Oil Temperature Gauge Malfunction

METER / GAUGE / DISPLAY: METER / GAUGE SYSTEM: Oil Temperature Gauge Malfunction

Oil Temperature Gauge Malfunction

DESCRIPTION

The meter CPU uses the engine oil temperature sensor to determine the temperature of the engine oil. The resistance of the engine oil temperature sensor will vary between approximately 30 kOhms or higher with the engine oil temperature is 0°C (32°F), and 0.3 kOhms with the engine oil temperature is 155°C (311°F). Voltage measured at this point will vary as the engine temperature is changed.
The engine oil temperature gauge displays the engine oil temperature using seven bars. The meter CPU calculates the engine oil temperature based on signals from the engine oil temperature sensor via the direct line. When the engine oil temperature becomes 140°C (284°F) or higher, all the bar blinks and the warning message is displayed in the multi-information display.
HINT:
- If the circuit is open, the lowest bar blinks.
- If the circuit is short, all the bar blink and oil temperature warning light comes on.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. SYSTEM CHECK
(a) Confirm the symptoms.
Result:






B -- INSPECT COMBINATION METER (OUTPUT VOLTAGE)
A -- Continue to next step.

2. INSPECT COMBINATION METER (CHECK FOR AN OPEN)
(a) Check the combination meter operation.
(1) Disconnect the E60 connector.





(2) Connect terminals 1 and 2 of the combination meter connector on the wire harness side.
(3) Turn the engine switch on (IG).
Result:






(4) Turn the engine switch off.
B -- REPLACE COMBINATION METER
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ENGINE OIL TEMPERATURE SENSOR)




(a) Disconnect the J34 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT ENGINE OIL TEMPERATURE SENSOR




(a) Remove the engine oil temperature sensor.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





HINT: Reference





NG -- REPLACE ENGINE OIL TEMPERATURE SENSOR
OK -- REPLACE COMBINATION METER
5. INSPECT COMBINATION METER (OUTPUT VOLTAGE)




(a) Disconnect the E60 engine oil temperature sensor connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:






Result:






B -- INSPECT ENGINE OIL TEMPERATURE SENSOR
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ENGINE OIL TEMPERATURE SENSOR)




(a) Disconnect the J34 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT ENGINE OIL TEMPERATURE SENSOR




(a) Remove the engine oil temperature sensor.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:





HINT: Reference





NG -- REPLACE ENGINE OIL TEMPERATURE SENSOR
OK -- REPLACE COMBINATION METER