C0450

DTC C0450

Circuit Description
The EBCM controls a bidirectional magnetic rotary solenoid. The solenoid is in the steering gear. The solenoid adjusts the amount of power steering assist in order to achieve a given level of driver effort in turning the vehicle. The EBCM varies the steering assist by adjusting the current flow through the solenoid. The amount of steering assist adjusted for steering is dependent upon vehicle speed. As the vehicle speed increases, the following actions occur:
- The steering assist decreases
- The driver effort increases.

Conditions for Running the DTC
The EBCM performs 2 diagnostic tests for the VES circuits when the ignition voltage is between 10.5 volts and 17 volts. The numbers below correspond to the numbers in Conditions for Setting the DTC.
1. Off State Test (Open Circuit Test) - When the ignition is first turned ON, the EBCM performs an open circuit test independent of vehicle speed or engine running.
2. On State Test (Open or Short Circuit Test) - If the Off State Test is passed, the EBCM runs the On State Test during VES operations. The VES operations occur during driving. The EBCM detects an open or short in the VES circuit by comparing the feedback current to the commanded current.

Conditions for Setting the DTC
The EBCM performs 2 different tests to detect a DTC condition.
The numbers below correspond to the numbers in Conditions for Running the DTC.
1. The EBCM detects an open in the VES circuit.
2. The EBCM detects an open or short in the VES circuit when the feedback current is less than 155 mA while the absolute value of the commanded current is greater than 826 mA for 2.5 seconds.

Action Taken When the DTC Sets
The EBCM disables the Variable Effort Steering (VES) for the duration of the ignition cycle.

Conditions for Clearing the DTC
- The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.
- The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
The vehicle may need to be driven to view non-zero values of the Magna Steer Commanded Current and Magna Steer Feedback Current on the scan tool.








Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step uses the scan tool to check the Magna Steer Feedback Current parameter.
6. This step checks for an open in the variable effort steering actuator and circuit.