Engine Oil Pressure Indicator Malfunction
|
|
Engine Oil Pressure Indicator Malfunction
|
|
Diagnostic Fault Information
|
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
Signal
|
1
|
P0520
|
1
|
-
|
Ground
|
-
|
P0520
|
-
|
-
|
1. Engine Oil Pressure Indicator Malfunction
|
|
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.
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Indicator/Warning Message Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References
for scan tool information
|
Circuit/System Verification
|
With LLU
With ignition ON, check the diagnostic tool's parameter for ECM - Oil pressure switch. With ignition ON and engine off, the parameter should be Low, and with the engine on it should be OK.
Except LLU
|
1.
|
Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify that the engine oil pressure indicator changes between turn ON and OFF.
|
|
2.
|
If the engine oil pressure indicator always stays on or always off, replace the P16 Instrument Cluster.
|
|
3.
|
If the engine oil pressure indicator changes between ON and OFF, replace the K20 Engine Control Module.
|
With LLU
|
1.
|
Ignition OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch.
|
|
2.
|
Ignition ON, verify the scan tool ECM - Engine Oil Pressure Switch parameter is OK.
|
|
3.
|
If not the specified value, test for the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
4.
|
Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool ECM - Engine Oil Pressure Switch is Low.
|
|
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.
|
|
6.
|
Command the All Indicators test ON and OFF with the scan tool. The engine oil pressure indicator should turn ON and OFF when changing between the commanded states.
|
|
7.
|
If the engine oil pressure indicator always stays on or always off, replace the P16 Instrument Cluster.
|
|
8.
|
If all circuits test normal, test or replace the B37 Engine Oil Pressure Switch.
|
Static Test
|
1.
|
Ignition OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch.
|
|
2.
|
Test for infinite resistance between the signal terminal listed below and ground with the switch in the open position.
|
|
3.
|
If not the specified value, replace the B37 Engine Oil Pressure Switch.
|
|
4.
|
Test for less than 5 Ω between the signal terminal listed below and ground with the switch in the closed position.
|
|
5.
|
If greater than the specified range, replace the B37 Engine Oil Pressure Switch.
|
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
