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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Engine Controls - Self-Diagnostics - 6.0L (99P F450/550) Diesel) >> System Tests >> Test L: Engine Oil Temperature Sensor >> Testing

Test L: Engine Oil Temperature Sensor: Testing

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: The Powertrain Control Module (PCM) harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause a bad connection, misdiagnosis and damaged components. Install the connector on where the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM lever to fully seat the connector.
NOTE: When the PCM engine harness connector is disconnected additional DTCs will be set. All DTCs must be cleared before returning the vehicle to service.

  1. 1) Preliminary Diagnosis For DTCs P0196, P0197, P0198, P0298 & P1184

    Perform visual inspection. Connect the scan tool. Retrieve and record any continuous and on-demand DTCs. Clear all DTCs. Perform the KOEO ON-DEMAND SELF-TEST  under QUICK TEST. Perform the KOER ON-DEMAND SELF-TEST  under QUICK TEST. Are DTCs P0196, P0197, P0198, P0298 or P1184 present? If yes, proceed as follows:
    • For P0196, go to next step.
    • For P0197, go to step  7).
    • For P0198, go to step  9).
    • For P1184, go to step  13).
    • For P0298, go to step  19).

    If no, unable to duplicate condition. Restore the vehicle. Clear DTCs and retest the system.

  2. 2) DTC P0196

    DTC P0196 indicates that an EOT sensor range/performance fault has been detected. P0196 is set when the vehicle has been driven above 1,250 RPM and 12 mg/stroke MFDES without EOT sensor signal increasing above 122°F (50°C). The time to set the fault is dependent on EOT and IAT temperatures, and can vary between approximately 15 to 45 minutes. Possible causes are:
    • Failed EOT sensor.
    • Faulty EOT sensor circuitry.
    • Faulty thermostat.
    • Faulty PCM.

    Inspect EOT sensor circuitry at sensor and PCM. Inspect for damaged, loose or pushed-out pins, loose or poorly crimped wires. Are all connectors and terminals OK? If yes, go to next step. If no, repair as necessary. Restore the vehicle. Clear DTCs and retest the system.

  3. 3) Check For EOT Sensor Fault Codes

    Perform the KOEO ON-DEMAND SELF-TEST  under QUICK TEST. Are other DTCs present? If yes, repair other DTCs before proceeding. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . Restore vehicle and retest the system. If only P0196 is present, go to next step.

  4. 4) Check EOT Sensor Operation

    Clear all DTCs. Soak vehicle at ambient temperature for at least 10 hours. Key on, engine off. Using scan tool, monitor EOT, RPM and MFDES PIDs. Record EOT sensor temperature reading. Drive vehicle above 1,800 RPM and 15 mg/stroke MFDES for at least 15 minutes. Select appropriate gear to achieve operating conditions. Does EOT temperature reading change by at least 10°F of key on value recorded? If yes, go to next step. If no, install a new EOT sensor. Restore the vehicle. Clear DTCs and retest the system.

  5. 5) Cooling System Check

    Drive vehicle an additional 15 minutes above 1,800 RPM and 15 mg/stroke. Does EOT temperature reading increase above 122°F (50°C)? If yes, go to next step. If no, check thermostat for correct operation. If fault is indicated, install a new thermostat. If thermostat fault is not present, install a new EOT sensor. Restore the vehicle. Clear DTCs and retest the system.

  6. 6) Confirm PCM Fault

    Check continuous memory DTCs. Is P0196 present? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, unable to duplicate condition. Check for loose connections, damaged or corroded pins. Wiggle harness attempting to recreate fault. Repair as necessary.

  7. 7) DTC P0197

    Possible causes are:
    • EOT signal circuit ground short.
    • Faulted EOT sensor.
    • Faulted PCM.
    • Poor EOT electrical connection.

    Key off. Disconnect EOT sensor. Check for damaged, pushed-out or corroded pins. Check for opposite failure with EOT disconnected. Perform the KOEO ON-DEMAND SELF-TEST  under QUICK TEST. Is DTC P0198 present? If yes, install a new EOT sensor. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

  8. 8) Check EOT Sensor Signal Circuit For A Short To Ground

    Disconnect the PCM engine harness connector C1381C. Measure the resistance between the EOT sensor harness connector terminal No. 2 and ground. See Figure. Is each resistance greater than 10,000 ohms? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, repair short to ground in EOT signal circuit. Restore the vehicle. Clear DTCs and retest the system.

  9. 9) DTC P0198

    Possible causes are:
    • Open in harness.
    • Open or PWR short in EOT signal circuit.
    • Open in signal return circuit.
    • Failed/poor connection.
    • Damaged EOT sensor.
    • Damaged PCM.

    Disconnect EOT sensor harness connector. Measure resistance between terminal No. 1 on the EOT connector and ground. See Figure. Is the resistance less than 0.5 ohm? If yes, go to next step. If no, repair open in signal return circuit. Restore the vehicle. Clear DTCs and retest the system.

  10. 10) Induce Opposite Failure

    Key on, engine off. Install a jumper between terminals No. 1 and 2 of the EOT sensor electrical connector. Perform the KOEO ON-DEMAND SELF-TEST  under QUICK TEST. Is DTC P0197 present? If yes, install a new EOT sensor. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

  11. 11) Check Signal Circuit For A Short To Voltage

    Key off. Disconnect the PCM engine harness connector C1381C. Key on, engine off. Measure the voltage on the EOT sensor electrical connector terminal No. 2 and ground. Is the voltage less than 0.2 volt? If yes, go to next step. If no, repair short to voltage in signal circuit. Restore the vehicle. Clear DTCs and retest the system.

  12. 12) Check Signal Circuit For An Open

    Key off. Measure the resistance between the PCM engine harness connector C1381C terminal No. 44 and the EOT sensor harness connector terminal No. 2. See CONTROL MODULE CONNECTOR IDENTIFICATION . Is the resistance less than 0.5 ohm? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, repair open signal circuit. Restore the vehicle. Clear DTCs and retest the system.

  13. 13) DTC P1184

    DTC P1184 indicates that the engine oil temperature is not warm enough to perform a KOER Cylinder Contribution Self-Test. The engine oil temperature must be greater than 68°F (20°C) (3.82 volts). Possible causes are:
    • Engine not fully warmed up.
    • Low oil level.
    • Cooling system failure.
    • Worn or damaged EOT sensor.
    • Faulty thermostat.
    • EOT sensor circuit failure.

    Verify no KOEO DTCs are present. Drive vehicle until thermostat opens. Fully warm engine. Check that upper radiator hose is hot and pressured. Rerun the KOER Cylinder Contribution Self-Test. Is DTC P1184 present? If yes, go to next step. If no, repair other DTCs as necessary. Restore the vehicle.

  14. 14) EOT Sensor Check

    Key on, engine off. Engine at normal operating temperature. Access EOT PID. Observe EOT PID while tapping on EOT sensor. Does the EOT value fluctuate or go below 68°F (20°C) (3.82 volts)? If yes, install a new EOT sensor. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

  15. 15) Vehicle Harness Check

    Observe EOT PID while carrying out the following: Grasp the vehicle harness close to the EOT sensor connector. Wiggle and shake vehicle harness while working toward PCM. Key off. Does value fluctuate? If yes, repair circuits as required. Restore the vehicle. Clear DTCs and retest the system. If no, go to next step.

  16. 16) Check PCM & Vehicle Harness Connector

    Disconnect EOT sensor and PCM harness connectors. Inspect for damaged, loose or pushed-out pins. Are connectors and terminals okay? If yes, go to next step. If no, repair as required. Restore the vehicle. Clear DTCs and retest the system.

  17. 17) Check For Biased EOT Sensor

    Allow vehicle to sit overnight. Do not start engine. Read EOT and IAT using scan tool with KOEO. Do the readings agree within 11°F (6°C)? If yes, go to next step. If no, confirm wiring is okay. If okay, install a new EOT sensor.

  18. 18) EOT Rationality Check

    Warm engine to 59-158°F (15-70°C). Remove fill/check plug from high-pressure oil pump reservoir. Measure reservoir oil temperature with an A/C thermometer. Measure EOT using WDS Tester or DVOM. Do the readings between EOT and thermometer agree within 5.4°F (3°C)? If yes, confirm performance concern. See SYSTEM & COMPONENT TESTING - 6.0L DIESEL article. If no, confirm wiring is okay. If okay, install a new EOT sensor.

  19. 19) DTC P0298

    DTC P0298 indicates that an EOT sensor range/performance fault has been detected. P0298 is set when the vehicle has been running below 1000 RPM and less than 20 mg/stroke MFDES with EOT sensor signal reading above 230°F (110°C). The time to set the fault is dependent on EOT and IAT temperatures, and can vary between approximately 15 to 45 minutes. Possible causes are:
    • Failed EOT sensor.
    • Faulty EOT sensor circuitry.
    • Cooling system fault.
    • Faulty thermostat.
    • Faulty PCM.

    Inspect EOT sensor circuitry at sensor and PCM. Inspect for damaged, loose or pushed-out pins, loose or poorly crimped wires. Are all connectors and terminals okay? If yes, go to next step. If no, repair as necessary. Restore the vehicle. Clear DTCs and retest the system.

  20. 20) Cooling System Checks

    Check coolant system for correct level. Check radiator for correct performance. Verify there are no obstructions to airflow across radiator core, and that the radiator core is not plugged. Verify correct cooling fan/clutch operation. Verify correct thermostat operation. Is coolant system okay? If yes, go to next step. If no, repair as necessary. Restore the vehicle. Clear DTCs and retest the system.

  21. 21) Check EOT Sensor Fault Codes

    Perform the KOEO ON-DEMAND SELF-TEST  under QUICK TEST. Are other DTCs present? If yes, repair other DTCs before proceeding. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . Restore vehicle and retest the system. If only P0298 is present, go to next step.

  22. 22) Check EOT Sensor Operation

    Clear continuous DTCs. Soak vehicle at ambient temperature for at least 8 hours. Key on, engine off. Using scan tool, monitor EOT PID. Is EOT sensor reading below 230°F (110°C)? If yes, go to next step. If no, install a new EOT sensor. Restore the vehicle. Clear DTCs and retest the system.

  23. 23) Confirm PCM Fault

    Run engine for approximately 15 to 20 minutes. Check continuous memory DTCs. Is DTC P0298 present? If yes, install a new PCM. Restore the vehicle. Clear DTCs and retest the system. If no, operate vehicle to verify EOT does not increase above 230°F (110°C) while running below 1,000 RPM.
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