Engine Oil Level/Oil Life Monitor Diagnosis
Circuit Description
The Oil Level sensor is a normally open switch. When the engine oil level drops below a predetermined amount, the switch will close. The PCM will then send a message (via class 2) to the BCM indicating that a low oil condition is present. The Driver Information Center then displays Low Oil Level.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Important: This table assumes that the oil level is at the proper level or the oil level was low and the Low Oil Level message never was displayed. Check for BCM DTCs for the Driver Information Center. Is the voltage at the specified value? | B+ | ||
3 | Measure the voltage at the A terminal to the B terminal of the Oil Level sensor electrical connector using the DMM J 39200 . Is the voltage at the specified value? | B+ | ||
4 |
Does the DMM indicate continuity? | -- | ||
5 | Probe the Oil Level sensor input circuit using a test lamp connected to B+. Does the test lamp illuminate? | |||
6 |
Did you find and correct the condition? | -- | System OK | |
7 | Repair the open ground circuit. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | System OK | -- |
8 | Repair the open signal circuit. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | System OK | -- |
9 | Repair the signal circuit for a ground. Refer to Body and Accessories/Wiring Systems. Is the action complete? | -- | System OK | -- |
10 |
Did you find and correct the condition? | -- | System OK | |
11 |
Important: Program the replacement PCM. Refer to Powertrain Control Module/Throttle Actuator Control Module Replacement . Replace the PCM. Is the action complete? | -- | System OK | -- |
12 | Replace the Oil Level sensor. Refer to Engine/Engine Mechanical. Is the action complete? | System OK | -- |
Engine Oil Level/Oil Life Monitor Reset Procedure
Description
The Oil Life Monitor is used to inform the driver when the next service interval is required. In order to determine when the next oil change is needed the PCM monitors the following:
| • | Distance the vehicle has traveled |
| • | Vehicle Speed |
| • | Engine Load |
| • | Engine Coolant Temperature |
| • | Engine Revolutions |
When the PCM determines that an oil change is needed, the PCM will send a message to the BCM via class 2. Then a Change Oil Now message will appear on the Driver Information Center.
A scan tool can be used to monitor the Oil Life Monitor. The scan tool displays the amount of oil life in percentage.
Important: Repair any TP or APP sensor DTCs before proceeding with the reset procedure.
Resetting The Oil Life Monitor
- Turn On the ignition leaving the engine OFF.
- Cycle the Accelerator Pedal from a closed throttle to a wide open throttle (WOT) 3 times within 5 seconds.
- Change the engine oil and the oil filter.
