2010 Cadillac CTS Sedan AWD V6-3.0L Page 1473

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1473

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)for 3.6L engine

* Engine Oil Pressure Sensor and/or Switch Replacement (See: Engine, Cooling and Exhaust/Engine/Engine Lubrication/Oil Pressure

Sensor/Service and Repair)for 4.8L, 5.3L, 6.0L, 6.2L or 7.0L engine

* Control Module References (See: Testing and Inspection/Programming and Relearning)for ECM replacement, setup and programming

P0522

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 (EOP) Sensor Performance

DTC P0522

- Engine Oil Pressure (EOP) Sensor Circuit Low Voltage.

DTC P0523

- Engine Oil Pressure (EOP) Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The engine oil pressure (EOP) sensor changes voltage based on the engine oil pressure. The EOP sensor is a 3-wire sensor comprising of the signal

circuit, the low reference circuit and the 5-volt reference circuit. The engine control module (ECM) supplies 5 volts to the EOP sensor via the 5-volt

reference circuit and provides ground via the EOP low reference circuit. The ECM monitors the signal circuit of the EOP sensor to determine the

engine oil pressure sensor voltage is within the normal operating range of approximately 1-4 volts. When the engine oil pressure is high, the EOP

sensor voltage is high and the ECM senses a high signal voltage. When the engine oil pressure is low, the EOP sensor voltage is low and the ECM

senses a low signal voltage. The ECM sends the EOP information to the instrument panel cluster (IPC) via the serial data circuit.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

P0521

* The engine oil pressure is greater than 880 kPa (127.6 psi).

* The engine oil pressure is less than 8 kPa (1.16 psi).

* The ECM does not detect a change in the engine oil pressure of at least 34.5 kPa (5.0 psi).

* The above condition is present over a predetermined variance of engine speed.

P0522

* The ECM detects that the EOP sensor signal circuit is less than 0.2 volt.

* The above condition is present for greater than 10 seconds.

P0523

* The ECM detects that the EOP sensor signal circuit is greater than 4.8 volts.