LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Chevrolet >> 2001 >> Impala LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P0412: Secondary Air Injection Solenoid Control Circuit >> Diagnostic Procedures
September 30: LEMON manuals is back up on a temporary server! Slowness is possible

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. Turn ignition on, engine off. Using scan tool, command AIR solenoid on and off. If solenoid turns on and off with each command, see DIAGNOSTIC AIDS . If solenoid does not turn on and off with each command, go to next step.
  3. Turn ignition off. Disconnect AIR solenoid connector located on top of AIR pump. Turn ignition on, engine off. Using a test light connected to ground, probe solenoid connector terminal "A" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  4. Connect test light between solenoid connector terminals. Using scan tool, command AIR solenoid on and off. If test light illuminates, go to step  8. If test light does not illuminate, go to next step.
  5. If test light remains on with each command, go to step  7. If test light does not remain on with each command, go to next step.
  6. Check Pink/Black wire between AIR solenoid and PCM for short to voltage or open circuit. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  7. Check Pink/Black wire between AIR solenoid and PCM for short to ground. Repair as necessary. After repairs, go to step  13. If circuit is okay, go to step  9.
  8. Check AIR solenoid connector for poor connections. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to step  11.
  9. Check PCM connectors for poor connections. If problem was found, repair as necessary. After repairs, go to step  13. If problem was not found, go to step  12.
  10. Repair Pink wire to AIR solenoid. After repairs, go to step  13.
  11. Replace AIR solenoid. After replacing solenoid, go to step  13.
  12. Replace PCM. Program replacement PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  13. 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.
  14. 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.
scientia non olet · About LEMON Manuals