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P0112-INTAKE AIR TEMPERATURE (IAT) SENSOR VOLTAGE TOO LOW (CONTINUED) For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes INTAKE AIR TEMP SENSOR OUT OF SPEC INTERMITTENT CONDITION (K21) SENSOR SIGNAL CIRCUIT SHORTED TO GROUND CIRCUIT WIRING HARNESS SHORTED (F855) 5-VOLT SUPPLY CIRCUIT OPEN ECM ECM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - 1. INTAKE AIR TEMP SENSOR OUT OF SPEC Disconnect the Intake Air Temperature sensor harness connector. Check connectors - Clean/repair as necessary. Measure the resistance of the Intake Air Temp sensor. Is the resistance between 300 and 90k ohms? Yes >> Go To 2 No >> Replace the Intake Air temperature sensor/MAP sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- 2. INTERMITTENT CONDITION Reconnect the circuit. Turn the ignition on. With the scan tool, erase DTCs. With the scan tool, read DTCs. Did the DTC reappear? Yes >> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELEC- No >> Go To 3 9 - 1094 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR/DH |