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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Pontiac Vibe. 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, Perform diagnostic system check - engine controls. See DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Select IAT sensor parameter on the scan tool. Is IAT sensor value more than or equal to 284°F (140°C)? If yes, go to step  5. If no, go to next step.
  3. Select IAT sensor parameter on scan tool. Is IAT sensor value less than or at -40°F (-40°C)? If yes, go to step  7. If no, go to next step.
  4. Use scan tool to clear DTCs. Turn ignition switch to OFF position for 30 seconds. Start engine. Operate vehicle within freeze frame conditions as specified. Does DTC P0110 set? If yes, go to step  2. If no, go to DIAGNOSTIC AIDS .
  5. Turn ignition switch to RUN position, engine OFF. Disconnect MAF sensor 5-pin harness connector. Observe MAF sensor parameter on the scan tool. Is IAT sensor value equal to -40°F (-40°C)? If yes, go to step  13. If no, go to next step.
  6. Turn ignition switch to OFF position. Check IAT sensor input circuit for a short to ground. Ensure input circuit is not shorted to the sensor ground circuit. Repair as necessary. Is the action complete? If yes, go to step  15. If no, go to step  14.
  7. Disconnect MAF sensor 5-pin harness connector. Jump IAT input circuit and sensor ground circuit together at IAT sensor harness connector. Observe IAT sensor parameter on scan tool. Is IAT sensor value more than or equal to 284°F (140°C)? If yes, go to step  9. If no, go to next step.
  8. Jump IAT sensor input circuit to ground at MAF sensor harness connector. Observe IAT sensor parameter on scan tool. Is IAT sensor value more than or equal to 284°F (140°C)? If yes, go to step  10. If no, go to step  11.
  9. Check for faulty electrical connections at MAF sensor. Repair as necessary. Was a repair necessary? If yes, go to step  15. If no, go to step  12.
  10. Turn ignition OFF. Check IAT sensor ground circuit for an open. Repair as necessary. Was a repair necessary? If yes, go to step  15. If no, go to step  12.
  11. Turn ignition OFF. Check IAT sensor input circuit for an open or a short. Repair as necessary. Was a repair necessary? If yes, go to step  15. If no, go to next step.
  12. Check for faulty IAT circuit terminal connections at PCM. Repair as necessary. Was a repair necessary? If yes, go to step  15. If no, go to step  14.
  13. Replace MAF sensor. After repair, go to step  15.
  14. Replace PCM. After repair, go to step  15.
  15. Use scan tool to clear DTCs. Turn ignition switch to OFF position 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.
  16. Using scan tool, observe stored information, CAPTURE INFO. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay at this time.
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