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Test Db: Engine Oil Temperature Sensor: Testing

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NOTE: Proceed to DTC testing steps listed in FAULT CODE SETTING CONDITION  table of fault code setting condition.
FAULT CODE SETTING CONDITION

Fault Code KOEO KOER Continuous Memory
P0197 1   DB4    DB6
P0198 1   DB1    DB6
P1184    DB9  
(1)
For Federal emission models Malfunction Indicator Lamp (MIL) illuminates when fault is detected.
    NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  1. 1) KOEO DTC P0198: Check SIG RTN For Open Circuit
    DTC P0198 is set when EOT sensor circuit input voltage is out of range (high). The following are possible causes for this fault:
    • Faulty Sensor
    • Faulty Harness Or Connector
    • Faulty PCM

    Disconnect EOT sensor connector. Sensor is located on top of engine near rear of generator. See Figure or Figure . Using DVOM, measure resistance between chassis ground and terminal No. 2 (Gray/Red wire) at EOT sensor harness connector. See Figure. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, locate and repair open in Gray/Red wire. Clear DTCs and retest.

  2. 2) Induce Opposite Failure

    Turn ignition on. Connect a jumper wire between EOT sensor harness connector terminals. Check for DTCs. If DTC P0197 is not present, go to next step. If DTC P0197 is present, replace EOT sensor. Clear DTCs and retest.

  3. 3) Check Continuity Of Sensor Signal Circuit

    Turn ignition off. Disconnect jumper wire. Disconnect PCM connector and inspect for damaged pins, corrosion and loose wires. PCM is located in left rear of engine compartment, near brake master cylinder. Repair connector as necessary. Install Rotunda Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure resistance between EOT sensor harness connector terminal No. 1 (Light Green/Red wire) and test pin No. 38 at breakout box. If resistance is less than 5 ohms, replace PCM. Clear DTCs and retest. If resistance is 5 ohms or more, locate and repair open circuit in Light Green/Red wire. Clear DTCs and retest.
    4. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  4. 4) KOEO DTC P0197: Induce Opposite Failure
    DTC P0197 is set when EOT sensor circuit input voltage is out of range (low). The following are possible causes for this fault:
    • Circuit Grounded In Wiring Harness
    • Faulty Sensor
    • Faulty Harness Connector
    • Faulty Powertrain Control Module (PCM)

    Disconnect EOT sensor connector. Sensor is located on top of engine near rear of generator. See Figure or Figure . Perform KOEO ON-DEMAND SELF-TEST  under QUICK TEST. If DTC P0198 is not present, go to next step. If DTC P0198 is present, replace EOT sensor. Clear DTCs and retest.

  5. 5) Check EOT Sensor Signal Circuit For Short To Ground

    Turn ignition off. Disconnect PCM connector and inspect for damaged pins, corrosion and loose wires. PCM is located in left rear of engine compartment, near brake master cylinder. Repair connector as necessary. Install Rotunda Breakout Box (014-00950), leaving PCM disconnected. Using DVOM, measure resistance between test pin No. 38 and test pins No. 25, 51, 76 (Econoline), 77, 91 and 103 at breakout box. If all resistances are more than 10 k/ohms, replace PCM. Clear DTCs and retest. If any resistance is 10 k/ohms or less, locate and repair short to ground in wiring harness. Clear DTCs and retest.
    6. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  6. 6) Continuous Memory DTC P0197 Or P0198: Check For Intermittent Faults
    DTCs P0197 and/or P0198 are set when EOT sensor signal circuit was out of range (low or high). These DTCs are generated under normal driving conditions. Possible causes are:
    • Faulty Sensor
    • Faulty Sensor Connector
    • Open Or Grounded Circuit In Harness
    • Faulty Powertrain Control Module (PCM)

    Ensure scan tool is connected to DLC. Turn ignition on. Using scan tool, access EOT PID from PID/DATA MONITOR & RECORD menu. While observing scan tool, tap on EOT sensor to simulate road shock. Wiggle EOT sensor connector. If EOT PID value defaults to 212°F (100°C), go to step  8). If EOT PID value does not default to 212°F (100°C), go to next step.

  7. 7) Check Wiring Harness

    Using scan tool, access EOT PID from PID/DATA MONITOR & RECORD menu. While observing EOT PID, wiggle and bend small sections of wiring harness starting at EOT sensor and working toward PCM. If EOT PID value defaults to 212°F (100°C), isolate fault and repair as necessary. If EOT PID value does not default to 212°F (100°C), go to next step.

