The ABS ECU(Electronic Control Unit) checks the battery 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 instended.
The ABS ECU monitors battery voltage by reading the value of voltage. When the voltage is higher than the expected normal value, this code is set, and both ABS and EBD functions are prohibited. If the voltage recovers, to within normal operating ranges, 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 ● Faulty HECU |
Detect Mode | ● Initial Check ● Outside the ABS control cycle ● Inside the ABS control cycle ● Diagnosis mode ● Failure mode | |
Enable Conditions | ● When Vign>17V is continued for 500msec, or when Vign>18V is continued for 49msec. - If the voltage returns to normal operating range, the controller is reset. | |
Fail Safe | ● System down. Both the ABS(TCS) and the EBD function are inhibited. - The valve relay and all solenoids are prevented from being switched on. ● The ABS(TCS) and the EBD warning lamps are activated. |
