Engine Oil Temperature Gauge Malfunction

Engine Oil Temperature Gauge Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

The auxiliary gauge module displays the engine oil temperature based on the information from the engine control module (ECM). The ECM converts the data from the engine oil temperature sensor to a engine oil temperature signal. The ECM sends the engine oil temperature signal via a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal to the auxiliary gauge module to display the engine oil temperature.

Reference Information

Schematic Reference

Instrument Cluster Schematics Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

Auxiliary Gauges Description and Operation Auxiliary Gauges Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Engine operating.

2. Verify the scan tool Engine Oil Temperature Sensor parameter is between -40 to +150°C (-40 to +302°F) and changes with engine temperature.

• If not between -38 to +148°C (-36 to +298°F) or does not change
Refer to Circuit/System Testing.

• If between -38 to +148°C (-36 to +298°F) and changes

3. All OK.

Circuit/System Testing

1. Ignition ON, perform the Auxiliary Gauge Sweep test with the scan tool, verify that the engine oil temperature gauge sweeps from its low to high position.

• If the engine oil pressure gauge does not sweep
Replace the P26 Auxiliary Gauge Module.

• If the engine oil temperature gauge does sweep

2. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B35C Engine Oil Level and Temperature Sensor. It may take up to 2 minutes for all vehicle systems to power down.

3. Test for less than 10 ohms between the low reference circuit terminal C and ground.

• If 10 ohms or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If less than 10 ohms

4. Ignition ON.

5. Verify the scan tool Engine Oil Temperature Sensor parameter is warmer than 148°C (298°F).

• If 148°C (298°F) or less

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for infinite resistance between the signal circuit terminal B and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, replace the K20 Engine Control Module.

• If warmer than 148°C (298°F)

6. Install a 3A fused jumper between the signal circuit terminal B and the low reference circuit terminal C.

7. Verify the scan tool Engine Oil Temperature Sensor parameter is colder than -38°C (-36°F).

• If -38°C (-36°F) or colder

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.

2. Test for less than 1V between the signal circuit and ground.

• If 1V or greater, repair the short to voltage on the circuit.

• If less than 1V

3. Ignition OFF.

4. Test for less than 2 ohms in the signal circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If warmer than -38°C (-36°F)

8. Test or replace the B35C Engine Oil and Temperature Sensor.

Component Testing

1. Ignition OFF, remove the B35C Engine Oil Level and Temperature Sensor.

2. Test the B35C Engine Oil Level and Temperature Sensor by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance Specifications table and verify that the resistance is within 5% of the specification.

• If not within the specified range
Replace the B35C Engine Oil Level and Temperature Sensor.

• If within the specified range

3. Temperature Sensor OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Engine Oil Level Sensor and/or Switch Replacement Service and Repair

Control Module References Control Module References for Auxiliary Gauge Module or ECM replacement, programming, and setup