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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (6.7L Diesel - DTCS - P040D To P1191 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P1191 - Inlet Air Temperature Sensor Rational/Performance >> Testing >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THE INLET AIR TEMPERATURE SENSOR 
    1. Remove the temperature sensor and reconnect the wiring to the sensor.
    2. With the scan tool in Sensors, monitor the Inlet Air Temperature.
    3. While heating the sensor with an external heat source (DO NOT USE OPEN FLAME).

      Does the reading from the sensor increase at least 5° F on the scan tool?

      Yes 

      • Go To  2.

      No 

      • Replace the Inlet Air Temperature/Pressure Sensor in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  2. CHECK THE INLET AIR TEMPERATURE SENSOR 
    1. After an eight hour cold soak, with the scan tool connected, monitor Inlet Air Temperature Sensor, Battery Temperature Sensor, Intake Air Temperature Sensor and Engine Coolant Temperature Sensor.
      NOTE:

      Make sure inlet air temperature is above 20° F when performing this test.

      NOTE:

      Make sure there is no external heat source, such as a block heater, operating during this test or within the eight hour cold soak.

      Does the Inlet Air Temperature Sensor read differently from the other sensors?

      Yes 

      • Go To  3.

      No 

  3. CHECK FOR HIGH RESISTANCE IN THE (K615) INLET AIR TEMPERATURE SENSOR SIGNAL CIRCUIT 
    1. Disconnect the Inlet Air Temperature/Pressure Sensor harness connector.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance of the (K615) Inlet Air Temperature Sensor Signal circuit between the Inlet Air Pressure/Temperature Sensor harness connector and the PCM C1 harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Replace the Inlet Air Temperature/Pressure Sensor in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      No 

      • Repair the (K615) Inlet Air Temperature Sensor Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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