ABS - With Commercial Chassis

CIRCUIT DESCRIPTION
This DTC identifies a malfunction within the EBTCM.

CONDITION FOR SETTING THE DTC
DTC C1256 can be set when there is a solenoid short to battery inside the BPMV (If DTCs C1261-C1274 are set along with C1256 then pursue the solenoid DTCs first). DTC C1256 can be set when there is an internal EBTCM malfunction.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS/TCS is not disabled and the ABS and TRACTION CONTROL indicator lamps are not fumed ON.

CONDITIONS FOR CLEARING THE DTC
Condition for DTC is no longer present and scan tool clear DTC function is used. Fifty start cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
When DTC C1256 is displayed on the scan tool, it will be followed by two more numbers which should be noted along with any other DTCs that may be displayed. The additional two numbers displayed with DTC C1256 are for aiding Engineering to determine the cause of the internal malfunction.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. Checks for EBTCM damage.