P0196

P0196-ENGINE OIL TEMPERATURE SENSOR CIRCUIT PLAUSIBILITY AFTER COOLDOWN





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the ignition on.

- Set Condition:
The ECM detects an invalid Oil Temperature Sensor Signal.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.Initial Inspection and Diagnostic Overview

DIAGNOSTIC TEST

1. DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, clear DTC's in the engine control module (ECM).
Monitor the scan tool for at least two minutes.
Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.
Start the engine.
Allow the engine to reach normal operating temperature.
With the scan tool, select view DTC's.
Is the status active for this DTC?

Yes

- Go To 2

No

- Perform the ECM Verification Test Ver. 1. Verification Tests

2. (G224) OIL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND




Turn the ignition off.
Disconnect the Engine Control Module (ECM) harness connector.
Measure the resistance between ground and the (G224) Oil Temperature Sensor Signal circuit in the Oil Temperature Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Go To 3

No

- Repair the (G224) Oil Temperature Sensor Signal circuit for a short to ground.
- Perform the ECM Verification Test Ver. 1. Verification Tests

3. (G224) OIL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO (Z36) OIL TEMPERATURE SENSOR GROUND CIRCUIT




Measure the resistance between the (G224) Oil Temperature Sensor signal circuit and the (Z36) Oil Temperature Sensor ground circuit in the Oil Temperature Sensor harness connector.
Is the resistance above 1000 ohms?

Yes

- Go To 4

No

- Repair the (G224) Oil Temperature Sensor Signal circuit for a short to the (Z36) Oil Temperature Sensor Ground circuit.
- Perform the ECM Verification Test Ver. 1. Verification Tests

4. (G224) OIL TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE




Measure the resistance of the (G224) Oil Temperature Sensor Signal circuit between the Oil Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

- GO TO 5

No

- Repair the (G224) Oil Temperature Sensor Signal circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests

5. (Z36) OIL TEMPERATURE SENSOR GROUND CIRCUIT OPEN CIRCUIT OR HIGH RESISTANCE




Measure the resistance of the (Z36) Oil Temperature Sensor Ground circuit between the Oil Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

- GO TO 6

No

- Repair the (Z36) Oil Temperature Sensor Ground circuit for an open circuit or high resistance.
- Perform the ECM Verification Test Ver. 1. Verification Tests

6. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oil Temperature Sensor and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Refer to any technical service bulletins that may apply.
Were any problems found?

Yes

- Repair as necessary.
- Perform the ECM Verification Test Ver. 1. Verification Tests

No

- Replace the Engine Control Module (ECM).
- Perform the ECM Verification Test Ver. 1. Verification Tests