnostic Tests >> DTC P0200: Fuel Injector Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. 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? 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 counters incrementing? If yes, go to step  4. If no, go to next step.
  3. Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the 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 cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Turn ignition OFF. Disconnect fuel injector harness connector. Turn ignition ON, with engine OFF. Probe ignition voltage supply circuit of the appropriate fuel injector with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  11.
  5. Connect the Fuel Injector Test Light between the control circuit and the ignition voltage supply circuit of the appropriate fuel injector. Start the engine. Does the Fuel Injector Test Light flash? If yes, go to step  9. If no, go to next step.
  6. Does the Fuel Injector Test Light remain illuminated at all times? If yes, go to step  8. If no, go to next step.
  7. Test the control circuit of the fuel injector for an open, a short to voltage or high resistance. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Test the control circuit of the fuel injector for a short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  9. Test for an intermittent and/or poor connections at the fuel injector. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Test for an intermittent and/or poor connections at the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
    11. NOTE: The INJ fuse also supplies voltage to the ignition coil modules. If the fuse is open, inspect all related circuits and components for a short to ground.
  11. Test the ignition 1 voltage circuit of the fuel injector for an open, short to ground or high resistance. Did you find and correct the condition? If yes, go to step  14.
  12. Replace fuel injector. See FUEL RAIL & INJECTORS under FUEL SYSTEMS in article. Did you complete the replacement? If yes, go to step  14.
  13. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to next step.
  14. 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 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 cycle? If yes, go to step  2. If no, go to next step.
  15. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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