Component Location
General Description
The ABS ECU supplies battery power to the electric motor by way of a motor relay which is controlled by the Electronic Control Unit(ECU).
The electric motor pump supplies hydraulic pressure to all wheel brake calipers by operating the piston inside the pump.
DTC Description
The ABS ECU monitors the pump motor relay. If the ECU detects an open or short in the motor circuit, it then sets this code.
DTC Detecting Condition
Item | Detecting Condition | Possible cause |
DTC Strategy | Battery Voltage Monitoring
| Open or short of power supply circuit Blown fuse Faulty HECU |
Enable Conditions | Case1 (Motor Relay Open orMotor Short to GND) | If the motor relay is switched ON and motor voltage < (IGN voltage – 4V±0.5V) continued for 49msec, the failure is detected.
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Case2 (Motor Lock) | After motor relay is switched OFF, Voltage of motor relayis measured. If the time which Voltage of motor relay > 1±0.1V is less than evaluation time, recheck is performed again for a maximum of three times. When Voltage of motor relay is not normal even on the third recheck, the controller recognizes it as failure.
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Case3 (Motor Open, Motor Short to BATT) | After 1.8sec from the time that motor relay is switched OFF, Voltage of motor relay > 4±0.5V continued for 1.8sec, the failure is detected.
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Case4 (Motor Fuse Open) | If the motor relay is switched OFF and VMRP (Motor power supply voltage) < 4±0.5V continued for 1sec, the failure is detected.
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Fail Safe | ABS/ESP/DBC functions are inhibited, EBD function is allowed and the ABS/ESP/DBC warning lamps are activated.
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Diagnostic Circuit Diagram