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Home >> Chevrolet >> 2002 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0201-P0206: Injector Control Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  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. Using scan tool, clear DTCs. Idle engine at normal operating temperature. Using scan tool, monitor 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 FREEZE FRAME/FAILURE RECORDS data for this DTC. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC or as close to FREEZE FRAME/FAILURE RECORDS data as possible. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS .
  4. Turn ignition off. Disconnect appropriate harness connector of fuel injector. Turn ignition on, engine off. Using test light connected to ground, probe fuel injector connector terminal "A" (Pink wire). Does the test lamp illuminate? If yes, go to next step. If no, go to step  11.
  5. Connect Injector Test Lamp (J 34730-405 or J 34730-2C) between fuel injector connector terminals. Start 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. Check control circuit of affected fuel injector for short to voltage or open. Did you find and correct the condition? If yes, go to step  14. If no, go to step  10.
  8. Check control circuit of affected fuel injector for short to ground. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  9. Check fuel injector connector for poor connections. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  10. Check PCM connectors for poor connections. 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 fuel injector. After repairs, go to step  14.
  13. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within Conditions for Running DTC. Does DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. Using scan tool, observe stored information. Does scan tool displays any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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