Code 52, Low Engine Oil Temperature: Notes

Engine oil temperature sensor is a thermistor, similar to a coolant or air temperature sensor. When engine oil temperature is cold, sensor resistance is high and PCM will see a high monitored voltage signal on engine oil temperature sensor signal terminal. As temperature increases, resistance decreases and PCM sees a lower monitored voltage on circuit.

1. Code 52 will set if engine oil temperature sensor indicates less than -31°F (-35°C) and engine has been running for more than 30 minutes.
2. Code 52 will set when open occurs in sensor, wire or connection. This determines if PCM and wiring are okay.
3. Determines if engine oil temperature signal or sensor ground circuit is open.