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Home >> Ford >> 2011 >> Focus S, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Pinpoint Test DL: Cylinder Head Temperature (CHT) Sensor Through Pinpoint Test DX: Engine Coolant Temperature (ECT) Sensor - (Except Diesel & Hybrid) >> PINPOINT TEST DL: Cylinder Head Temperature (CHT) Sensor >> Test Procedure

Test Procedure

  1. DL1 CHECK FOR DIAGNOSTIC TROUBLE CODES (DTCS) 

    Are DTCs P0116, P0119, P0125, P0128, P1285, P1288, P1289, P128A, P1290, or P1299 present? 

    Yes No
    For DTC P1288, GO to  DL2.
    For KOEO and KOER DTCs P1289 or P1290, GO to  DL8.
    For continuous memory DTCs P0119, P1289, P128A, or P1290, GO to  DL15.
    For KOEO or continuous memory DTC P1299, GO to  DL21.
    For continuous memory DTCs P0125 or P0128, GO to  DL22.
    For continuous memory DTC P0116, GO to  DL24.
    For DTC P1285, GO to  DL18.    		 For temperature warning indicator lamp or gauge (applications with CHT sensor only) symptom, GO to  DL29.
    For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. DL2 SELF-TEST DTC P1288: CHECK THE COOLING SYSTEM 
    WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
    • The DTC indicates the temperature sensor is out of self-test range. The engine is not at normal operating temperature.
    • Check the vehicle coolant level.

    Is the cooling system OK? 

    Yes No
    GO to  DL3. REFER to the appropriate Engine Cooling, for loss of coolant diagnosis.
    Clear the PCM DTCs. REPEAT the self-test.
  3. DL3 CHECK IF THE VEHICLE ENGINE STARTS 
    • Attempt to start the engine.

    Does the engine start and run normally? 

    Yes No
    GO to  DL6. GO to  DL4.
  4. DL4 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF 
    NOTE: Refer to the chart at the beginning of this test for the RESISTANCE REFERENCE CHART  for resistance specifications.
    • Ignition OFF.
    • CHT Sensor connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Component Side (-) CHT Sensor Connector, Component Side
      CHT SIGRTN

    Is the resistance within specification? 

    Yes No
    GO to  DL5. INSTALL a new CHT sensor.
    REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.
  5. DL5 CHECK THE CIRCUIT FROM THE MODULE TO THE COMPONENT 
    NOTE: Refer to RESISTANCE REFERENCE CHART  for the resistance specifications.
    • CHT Sensor connector connected.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the CHT (VOLT) PID.
    • Using the data collected from the previous step, compare temperature resistance measured at the sensor to the PID temperature voltage measured at the PCM.

    Does the measured value at the sensor agree with measured PID value at the PCM? 

    Yes No
    The concern is elsewhere. RETURN to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX , for further direction. GO to  DL12.
  6. DL6 CHECK THE CHT SENSOR OPERATION 
    • Run the engine until the engine temperature stabilizes.
    • Verify the radiator hoses are hot and the cooling system is pressurized.
    • Carry out the PCM self-test.

    Is DTC P1288 present? 

    Yes No
    GO to  DL7. The engine temperature was not stabilized. REPAIR any other DTCs as necessary.
  7. DL7 CHECK THE RESISTANCE OF THE CHT SENSOR 
    NOTE: Refer to the RESISTANCE REFERENCE CHART  for the resistance specifications.
    • The vehicle must be at normal operating temperature.
    • Ignition OFF.
    • CHT Sensor connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Component Side (-) CHT Sensor Connector, Component Side
      CHT SIGRTN

    Is the resistance within specification? 

    Yes No
    GO to  DL31. INSTALL a new CHT sensor.
    REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.
  8. DL8 DTCS P1289 OR P1290: ACCESS THE CHT PID AND CHECK THE VOLTAGE 
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the CHT (VOLT) PID.

    Is the voltage less than 0.2 V? 

