DTC P0520
Diagnostic Instructions
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
|
Signal
|
1
|
P0520 00
|
1
|
-
|
Ground
|
-
|
P0520 00
|
-
|
-
|
1. Engine Oil Pressure Indicator Malfunction
|
|
| |
Typical Scan Tool Data
ECM - Engine Oil Pressure Switch
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: Engine Running
Parameter Normal Range: OK
|
Signal
|
Low
|
OK
|
OK
|
Ground
|
-
|
OK
|
-
|
|
| |
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
| • |
The ECM detects that the
engine oil pressure switch signal circuit is pulled low.
|
| • |
The above condition is present
for greater than 10 s. |
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 conditions for setting the DTC
are no longer present.
Reference Information
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
Ignition ON, observe the scan tool ECM - Engine Oil Pressure
Switch parameter with the ignition switch turned ON and the engine
not running the reading should be Low, with the engine running the
reading should be OK.
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the B37 Engine Oil Pressure Switch.
|
| 2. |
Ignition ON, verify the scan
tool Engine Oil Pressure Switch parameter is OK. |
| ⇒ |
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. |
| 3. |
Install a 3 A fused jumper
wire between the signal circuit terminal 1 and ground. Verify the
scan tool Engine Oil Pressure Switch parameter is Low. |
| ⇒ |
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. |
| 4. |
If all circuits test normal,
test or replace the B37 Engine Oil Pressure Switch. |
Component Testing
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 1 and ground with the switch in the
open position. |
| ⇒ |
If not the specified value, replace the B37 Engine
Oil Pressure Switch. |
| 3. |
Test for less than 5 Ω
between the signal terminal 1 and ground with the switch in the
closed position. |
| ⇒ |
If greater than the specified range, replace the
B37 Engine Oil Pressure Switch. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
