DTC P0521, P0522, or P0523
Diagnostic Instructions
DTC Descriptors
| DTC P0521: Engine Oil Pressure Sensor
Performance |
| DTC P0522: Engine Oil Pressure Sensor Circuit
Low Voltage |
| DTC P0523: Engine Oil Pressure Sensor Circuit
High Voltage |
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5V Reference
|
P0522
|
P0523
|
P0523
|
P0521
|
Signal
|
P0522
|
P0523
|
P0523
|
P0521
|
Low Reference
|
-
|
P0523
|
-
|
P0521
|
|
| |
Circuit/System Description
The engine oil pressure sensor changes voltage based on the
engine oil pressure. The engine oil pressure sensor is a 3-wire
sensor comprised of the signal circuit, the low reference circuit
and the 5 V reference circuit. The engine control module (ECM)
supplies 5 V to the engine oil pressure sensor via the 5 V
reference circuit and provides ground via the engine oil pressure
sensor low reference circuit. The ECM monitors the signal circuit
of the engine oil pressure sensor to determine the engine oil
pressure sensor voltage is within the normal operating range of
approximately 1-4 V. When the engine oil pressure is high, the
engine oil pressure sensor voltage is high and the sensor senses a
high signal voltage. When the engine oil pressure is low, the
engine oil pressure sensor voltage is low and the ECM senses a low
signal voltage. The ECM sends the engine oil pressure sensor
information via High Speed CAN-Bus to the body control module
(BCM). The BCM then sends the engine oil pressure sensor
information via Low Speed CAN-Bus to the instrument cluster.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
P0521
| • |
The engine oil pressure is out
of its working range. |
| • |
The ECM does not detect a
change in the engine oil pressure. |
| • |
The above condition is present
over a predetermined variance of engine speed. |
P0522
| • |
The ECM detects a short to
ground in the engine oil pressure signal circuit. |
| • |
The above condition is present
for greater than 10 s. |
P0523
| • |
The ECM detects a short to
voltage or an open circuit in the engine oil pressure signal
circuit. |
| • |
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.
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
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Ignition On, observe the DTC
information with a scan tool. Verify that DTCs P0651 is not
set. |
| ⇒ |
If any DTCs are set, refer to: |
| 2. |
Engine running, observe the
ECM scan tool Engine Oil Pressure Sensor parameter. The reading
should be between 0.3-4.8 V. |
| ⇒ |
If not the specified value, refer to
Circuit/System Testing. |
Circuit/System Testing
| 1. |
Ignition OFF, disconnect the
harness connector at the B37B Engine Oil Pressure Sensor.
|
| 2. |
Ignition OFF, test for less
than 10 Ω between the low reference circuit terminal 3 and
ground. |
| ⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 3. |
Ignition ON, test for 4.8-5.2
V between the 5 V reference circuit terminal 1 and ground.
|
| ⇒ |
If less than the specified range, test the 5 V
reference circuit for a short to ground or an open/high resistance.
If the circuit tests normal, replace the K20 Engine Control
Module. |
| ⇒ |
If greater than the specified range, test the 5 V
reference circuit for a short to voltage. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 4. |
Verify the scan tool Engine
Oil Pressure Sensor parameter is greater than 4.8 V. |
| ⇒ |
If less than the specified range, test the signal
circuit terminal 2 for a short to ground. If the circuit tests
normal, replace the K20 Engine Control Module. |
| 5. |
Install a 3 A fused jumper
wire between the signal circuit terminal 2 and the low reference
circuit terminal 3. Verify the scan tool Engine Oil Pressure Sensor
parameter is less than 0.3 V. |
| ⇒ |
If greater than the specified range, 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. |
If all circuits test normal,
replace the B37B Engine Oil Pressure Sensor. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
