Circuit / System Description

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 K20 Engine Control Module / K45 Powertrain Control Module supplies 5 V to the engine oil pressure sensor via the 5 V reference circuit and provides ground via the low reference circuit. The K20 Engine Control Module / K45 Powertrain Control Module 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 K20 Engine Control Module / K45 Powertrain Control Module senses a high signal voltage. When the engine oil pressure is low, the engine oil pressure sensor voltage is low and the K20 Engine Control Module / K45 Powertrain Control Module senses a low signal voltage. The K20 Engine Control Module / K45 Powertrain Control Module sends the engine oil pressure information to the A11 Radio via serial data. When commanded by the A11 Radio, the driver information display will illuminate or display the engine oil pressure indicator when the engine oil pressure is low.