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Home >> Chevrolet >> 2001 >> 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 powertrain diagnostic system check. See POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing powertrain diagnostic system check, go to next step.
  2. Using scan tool, clear DTCs. Idle engine at normal operating temperature. Using scan tool, monitor misfire current counters. If any counters incrementing, go to step  4. If no counters are incrementing, 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 code enable criteria or as close to FREEZE FRAME/FAILURE RECORDS data as possible. If this DTC fails this ignition cycle, go to next step. If this DTC does not fail this ignition cycle, 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). If test light is on, go to next step. If test light is off, go to step  11.
  5. Connect Injector Test Lamp (J 34730-405 or J 34730-2C) between fuel injector connector terminals. Start engine. If test light flashes, go to step  9. If test light does not flash, go to next step.
  6. If test light remains on at all times, go to step  8. If test light does not remain on at all times, go to next step.
  7. Check control circuit of affected fuel injector for short to voltage or open. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  10.
  8. Check control circuit of affected fuel injector for short to ground. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  13.
  9. Check fuel injector connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  12.
  10. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  14. If problem was not found, go to step  13.
  11. Repair open or short to ground in Pink wire between fuel injector and PCM. 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 code enable criteria. If DTC runs and passes, go to next step. If DTC does not run and pass, go to step  2.
  15. Using scan tool, observe stored information. If scan tool displays any DTCs that have not been diagnosed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If scan tool does not display any DTCs, system is okay.
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