Item

Detecting Condition

Possible cause

DTC Strategy

? Battery Voltage Monitoring

? Open or short of power supply circuit (ABS2)

? Faulty HECU

Case1

(Motor Relay Open or Motor Short to GND)

Detect Mode

? Outside the ABS control cycle

? Inside the ABS control cycle

? Diagnosis mode

Enable Conditions

? If the motor relay is switched ON and motor voltage < (IGN voltage - 4V±0.5V) continued for 49msec, the failure is detected.

Case2

(Motor Lock)

Detect Mode

? Outside the ABS control cycle

? Diagnosis mode

Enable Conditions

? After motor relay is switched OFF, VMR is measured. If the time which VMR > 1±0.1V is less than evaluation time, recheck is performed again for a maximum of three times.

When VMR is not normal even on the third recheck, the controller recognizes it as failure.

Case3

(Motor Open, Motor Short to BATT)

Detect Mode

? Initial Check

? Outside the ABS control cycle

? Diagnosis mode

? Failure mode

Enable Conditions

? After 1.8sec from the time that motor relay is switched OFF, VMR > 4±0.5V continued for 1.8sec, the failure is detected.

Case4

(Motor Fuse Open)

Detect Mode

? Initial Check

? Outside the ABS control cycle

? Inside the ABS control cycle

? Diagnosis mode

? Failure mode

Enable Conditions

? If the motor relay is switched OFF and VMRP (Motor power supply voltage) < 4±0.5V continued for 1sec, the failure is detected.

Fail Safe

? The ABS/ESP functions are inhibited.

? The ABS/ESP warning lamps are activated and the EBD warning lamp is not activated.

? Motor failure during the ABS control cycle (Case 1, 4) :

Inhibit the ABS/ESP control of front wheels, allow the ABS/ESP control of rear wheels, and ABS/ESP warning lamps are switched on at the end of ABS control.