LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2003 >> Corvette Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P0412: Air Relay Control Circuit >> 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. Are DTCs P0102, P0418, P0443, P0449, P0740, P0785, P1860 also set? If yes, go to step  12. If no, go to next step.
  3. Turn ignition ON, with engine OFF. Command AIR solenoid valve ON and OFF with a scan tool. Listen for a click at the rear of the right front fender when the AIR solenoid operates. Repeat commands as necessary. Does the AIR solenoid valve turn ON and OFF when commanded with a scan tool? If yes, go to next step. If no, go to step  5.
  4. Review the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data. Does this DTC set? If yes, go to next step. If no, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  5. Turn ignition OFF. Disconnect the electrical connector of the AIR solenoid valve. Turn ignition ON, with ignition OFF. Test the AIR solenoid ignition 1 voltage circuit for an open with a test light connected to a good ground. Does the test light illuminate? If yes, go to next step. If no, go to step  13.
  6. Connect a test light between the AIR solenoid valve control circuit and the AIR solenoid valve battery voltage supply circuit. Command the AIR solenoid valve ON and OFF with a scan tool. Does the test light turn ON and OFF with each command? If yes, go to step 10. If no, go to next step.
  7. Does the test light remain illuminated with each command? If yes, go to step  9. If no, go to next step.
  8. Test the AIR solenoid valve control circuit for an open circuit or short to voltage. Did you find and correct the condition? If yes, go to step  16. If no, go to step  11.
  9. Test the AIR solenoid valve control circuit for a short to ground. Did you find and correct the condition? If yes, go to step  16. If no, go to step  15.
  10. Test for an intermittent and/or poor connections at the AIR solenoid valve. If yes, go to step  16. If no, go to step  14.
  11. Test for an intermittent and/or poor connections at the PCM. If yes, go to step  16. If no, go to step  15.
  12. Repair the short to ground in the ignition 1 voltage circuit or related components. Replace ENG IGN 1 fuse as necessary. Did you complete the repair? If yes, go to step  16.
  13. Repair the open in the ignition 1 voltage circuit. Did you complete the repair? If yes, go to step  16.
  14. Replace AIR solenoid valve. See SECONDARY AIR INJECTION SOLENOID under SOLENOIDS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to step  16.
  15. Replace PCM. See POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION - CORVETTE article. Did you complete the replacement? If yes, go to next step.
  16. 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 the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition cycle? If yes, go to step  2. If no, go to next step.
  17. Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
scientia non olet · About LEMON Manuals