DTC A052: Left Front Channel In Release Too Long

LEFT FRONT CHANNEL IN RELEASE TOO LONG





Circuit Description
This DTC will diagnose a motor that is energized longer than expected. This could occur if a wheel speed sensor is malfunctioning, the motor does not turn, the left front solenoid mechanically fails open, or the motor wires are crossed.

Diagnosis
The system monitors the total time in which release is commanded. If the left front channel is in release for more than 3 seconds, the system will store a failure code.

Cause(s)
- The left front wheel speed sensor or the wiring shorted together during ABS operation.
- The solenoid had a mechanical failure.
- The motor pack assembly is faulty.

Fail Action
This is a critical operational fault. The ABS is disabled and the ABS warning lamp is turned on. A rehome is commanded to ensure that the motors are in the home position.

Test Description
The number(s) below refer to step(s) on the diagnostic table.
2. This step identifies a problem in a wheel speed sensor that may cause the system to be in release too long.
3. This step identifies a motor as being failed or wired incorrectly.
4. This step checks for a solenoid that may have mechanically failed open.
6. If Step 4 has failed, this serves to trace the cause of the hydraulic problem to either the solenoid or the hydraulic modulator.
11. This step determines whether a malfunctioning motor pack or hydraulic modulator is the reason for DTC A052 being set.

Diagnostic Aids
An intermittent malfunction in this DTC may result from a mechanical part of the system that sticks or binds.
Check the frequency of the malfunction by using the enhanced diagnostic feature of the scan tool as described in "Scan Tool Diagnostics." Scan Tool Diagnostics
DTC A052 may fail if the vehicle is on ice and the steering wheel is turned to lock during braking. Use the scan tool to perform the hydraulic test to ensure that the total brake system is functional.
Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wiring connections, or physical damage to the wiring harness.








DTC A052 - Left Front Channel in Release Too Long