A041

DTC A041 Right Front ESB Will Not Hold Motor:

Circuit Description:
This DTC is designed to detect a slipping left front ESB. During initialization and braking, the left front motor is rehomed. If the ESB slips, the motor/piston will move. Turning the next ignition "ON" initialization, a rehome of the motor verifies that the motor/piston remained at the home position. if motor movement is detected, the ESB must be slipping.

Failure Condition:
DTC AO41 can be set during initialization. If the EBCM detects that the ESB could not hold the piston in the home position, a malfunction exists.

Action Taken:
If an ESB cannot hold a piston in the home position, the piston may be backdriven when the brake pedal is applied, causing the brake pedal to stop. DTCs AO41 and AO86 are stored, ABS is disabled and the "ABS" indicator is turned on.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This step checks the right front ESB. A broken or defective ESB would result in the right front piston being backdriven by hydraulic pressure and pedal movement would result.
2. This test checks for high resistance in the right front motor high circuit.
3. This test checks for high resistance in the right front motor low circuit.
4. This test checks for high resistance in the right front motor.
5. This test determines if the fault is due to poor terminal contact or corrosion.
6. This test determines if the fault is due to a faulty EBCM.

Diagnostic Aids:
An "intermittent" malfunction in this DTC may result from a mechanical part of the system that sticks, binds or sticks.

The frequency of the malfunction can be checked by using the enhanced diagnostic feature of the TECH 1.

The static modular function of the TECH 1 may be used to locate an intermittent malfunction associated with the ESB.