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DTC P0111: Intake Air Temp Performance: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If GOOD TRIP counter is displayed for DTC P0111 and displayed count is "0", go to next step. If GOOD TRIP counter is not displayed for DTC P0111 or displayed count is not "0", go to step  7 .
  2. Turn ignition off. Disconnect IAT sensor connector. See Figure or Figure . Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, turn ignition on. Using scan tool, read IAT sensor voltage. If voltage is more than 4.6 volts, go to next step. If voltage is 4.6 volts or less, go to step  4 .
  3. Turn ignition off. Connect a jumper wire between IAT sensor harness connector terminals. Turn ignition on. Using scan tool, read IAT sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace IAT sensor.
  4. Turn ignition off. Reconnect all connectors. Using a voltmeter, backprobe Black/Light Blue wire between IAT harness connector and terminal A4 at PCM C1 harness connector. See Figure . PCM is located on firewall in right rear corner of engine compartment. Start engine and note voltage reading. If voltage is less than 0.1 volt, go to next step. If voltage is 0.1 volt or more, repair poor connection causing high resistance in Black/Light Blue wire.
  5. Turn ignition off. Using a voltmeter, backprobe Black/Red wire between IAT harness connector and terminal A15 at PCM C1 harness connector. See Figure . Start engine and note voltage reading. If voltage is less than 0.1 volt, go to next step. If voltage is 0.1 volt or more, repair poor connection causing high resistance in Black/Red wire.
  6. At this time, PCM is assumed to be defective. Replace PCM.
  7. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Start engine and allow it to idle. Ensure engine is at normal operating temperature. Using scan tool, monitor IAT sensor voltage while wiggling connectors and wiring harness from IAT sensor to Powertrain Control Module (PCM). See Figure or Figure . PCM is located on firewall in right rear corner of engine compartment. If voltage changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused voltage to change. If voltage does not change, review FREEZE FRAME data using scan tool. Attempt to duplicate condition that caused DTC to set by paying special attention to the conditions during which IAT sensor is monitored. Check for any related technical service bulletins that may apply. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If no problems are indicated, go to next step.
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