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Home › Ford › 2021 › F-150 Raptor › Repair and Diagnosis › Engine Performance › System › Engine Controls - Pinpoint Tests (Diesel) › Pinpoint Tests DL: Cylinder Head Temperature (CHT) Sensor › Test Procedure

Test Procedure

  1. DL1 CHECK FOR DTCS 

    Are DTCs P1022, P1023, P2C3A, or P2C3B present? 

    Yes No
    GO to  DL2. RETURN to SYMPTOM CHARTS for further direction.
  2. DL2 CHECK THE RESISTANCE OF THE CHT2 SENSOR WITH THE ENGINE OFF 
    NOTE: Refer to the chart at the beginning of this test for the resistance specifications.
    • Ignition OFF.
    • CHT2 Sensor connector disconnected.
    • Measure the resistance between:
    (+) CHT2 Sensor Connector, Component Side (-) CHT2 Sensor Connector, Component Side
    CHT2 - Pin 1 SIGRTN - Pin 2

    Is the resistance within specification? 

    Yes No
    GO to  DL3. INSTALL a new CHT2 sensor.
    REFER to the appropriate Electronic Engine Controls article.
    CLEAR the DTCs. REPEAT the self-test.
  3. DL3 CHECK FOR AN OPEN CIRCUIT 
    • Ignition OFF.
    • PCM-E connector disconnected.
    • Measure the resistance between:
    (+) PCM-E Connector, Harness Side (-) CHT2 Sensor Connector, Harness Side
    SIGRTN - Pin 60 SIGRTN - Pin 2

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DL4. REPAIR the open circuit. Clear the PCM DTCs.
    REPEAT the self-test.
  4. DL4 CHECK FOR A SHORT TO GROUND 
    • Measure the resistance between:
    (+) CHT2 Sensor Connector, Harness Side (-)
    CHT2 - Pin 1 Ground

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DL5. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  5. DL5 CHECK FOR A SHORT TO VOLTAGE 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
    (+) CHT2 Sensor Connector, Harness Side (-)
    CHT2 - Pin 1 Ground

    Is any voltage present? 

    Yes No
    REPAIR the short circuit. Clear the PCM DTCs.
    REPEAT the self-test.    		 GO to  DL6.
  6. DL6 CHECK THE RESISTANCE OF THE CHT SENSOR 
    NOTE: Refer to the chart at the beginning of this test for the resistance specifications.
    • Ignition OFF.
    • CHT2 Sensor connector connected.
    • PCM-E connector connected.
    • Run the engine until the engine temperature stabilizes.
    • Ignition OFF.
    • CHT2 Sensor connector disconnected.
    • Measure the resistance between:
    (+) CHT2 Sensor Connector, Component Side (-) CHT2 Sensor Connector, Component Side
    CHT2 - Pin 1 SIGRTN - Pin 2

    Is the resistance within specification? 

    Yes No
    GO to  DL7. INSTALL a new CHT2 sensor.
    REFER to the appropriate Electronic Engine Controls article.
    CLEAR the DTCs. REPEAT the self-test.
  7. DL7 CHECK THE CHT2 SENSOR 
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      (+) CHT2 Sensor Connector, Harness Side (-) CHT2 Sensor Connector, Harness Side
      CHT2 - Pin 1 SIGRTN - Pin 2
    • Observe the digital multi meter (DMM) for an indication of a concern while shaking, wiggling, and bending the CHT2 circuit between the CHT2 and the PCM. Note that voltage changes suddenly when a concern is detected.

    Is a concern present? 

    Yes No
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DL8.
  8. DL8 TEMPERATURE SENSOR CORRELATION 
    NOTE: Cold soak the vehicle at ambient temperature for at least 6 hours while not in direct sunlight.
    NOTE: All PID's may not be available on all vehicles.
    • Ignition OFF.
    • CHT2 Sensor connector connected.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the AAT (TEMP), CHT2 (TEMP), ECT (TEMP) and ECT1 (TEMP) PIDs.

    Are the PID values within 16.67°C (30°F) of each other? 

    Yes No
    Unable to duplicate or identify the concern at this time.
    GO to PINPOINT TEST ZZ .    		 INSTALL a new CHT2 sensor.
    REFER to the appropriate Electronic Engine Controls article.
    CLEAR the DTCs.
    Clear the PCM DTCs. REPEAT the self-test.
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