2010 Cadillac Truck SRX FWD V6-3.0L Page 1542

2010 Cadillac Truck SRX FWD V6-3.0L Page 1542

Control Module.

4. Install a 3 A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Engine Oil Pressure Switch parameter

is Low.

瀚慖f 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.

5. 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 A and the low reference terminal B with the switch in the open position.

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