2010 Cadillac CTS Sedan AWD V6-3.6L Page 718

2010 Cadillac CTS Sedan AWD V6-3.6L Page 718

Repair Instructions

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

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

* Transfer Case Fluid Temperature Sensor Replacement (See: Powertrain Management/Transmission Control Systems/Sensors and Switches -

Transmission and Drivetrain/Sensors and Switches - Transfer Case/Temperature Sensor/Switch/Service and Repair)

C0450

DTC C0450

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 C0450 02

- Steering Assist Control Actuator Circuit Shorted to Ground

DTC C0450 0B

- Steering Assist Control Actuator Circuit Current Above Threshold

Diagnostic Fault Information

Circuit/System Description

The electronic brake control module (EBCM) controls the current through the Variable Effort Steering (VES) actuator located on the steering gear.

The current used to control the VES actuator is between 0 and 1 Amp. At low speeds and in parking lot maneuvers the current is applied to the

actuator causing the orifice to open increasing fluid flow and reducing the steering effort. At high speeds the orifice is commanded closed by

reducing current through the actuator and restricting fluid flow increasing steering effort. The EBCM monitors and compares the Commanded and

Feedback Current parameters to detect malfunctions in the VES system.

Conditions for Running the DTC

* The ignition is ON.

* Ignition voltage is greater than 8 volts.

Conditions for Setting the DTC

C0450 0B

The actuator current exceeds 150mA.

C0450 02

If the solenoid feedback voltage is greater than 80 percent while the actuator is commanded ON.

Action Taken When the DTC Sets

* The driver information center (DIC) will display SERVICE POWER STEERING message.

* Vehicle speed will be limited to 80 mph.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.

* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.