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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1797 (Engine Controls - Pinpoint Test DX: Engine Coolant Temperature (ECT) Sensor Through Engine Controls - Pinpoint Test He: Exhaust Gas RECIRCULATION (EGR) Systems - (Except Diesel & Hybrid)) >> Pinpoint Test DY: Engine Oil Temperature (EOT) Sensor >> Test Procedure

Test Procedure

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  1. DY1 CHECK FOR DTCS 

    Are DTCs P0196, P0197, P0198, P0298, or P1184 present? 

    Yes No
    For DTCs P0196 or P1184, GO to  DY2.
    For DTCs P0197 or P0198, GO to  DY3.
    For continuous memory DTC P0298, GO to  DY14.    		 For all others, GO to DIAGNOSTIC TROUBLE CODE (DTC) CHARTS AND DESCRIPTIONS .
  2. DY2 DTCS P0196 OR P1184: CHECK THE EOT SENSOR OPERATION 
    NOTE: Before continuing with this pinpoint test, verify the engine oil condition and level are within specification.
    • Run the engine until the engine temperature stabilizes.
    • Verify the radiator hoses are hot and the cooling system is pressurized.
    • Carry out the self-test.

    Are DTCs P0196 or P1184 present? 

    Yes No
    GO to  DY3. The engine temperature was not stabilized. REPAIR any other DTCs as necessary.
  3. DY3 DTCS P0196, P0197, P0198, P1184 OR P0298: CHECK THE TEMPERATURE SENSOR SIGNAL 
    • Key ON, engine OFF.
    • Access the PCM and monitor the EOT_V PID.

    Is the voltage less than 0.3 V? 

    Yes No
    GO to  DY4. GO to  DY6.
  4. DY4 SIMULATE AN OPPOSITE SIGNAL TO THE PCM 
    • Key ON, engine OFF.
    • EOT Sensor connector disconnected.
    • Access the PCM and monitor the EOT_V PID.

    Is the voltage greater than 4.2 V? 

    Yes No
    INSTALL a new EOT sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  DY5.
  5. DY5 CHECK THE SENSOR SIGNAL FOR A SHORT TO GROUND 
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) EOT Sensor Connector, Harness Side ( - ) EOT Sensor Connector, Harness Side
      EOT SIGRTN
    • Measure the resistance between:
      ( + ) EOT Sensor Connector, Harness Side ( - ) Vehicle Battery
      EOT Negative terminal

    Is the resistance greater than 10K ohms? 

    Yes No
    GO to  DY18. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  6. DY6 CHECK FOR HIGH EOT SENSOR VOLTAGE 
    • Access the PCM and monitor the EOT_V PID.

    Is the voltage greater than 4.2 V? 

    Yes No
    GO to  DY7. GO to  DY11.
  7. DY7 CHECK THE EOT CIRCUIT VOLTAGE 
    • EOT Sensor connector disconnected.
    • Key ON, engine OFF.
    • Measure the voltage between:
      ( + ) EOT Sensor Connector, Harness Side ( - ) EOT Sensor Connector, Harness Side
      EOT SIGRTN

    Is the voltage greater than 4.2 V? 

    Yes No
    GO to  DY8. GO to  DY10.
  8. DY8 CHECK THE RESISTANCE OF THE EOT SENSOR WITH THE ENGINE OFF 
    • Key in OFF position.
    • EOT Sensor connector disconnected.
    • Measure the resistance between:
      ( + ) EOT Sensor Connector, Component Side ( - ) EOT Sensor Connector, Component Side
      EOT SIGRTN
    • Refer to the chart at the beginning of this test for the resistance specifications.

    Is the resistance within specification? 

    Yes No
    GO to  DY9. INSTALL a new EOT sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.
  9. DY9 CHECK THE SENSOR SIGNAL CIRCUIT FOR SHORTS TO PWR 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) PCM Connector, Harness Side
      EOT VREF
      EOT VPWR

    Are the resistances greater than 10K ohms? 

    Yes No
    GO to  DY18. REPAIR the short circuit. CLEAR the DTCs.
    REPEAT the self-test.
  10. DY10 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the resistance between:
      ( + ) PCM Connector, Harness Side ( - ) EOT Sensor Connector, Harness Side
      EOT EOT
      SIGRTN SIGRTN

    Are the resistances less than 5 ohms? 

    Yes No
    GO to  DY18. REPAIR the open circuit. CLEAR the DTCs.
    REPEAT the self-test.
  11. DY11 INTERMITTENT CHECK 
    • Key ON, engine OFF.
    • Access the PCM and monitor the EOT_V 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. REPAIR as necessary. If OK, INSTALL a new EOT sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article . CLEAR the DTCs. REPEAT the self-test. GO to  DY12.
  12. DY12 CHECK THE ELECTRONIC ENGINE CONTROL (EEC) WIRING HARNESS 
    • Access the PCM and monitor the EOT_V 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. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  DY13.
  13. DY13 CHECK THE RESISTANCE OF THE EOT SENSOR WITH THE ENGINE RUNNING 
    NOTE: Refer to the chart at the beginning of this test for the resistance specifications.
    • Run the engine until the engine temperature stabilizes.
    • Verify the radiator hoses are hot and the cooling system is pressurized.
    • Measure the resistance between:
      ( + ) EOT Sensor Connector, Component Side ( - ) EOT Sensor Connector, Component Side
      EOT SIGRTN

    Is the resistance within specification for the given engine temperature? 

    Yes No
    The concern is not present at this time. INSTALL a new EOT sensor. REFER to the appropriate ELECTRONIC ENGINE CONTROLS article .
    GO to Pinpoint Test Z . CLEAR the DTCs. REPEAT the self-test.
  14. DY14 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.
    • 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. REFER to the appropriate ENGINE COOLING article for cooling system diagnosis.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  DY15.
  15. DY15 CHECK FOR EOT SENSOR HARDWARE 
    • The engine oil temperature protection strategy in the PCM can be activated with or without an EOT sensor.

    Does the vehicle have a EOT sensor? 

    Yes No
    GO to  DY3. GO to  DY16.
  16. DY16 IDENTIFY THE CUSTOMER'S DRIVING HABITS 
    • Identify the customer's driving habits.
    • Access the freeze frame data (if available) and record the DTC concern conditions.

    Does the vehicle appear to have been driven in an incorrect transmission gear or at high RPM for an extended period? 

    Yes No
    ADVISE the customer that improper transmission gear selection and high RPM for an extended period initializes the engine protection strategy.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  DY17.
  17. DY17 TYPE OF ENGINE COOLANT SENSOR 
    NOTE: When an oil temperature sensor is not present, the PCM uses an oil algorithm to infer actual temperature based on input from the engine temperature sensor.

    Is the vehicle equipped with cylinder head temperature (CHT) sensor? 

    Yes No
    GO to PINPOINT TEST DL step 26 . GO to DX22.
  18. DY18 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 and 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) . The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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