Check Oil Level

Low Oil Level Switch Circuit:

CIRCUIT DESCRIPTION:
The BCM monitors the engine oil level through the oil level sensor input, pin "1D6." 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 "1D6" 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 150°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 "CHECK OIL LEVEL" message to the DIC.

TEST CONDITION(S):
1. Ignition 1 "ON."
2. EEPROM indicates an oil level switch is present.

FAILURE CONDITION(S):
1. PCM data OK (no Code B334 set).
2. Coolant temperature sensor data OK.
3. Change in coolant temperature since last ignition cycle is greater than 150°C.
4. Oil level input high, indicating low oil level.

ACTION TAKEN:
1. Display "CHECK OIL LEVEL" message on the DIC.

DIAGNOSIS:

Condition Possible Causes

Erroneous Message Open in CKT 114, open in sensor, or open in CKT 450.

No Message Short to ground on CKT 114 or shorted sensor.