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Home >> Chevrolet >> 2000 >> Prizm Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 1.8L >> Diagnostic Tests >> DTC P0110: IAT Sensor Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, monitor IAT sensor parameter. If IAT sensor value is 284°F (140°C) or greater, go to step  5 . If IAT sensor value is less than 284°F (140°C), go to next step.
  3. Using scan tool, monitor IAT sensor parameter. If IAT sensor value is -40°F (-40°C) or less, go to step  7 . If IAT sensor value is greater than -40°F (-40°C), go to next step.
  4. Turn ignition on, with engine off. Using scan tool, clear DTC information. Using scan tool, place vehicle into check mode. Operate vehicle within freeze frame conditions. If DTC resets, go to step  2 . If DTC does not reset, see DIAGNOSTIC AIDS  .
  5. Turn ignition on, with engine off. Disconnect IAT sensor harness connector. Using scan tool, monitor IAT sensor parameter. If IAT sensor value is -40°F (-40°C), go to step  13 . If IAT sensor value is not -40°F (-40°C), go to next step.
  6. Turn ignition off. Disconnect PCM harness connector. Check for a short to ground in IAT sensor input circuit in PCM harness connector. See WIRING DIAGRAMS article. Ensure IAT sensor input circuit is not shorted to ground circuit. Repair as necessary. After repairs, go to step  15 . If circuit is okay, go to step  14 .
  7. Disconnect IAT sensor harness connector. Using a fused jumper wire, connect IAT sensor harness connector circuits together. Using scan tool, monitor IAT sensor parameter. If IAT sensor value is 284°F (140°C) or greater, go to step  9 . If IAT sensor value is less than 284°F (140°C), go to next step.
  8. Using a fused jumper wire, connect IAT sensor harness connector input circuit to ground. See WIRING DIAGRAMS article. Using scan tool, monitor IAT sensor parameter. If IAT sensor value is 284°F (140°C) or greater, go to step  10 . If IAT sensor value is less than 284°F (140°C), go to step  11 .
  9. Check for poor connections at IAT sensor. Repair as necessary. After repairs, go to step  15 . If connections are okay, go to step  13 .
  10. Turn ignition off. Disconnect PCM harness connector. Check for open in IAT sensor ground circuit in PCM harness connector. See WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  15 . If circuit is okay, go to step  12 .
  11. Turn ignition off. Disconnect PCM harness connector. Check for open or short in IAT sensor input circuit in PCM harness connector. See WIRING DIAGRAMS article. Repair as necessary. After repairs, go to step  15 . If circuit is okay, go to next step.
  12. Check for poor connections at PCM. Repair as necessary. After repairs, go to step  15 . If connections are okay, go to step  14 .
  13. Replace IAT sensor. After replacing sensor, go to step  15 .
  14. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  15. After repairs, using scan tool, clear DTC information. Road test vehicle within freeze frame conditions that set DTC. Check for DTCs. If no DTCs are stored, repair is complete. If any DTCs are stored, diagnose affected DTC(s).
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