PRE-RELEASE
DTC P0520
| DTC P0520 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC P0520 00
Engine Oil Pressure Switch Circuit Malfunction
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Signal
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1
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P0520 00
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1
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-
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Ground
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-
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P0520 00
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-
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-
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1. Engine Oil Pressure Indicator Malfunction
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| Typical Scan Tool Data |
ECM - Engine Oil Pressure Switch
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running
Parameter Normal Range: OK |
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Signal
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Low
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OK
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OK
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Ground
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-
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OK
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-
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| Circuit/System Description |
The engine oil pressure switch is a normally closed switch that opens with the proper oil pressure. With the ignition switch turned ON and the engine not running, the engine control module (ECM) should detect a low signal voltage input. With the engine running, the engine oil pressure switch opens and the ECM should detect a high signal voltage input. When the oil pressure is low, the ECM sends a message via High Speed CAN-Bus to the body control module (BCM). The BCM then sends a message via Low Speed CAN-Bus to the instrument cluster requesting the engine oil pressure indicator turned ON.
| Conditions for Running the DTC |
The engine is running.
| Conditions for Setting the DTC |
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The ECM detects that the engine oil pressure switch signal circuit is pulled low.
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The above condition is present for greater than 10 seconds.
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| Action Taken When the DTC Sets |
The instrument cluster illuminates the service vehicle soon indicator and the oil pressure low indicator.
| Conditions for Clearing the DTC |
The DTC becomes history when the condition for setting the DTC is no longer present.
| Reference Information |
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
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Instrument Cluster Description and Operation
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Indicator/Warning Message Description and Operation
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Driver Information Center (DIC) Description and Operation
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Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
With ignition ON, check the diagnostic tool's parameter for Oil pressure switch. With ignition ON and engine off, the parameter should be Low, and with the engine on it should be OK.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch.
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| 2. |
Ignition ON, verify the scan tool Engine Oil Pressure Switch parameter is OK.
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| 3. |
If not the specified value, test for the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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Terminal 1 except LDK
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Terminal A with LDK
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| 4. |
Install a 3 A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Engine Oil Pressure Switch parameter is Low.
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Terminal 1 except LDK
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Terminal A with LDK
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| 5. |
If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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| 6. |
If all circuits test normal, test or replace the B37 Engine Oil Pressure Switch.
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| Component Testing |
Static Test
| 1. |
Ignition OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch.
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| 2. |
Test for infinite resistance between the signal terminal listed below and ground with the switch in the open position.
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Terminal 1 except LDK
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Terminal A with LDK
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| 3. |
If not the specified value, replace the B37 Engine Oil Pressure Switch.
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| 4. |
Test for less than 5 Ω between the signal terminal listed below and ground with the switch in the closed position.
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Terminal 1 except LDK
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Terminal A with LDK
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| 5. |
If greater than the specified range, replace the B37 Engine Oil Pressure Switch.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Engine Oil Pressure Switch Replacement
for LBS or LBY
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Engine Oil Pressure Switch Replacement
for LDK
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Engine Oil Pressure Sensor Replacement
for LBW or LAU
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Control Module References
for instrument cluster or ECM replacement, setup and programming
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