2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1405
瀚慖f not the specified value, replace the B37 Engine Oil Pressure Switch.
3. Test for less than 5 ohm between the signal terminal A and the low reference terminal B with the switch in the closed position.
瀚慖f greater than the specified range, replace the B37 Engine Oil Pressure Switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Engine Oil Pressure Sensor and/or Switch Replacement (LF1) (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure
Sensor/Service and Repair)Engine Oil Pressure Sensor and/or Switch Replacement (LAU) (See: Engine, Cooling and
Exhaust/Engine/Engine Lubrication/Oil Pressure Sensor/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup, and programming
P0521
DTC P0521, P0522, or P0523
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
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/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.
