C1246

DTC C1246 (1 Of 3):

DTC C1246 (2 Of 3):

DTC C1246 (3 Of 3):

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

CONDITIONS FOR SETTING THE DTC
DTC C1246 can be set during brake motor initialization at 0 km/h (0 mph) with the brake off or DTC C1246 can be set during brake motor initialization at 5 km/h (3 mph) with the brake on. DTC C1246 can also be set during ABS stops. If the EBCM detects a condition in which it cannot move the ABS 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, the amber ABS warning indicator and the red BRAKE warning indicator are turned on.

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. 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 mechanical parts suspected 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.

NOTE: J 39200 test leads must be zeroed prior to making any resistance measurements.

After diagnosis is complete, clear the DTCs and test drive the vehicle for three drive cycles to verify that the DTC does not reset. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition off.