C1241

DTC C1241





test 1-4





Test 5-12

Circuit Description
The Variable Effort Steering (VES) system uses the Electronic Brake Control Module (EBCM) to control current to a bidirectional electromagnetic rotary actuator. The EBCM commands current from negative two amps to positive three amps to the 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.

Conditions for running the DTC
^ Ignition voltage between 10.5 and 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.

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
^ 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 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 full commanded and feedback current ranges on the scan tool.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Tests if the Commanded and Feedback current parameters are at the specified value in there active state.
3. Tests if the resistance of the VES actuator is in the specified range.
5. Tests the High Effort Control circuit for an open or short to voltage.
6. Tests the Low Effort Control circuit for a short to ground.
8. Tests for poor connections at the VES actuator harness connector.
11. Perform the setup procedure after EBCM replacement.