ABS - With Traction Control

CIRCUIT DESCRIPTION
This DTC is used to monitor the voltage level available to the EBCM/EBTCM controller. If the voltage drops below 11.4 volts, full performance of the ABS system cannot be guaranteed. During ABS operation, there are several current requirements that will cause battery voltage at the EBCM/EBTCM to drop. Because of this, voltage is monitored prior to an ABS event to indicate good charging system condition and also during an ABS event when voltage may drop significantly.

CONDITIONS FOR SETTING THE DTC
DTC C1236 can only be set if the vehicle's speed is greater than 5 km/h (3 mph). If the switched battery voltage is less than 11.4 volts non-ABS event or less than 8.4 volts during a ABS event, a malfunction exists.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS/ETS is disabled, and the amber ABS warning indicator is fumed on. The red BRAKE warning indicator is fumed on if the rear piston in the ABS brake motor pack is not in the home position.

CONDITIONS FOR CLEARING DTC
Condition for DTC is no longer present and the scan tool (CLEAR DTCs) function is used, or 100 drive cycles have passed with no DTC(s) detected.

DIAGNOSTIC AIDS
An intermittent malfunction may be caused by a poor connection, rubbed-through wire insulation, or a wire that is broken inside the insulation. The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Scan Tool. 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 hamess. While performing a voltage load test, if it is noted that only the ignition voltage drops below acceptable voltage levels, CKT 1339 should be checked for high resistance or an open condition.

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