The engine oil pressure (EOP) sensor is mounted at the top rear of the engine. The EOP sensor measures changes in engine oil pressure. The EOP sensor has a 5 volt reference, a ground and a signal circuit.
The EOP sensor changes resistance based on changes in engine oil pressure. The PCM sends the engine oil pressure sensor information to the instrument panel cluster (IPC) via the class 2 circuit. When the EOP is out of range the driver information center (DIC) displays a message.
Important:
• Remove any debris from the PCM\TAC module connector surfaces before
servicing the PCM\TAC module. Inspect the PCM\TAC module connector gaskets
when diagnosing/replacing the modules. Ensure that the gaskets are
installed correctly. The gaskets prevent contaminate intrusion into
the PCM\TAC modules. • For any test that requires probing the PCM or a component
harness connector, use the Connector Test Adapter Kit J 35616
. Using this kit prevents damage
to the harness/component terminals. Refer to
Using Connector Test Adapters
in Wiring Systems.
• | The following may cause an intermittent: |
- | Poor connections |
- | Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
- | Mis-routed harness |
- | Rubbed through wire insulation |
- | Broken wire inside the insulation |
• | Inspect the ground circuit for an open if the EOP gauge displays the maximum pressure. |
• | For an intermittent, refer to Symptoms . |
The numbers below refer to the step numbers on the diagnostic table.
This step determines if the malfunction is present.
This step tests if the ground circuit is open.
This step tests if the signal circuit is shorted to a voltage.
This step verifies if a ground circuit is available at the Engine Oil Pressure sensor.
Step | Action | Values | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Symptoms | |||||
2 |
Important:
Is the Engine Oil Pressure sensor voltage above the specified value? | 4.0V | Go to Diagnostic Aids | |||||
Is the Engine Oil Pressure sensor voltage below the specified value? | 1V | |||||||
Probe the sensor ground circuit with the test lamp J 35616-200 connected to B+. Is the test lamp illuminated? | -- | |||||||
Measure the voltage at the 5 volt reference circuit to ground using the DMM . Is the voltage greater than the specified value? | 5V | |||||||
Did you find and correct the condition? | -- | System OK | ||||||
7 |
Did you find and correct the condition? | -- | System OK | |||||
8 |
Did you find and correct the condition? | 2ohms | System OK | |||||
9 | Repair the 5.0 volt reference circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | System OK | -- | ||||
10 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement . Is the action complete? | -- | System OK | -- | ||||
11 |
Important: Before replacing the sensor inspect for poor connections. Is the action complete? | -- | System OK | -- |