DTC P0523 L47
Circuit Description
The engine oil pressure (EOP) switch changes resistance based on engine oil pressure. The PCM monitors the signal circuit of the EOP switch. When the oil pressure is high, the sensor resistance is high and the PCM senses a high signal voltage. When the oil pressure is low, the sensor resistance is low and the PCM senses a low signal voltage. The PCM sends the engine oil pressure information to the IPC via the class 2 serial data circuit.
Conditions for Running the DTC
| • | The ignition is ON, with the engine OFF. |
| • | P1635 is not set. |
Conditions for Setting the DTC
| • | The PCM detects that the EOP switch signal circuit is greater than 4.9 volts. |
| • | The above condition is present for greater than 9 seconds. |
Action Taken When the DTC Sets
The PCM records the operating conditions at the time the diagnostic fails. The PCM displays this information in the Failure Records on the scan tool.
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 PCM receives a clear code command from the scan tool. |
Diagnostic Aids
Using the Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the 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.
Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Instrument Cluster Schematics | |||
1 | Did you perform the Instrument Cluster Diagnostic System Check? | Go to Step 2 | |
2 |
Does the Engine Oil Pressure Switch parameter indicate LOW? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the Engine Oil Pressure Switch parameter indicate Low? | Go to Step 5 | Go to Step 4 |
4 | Test the engine oil pressure signal circuit for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 7 |
5 | Test the low reference circuit of the engine oil pressure sensor for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the harness connector of the engine oil pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the engine oil pressure sensor. Refer to Engine Oil Pressure Sensor and/or Switch Replacement . in Engine Mechanical - 4.0L. Did you complete the replacement? | Go to Step 10 | -- |
9 |
Important: Program the replacement PCM. Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.0L. Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |
