C1236

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CIRCUIT DESCRIPTION
DTC C1236 monitors the voltage level available to the EBTCM controller. If the voltage drops below 11.4 volts, full performance of the ABS system is not guaranteed. During ABS operation, there are several current requirements that will cause battery voltage at the EBTCM to drop. As a result, voltage is monitored prior to an ABS event to indicate good charging system condition. Voltage is also monitored during an ABS event when voltage may drop significantly.

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

ACTION TAKEN WHEN THE DTC SETS
- A malfunction DTC stores.
- The ABS/ETS disables.
- The amber ABS/ETS warning indicators turn on.
- The red BRAKE warning indicator turns on if the rear piston in the ABS brake motor pack is not in the home position.

CONDITIONS FOR CLEARING THE DTC
- The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.
- 100 drive cycles pass with no DTCs detected.

DIAGNOSTIC AIDS
Many conditions may cause an intermittent malfunction. Proper use of the scan tool enhanced diagnostic function can be used in order to measure the frequency of the fault. Thoroughly inspect any circuitry that may be causing the intermittent complaint for the following conditions:
- Backed out terminals
- Improper mating
- Improperly formed or damaged terminals
- Poor terminal-to-wiring connections
- Rubbed-through wire insulation
- A broken wire inside the insulation

If it is noted that only the ignition voltage drops below acceptable voltage levels after performing a Voltage Load test, inspect CKT 1339 for high resistance or an open condition.