Dtc C0273 Open In Abs Motor Relay Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

CHECK TERMINAL VOLTAGE (BM TERMINAL)

CHECK HARNESS AND CONNECTOR (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 system is activated, the skid control ECU (brake actuator assembly) turns the motor relay on and operates the pump motor.
The motor relay is housed in the skid control ECU in the brake actuator assembly.
If the voltage supplied to the motor relay (BM) is below the DTC detection threshold due to low voltage from the battery or generator, these DTCs may be stored.

DTC Code
DTC Detection Condition
Trouble Area
C0273
Either condition is met:
  1. All conditions are met for 0.12 seconds or more.
    1. The IG1 terminal voltage is between 9.5 and 17.2 V.
    2. Initial check is being performed and ABS, BA, TRC or VSC is operating.
    3. The relay contact is open when the relay is on.
  2. Both conditions are met for 0.12 seconds.
    1. The IG1 terminal voltage is below 9.5 V.
    2. The relay contact remains open when the relay is on.
  1. ABS NO. 1 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 to ON, the relay contact is closed for 4 seconds when the motor fail-safe relay is off.
  1. ABS NO. 1 fuse
  2. Motor fail-safe relay circuit
  3. Brake actuator assembly (Motor fail-safe relay)

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C0273 Open In Abs Motor Relay Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the brake actuator assembly, perform calibration (Toyota Fortuner RM000000XHR06WX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  3. Before disconnecting the connector, make sure that there are no problems with the connection.
  4. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
HINT:
When DTC C1241 and/or C1417 is output together with DTC C0273, C0274 and/or C1361, inspect and repair the trouble areas indicated by DTC C1241 and/or C1417 first (Toyota Fortuner RM000000XW60C1X.html and/or Toyota Fortuner RM00000368W03NX.html).
1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (MOTOR RELAY)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Active Test.

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

  1. Check the operating sound of the motor relay when operating the motor relay 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.CHECK TERMINAL VOLTAGE (BM TERMINAL)

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (brake actuator assembly) connector.



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C0273 Open In Abs Motor Relay Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S25-24 (BM) - Body ground
    		Always
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Brake Actuator Assembly])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (GND2 TERMINAL)

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (brake actuator assembly) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S25-13 (GND2) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.RECONFIRM DTC
HINT:
These codes are stored when a problem is identified in the skid control ECU (brake actuator assembly). The motor relay is in the skid control ECU (brake actuator assembly). Therefore, motor relay inspections and motor relay unit inspections cannot be performed. Be sure to check if any DTCs are output before replacing the brake actuator assembly.

  1. Clear the DTCs (Toyota Fortuner RM000000XHV0C7X.html).

  1. Turn the ignition switch off.

  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 (Toyota Fortuner RM000000XHV0C7X.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC is output
    		B
    HINT:
    1. If a speed signal of 6 km/h (4 mph) or more is input to the skid control ECU (brake actuator assembly) 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 (the trouble code is not output), slightly jiggle the connectors, wire harnesses and fuses of the skid control ECU (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 skid control ECU (brake actuator assembly), inspect and repair the connector or wire harness. The DTCs were probably stored due to a bad connection of the connector terminal.


B
REPLACE BRAKE ACTUATOR ASSEMBLY (Toyota Fortuner RM0000010K0010X.html)
A

USE SIMULATION METHOD TO CHECK (Toyota Fortuner RM0000012Q9013X.html)