DTC    C0273/13    Open in ABS Motor Relay Circuit

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

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DESCRIPTION

The ABS motor relay supplies 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 of following is detected:
1. Both conditions continue for at least 0.2 seconds
  1. IG1 voltage is between 10 and 16 V
  2. Relay contact is open when relay is ON
2. Both conditions continue for at least 0.2 seconds
  1. IG1 voltage is between 10 V
  2. Relay contact remains open when relay is ON
  1. Brake actuator assembly (ABS motor relay)
  2. ABS motor relay circuit
C0274/14
Relay contact is closed when relay is OFF for at least 4 seconds
  1. Brake actuator assembly (ABS motor relay)
  2. ABS motor relay circuit

WIRING DIAGRAM


C108862E02


INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

  1. Choose the diagnosis method.
    Method 
    Method
    		Proceed to
    Using intelligent tester
    		A
    Not using intelligent tester
    		B



B
Go to step 3
A


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY)

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

    Skid control ECU 
    Item
    		Vehicle Condition / Test Details
    		Diagnostic Note
    ABS Motor Relay
    		Turns ABS motor relay ON / OFF
    		Operation sound of motor can be heard

    OK:
    Operation sound of ABS motor is heard.



NG
Go to step 5
OK


3.INSPECT SKID CONTROL ECU CONNECTOR

  1. Check the ECU connector's connecting condition.

    OK:
    Connector is securely connected.



NG
CONNECT CONNECTOR TO ECU CORRECTLY
OK


4.RECONFIRM DTC

HINT:
These codes are output when a problem is detected in the brake actuator assembly.
As the ABS motor relay is built into the brake actuator assembly, ABS motor relay and solenoid unit inspection cannot be performed.
Be sure to check if the DTC is output before replacing the brake actuator assembly.

  1. Clear the DTCs.

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

  1. Check for DTCs.
    Result 
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B



B
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY 

5.INSPECT FUSE (ALT, ABS NO. 1)

  1. Remove the ALT and ABS NO. 1 H-fuses from the engine room junction block.

  1. Measure the resistance of the H-fuses.

    Standard resistance:
    Below 1 Ω



NG
REPLACE FUSE
OK


6.CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)
C108884E01

  1. Disconnect the S2 ECU connector.

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

    Standard voltage:
    Tester Connection
    		Specified Condition
    S2-23 (+BM) - Body ground
    		10 to 14 V

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    S2-2 (GND1) - Body ground
    		Below 1 Ω
    S2-24 (GND2) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


7.RECONFIRM DTC

HINT:
These codes are output when a problem is detected in the brake actuator assembly.
As the ABS motor relay is built into the brake actuator assembly, ABS motor relay and solenoid unit inspection cannot be performed.
Be sure to check if the DTC is output before replacing the brake actuator assembly.

  1. Clear the DTCs.

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

  1. Check for DTCs.
    Result 
    Result
    		Proceed to
    DTC is output
    		A
    DTC is not output
    		B



B
END
A

REPLACE BRAKE ACTUATOR ASSEMBLY