When the ABS system operates, the HECU turns the ABS motor relay ON so that operates the ABS pump motor
This code shows in case that there is no signal to the motor monitering wire or an error on the motor power.
Keep a vehicle idling because the compulsive operating of the motor shall cause the discharge of the battery, when testing the actuator.
DTC No | Condition | Possible Cause |
C2402 | - If the motor relay is switched ON and motor voltage is 4V less than IGN voltage continued for 56ms, the failure is detected. - After 1.8sec from motor relay is switched OFF, the motor voltage is more than 4V continued for 1.8sec, the failure is detected. - After motor relay is switched OFF, motor voltage is measured. If the time which motor voltage less than 1V is less than evaluation time, the motor is reactivated for 500msec and the above check is performed again for a maximum of two times. When the motor voltage is not normal even on the second recheck, the controller recognizes it as failure. If the motor relay is swithched OFF and motor power supply voltage ＜ 4V continued for 200ms, the failure is detected. | - Open/short in motor regal or motor circuit. - Motor lock - Faulty HECU |
Motor error without the ABS control : only the ABS, TCS(ESP) functions are inhibited. The ABS,TCS(ESP) warning lamps are ON, but the EBD warning lamp OFF.
Motor error with the ABS control : inhibit the ABS control of front wheels, allow ABS control of the rear wheels. After the ABS control has completed, the ABS,TCS(ESP) warning lamps are ON.
CHECK POWER SOURCE OF MOTOR.
Disconnect the connector from the HECU.
Measure the voltage between the terminals 9(+) and 8(-), 24(-) of the HECU connector.
Specification: Battery positive(+)
Is the voltage within the specification?
Check ABS fuse (10A) and fusible link (30A).
Check and repair harness or connector.
▶ Check circuit for conyinuty to ground.
CHECK CIRCUIT FOR CONTINUITY TO GROUND.
Disconnect the connector from the HECU.
Measure the resistance between terminals 8(-), 24(-) of the HECU connector and the body ground.
Is the resistance below 1Ω?
▶ Check and readjust the installing of the body ground.
▶ Test motor actuation by using hi-scan (pro)
TEST MOTOR ACTUATION BY USING HI-SCAN (PRO).
Is the sound of motor operating heard?
▶ Check repair, if necessary, harness and connector.
▶ Replace the HECU then reckeck.