    Yes No
    GO to  DL9. GO to  DL10.
  9. DL9 CHECK FOR A GROUNDED CIRCUIT 
    • CHT Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the CHT (VOLT) PID.

    Is the voltage greater than 4.6 V? 

    Yes No
    INSTALL a new CHT sensor.
    REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DL14.
  10. DL10 CHECK THE CHT CIRCUIT FOR A SHORT TO VOLTAGE 
    • CHT Sensor connector disconnected.
    • Ignition ON, engine OFF.
    • Measure the voltage between:
      VOLTAGE REFERENCE CHART

      (+) CHT Sensor Connector, Harness Side (-)
      CHT Ground

    Is the voltage greater than 5.5 V? 

    Yes No
    REPAIR the short circuit. CHECK the CHT sensor for damage.
    GO to  DL11.    		 GO to  DL11.
  11. DL11 CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF 
    NOTE: Refer to the RESISTANCE REFERENCE CHART  for the resistance specifications.
    • Ignition OFF.
    • CHT Sensor connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Component Side (-) CHT Sensor Connector, Component Side
      CHT SIGRTN

    Is the resistance within specification? 

    Yes No
    GO to  DL12. INSTALL a new CHT sensor. REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.
  12. DL12 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS 
    • PCM connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Harness Side (-) PCM Connector, Harness Side
      CHT CHT
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DL13. REPAIR the open circuit. Clear the PCM DTCs. REPEAT the self-test.
  13. DL13 CHECK THE SENSOR SIGNAL FOR A SHORT TO VREF 
    • Ignition OFF.
    • PCM connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Connector, Harness Side (-) PCM Connector, Harness Side
      CHT VREF

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DL31. REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  14. DL14 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND 
    • Ignition OFF.
    • PCM connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Connector, Harness Side (-) PCM Connector, Harness Side
      CHT SIGRTN
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) PCM Connector, Harness Side (-) 12 Volt Vehicle Battery
      CHT Negative terminal

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DL31. REPAIR the short circuit. Clear the PCM DTCs. REPEAT the self-test.
  15. DL15 DTCS P0119, P1289, P1290 OR P128A: INTERMITTENT CHECK 
    • Ignition ON, engine OFF.
    • Access the PCM and monitor the CHT (VOLT) PID.
    • While observing the PID, carry out the following:
      • tap on the sensor to simulate road shock
      • wiggle the sensor connector

    Is there a large change in the voltage reading? 

    Yes No
    DISCONNECT and INSPECT the connector. If OK, INSTALL a new CHT sensor. REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DL16.
  16. DL16 CHECK THE ELECTRONIC ENGINE CONTROL (EEC) WIRING HARNESS 
    • Access the PCM and monitor the CHT (VOLT) PID.
    • While observing the PID, wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM.

    Is there a large change in the voltage reading? 

    Yes No
    ISOLATE the concern.
    REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DL17.
  17. DL17 CHECK THE PCM AND VEHICLE HARNESS CONNECTORS 
    • PCM connector disconnected.
    • CHT Sensor connector disconnected.

    Are the connectors and terminals OK? 

    Yes No
    GO to  DL31. REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.
  18. DL18 SELF-TEST DTC P1285: EARLY WARNING OF ENGINE OVERHEAT CONDITION 
    WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
    NOTE: If the electric cooling fan does not operate, return to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for electric cooling fan DTC. Return to NO DIAGNOSTIC TROUBLE CODES (DTCS) PRESENT SYMPTOM CHART INDEX for symptom diagnosis.
    • An engine overheat condition is sensed by the CHT sensor.
    • Check the cooling system for:
      • correct coolant level
      • internal or external coolant leaks
      • blockage of the radiator
      • cooling fan operation

    Is the cooling system OK? 

    Yes No
    GO to  DL19. REFER to the appropriate Engine Cooling article for loss of coolant diagnosis.
    Clear the PCM DTCs. REPEAT the self-test.
  19. DL19 CHECK THE OPERATION OF THE CYLINDER HEAD TEMPERATURE SENSOR 
    • Run the engine until the engine temperature stabilizes.
    • Verify the radiator hoses are hot and the cooling system is pressurized.
    • Carry out the PCM self-test.

