The ABS ECU(Electronic Control Unit) checks the battery voltage and alternator output voltage to determine, as a safety issue, whether the ABS system can operate normally or not.
The normal battery voltage range is essential for controlling the ABS system as intended.
The ABS ECU monitors battery voltage and alternator output voltage by reading the value of voltage.
When the voltage is higher than the expected normal value, this code is set, and the ABS/EBD/ESP functions are prohibited.
If the voltage recovers, to within normal operating range, then the controller returns to normal operation as well.
Item
Detecting Condition
Possible Cause
DTC Strategy
Battery Voltage Monitoring
Poor connection in power supply circuit (IGN+)
Faulty Alternator
Monitoring Period
Continuous (Over voltage faults will be always stored.)
Enable Conditions
When Vign is higher than 16.8V.
- If the voltage is recovered to 16.7V, the controller returns to normal state.
- The monitored supply voltage is filtered and limited to a rise time of 4 volts per second.
Fail-Safe
The ABS/EBD/ESP functions are inhibited.
- The proper function of valves and return pump is not guaranteed.
The ABS/EBD/ESP warning lamps are activated.
The supply voltage to wheel speed sensor is interrupted.