"Low Engine Oil" Message

TEST CONDITION(S)
1) EEPROM indicates an oil level switch is present.

FAILURE CONDITION(S)
1)ECM data OK (no code B334 set).
2)Coolant temp sensor data OK.
3)Change in coolant temperature since last ignition cycle is greater than 15°C.
4) Oil level input high, indicating low oil level.

ACTION TAKEN
1) Display "Low Engine Oil" message on the DIC.

DESCRIPTION
The BCM monitors the engine oil level through the oil level sensor input, pin 1D13. The oil level sensor is a magnetic switch that is closed with normal oil level and opens with low oil level. When the switch is closed, the BCM will see a low voltage on pin 1D13 and when the switch is open, it will see a high voltage. The BCM will only check for a low oil level when it "wakes up" and sees a drop in coolant temperature of at least 15°C since the end of the previous ignition cycle. This is done to assure that the oil has had a chance to drain back into the oil pan so that a correct oil level reading may be made. If these conditions are met and the oil level input is high, indicating low oil level, the BCM will send the "Low Engine Oil" message to the Driver Information Center (DIC).

DIAGNOSIS
Condition Possible Causes
Erroneous Message open in circuit 114, open in sensor, or open in circuit 1033
No Message short to ground on circuit 99 or shorted sensor