C1236

DTC C1236 Low System Voltage:

Low System Voltage Schematic:

CIRCUIT DESCRIPTION
This circuit is used to monitor the voltage level available to the EBCM/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.

CONDITION FOR SETTING THE DTC
- DTC C1236 can only be set if the vehicle's speed is greater than 8 km/h (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 OFF" Indicator lamps are turned "ON."

CONDITIONS FOR CLEARING 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.
Possible causes:
- Charging System Malfunction
- Excessive Battery Draw
- Weak Battery

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
3. Checks for a good ground.
5. Checks for battery voltage.