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  • P0111 Intake Air Temperature (IAT) Sensor Rationality

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    P0111 INTAKE AIR TEMPERATURE (IAT) SENSOR RATIONALITY

    When Monitored and Set Condition:

    When Monitored: While the engine is running.
    Set Condition: The ECM does not read a change in value from the sensor over time.

    POSSIBLE CAUSES

    • FAILED IAT SENSOR
    • INTERMITTENT CONDITION

    DIAGNOSTIC PROCEDURE

    NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

    1. Remove the temperature sensor and reconnect the wiring to the sensor. Monitor DRBIII®, while heating the sensor with an external heat source (DO NOT USE OPEN FLAME). Does the reading from the sensor increase at least 5 degrees F. on the DRB?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Replace the Intake air temp sensor/MAP sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

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