Dtc C0273/13 Open In Abs Motor Relay Circuit

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ABS NO. 1 FUSE

PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

INSPECT SKID CONTROL ECU (+BM TERMINAL)

INSPECT SKID CONTROL ECU (GND2 TERMINAL)

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 power to the ABS pump motor. While the ABS is activated, the ECU turns the motor relay on and operates the ABS pump motor.
If the voltage supplied to the motor relay (+BM) is below the DTCs detection threshold due to low voltage from the battery or alternator, these DTCs may be stored.

DTC Code
DTC Detection Condition
Trouble Area
C0273/13
Either of the following is detected:
  1. All of the following conditions continue for 0.1 seconds or more.
    1. The IG1 terminal voltage is 9.5 V or more.
    2. While initial check, or ABS or BA is operating.
    3. Relay contact is open when the relay is ON.
  2. Both of the following conditions continue for 0.1 seconds.
    1. The IG1 terminal voltage is less than 9.5 V.
    2. Relay contact remains open when the relay is ON.
  1. ABS NO. 1 fuse
  2. ABS motor relay circuit
  3. Brake actuator assembly (ABS motor relay)
C0274/14
When the motor relay is OFF, the motor relay remains closed for 4 seconds or more.
  1. ABS motor relay circuit
  2. Brake actuator assembly (ABS motor relay)

WIRING DIAGRAM


Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C0273/13 Open In Abs Motor Relay Circuit


INSPECTION PROCEDURE

HINT:
When C1241/41 is output together with C0273/13 and/or C0274/13, inspect and repair the trouble areas indicated by C1241/41 first (COROLLA_ZRE142 RM000000XW60EJX.html).
1.INSPECT ABS NO. 1 FUSE
Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Remove the ABS NO. 1 fuse from the engine room relay block.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ABS NO. 1 (50 A) fuse
    		Always
    		Below 1 Ω


NG
REPLACE ABS NO. 1 FUSE
OK


2.PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

  1. Install the ABS NO. 1 fuse.

  1. Connect the Techstream to the DLC3.

  1. Start the engine.

  1. Select Active Test mode on the Techstream (COROLLA_ZRE142 RM000000XHW0BZX.html).

    ABS/VSC/TRAC
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Motor Relay
    		ABS motor relay
    		Relay ON/OFF
    		Operating sound of motor can be heard

  1. Check the operating sound of the ABS motor relay when operating it with the Techstream.

    Result:

    Result
    		Proceed to
    The operating sound is not heard
    		A
    The operating sound is heard
    		B


B
Go to step 5
A


3.INSPECT SKID CONTROL ECU (+BM TERMINAL)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU connector.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A51-24 (+BM) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (+BM CIRCUIT)
OK


4.INSPECT SKID CONTROL ECU (GND2 TERMINAL)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C0273/13 Open In Abs Motor Relay Circuit

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A51-13 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT)
OK


5.RECONFIRM DTC
HINT:
This code is detected when a problem is identified in the brake actuator assembly.
The ABS motor relay is in the brake actuator assembly.
Therefore, ABS motor relay inspection and motor relay unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.

  1. Turn the ignition switch off.

  1. Reconnect the skid control ECU connector.

  1. Clear the DTCs (COROLLA_ZRE142 RM000000XHV0F3X.html).

  1. Start the engine.

  1. Drive the vehicle at a speed of 20 km/h (12 mph) or more for 30 seconds or more.

  1. Check if the same DTC is recorded (COROLLA_ZRE142 RM000000XHV0F3X.html).

    Result:

    Result
    		Proceed to
    DTCs (C0273/13 and C0274/14) are not output
    		A
    DTCs (C0273/13 and/or C0274/14) are output
    		B
    HINT:
    1. If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU with the ignition switch ON and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.
    2. If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly (skid control ECU), inspect and repair the connector or wire harness.
    4. It is suspected that the DTCs were output due to a bad connection of the connector terminal.


B
REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM0000013P6022X.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (COROLLA_ZRE142 RM000000XHP0ELX.html)