P0196 Engine Oil Temperature Sensor Circuit Performance
August 02, 2017
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P0196 code - The Engine Oil Temperature (EOT) sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module (PCM) supplies a 5-volt reference and ground to the sensors low reference signal circuit. When the oil temperature is low, the sensor resistance is high. When the oil temperature is high, the sensor resistance is low. When monitored, enable conditions (engine off time greater than 480 minutes), test conditions (DTC P0071, P0116, P1115 are not active, vehicle speed above 30 mph, ambient temperature, intake air temperature, and coolan temperature are all above -64°C (-83.2°F). Set conditions, the difference between the Engine Oil Temperature (EOT) sensor value and either the AAT sensor or ECT sensor value is greater than 15°C (59°F). Default actions, the MIL light will illuminate.
Possible causes:
Step 2. Check for high resistance in the EOT signal circuit
Ignition off.
Step 3. Check for high resistance in the sensor ground circuit
Step 4. Engine Oil Temperature sensor
Possible causes:
- High resistance in the EOT signal circuit.
- High resistance in the sensor ground circuit.
- Engine Oil Temperature sensor.
- Powertrain Control Module (PCM).
Diagnostic test P0196 code
Step 1. Check for an active condition
Turn the ignition off. Allow the vehicle to sit with the ignition off an environment where the temperature is consistent and above -7°C (19.4°F) until the engine coolant temperature is equal to ambient temperature. Turn the igntion on, with the scan tool, compare the EOT sensor value to the AAT and ECT sensor values.
Is the EOT sensor value within 15°C (69°F) of the other sensor values?
Yes, perform the PCM intermittent condition.
No, go to step 2.
Step 2. Check for high resistance in the EOT signal circuit
Ignition off.
Disconnect the EOT sensor harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the EOT signal circuit between the EOT sensor harness connector and the PCM harness conenctor.
Disconnect the PCM harness connector.
Measure the resistance of the EOT signal circuit between the EOT sensor harness connector and the PCM harness conenctor.
Is the resistance below 3.0 Ohms?
Yes, go to step 3.
No, repair the EOT signal circuit for high resistance.
Step 3. Check for high resistance in the sensor ground circuit
Measure the resistance of the sensor ground circuit between the EOT sensor harness connector and PCM harness connector.
Is the resistance below 3.0 Ohms?
Yes, go to step 4.
No, repair the sensor ground signal circuit for high resistance.
Step 4. Engine Oil Temperature sensor
Reconnect the PCM harness connector.
Turn the ignition on, with the scan tool, read the EOT sensor voltage. The sensor voltage should be approximately 5.0 volts (plus or minus 1 volt) with the connector disconnected.
Connect a jumper between the EOT signal circuit and the sensor ground circuit at the EOT sensor harness connector. The sensor voltage should be approximately 0.0 volts (plus or minus 1 volt) with the jumper in place.
Does the scan tool display the voltage as described above?
Yes, replace the Engine Oil Temperature sensor if no problems were found with the connectors.
No, go to step 5.
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