Diagnostic Instructions
DTC Descriptor
DTC P0520: Engine Oil Pressure (EOP) Sensor Circuit
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Oil Pressure Switch Signal
| 1
| P0520
| --
| --
|
Low Reference Oil Pressure Switch Signal
| --
| P0520
| --
| --
|
1. Engine Oil Pressure Indicator Always On
|
Circuit Description
With low oil pressure, the engine oil pressure (EOP) switch closes, and the signal circuit is low. With oil pressure above 4.5 psi, the EOP switch opens, and the signal circuit is high. The powertrain control module (PCM) monitors the oil pressure
switch signal circuit, and sends a class 2 message to the instrument panel cluster (IPC), indicating the switch status.
Conditions for Running the DTC
| • | The ignition is ON, with the engine OFF. |
| • | Engine temperature at the last shutdown was at least 80°C (176°F). |
Conditions for Setting the DTC
| • | The PCM detects that the oil pressure switch signal circuit is high. |
| • | The above condition is present for greater than 10 seconds. |
Action Taken When the DTC Sets
The PCM stores the conditions that are present when the DTC sets. This information is stored as Failure Records data only. This information is not stored as Freeze Frame data.
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 the clear code command from the scan tool. |
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
Scan Tool Reference
Scan Tool Data List
Circuit/System Testing
- Ignition OFF, disconnect the EOP switch.
- Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit and ground.
| ⇒ | If greater than 1.0 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PCM. |
- Ignition ON, install a 3-amp fused jumper wire between the signal circuit and the low reference circuit. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
| ⇒ | If not Low, test the signal circuit of the EOP switch for an open/high resistance. If the circuit tests normal replace the PCM. |
- If all circuits test normal, test or replace the EOP switch.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