  8. 8) Check PCM & Vehicle Harness Connectors

    Turn ignition off. Disconnect EOT and PCM connectors. Inspect connectors for damaged pins, corrosion and loose wires. If connectors and terminals are damaged, repair as necessary. Clear DTCs and retest. If connectors and terminals are okay, fault cannot be duplicated at this time and testing is complete. Clear DTCs and retest.
    9. NOTE: For additional testing information, see DIAGNOSTIC AIDS .

  9. 9) KOER DTC P1184: Warm Engine
    DTC P1184 is set when engine oil temperature is not warm enough to perform KOER CYLINDER CONTRIBUTION SELF-TEST. Engine oil temperature must be 68-242°F (20-117°C) or sensor voltage must be .53-3.82 volts or DTC P1184 will set. The following are possible causes for this fault:
    • Engine Not At Normal Operating Temperature
    • Low Oil Level
    • Faulty Cooling System
    • Faulty EOT Sensor
    • Faulty Thermostat
    • Faulty EOT Sensor Circuit

    Verify no KOEO DTCs are present. Drive vehicle or operate engine until engine is at normal operating temperature. Perform KOER CYLINDER CONTRIBUTION SELF-TEST  under QUICK TEST. If DTC P1184 is present, go to next step. If DTC P1184 is not present, repair any other DTCs that are present. Clear DTCs and repeat QUICK TEST .

  10. 10) Check EOT Sensor

    Ensure scan tool is connected to DLC. Turn ignition on. Using scan tool, access EOT PID from PID/DATA MONITOR & RECORD menu. While observing EOT PID, tap on sensor to simulate road shock. If EOT PID value fluctuates or changes to less than 68°F (20°C), or more than 3.82 volts, replace EOT sensor. Clear DTCs and retest. If EOT PID value does not fluctuate or change to less than 68°F (20°C), or more than 3.82 volts, go to next step.

  11. 11) Check Wiring Harness

    While observing EOT PID, wiggle and bend small sections of EOT sensor wiring harness starting at EOT sensor and working toward PCM. If EOT PID value fluctuates, isolate fault and repair as necessary. Clear DTCs and retest. If EOT PID value does not fluctuate, go to next step.

  12. 12) Check PCM & Vehicle Harness Connectors

    Turn ignition off. Disconnect PCM and EOT sensor connectors. PCM is located in left rear of engine compartment, near brake master cylinder. EOT sensor is located on top of engine near rear of generator. See Figure or Figure . Inspect connectors for damaged pins, corrosion and loose wires. If connectors and terminals are damaged, repair as necessary. Clear DTCs and retest. If connectors and terminals are okay, fault cannot be duplicated at this time and testing is complete. Clear DTCs and retest.
    13. NOTE: Perform test steps 13)  and 14)  when directed here from RUNS ROUGH, MISSES, BUCKS OR JERKS, HESITATION, STUMBLES, SURGES (ON ACCELERATION OR CRUISE), LACK OR LOSS OF POWER, OR POOR FUEL ECONOMY symptom under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - DIESEL article.

  13. 13) Check For Biased EOT Sensor
    Allow vehicle to sit overnight. Connect scan tool to Data Link Connector (DLC). DO NOT start engine. Using scan tool, access EOT and IAT PIDs. Turn ignition on. If EOT and IAT PIDs are within plus or minus 11°F (6°C) of each other, go to next step. If EOT and IAT PIDs are not within plus or minus 11°F (6°C) of each other, verify wiring harness and connectors are okay. If wiring and connectors are okay, replace EOT sensor.

  14. 14) EOT Sensor Rationality Check

    Start engine and warm 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. Using scan tool or DVOM, measure EOT voltage. Compare EOT sensor voltage to temperature readings in EOT SENSOR SPECIFICATIONS  table. If temperature readings between EOT SENSOR SPECIFICATIONS table and thermometer agree within plus or minus 5.4°F (3°C), verify performance concern. Return to SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - EEC-V - DIESEL article. If temperature readings between EOT SENSOR SPECIFICATIONS table and thermometer agree within plus or minus 5.4°F (3°C), verify wiring harness and connectors are okay. If wiring and connectors are okay, replace EOT sensor.
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