DTC    C0273/13    Open in ABS Motor Relay Circuit

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

DTC    C1361/91    Short Circuit in ABS Motor Fail Safe Relay Circuit

for Preparation Click here


DESCRIPTION

If a DTC of the motor line is stored, the ABS MOTOR2 relay cuts off the power supply to the ABS MOTOR1 relay and performs fail-safe.
While any of the ABS, TR(A)C, VSC, or BA is operating, the skid control ECU (housed in the actuator assembly) turns the ABS MOTOR2 relay on and activates the pump motor in the ABS and TRACTION actuator.
This code may be stored if the motor relay (+BM) voltage becomes lower than the DTC detecting condition due to insufficient output from the battery or alternator.

DTC No.
DTC Detection Condition
Trouble Area
C0273/13
When any of the following (1 or 2) is detected:
  1. All of the following conditions continue for 0.12 seconds or more.
    1. The IG1 terminal voltage is between 9.5 and 17.2 V.
    2. During initial check or ABS, BA, TR(A)C, and VSC are in operation.
    3. Relay contact is open when the relay is ON.
  2. All of the following conditions continue for 0.12 seconds.
    1. The IG1 terminal voltage is 9.5 V or less.
    2. Relay contact remains open when the relay is ON.
  1. ABS1 fuse
  2. ABS MOTOR1 relay
  3. ABS MOTOR1 relay circuit
  4. ABS and TRACTION actuator assembly
C0274/14
When the motor relay is OFF, the motor relay (ABS MOTOR1 relay) remains closed for 4 seconds or more.
  1. ABS1 fuse
  2. ABS MOTOR1 relay
  3. ABS MOTOR1 relay circuit
  4. ABS and TRACTION actuator assembly
C1361/91
Immediately after the engine switch is turned on (IG), the relay contact is closed for 4 seconds when the motor fail-safe relay (ABS MOTOR2 relay) is OFF.
  1. ABS1 fuse
  2. ABS MOTOR2 relay
  3. ABS MOTOR2 relay circuit
  4. ABS and TRACTION actuator assembly

WIRING DIAGRAM


C109387E01


INSPECTION PROCEDURE

NOTICE:
When replacing the ABS and TRACTION actuator assembly perform zero point calibration (Click here).

1.INSPECT FUSE (ABS1 FUSE)

  1. Remove the ABS1 fuse from engine room R/B (J/B) No.1.

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

    Resistance:
    Tester Connection
    		Specified Condition
    ABS1 fuse
    		Below 1 Ω (Continuity)



NG
REPLACE FUSE (ABS1 FUSE)
OK


2.INSPECT ABS MOTOR2 RELAY


    F050240E01

  1. Remove the ABS MOTOR2 relay.

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Always
    		10 kΩ or higher (No continuity)
    3 - 5
    		Apply B+ between terminal 1 and 2
    		Below 1 Ω (Continuity)



NG
REPLACE ABS MOTOR2 RELAY
OK


3.INSPECT ABS MOTOR1 RELAY


    F050241E01

  1. Remove the ABS MOTOR1 relay.

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Always
    		10 kΩ or higher (No continuity)
    3 - 5
    		Apply B+ between terminal 1 and 2
    		Below 1 Ω (Continuity)



NG
REPLACE ABS MOTOR1 RELAY
OK


4.INSPECT ENGINE ROOM RELAY BLOCK NO.3 (POWER SOURCE TERMINAL)


    C106593E04

  1. Remove the ABS MOTOR1 relay from the engine room R/B No.3.

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

    Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ABS MOTOR1 relay terminal 5 - Body ground
    		Always
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


5.INSPECT ENGINE ROOM RELAY BLOCK NO.3


    C106593E05

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

    Resistance:
    Tester Connection
    		Specified Condition
    ABS MOTOR1 relay terminal 3 - ABS MOTOR2 relay terminal 5
    		Below 1 Ω



NG
REPAIR OR REPLACE ENGINE ROOM RELAY BLOCK NO.3
OK


6.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO ENGINE ROOM RELAY BLOCK NO.3)


    C110920E02

  1. Disconnect the skid control ECU connector.

  1. Remove the ABS MOTOR1 relay and ABS MOTOR2 relay from the engine room R/B No.3.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-2 (BM) - ABS MOTOR2 relay 3
    		Below 1 Ω
    A48-14 (MRF) - ABS MOTOR1 relay 2
    		Below 1 Ω
    A48-15 (MR) - ABS MOTOR2 relay 2
    		Below 1 Ω
    A48-45 (R+) - ABS MOTOR1 relay 1
    		Below 1 Ω

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-2 (BM) - Body ground
    		10 kΩ or higher
    A48-14 (MRF) - Body ground
    		10 kΩ or higher
    A48-15 (MR) - Body ground
    		10 kΩ or higher
    A48-45 (R+) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Start the engine.

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

  1. Check that the same DTC is recorded (Click here).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.


    Result:

    Condition
    		Proceed To
    DTCs (C0273/13, C0274/14 and C1361/91) are not output
    		A
    DTCs (C0273/13, C0274/14 and C1361/91) are output
    		B

    HINT:
    1. If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) 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 harness, and fuses of the ABS and TRACTION actuator assembly. Make sure that no DTCs are output.
    3. If any DTCs are output while jiggling a connector or wire harness of the ABS and TRACTION actuator (skid control ECU), inspect and repair the connector or wire harness.



B
REPLACE ABS AND TRACTION ACTUATOR ASSEMBLY
A

END