The engine oil temperature (EOT) sensor is a variable resistor. The EOT sensor measures the temperature of the engine oil. Monitoring the engine oil temperature input is necessary for optimal control of the cam phasers. The oil temperature is monitored from dual function oil level switch and temperature sensor located in the oil pan. The EOT sensor has a signal circuit and a low reference circuit. The engine control module (ECM) supplies bias 5 volts on the EOT signal circuit, and a ground for the EOT low reference circuit. When the EOT sensor is cold, the sensor resistance is high. When the engine oil temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a high voltage on the EOT signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the EOT signal circuit.

Cold Start Fail Test

At start-up, after a 10 hour engine soak time, the EOT is greater than 30°C (54°F) higher or lower than the ECT sensor, and the difference between start-up temperature for the ECT and IAT is less than 16°C (29°F).

OR

The difference between start-up EOT and the start-up ECT is greater than 16°C (29°F) or the difference between the start-up EOT and the start-up IAT is greater than 16°C (29°F).

Continuous Fail Test

The difference between the calculated oil temperature and the actual oil temperature is greater than 40°C (72°F).

DTC P0196 is a Type B DTC.

DTC P0196 is a Type B DTC.

Schematic Reference

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

1. If DTC P0112, P0113, P0116, P0117, P0118, P0197, or P0198 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
2. Ignition ON, observe the scan tool Engine Oil Temperature Calculated and the Engine Oil Temperature Sensor parameters. The readings should be within 30°C (54°F) of each other.

Important: Perform the following verification procedure only if the ignition has been OFF for 10 hours or more.

3. Ignition ON, observe the scan tool IAT Sensor, ECT Sensor, and Engine Oil Temperature Sensor parameters. The readings should be within 15°C (27°F) of each other and also the ambient temperature.
4. Engine running, observe the DTC information with a scan tool. DTC P0196 should not set.
5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Important: You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
2. Test for less than 5 ohms of resistance between the low reference circuit terminal B and ground.

⇒	If greater than the specified range, test the low reference circuit for high resistance. If the circuit tests normal, replace the ECM.

3. Disconnect the harness connector at the EOT sensor.
4. Test for less than 5 ohms of resistance between the low reference circuit terminal C and ground.

⇒	If greater than the specified range, test the low reference circuit for high resistance. If the circuit tests normal, replace the ECM.

5. Disconnect the harness connector at the ECM.
6. Test for less than 5 ohms of resistance between the IAT signal circuit terminal A and the corresponding terminal C2-67 at the ECM.

⇒	If greater than the specified range, repair the high resistance on the signal circuit.

7. Test for less than 5 ohms of resistance between the EOT signal circuit terminal B and the corresponding terminal C2-65 at the ECM.

⇒	If greater than the specified range, repair the high resistance on the signal circuit.

8. If all circuits test normal, test the IAT sensor. Refer to Component Testing.

⇒	If the IAT sensor tests normal, replace the engine oil level sensor and/or switch assembly.

Compare the resistance of the IAT sensor to the temperature vs resistance table.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.