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P0111 Intake Air Temperature (IAT) Sensor Rationality

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By Mopar1973Man

· 2,529 views

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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