C0450

DTC C0450

Circuit Description
The variable effort steering (VES) system uses the electronic brake control module (EBCM) to control current to a bi-directional electromagnetic rotary actuator. The VES system also uses the ABS wheel speed sensor inputs to determine vehicle speed. The EBCM commands current from negative 2 amps to positive 3 amps to the VES actuator. At low speeds, a negative current is commanded, which assists steering. At medium speeds, no current is commanded and steering is assisted by hydraulics only. At high speeds, a positive current is commanded, which creates steering resistance.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0450 Steering Assist Control Solenoid/Motor/Actuator Circuit

Conditions for Running the DTC
^ Ignition voltage between 10.5-17 volts
^ Ignition ON, and engine ON

Conditions for Setting the DTC
An open, short to ground, or short to voltage in the VES actuator or the circuits to the actuator

Action Taken When the DTC Sets
^ DTC C0450 is stored in memory.
^ The VES output is disabled for the remainder of the ignition cycle.

Conditions for Clearing the DTC
^ A current DTC will clear when the malfunction is no longer present.
^ A history DTC will clear after 100 consecutive malfunction-free ignition cycles.

Diagnostic Aids
A short to voltage on the high or low effort circuits to the VES actuator can also cause DTC's C0236, C0244, U1000, U1016, or U1064 to set.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests if the VES malfunction is current or intermittent.
3. This step tests if the VES actuator resistance is in the specified range.








13. Perform the programming procedure after EBCM replacement.