• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Engine Oil Level Sensor Signal | 2 | 1 | -- | 1 |
Engine Oil Level Sensor Low Reference | -- | 1 | -- | -- |
1. DIC message Engine Oil Level Low Always On 2. DIC message Engine Oil Level Low Never On |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: OK | |||
Engine Oil Level Sensor/Switch Signal | OK | Low | OK |
Engine Oil Level Ground | -- | Low | -- |
The engine oil level sensor/switch is a normally-closed with proper engine oil level. The switch opens when the engine oil level drops below a calibrated level. The engine control module (ECM) monitors the engine oil level signal circuit when the ignition is ON, and the engine is OFF. With the switch in the closed position, the ECM detects a low voltage signal circuit. With the switch in the open position, the ECM detects a high voltage on the signal circuit. When high voltage is detected on the signal circuit, the ECM will send a serial data message to the instrument panel cluster (IPC) and a message is displayed on the driver information center (DIC).
The oil level low message is displayed only after the ECM detects a high voltage on the signal circuit, followed by an ignition OFF event greater than 30 minutes, followed again by the detection of high voltage on the signal circuit when the ignition is turned to the ON position.
The oil level low message is turned OFF when the ECM detects a low voltage on the signal circuit and after an ignition OFF event for greater than 90 seconds, followed by the detection of low voltage on the signal circuit when the ignition has been turned to the ON position for less than 1 second.
Control Module References for scan tool information.
Note: Verify proper engine oil level before continuing with diagnosis.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the IPC. |
⇒ | If the Oil Level parameter reads OK, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM. |
Important: If a short to voltage is found on the signal circuit, the fuse in the 3A jumper wire will open.
⇒ | If the Engine Oil Level parameter reads Low, test the signal circuit terminal A for an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for the IPC or ECM replacement, setup, and programming |
• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Engine Oil Level Sensor Signal | -- | 1 | -- | 1 |
Engine Oil Level Sensor Low Reference | -- | 1 | -- | -- |
1. Low Engine Oil Level Indicator Always On |
The engine oil level sensor is a normally-closed switch that opens when engine oil level drops below a calibrated level. In the closed position, the low reference circuit of the oil level sensor produces a low voltage on the oil level sensor signal at the ECM. With a low engine oil level, the switch opens producing a high voltage on the oil level sensor signal at the ECM. When the ECM detects high voltage on the oil level sensor signal, the ECM will illuminate the Low Engine Oil indicator or cause a Check Engine Oil message to be displayed on the driver information center (DIC).
Control Module References for scan tool information.
Note: Verify proper engine oil level before continuing with diagnosis.
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If the Oil Level parameter reads OK, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the IPC. |
⇒ | If the Engine Oil Level parameter reads Low, test the signal circuit terminal A for an open/high resistance. If the circuit tests normal, replace the ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for the IPC replacement, setup, and programming |