LEMON Manuals: Even more car manuals for everyone
Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2196 (Engine Controls - Pinpoint Test DY: Engine Oil Temperature (EOT) Sensor Through Pinpoint Test Hf: Catalyst Efficiency Monitor And Exhaust Systems - (Except Diesel & Hybrid)) >> Pinpoint Test DY: Engine Oil Temperature (EOT) Sensor >> Test Procedure

Test Procedure

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
  1. DY1 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 upper radiator hose is hot and the cooling system is pressurized.
    • Carry out the self-test.

    Are DTCs P0196 or P1184 present? 

    Yes No
    GO to  DY2. The engine temperature was not stabilized.
    REPAIR any other DTCs as necessary.
  2. DY2 DTCS P0196, P0197, P0198, P1184 OR P0298: CHECK THE TEMPERATURE SENSOR SIGNAL 
    • Key in ON position.
    • Access the PCM and monitor the EOT_V PID.

    Is the voltage less than 0.3 V? 

    Yes No
    GO to  DY3. GO to  DY5.
  3. DY3 SIMULATE AN OPPOSITE SIGNAL TO THE PCM 
    • Key in ON position.
    • 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. GO to  DY4.
  4. DY4 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
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . REPAIR the short circuit.
  5. DY5 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  DY6. GO to  DY10.
  6. DY6 CHECK THE EOT CIRCUIT VOLTAGE 
    • EOT Sensor connector disconnected.
    • Key in ON position.
    • 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
    Key in OFF position.
    GO to  DY7.    		 Key in OFF position.
    GO to  DY9.
  7. DY7 CHECK THE RESISTANCE OF THE EOT SENSOR WITH THE ENGINE OFF 
    • EOT Sensor connector disconnected.
    • Measure the resistance between:
      (+) EOT Sensor Connector, Component Side (-) EOT Sensor Connector, Component Side
      EOT SIGRTN
    • Refer to the TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS  chart at the beginning of this test for resistance specifications.

    Is the resistance within specification? 

    Yes No
    GO to  DY8. INSTALL a new EOT sensor.
  8. DY8 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
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . REPAIR the short circuit.
  9. DY9 CHECK THE SIGNAL AND SIGRTN CIRCUITS FOR AN OPEN IN THE HARNESS 
    • 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
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . REPAIR the open circuit.
  10. DY10 INTERMITTENT CHECK 
    • Key in ON position.
    • 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
    Key in OFF position.
    DISCONNECT and INSPECT the connector.
    If OK, INSTALL a new EOT sensor.    		 GO to  DY11.
  11. DY11 CHECK THE ELECTRONIC ENGINE CONTROL (EC) WIRING HARNESS 
    • Access the PCM and monitor the EOT_V PID.
    • While observing the PID, carry out the following:
      • 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 fault
    REPAIR as necessary.    		 GO to  DY12.
  12. DY12 CHECK THE RESISTANCE OF THE EOT SENSOR WITH THE ENGINE RUNNING 
    • Run the engine until the engine temperature stabilizes.
    • Verify the upper radiator hose is hot and the cooling system is pressurized.
    • Measure the resistance between:
      (+) EOT Sensor Connector, Component Side (-) EOT Sensor Connector, Component Side
      EOT SIGRTN
    • REFER to TEMPERATURE SENSOR VOLTAGE AND RESISTANCE SPECIFICATIONS  at the beginning of this test for resistance specifications.

    Is the resistance within specification for the given engine temperature? 

    Yes No
    The fault is not present at this time
    GO to PINPOINT TEST Z STEP 1 .    		 INSTALL a new EOT sensor.
  13. DY13 DTC P0298: ENGINE OIL OVER TEMPERATURE CONDITION 
    • Engine oil temperature protection strategy in the PCM has been activated.
      • CHECK for an overheating condition and base engine concerns.

    Are there any overheating or base engine concerns? 

    Yes No
    ISOLATE the fault.
    REPAIR as necessary.
    REFER to the ENGINE COOLING for cooling system diagnostics.    		 GO to  DY14.
  14. DY14 CHECK FOR EOT SENSOR HARDWARE 
    • 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  DY2. GO to  DY15.
  15. DY15 IDENTIFY THE CUSTOMER'S DRIVING HABITS 
    • Identify the customers driving habits.
    • Access the Freeze Frame Data (if available) and record the DTC malfunction conditions.

    Does the vehicle appear to have been driven in a improper 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. GO to  DY16.
  16. DY16 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 25 . GO to PINPOINT TEST DX STEP 21 .
scientia non olet · About LEMON Manuals