C1246

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CIRCUIT DESCRIPTION
This DTC is designed to detect bound-up ESB's, stuck motor or a seized hydraulic modulator. Release is commanded during initialization, the ESB should release the motor, resulting in sensed current being less than commanded current (motor is spinning freely). If the motor is not moving, sensed current will be equal to stall current.

CONDITIONS FOR SETTING THE DTC
DTC C1246 can be set during initialization. The EBCM commands the rear motor in the reverse and forward direction to ensure the motor moves properly. If the EBCM detects a condition in which it cannot move the motor in either direction, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
This malfunction indicates the channel cannot be moved properly. A malfunction DTC is stored, ABS is disabled, and the ABS indicator lamp is turned ON.

CONDITIONS FOR CLEARING THE DTC
Conditions for the malfunction are no longer present and the scan tool CLEAR DTCs function is used. One hundred ignition switch key cycles have passed with no malfunctions detected.

DIAGNOSTIC AIDS
An intermittent malfunction in this DTC may result from a mechanical part of the system that sticks or binds.

The frequency of the malfunction can be checked by using the ENHANCED DIAGNOSTIC function of the scan tool.

NOTE: DTC C1246 may set after modulator disassembly if the modulator pistons are positioned at the bottom of their bore.

Depending on the frequency of the malfunction, a physical inspection of the suspected mechanical parts may be necessary.

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.