1. Alternator
2. HECU
The ABS ECU(Electronic Control Unit) checks the battery voltage and generator 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 HECU monitors the battery voltage by reading the value of voltage.
When the voltage is lower than the expected normal value, this code is set.
The ABS/ESP functions are prohibited and the EBD function is allowed on LOW VOLTAGE CONDITION, the ABS/EBD/ESP function are prohibited on UNDER VOLTAGE CONDITION.
If the voltage recovers, to within normal operating ranges, then the controller returns to normal operations as well.
Item
Detecting Condition
Possible cause
DTC Strategy
Battery Voltage Monitoring
Poor connection in power supply circuit (ABS)
Faulty HECU
Monitoring Period
Continuous
Case 1
(Low voltage)
Enable
Conditions
When Vign is lower than 9.4±0.5V for more than 500ms in speed of over 6Kph. (3.7mph)
- If IGN voltage is recovered to 9.8±0.5V, the system recovers to normal state
Fail Safe
The ABS/ESP functions are inhibited
The ABS/ESP warning lamps are activated
Case 2
(Under voltage)
When Vign is lower than 7.6±0.5V for more than 500ms in speed of over 6Kph. (3.7mph)
- If IGN voltage is recovered to 7.8±0.5V, the system recovers to normal state
The ABS/EBD/ESP functions are inhibited
The ABS/EBD/ESP warning lamps are activated