Circuit Description
The Engine Oil Pressure sensor is mounted at the top rear of the engine. The Engine Oil Pressure sensor measures changes in engine oil pressure. The Engine Oil Pressure sensor has a 5 volt reference, a ground and a signal circuit.
The Engine Oil Pressure sensor changes resistance based on changes in engine oil pressure. When the PCM senses a signal voltage lower than the normal operating range of the sensor, this DTC sets.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
The Engine Oil Pressure sensor voltage is greater than 4.5 volts.
Action Taken When the DTC Sets
| • | The PCM stores the DTC information into memory when the diagnostic runs and fails. |
| • | The Malfunction Indicator Lamp (MIL) will not illuminate. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records. |
| • | The Driver Information Center displays a message. |
| • | The Engine Oil Pressure gauge displays 0 psi. |
Conditions for Clearing the DTC
| • | A last test failed, or current DTC, clears when the diagnostic runs and does not fail. |
| • | A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | Use a scan tool in order to clear the DTC. |
Diagnostic Aids:
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 Intermittents and Poor Connections Diagnosis in Wiring Systems. |
| - | Mis-routed harness. |
| - | Rubbed through wire insulation. |
| - | Broken wire inside the insulation. |
| • | An open ground circuit may not set this DTC. Inspect the ground circuit for an open if the EOP gauge displays the maximum pressure. |
| • | The PCM 5.0 volt reference circuits are internally connected within the PCM. If all the Engine Oil Pressure sensor circuits are OK, inspect related 5.0 volt reference circuits. Refer to DTC P1635 5 Volt Reference 1 Circuit . |
| • | Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed. |
| • | For an intermittent, refer to Symptoms . |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step determines if the malfunction is present.
-
Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.
-
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 | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Important:: Before proceeding with the Engine Oil Pressure sensor diagnostic, perform the engine oil pressure test. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical-5.7L.
Did DTC P1635 fail this ignition cycle? | -- | ||
Is the Engine Oil Pressure sensor voltage above the specified value? | 4.5V | |||
Does the scan tool indicate that this diagnostic failed this ignition? | -- | 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 to B+. Is the test lamp illuminated? | -- | |||
7 |
Did you find and correct the condition? | -- | ||
8 | Measure the voltage at the 5 volt reference circuit to ground using the DMM J 39200 . Is the voltage greater than the specified value? | 5V | ||
9 |
Did you find and correct the condition? | -- | ||
10 |
Did you find and correct the condition? | 2ohms | ||
11 |
Important:: Program the replacement PCM. Refer to Powertrain Control Module/Throttle Actuator Control Module Replacement . Replace the PCM. Is the action complete? | -- | -- | |
12 |
Important:: Before replacing the sensor inspect for poor connections.
Is the action complete? | -- | -- | |
13 | Repair the 5.0 volt reference circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
14 |
Does the scan tool indicate that this test ran and passed? | -- | ||
15 | Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed? | -- | Go to the applicable DTC table | System OK |
