2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1405

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.