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 the battery voltage and alternator output 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 functions 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 |
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Battery Voltage Monitoring |
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Poor connection in power supply circuit (IGN+)
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Faulty HECU
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Discharge of electricity | |
Case1 (Low voltage) | Enable Conditions |
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When Vign<9.5V±0.5V is continued for 500msec during Vref >= 7Km/h.
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When Vign<8.5V±0.5V is continued for 500msec during Vref < 7Km/h or ABS/ESP(ESC) control. - If IGN voltage is recovered to normal operating voltage, the system recovers to normal state. | |
Fail Safe |
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Outside the ABS control cycle : Inhibit the ABS/ESP control, allow the EBD control , The ABS/ESP warning lamps are activated, When the voltage recovers the normal operating range, erase the error code.
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Inside the ABS control cycle : Inhibit the ABS/ESP control. The ABS/ESP warning lamps are activated. Althought the voltage recovers the normal operating range, warning lamps are illuminated and the error code is always stored. | ||
Case2 (Under voltage) | Enable Conditions |
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When Vign<7.2V±0.5V is continued for 56msec. - If IGN voltage is recovered to normal operating voltage, the system recovers to normal state. | |
Fail Safe |
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The ABS/EBD/ESP functions are inhibited.
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The ABS/EBD/ESP warning lamps are activated. | ||
Normal Voltage Range | ENG "ON" |
10V ~ 16V |
