Circuit Description
When the engine oil level is in the normal range, the engine oil level switch is a closed switch and the engine oil level switch signal is low.
When a low engine oil level condition is present, the engine oil level switch is an open switch and the engine oil level switch signal is high. The instrument panel cluster (IPC) receives a class 2 message from the powertrain control module (PCM) requesting illumination of the CHECK ENG OIL LEVEL indicator.
Low Engine Oil Level Indicator Always On
| Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Instrument Cluster Schematics | ||||
| 1 | Did you perform the Instrument Cluster Diagnostic System Check? | - | Go to Step 2 | Go to Diagnostic System Check - Instrument Cluster |
| 2 | Turn ON the ignition, with the engine OFF. Does the low engine oil level indicator display in the message center? |
- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
| 3 |
|
- | Go to Step 9 | Go to Step 4 |
| 4 |
|
- | Go to Step 6 | Go to Step 5 |
| 5 | Test the signal circuit of the engine oil level switch for an open or a high resistance. Refer to Circuit Testing
, and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 12 | Go to Step 8 |
| 6 | Test the ground circuit of the engine oil level switch for an open or a high resistance. Refer to Circuit Testing
, and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 12 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the engine oil level switch. Refer to Testing for Intermittent Conditions and Poor Connections
, and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 12 | Go to Step 10 |
| 8 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections
, and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 12 | Go to Step 11 |
| 9 | Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement . Did you complete the replacement? |
- | Go to Step 12 | - |
| 10 | Replace the engine oil level switch. Refer to Engine Oil Level Sensor Replacement . Did you complete the replacement? |
- | Go to Step 12 | - |
| 11 |
IMPORTANT:
Replace the PCM. Refer to:Program the replacement PCM.
|
- | Go to Step 12 | - |
| 12 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 3 |