C96169

Battery

FL MAIN

Skid Control ECU with Actuator

B L1

ALT ABS No.2Engine Room R/B and J/B

11A

WB

S1

S11

24+BM

1 2 1 2

GND2

GND1

S123

WB

WB

EA

05330DIAGNOSTICS ABS WITH EBD SYSTEM (April, 2003)

495Author: Date:

2004 COROLLA (RM1037U)

DTC C1251/51 PUMP MOTOR IS LOCKED/OPEN CIRCUITIN PUMP MOTOR GROUND

CIRCUIT DESCRIPTIONDTC No. DTC Detecting Condition Trouble Area

C1251/51ABS actuator pump motor is not operating normally duringinitial check.

ABS pump motor

WIRING DIAGRAM

057UL04

C58919GND2() +BM(+)

DIAGNOSTICS ABS WITH EBD SYSTEM (April, 2003)05331

496Author: Date:

2004 COROLLA (RM1037U)

INSPECTION PROCEDUREHINT:Start the inspection from step 1 in case of using the handheld tester and start from step 2 in case of notusing handheld tester.

1 INSPECT BRAKE ACTUATOR ASSY

(a) Select the DATALIST mode on the handheld tester.(b) Check the operation sound of the ABS pump motor when operating it with the handheld tester.

OK:The operation sound of the ABS pump motor should be heard.

OK PROCEED TO NEXT CIRCUIT INSPECTIONSHOWN ON PROBLEM SYMPTOMS TABLE

NG

2 INSPECT SKID CONTROL ECU TERMINAL VOLTAGE(+BM TERMINAL VOLTAGE)(a) Disconnect the skid control ECU connector.(b) Measure the voltage between terminal +BM (24) and

GND (23) of skid control ECU harness side connector.OK:The operation sound of the ABS pump motor shouldbe heard.

NG REPAIR OR REPLACE HARNESS ORCONNECTOR

OK

REPLACE BRAKE ACTUATOR ASSY