P0197 Engine Oil Temperature Sensor Circuit Low
August 02, 2017
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P0197 Engine Oil Temperature Sensor Circuit Low - The Engine Oil Temperature sensor is a variable resistor that measures the temperature of the engine oil. The Powertrain Control Module 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, with the ignition on, battery voltage greater than 10.4 volts. Set conditions, the Engine Oil Temperature (EOT) sensor circuit voltage is below the minimum acceptable calibrated threshold. Default actions, the MIL light will illuminate.
Possible causes:
Step 2. Engine Oil Temperature sensor
Step 3. Check the EOT signal circuit for a short to ground
Step 4. Check the EOT signal circuit for a short to the sensor ground circuit
When monitored, with the ignition on, battery voltage greater than 10.4 volts. Set conditions, the Engine Oil Temperature (EOT) sensor circuit voltage is below the minimum acceptable calibrated threshold. Default actions, the MIL light will illuminate.
Possible causes:
- Engine Oil Temperature signal circuit shorted to ground.
- Engine Oil Temperature signal circuit shorted to the sensor ground.
- Engine Oil Temperature sensor.
- Powertrain Control Module (PCM).
Diagnose code P0197 Engine Oil Temperature Sensor Circuit Low
Step 1. Check for an active condition
Turn the ignition on. Diagnose and repair any system voltage DTC before continuing with this test. With the scan tool, read DTC.
Is the DTC active or pending?
Yes, go to step 2.
No, perform the PCM intermittent condition.
No, perform the PCM intermittent condition.
Step 2. Engine Oil Temperature sensor
Turn the ignition off. Disconnect the EOT sensor harness connector. Turn the ignition on, with the scan tool, read DTC. The P0198 ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH DTC should be active or pending with the connector unplugged.
Does the scan tool display described above?
Yes, Verify that there is good pin to terminal contact in the Engine Oil Temperature sensor and (PCM) connectors. Replace the Engine Oil Temperature sensor if no problems were found with the connectors.
No, go to step 3.
Step 3. Check the EOT signal circuit for a short to ground
Turn the ignition off. Disconenct the PCM harness connector.
Check for continuity between ground and the EOT signal circuit at the EOT sensor harness connector.
Is there continuity between ground and the EOT signal circuit?
Yes, repair the EOT signal circuit for a short to ground.
No, go to step 4.
Step 4. Check the EOT signal circuit for a short to the sensor ground circuit
Check for continuity between the EOT signal circuit and the sensor ground circuit at the EOT sensor harness connector.
Is there continuity between the EOT signal circuit and the sensor ground circuit?
Yes, repair the short to between the EOT signal circuit and the signal sensor ground circuit.
No, go to step 5.
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