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Home >> Cadillac >> 2002 >> Seville SLS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P0200-P0208: Fuel Injector Control Circuits >> Diagnostic Procedures

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. With a scan tool clear the DTCs. Idle the engine at the normal operating temperature. With a scan tool, monitor the misfire current counters. 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 data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as close to the Freeze Frame/Failure Records data that you observed. 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 appropriate harness connector of the fuel injector. Turn ON the ignition, with the engine OFF. Probe the ignition voltage circuit of the fuel injector with a test lamp connected to a good ground. Does the test lamp illuminate? If yes, got o next step. If no, go to step  11.
  5. Connect the Injector Test Light (J 34730-405) between the control circuit and the ignition voltage circuit of the fuel injector harness connector. Start the engine. Does the test lamp blink? If yes, go to step  9. If no, go to next step.
  6. Does the test lamp 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 a short to voltage or an open. 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. Inspect for poor connections at the harness connector of the fuel injector. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  11. Repair the ignition voltage circuit of the fuel injector for an open or a short to ground. After repairs, go to step  14.
  12. Replace the fuel injector. After repairs, go to step  14.
  13. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, 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 DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. 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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