EOT Sensor (Except For California)

DTC P0197, P0198 EOT SENSOR





Component Description





The engine oil temperature sensor is used to detect the engine oil temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.





[Reference data]






CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.




On Board Diagnosis Logic









DTC Confirmation Procedure

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
1. Start engine and wait at least 5 seconds.
2. Check 1st trip DTC.
3. If 1st trip DTC is detected, go to SEE Diagnosis Procedure.




Wiring Diagram









Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.





2. Loosen and retighten ground screws on the body. For California.
- Arrow Indicates Vehicle Front
- Body ground (1)
OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK EOT SENSOR POWER SUPPLY CIRCUIT
1. Disconnect engine oil temperature (EOT) sensor harness connector.
2. Turn ignition switch ON.





3. Check voltage between EOT sensor terminal 1 and ground with
CONSULT-III or tester.






OK or NG
OK - GO TO 3.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK EOT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 12 and ECT sensor terminal 2. Refer to Wiring Diagram.






4. Also check harness for short to ground and short to power.
OK or NG
OK - GO TO 4.
NG - Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK ENGINE OIL TEMPERATURE SENSOR
SEE Component Inspection.
OK or NG
OK - GO TO 5.
NG - Replace engine oil temperature sensor. Component.
5.CHECK INTERMITTENT INCIDENT
For California For California.
- INSPECTION END




Component Inspection

ENGINE OIL TEMPERATURE SENSOR





1. Check resistance between engine oil temperature sensor terminals 1 and 2 as shown in the figure.





[Reference data]






2. If NG, replace engine oil temperature sensor. Component.