"Low" Oil Pressure Telltale

Diagnostic Chart:

CIRCUIT DESCRIPTION

The BCM provides voltage to the oil pressure circuit, and the oil pressure sensor provides the single path to ground. The BCM supplies and internally monitors the voltage level of the circuit at pin 3C3. The sensor acts like a variable resistor, when the oil pressure is high, resistance is high, and the BCM will detect high voltage. As the oil pressure decreases so will the voltage level sensed by the BCM at pin 3C3. The BCM will then calculate the oil pressure by the amount of voltage present, and when the calculated oil pressure drops below 6 psi, and all other failure conditions have been met, the BCM will turn on the LOW Oil Pressure telltale on the Instrument Panle Cluster (IPC).

TEST CONDITION(S)

1. Engine has been running for at least 5 seconds.

FAILURE CONDITION(S)

1. Oil pressure less than 6 psi.

2. Engine speed greater than 600 RPM.

OR

1. Code B334 is set.

2. Oil pressure less than 6 psi.

ACTION TAKEN

1. Display the LOW Oil Pressure Telltale on the IPC.