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Home >> Chevrolet >> 2000 >> Tracker 4D Utility, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0111: Intake Air Temperature Sensor Performance >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing OBD system check, go to next step.
  2. Install scan tool. Let engine cool to ambient air temperature. Turn ignition on, with engine off. Compare IAT sensor value with ambient air temperature. If scan tool displays IAT sensor value within 0-9°F (0-5°C) of ambient temperature, go to next step. If scan tool does not display IAT sensor value within 0-9°F (0-5°C) of ambient temperature, go to step  4.
    3. NOTE: While performing this step, observe IAT sensor parameter on scan tool. Look for a skip, jump or no movement in IAT value while temperature increases or decreases.
  3. Remove IAT sensor from air cleaner housing, leaving harness connector connected. Wrap a cool, damp shop towel around sensor to lower sensor temperature while observing scan tool. Remove shop towel. Wrap a warm shop towel around sensor to increase sensor temperature while observing scan tool. If scan tool reading skipped, jumped or remained constant during test, go to step  9. If scan tool reading did not skip, jump or remain constant during test, see DIAGNOSTIC AIDS .
  4. Disconnect IAT sensor harness connector. Connect a fused jumper wire between IAT harness connector terminals. If scan tool displays 329°F (165°C), go to step  9. If scan tool does not display 329°F (165°C), go to next step.
  5. Remove fused jumper wire. Disconnect PCM harness connectors. Using DVOM, check resistance in IAT sensor input circuit between PCM and IAT sensor. If resistance is less than 0.5 ohm, go to next step. If resistance is 0.5 ohm or greater, go to step  7.
  6. Using DVOM, check resistance in IAT sensor ground circuit between IAT sensor and PCM. If resistance is less than 0.5 ohm, go to step  10. If resistance is not less than 0.5 ohm, go to step  8.
  7. Repair short to ground or high resistance in IAT sensor input circuit between IAT sensor and PCM. Repair as necessary. After repairs, go to step  11.
  8. Repair open or high resistance in IAT sensor ground circuit between IAT sensor and PCM. Repair as necessary. After repairs, go to step  11.
  9. Replace IAT sensor. After replacing sensor, go to step  11.
  10. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  11. After repairs, clear DTCs. Operate 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 DTC(s).
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