Dtc C0273 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

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

INSPECT SKID CONTROL ECU (BM TERMINAL)

INSPECT SKID CONTROL ECU (GND2 TERMINAL)

RECONFIRM DTC

DTC C0273 Open in ABS Motor Relay Circuit

DTC C0274 Short in ABS Motor Relay Circuit

DTC C1361 Short in ABS Motor Fail Safe Relay Circuit


DESCRIPTION

The motor relay supplies power to the pump motor. While the brake control system is activated, the ECU turns the motor relay on and operates the 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
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 between 9.5 and 17.2 V.
    2. While initial check, or ABS, BA, TRC or VSC is operating.
    3. Relay contact remains open when the relay is ON.
  2. Both of the following conditions continue for 0.1 seconds or more.
    1. The IG1 terminal voltage is less than 9.5 V.
    2. Relay contact remains open when the relay is ON.
  1. ABS1 H-fuse
  2. Motor relay circuit
  3. Brake actuator assembly (motor relay)
C0274
When the motor relay is OFF, the motor relay remains closed for 4 seconds or more.
  1. Motor relay circuit
  2. Brake actuator assembly (motor relay)
C1361
Immediately after the ignition switch is turned on (IG), the relay contact is closed for 4 seconds when the motor fail-safe relay is OFF.
  1. ABS1 H-fuse
  2. Motor fail-safe relay circuit
  3. Brake actuator assembly (motor fail-safe relay)

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C0273 Open In Abs Motor Relay Circuit


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. When replacing the brake actuator assembly, perform zero point calibration (RAV4_ACA30 RM000001K1O00SX.html).
HINT:
When C1241 and/or C1417 is output together with C0273, C0274 and/or C1361, inspect and repair the trouble areas indicated by C1241 and/or C1417 first (RAV4_ACA30 RM000000XW6048X.html or RAV4_ACA30 RM00000368W00BX.html).
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Select the Active Test mode on the intelligent tester (RAV4_ACA30 RM000000ONK01EX.html).

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

  1. Check for operating sound of the motor relay when operating it with the intelligent tester.

    Result:
    Result
    		Proceed to
    Operating sound is not heard.
    		A
    Operating sound is heard.
    		B


B
Go to step 4
A


2.INSPECT SKID CONTROL ECU (BM TERMINAL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C0273 Open In Abs Motor Relay Circuit

  1. Make sure that there is no looseness in the locking part and connecting part of the connectors.

  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
    A67-24 (BM) - Body ground
    		Always
    		11 to 14 V


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


3.INSPECT SKID CONTROL ECU (GND2 TERMINAL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C0273 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
    A67-13 (GND2) - Body ground
    		Always
    		Below 1 Ω


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


4.RECONFIRM DTC
HINT:
This code is stored when a problem is identified in the brake actuator assembly.
The motor relay is in the brake actuator assembly.
Therefore, 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 (RAV4_ACA30 RM000000ONJ027X.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 output (RAV4_ACA30 RM000000ONJ027X.html).

    Result:

    Result
    		Proceed to
    DTCs (C0273, C0274 and C1361) are not output.
    		A
    DTCs (C0273, C0274 and/or C1361) 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 (RAV4_ACA30 RM000001XV200PX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (RAV4_ACA30 RM00000135201PX.html)