For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Instrument Cluster Schematics . Connector End View Reference: Engine Control Module Connector End Views for the 2.8L, 3.0L, 3.2L or 3.6L engines Engine Control Module Connector End Views for the 4.6L engine.
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Start the engine. Does the LOW OIL LEVEL message display in the driver information center (DIC)? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections
3 |

1. Install a scan tool.
2. With the scan tool, observe the Engine Oil Level Switch parameter in the ECM data lists.

Does the Engine Oil Level Switch parameter display OK?

--

Go to Step 11

Go to Step 4

4 |

1. Turn the ignition OFF.
2. Disconnect the engine oil level switch.
3. Connect a 3-amp fused jumper wire between the engine oil level switch signal circuit and a good ground.
4. Start the engine.
5. With the scan tool, observe the Engine Oil Level Switch parameter.

Does the Engine Oil Level parameter display OK?

--

Go to Step 6

Go to Step 5

5 | Test the signal circuit of the engine oil level switch for an open, for a high resistance or for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 7
6 | Test the low reference circuit or the ground circuit of the engine oil level switch for an open or for a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? |  | Go to Step 12 | Go to Step 8
7 | Inspect for poor connections at the harness connector of the engine control module (ECM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 9
8 | 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 . Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 10
9 | Replace the ECM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | --
10 | Replace the engine oil level switch. Refer to the following:

• | Refer to Engine Oil Pressure Sensor and/or Switch Replacement

• | or, Engine Oil Pressure Sensor and/or Switch Replacement

Did you complete the replacement?

--

Go to Step 10

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11 | Replace the instrument panel cluster (IPC). Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2