P1617

DTC P1617

DTC Descriptor

DTC P1617
- Engine Oil Level Switch Circuit

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview






Circuit/System Description

The engine oil level switch is a normally closed switch that opens when there is a low engine oil level condition. When the switch is open the engine control module (ECM) will detect a high signal voltage input. With the ignition switch turned ON and the engine OFF, the (ECM) should detect a full oil level or a low signal voltage input. The IPC displays the Low Engine Oil Level message in the DIC when a low engine oil level condition is present.

Conditions for Running the DTC

* The vehicle is travelling at a speed greater than 5 km/h (3 mph).
* The throttle position is greater than 5 percent.
* The engine speed is at least 2,000 RPM.
* The vehicle is cruising and is not accelerating.
* The following DTCs are not set:

- P0122
- P0123
- P0506
- P0507

Conditions for Setting the DTC

* The ECM does not detect a transition from a low voltage to a high voltage when the engine speed is at least 2,000 RPM.
* The above condition is present for at least 5 minutes.
* The condition may be present for up to 25 minutes before setting a DTC.

Action Taken When the DTC Sets

* The ECM records the operating conditions at the time the diagnostic test fails. The ECM displays this information in the Failure Records on the scan tool.
* The instrument panel cluster (IPC) displays the low engine oil level message in the DIC.

Conditions for Clearing the DTC

* The DTC becomes history when the conditions for setting the DTC are no longer present.
* The history DTC clears after 40 malfunction-free warm-up cycles.
* The ECM receives a clear code command from the scan tool.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the engine oil level switch.
2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and ground.

• If greater than 1 ohm, test the ground circuit for an open/high resistance.

3. Ignition ON, verify the scan tool Engine Oil Level Switch parameter is Low.

• If not Low, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.

4. Ignition ON, install a 3-A fused jumper wire between the signal circuit and ground. Verify the scan tool Engine Oil Level Switch parameter is Ok.

• If not Ok, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the engine oil level switch.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Engine Oil Level Sensor and/or Switch Replacement for the 6.0L engine
* Engine Oil Level Sensor and/or Switch Replacement for the 7.0L engine
* Refer to Programming and Relearning.Programming and Relearning