C1236

DTC C1236 Schematic:

CIRCUIT DESCRIPTION
This circuit is used to monitor the voltage level available to the EBTCM. If the voltage drops below 10.5 volts, full performance of the ABS/TCS cannot be guaranteed. During ABS/TCS operation, there are several current requirements that will cause battery voltage to drop. Because of this, voltage is monitored prior to ABS/TCS operation to indicate good charging system condition and also during ABS/TCS operation when voltage may drop significantly.

CONDITIONS FOR SETTING THE DTC
DTC C1236 can only be set if the vehicle's speed is greater than 8 km/in (5 mph). If both the battery and ignition voltages are less than 10.5 volts, a malfunction DTC will set.

ACTION TAKEN WHEN THE DTC SETS
A malfunction DTC is stored, ABS/TCS is disabled and the ABS and Traction Control Indicators are turned ON.

CONDITIONS FOR CLEARING THE DTC
- Condition for DTC is no longer present and Scan Tool clear DTC function is used.
- 50 Ignition cycles have passed with no DTC(s) detected.

DIAGNOSTIC AIDS
It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the
malfunction.
^ Check for other low voltage conditions.
^ Test the charging system.
^ Possible causes for DTC C1236 to set:
- Charging System Malfunction.
- Excessive Battery Draw.
- Weak Battery.
- Faulty system ground.

DTC C1236: Low System Supply Voltage:

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
[4] Checks for a good ground.
[6] Checks for battery voltage.