C1251

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CIRCUIT DESCRIPTION
This DTC is designed to detect a stripped nut or gear assembly during initialization. During the homing sequence, the piston should reach the top of the bore resulting in a stalled motor. If this does not occur, the motor must be spinning with little or no resistance, indicating a nut/screw or gear malfunction.

CONDITIONS FOR SETTING THE DTC
DTC C1251 can be set during initialization. If the feedback current is less than the command current for a specified period of time, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
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, binds, or slips.

The frequency of the malfunction can be checked by using the ENHANCED DIAGNOSTIC function of the scan tool. If DTC only occurs once and DTC C1264 also occurs, see DTC C1264. If intermittent and ENHANCED DIAGNOSTICS show DTC C1251 occurs during ABS, see DTC C1264.

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