Dtc C0273/13 Open In Abs Motor Relay 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

INSPECT FUSE (ABS1)

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

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

RECONFIRM DTC

DTC C0273/13 Open in ABS Motor Relay Circuit

DTC C0274/14 Short to B+ in ABS Motor Relay Circuit


DESCRIPTION

The ABS motor relay supplies the power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay ON and operates the ABS pump motor.

DTC No.
DTC Detection Condition
Trouble Area
C0273/13
When either condition below is met:
  1. All of following conditions continue for 0.2 seconds or more.
    1. IG1 terminal voltage between 9.5 V and 18.5 V.
    2. During initial check or ABS operation.
    3. Relay contact open when relay on.
  2. Both of following conditions continue for 0.12 seconds or more.
    1. IG1 terminal voltage is 9.5 V or less.
    2. Relay contact remains open when relay on.
  1. ABS1 H-fuse
  2. Harness or connector (+BM circuit)
  3. Brake actuator (Skid control ECU)
C0274/14
When motor relay off, motor relay remains closed for 4 seconds or more.
  1. ABS1 H-fuse
  2. Harness or connector (+BM circuit)
  3. Brake actuator (Skid control ECU)
HINT:
C0273/13 and C0274/14: The skid control ECU begins to detect these DTCs when the vehicle speed exceeds 6 km/h (4 mph).

WIRING DIAGRAM

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

INSPECTION PROCEDURE

1.INSPECT FUSE (ABS1)

  1. Remove the ABS1 H-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


2.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 C0273/13 Open In Abs Motor Relay Circuit

  1. Disconnect the A27 ECU connector.

  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

  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


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


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

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

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


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200OX.html)
OK


4.RECONFIRM DTC

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

  1. Start the engine.

  1. Drive the vehicle at 6 km/h (4 mph) or more to activate the initial check.

  1. Check if the same DTC(s) 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)