    Is DTC P1285 present? 

    Yes No
    GO to  DL20. An engine overheat temperature was not detected. REPAIR any other DTCs as necessary.
  20. DL20 CHECK THE RESISTANCE OF THE CHT SENSOR 
    NOTE: Refer to the RESISTANCE REFERENCE CHART  for the resistance specifications.
    • The vehicle must be at normal operating temperature.
    • Ignition OFF.
    • CHT Sensor connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Component Side (-) CHT Sensor Connector, Component Side
      CHT SIGRTN

    Is the resistance within specification? 

    Yes No
    GO to  DL31. INSTALL a new CHT sensor. REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.
  21. DL21 SELF-TEST DTC P1299: INDICATES AN ENGINE OVERHEAT CONDITION 
    WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
    NOTE: Refer to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for possible causes and additional DTC description information.
    • Check the engine coolant level.

    Is the engine coolant fill level correct? 

    Yes No
    REFER to the appropriate Engine Cooling article to diagnose the engine overheating condition.
    Clear the PCM DTCs. REPEAT the self-test.    		 REFER to the appropriate Engine Cooling article, to diagnose the loss of coolant.
    Clear the PCM DTCs. REPEAT the self-test.
  22. DL22 SELF-TEST DTCS P0125 OR P0128: CHECK THE ENGINE COOLANT LEVEL 
    WARNING: TO AVOID PERSONAL INJURY DO NOT UNSCREW THE COOLANT PRESSURE RELIEF CAP WHILE THE ENGINE IS OPERATING OR HOT. THE COOLING SYSTEM IS UNDER PRESSURE. STEAM AND HOT LIQUID CAN COME OUT FORCEFULLY WHEN THE CAP IS LOOSENED SLIGHTLY. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.
    NOTE: DTC P0125 or P0128 indicates the engine coolant temperature has not achieved the required engine operation temperature level, since start-up within a specified amount of time.
    • Check the engine coolant level.

    Is the engine coolant fill level correct? 

    Yes No
    GO to  DL23. REFER to the appropriate Engine Cooling article to diagnose the loss of coolant.
    Clear the PCM DTCs. REPEAT the self-test.
  23. DL23 CHECK THE SENSOR OPERATION 
    • Run the engine until the engine temperature stabilizes.
    • Verify the radiator hoses are hot and the cooling system is pressurized.
    • Access the PCM and monitor the CHT (TEMP) PID.

    Is the temperature greater than 77°C (170.6°F)? 

    Yes No
    The test is complete.
    Clear the PCM DTCs. REPEAT the self-test.    		 REFER to the appropriate Engine Cooling article to diagnose the engine not reaching normal operating temperature.
    Clear the PCM DTCs. REPEAT the self-test.
  24. DL24 DTC P0116: CHECK THE RESISTANCE OF THE CHT SENSOR WITH THE ENGINE OFF 
    NOTE: Verify the engine temperature is at ambient room temperature before continuing with this test. A soak period of 6 hours may be required. Refer to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for information concerning P0116.
    • Ignition OFF.
    • CHT Sensor connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Component Side (-) CHT Sensor Connector, Component Side
      CHT SIGRTN
    • Refer to the RESISTANCE REFERENCE CHART  for the resistance specifications.

    Is the resistance within specification? 

    Yes No
    GO to  DL25. INSTALL a new CHT sensor. REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.
  25. DL25 DTC P0116: CHECK THE RESISTANCE OF THE CHT SENSOR 
    NOTE: Verify the engine is at operating temperature before taking the CHT reading.
    • CHT Sensor connector connected.
    • Run the engine until the engine temperature stabilizes.
    • Ignition OFF.
    • CHT Sensor connector disconnected.
    • Measure the resistance between:
      RESISTANCE REFERENCE CHART

      (+) CHT Sensor Connector, Component Side (-) CHT Sensor Connector, Component Side
      CHT SIGRTN
    • Refer to the RESISTANCE REFERENCE CHART  for the resistance specifications.

