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Home >> Mitsubishi >> 2002 >> Eclipse RS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self Diagnostics - 2.4L >> 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 (MB991502), always turn the ignition off before connecting or disconnecting the scan tool.
  1. Connect Scan Tool (MB991502) to the data link connector. Turn the ignition on. Set the scan tool to data reading mode for item 13, Intake Air Temperature Sensor. The intake air temperature and the temperature shown with the scan tool should approximately match. Turn the ignition off. If the sensor is operating properly, it can be assumed that this malfunction is intermittent, refer to INTERMITTENT DIAGNOSTIC TROUBLE CODES . If the sensor is malfunctioning, go to next step.
  2. Check connector B-14 at the intake air temperature sensor for damage. See Figure. If the connector is in good condition, go to next step. If the connector is damaged, repair or replace it and go to step  6.
  3. Disconnect the intake air temperature sensor connector B-14. Measure the resistance between intake air temperature sensor side connector terminal 5 and 6. There should be continuity (300-1000 ohm). If the resistance is normal, go to next step. If the resistance is off, replace the volume air flow sensor and go to step  6.
  4. Check for short circuit to ground between intake air temperature sensor connector B-14 and ECM connector C-60 (M/T) or PCM connector C-54 (A/T). See Figure, Figure or Figure . If the harness wire is in good condition, go to next step. If the harness wire is damaged, repair it and go to step  6.
  5. Check connector C-60 at ECM (M/T) or connector C-54 at PCM (A/T) for damage. See Figure or Figure . If the connector is in good condition, replace the ECM or PCM and go to next step. If the connector is damaged, repair or replace it and go to next step.
  6. Carry out a test drive with the drive cycle pattern (OBD-II). Check for diagnostic trouble codes. If the DTC P0112 is output, retry the troubleshooting. If the DTC is absent, the inspection is complete.
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