C0450

DTC C0450 (NV7)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0450 01
- Steering Assist Control Actuator Circuit Short to Battery

DTC C0450 02
- Steering Assist Control Actuator Circuit Short to Ground

DTC C0450 04
- Steering Assist Control Actuator Circuit Open

Diagnostic Fault Information






Circuit/System Description

The actuator is a variable electromagnetic actuator, which consists of one multiple-pole ring-style permanent magnet, with a pole piece, and an electromagnetic coil assembly. By commanding currents between -3 to +3 A through the coils the steering effort will be adapted accordingly.

Conditions for Running the DTC

* System voltage between 9-16 V

* Engine running

Conditions for Setting the DTC

The variable effort steering detects a short to battery, short to ground or an open circuit in the actuator circuits.

C0450 01

If the coil feedback voltage is measured greater than 8 V during the initialization of the module, the DTC will be set.

C0450 02

If the coil feedback voltage is measured less than 3.4 V during the initialization of the module, the DTC will be set.

C0450 04

If the coil current is measured to be less/greater than 1.0 A from the commanded current, the DTC will be set.

Action Taken When the DTC Sets

* DTC C0450 is stored in memory.

* The fault lamp illuminates or the driver information center displays the service power steering message.

* The variable effort steering module goes in to shutdown mode.

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 variable effort steering automatically clears the history DTC when a current DTC is not detected in 40 consecutive communication wake-up enable cycles.

Reference Information

Schematic Reference

Power Steering Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left

Description and Operation

Power Steering System Description and Operation (Hydraulic Power Steering (NJ0)) Power Steering System Description and Operation (Hydraulic Power Steering (NJ0))Power Steering System Description and Operation (Electronic Power Steering) Power Steering System (Electronic Power Steering)

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X115 harness connector at the M72 variable power steering solenoid valve.

2. Test for less than 10 ohms between the low reference circuit terminal B and ground.

• If greater than the specified range

1. Disconnect the harness connector at the K43 Power Steering Control Module.

2. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K43 Power Steering Control Module.

• If within the specified range

3. Test for less than 1 V between the signal circuit terminal A and ground.

• If greater than the specified range
Repair the short to voltage on the circuit.

• If within the specified range

4. Ignition ON, test for B+ between the signal circuit terminal A and ground.

• If less than B+

1. Disconnect the harness connector at the K43 Power Steering Control Module.

2. Test for infinite resistance between the signal circuit terminal A and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance

3. Test for less than 2 ohms in the low reference circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K43 Power Steering Control Module.

• If B+

5. Test for 1.6-3.1 ohms between control terminal A and control terminal B of the harness connector at the M72 variable power steering solenoid valve.

• If not within the specified range
Replace the M72 variable power steering solenoid valve.

• If within the specified range

6. Test for infinite resistance between each terminal and the M72 variable power steering solenoid valve housing case.

• If less than infinite resistance
Replace the M72 variable power steering solenoid valve.

• If infinite resistance

7. Replace the K43 Power Steering Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Steering Power Variable Control Module Replacement Service and Repair for power steering control module replacement

* Control Module References Control Module References for power steering control module replacement, setup and programming