C1241

DTC C1241





Test 1-3





Test 4-12

Circuit Description
The Variable Effort Steering (VES) system uses the Electronic Brake Control Module (EBCM) to command current from zero amps to positive three amps to an electromagnetic rotary actuator. The VES system uses the Antilock Brake System (ABS) wheel speed sensor inputs to determine vehicle speed. At low speeds, no current is commanded and steering is assisted by hydraulics only. At high speeds, A positive current is commanded to the VES actuator to create steering resistance. The EBCM monitors and compares commanded and feedback currents to detect malfunctions in the VES actuator or the circuits to the actuator.

Conditions for Running the DTC
^ Ignition voltage between 10.5 - 17 volts
^ Off state test-initial ignition ON, no engine rpm, or vehicle speed present
^ On state test-if off state test passes, engine rpm and vehicle speed present.

Condition 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
^ A DTC C1241 is stored in memory.
^ The DTC may display the SERVICE STEERING SYS warning message.
^ The VES system is disabled.

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 ignition cycles with no malfunction present.
^ Using the scan tool

Diagnostic Aids
The vehicle needs to be driven to view the full commanded and feedback current ranges.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests if the commanded and feedback current parameters are in specified range in there active state.
3. Tests if the VES actuator resistance is within specified range.
11. Perform the setup procedure after EBCM replacement.