Circuit/System Description
For an overview of the component/system, refer to:Instrument Cluster Description and Operation
| Circuit | Description |
|---|---|
| 5 V Reference | Regulated voltage supplied by the control module. |
| Signal | The control module input circuit has an internal resistance connected to ground. |
| Low Reference | Grounded through the control module. |
| Component | Description |
|---|---|
| B37B Engine Oil Pressure Sensor | The sensor is a capacitive pressure transducer. Electronics in the sensor convert pressure into an analog voltage signal. |
| K20 Engine Control Module | The K20 control module monitors the B37B Engine Oil Pressure Sensor signal circuit.The control module input circuit has an internal resistance connected to ground. |
The engine oil pressure sensor changes voltage based on the engine oil pressure. The engine oil pressure sensor is a 3-wire sensor comprising of the signal circuit, the low reference circuit and the 5 V reference circuit. The engine control module (ECM) supplies 5 V to the engine oil pressure sensor via the 5 V reference circuit and provides ground via the low reference circuit. The ECM monitors the signal circuit of the engine oil pressure sensor to determine if the engine oil pressure sensor voltage is within the normal operating range of approximately 1 - 4 V. When the engine oil pressure is high, the engine oil pressure sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the engine oil pressure sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the engine oil pressure information to the P16 Instrument Panel Cluster Control Module via serial data. The P16 Instrument Panel Cluster Control Module will illuminate or display the engine oil pressure indicator when the engine oil pressure is low.