    Is the resistance within specification? 

    Yes No
    The concern is not present at this time. CARRY OUT the OBD drive cycle to determine if fuel, HO2S, catalyst and misfire monitors can be executed. REFER to ON BOARD DIAGNOSTIC (OBD) DRIVE CYCLE . REPEAT the PCM self-test if necessary. INSTALL a new CHT sensor. REFER to the appropriate Electronic Engine Controls article .
    Clear the PCM DTCs. REPEAT the self-test.
  26. DL26 DTC P0298: ENGINE OIL OVER TEMPERATURE CONDITION 
    NOTE: The engine oil temperature protection strategy in the PCM has been activated. This protects the engine against mechanical damage due to overheating. Refer to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS for possible causes and additional DTC description information.
    • Check for an overheating condition and base engine concerns.

    Are there any overheating or base engine concerns? 

    Yes No
    ISOLATE the concern. REPAIR as necessary.
    Clear the PCM DTCs. REPEAT the self-test.    		 GO to  DL27.
  27. DL27 CHECK FOR CHT DTCS 
    • Carry out the PCM self-test.

    Are DTCs P1285, P1288, P1289 or P1299 present? 

    Yes No
    DISREGARD the engine oil temperature (EOT) DTC at this time. ADDRESS the next DTC. GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS . GO to  DL28.
  28. DL28 ROAD TEST THE VEHICLE AND MONITOR FOR ENGINE OVER TEMPERATURE 
    • Access the freeze frame data (if available) and record the DTC conditions.
    • Access the PCM and monitor the CHT (TEMP) PID.
    • Test drive the vehicle and allow the engine to reach normal operating temperature.
    • Observe CHT PID.

    Does the engine overheat? 

    Yes No
    REFER to the appropriate Engine Cooling article to diagnose the overheat symptom.
    Clear the PCM DTCs. REPEAT the self-test.    		 Unable to duplicate or identify the concern at this time.
  29. DL29 ENGINE TEMPERATURE WARNING INDICATOR LAMP ON OR TEMPERATURE GAUGE INDICATES HOT, BUT ENGINE IS NOT OVERHEATING 
    NOTE: The PCM self-test must be carried out prior to entering this pinpoint test.

    Was the PCM self-test carried out prior to entering this pinpoint test? 

    Yes No
    GO to  DL30. The concern is elsewhere. RETURN to PINPOINT TEST QT for further direction.
  30. DL30 ENGINE TEMPERATURE INDICATOR LAMP ON OR TEMPERATURE GAUGE INDICATES HOT WITH NO DTCS 
    NOTE: The engine temperature warning indicator (gauge or lamp) is a warning system that gives the driver information during an engine overheating condition. The PCM monitors the CHT sensor and determines if fail-safe cooling mode is needed. If fail-safe cooling mode is needed, the PCM sends a controller area network (CAN) message to the instrument cluster to signal an overheating condition. This causes the instrument cluster indicator to illuminate and forces the temperature gauge to the H (hot) zone. DTC P1285 is stored in the PCM.
    NOTE: For Engine Temperature Warning Indicator system problems, refer to the appropriate Instrumentation, Message Center, and Warning Chimes article.
    • PCM connector disconnected.
    • Ignition ON, engine OFF.

    Does the engine temperature warning indicator lamp turn OFF (prove out) and/or the temperature gauge return to the normal zone with the PCM disconnected? 

    Yes No
    REFER to the appropriate Engine Cooling article to diagnose the overheat symptom.
    Clear the PCM DTCs. REPEAT the self-test.    		 REFER to the appropriate Instrumentation, Message Center, and Warning Chimes article to diagnose the incorrect temperature gauge.
    Clear the PCM DTCs. REPEAT the self-test.
  31. DL31 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test.
    • Verify the concern is still present.

    Is the concern still present? 

    Yes No
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , PROGRAMMING THE VID BLOCK FOR A REPLACEMENT PCM . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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