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Home >> Mitsubishi >> 2002 >> Lancer ES, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0112: Intake Air Temperature Circuit Low Input >> Diagnostic Procedure
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Diagnostic Procedure

CAUTION: To prevent damage to scan tool, always turn ignition switch to LOCK position before connecting or disconnecting scan tool.
  1. Connect scan tool to data link connector. Turn ignition on. Set scan tool to the data reading mode for data list item 13: INTAKE AIR TEMPERATURE SENSOR. The intake air temperature and temperature shown with the scan tool should approximately match. If IAT sensor is not operating properly, go to next step. If IAT sensor is operating properly, malfunction is intermittent.
  2. Turn ignition off. Check IAT sensor harness connector for damage. Repair or replace as necessary. After repairs, go to step  6 . If connector is okay, go to next step.
  3. Using a DVOM, measure resistance between IAT sensor terminals No. 5 and 6. Resistance should be 300-1000 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace the VAF sensor. After replacing VAF sensor, go to step  6 .
  4. Check for short circuit to ground between IAT sensor harness connector and ECM harness connector C-115 (M/T) or PCM harness connector C-118 (A/T). Repair as necessary. After repairs, go to step  6 . If circuit is okay, go to next step.
  5. Check ECM harness connector C-115 (M/T) or PCM harness connector C-118 (A/T) for damage. Repair or replace as necessary. After repairs, go to next step. If connector is in good condition, replace ECM or PCM. After replacing ECM or PCM, go to next step.
  6. Test the OBD-II drive cycle. Carry out a test drive with the drive cycle pattern. See OTHER MONITOR  under VERIFYING REPAIRS. Check for DTCs. If DTC P0112 is output, repeat diagnosis. If DTC P0112 is not output, inspection is complete.
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