LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> P0412: Secondary Air Injection Solenoid Relay Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. 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, go to DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on. Use a scan tool in order to command the Secondary Air Injection (AIR) pump and relay ON and OFF. Does AIR solenoid turn ON and OFF with each command? If yes, see DIAGNOSTIC AIDS . If no, go to next step.
  3. Turn ignition off. Disconnect AIR solenoid. Turn ignition on. Probe relay coil feed circuit with a test light connected to a good ground. Does test light illuminate? If yes, go to next step. If no, go to step  10.
  4. Connect test light between the control circuit and feed circuit at AIR solenoid harness connector. Using scan tool, command AIR solenoid on and off. If test light turns on and off with each command, go to next step. If test light does not turn on and off with each command, go to next step.
  5. If test light remains illuminated with each command, go to step  7. If test light does not remain illuminated with each command, go to next step.
  6. Test the control circuit for a short to voltage or an open. Did you find and correct the condition? If yes, go to step  13. If no, go to step  9.
  7. Test control circuit for a short to ground. Did you find and correct the condition? If yes, go to step  13. If no, go to step  9.
  8. Test for poor connections at relay. Did you find and correct the condition? If yes, go to step  13. If no, go to step  11.
  9. Check for poor connections at PCM connectors. Repair connectors as necessary. After repairs, go to step  13. If connectors are okay. go to step  12.
  10. Repair the open or short to ground in the feed circuit. After repairs, go to step  13.
  11. Replace solenoid. When complete, go to step  13.
  12. Replace PCM. Program replacement PCM. See PROGRAMMING . After repairs, go to next step.
  13. Using scan tool, clear DTCs. Turn ignition off for 30 seconds. Start engine. Operate vehicle within conditions for running the DTC. See CONDITIONS FOR RUNNING DTC . If DTC runs and passes, go to next step. If DTC resets, go to step  2.
  14. Using scan tool, check for any other DTCs that are set. If no other DTCs are set, system is okay. If any other DTCs are set, repair DTCs as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
scientia non olet · About LEMON Manuals