Dtc C1251/51 Open In Pump Motor Circuit

Brake. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Brake Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

RECONFIRM DTC

INSPECT FUSE (ABS1)

CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)

DTC C1251/51 Open in Pump Motor Circuit


DESCRIPTION

The motor relay (semiconductor relay) is housed in the skid control ECU and drives the pump motor based on a signal from the skid control ECU.

DTC No.
DTC Detection Condition
Trouble Area
C1251/51
When either condition below is met:
  1. Actuator pump motor does not operate properly.
  2. Open in actuator pump motor circuit continues for at least 2 seconds.
  1. Harness or connector
  2. Brake actuator (Skid control ECU)

WIRING DIAGRAM

Refer to DTC C0226/21, C0236/22, C0246/23, C0256/24 (RAV4_ACA30 RM000000OS902HX_02.html).

INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

  1. Select the Active Test, generate a control command, and then check that the ABS motor relay operates.

    Skid control ECU
    Tester Display
    		Test Parts
    		Control Range
    		Diagnosis Note
    Motor Relay
    		Turn ABS motor relay
    		ON or OFF
    		Operation sound of motor can be heard
    OK:
    Operation sound of ABS motor is heard.


NG
Go to step 3
OK


2.RECONFIRM DTC

  1. Clear the DTC (RAV4_ACA30 RM000000ONJ02UX.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 6 km/h (4 mph) or more for several seconds.

  1. Check if the same DTC is output (RAV4_ACA30 RM000000ONJ02UX.html).

    Result
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B


B
USE SIMULATION METHOD TO CHECK (RAV4_ACA30 RM00000135201PX.html)
A

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200OX.html)

3.INSPECT FUSE (ABS1)

  1. Remove the ABS1 fuse from the engine room No. 1 relay block.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE FUSE
OK


4.CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1251/51 Open In Pump Motor Circuit

  1. Disconnect the A27 ECU connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Specified Condition
    A27-2 (GND1) - Body ground
    		Below 1 Ω
    A27-24 (GND2) - Body ground
    		Below 1 Ω

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Specified Condition
    A27-23 (+BM) - Body ground
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200OX.html)