VEHICLE STABILITY CONTROL SYSTEM, Diagnostic DTC:C0273/13, C0274/14, C1361/91

DTC Code DTC Name
C0273/13 Open in ABS Motor Relay Circuit
C0274/14 Short to B+ in ABS Motor Relay Circuit
C1361/91 Short Circuit in ABS Motor Fail Safe Relay Circuit

DESCRIPTION

If a DTC of the motor line is stored, the ABS motor fail safe relay cuts off the power supply to the ABS motor relay and performs fail safe.

While any of the ABS, TRC, VSC, or BA is operating, the skid control ECU turns the ABS motor relay on and activates the pump motor in the brake actuator.

This code may be stored if the motor relay (+BM) voltage is lower than the DTC detecting condition due to insufficient output from the battery or alternator.

DTC Code DTC Detection Condition Trouble Area
C0273/13

Any of the following is detected:


  1. All of the following conditions continue for 0.12 seconds or more.


    • The IG1 terminal voltage is between 9.5 and 18.5 V.

    • During initial check, ABS, BA, TRC, or VSC are in operation.

    • Relay contact is open (MT terminal voltage is less than 3.6 V) when the ABS motor relay is ON.

  2. All of the following conditions continue for 0.12 seconds.


    • The IG1 terminal voltage is 9.5 V or less.

    • Relay contact remains open (MT terminal voltage is 8.4 V or more) when the ABS motor relay is ON.

  • ABS1 fuse

  • ABS MOTOR3 relay

  • ABS MOTOR3 relay circuit

  • Brake actuator assembly

  • Skid control ECU
C0274/14 When the ABS motor relay is OFF, the relay remains closed (MT terminal voltage is 8.4 V or more) for 4 seconds or more.

  • ABS1 fuse

  • ABS MOTOR3 relay

  • ABS MOTOR3 relay circuit

  • Brake actuator assembly

  • Skid control ECU
C1361/91 Immediately after the engine switch is turned on (IG), the relay contact is closed (MT terminal voltage is 8.4 V or more) for 4 seconds when the ABS motor fail safe relay is OFF.

  • ABS1 fuse

  • ABS MOTOR1 (fail safe) relay

  • ABS MOTOR1 (fail safe) relay circuit

  • Brake actuator assembly

  • Skid control ECU

WIRING DIAGRAM

A0162C2E01

INSPECTION PROCEDURE

Note

When replacing the skid control ECU, perform zero point calibration and store system information Click here.

PROCEDURE


  1. INSPECT ABS1 FUSE


    1. A0162HCE01

      Remove the ABS1 fuse from engine room No. 1 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ABS1 (50A) fuse Always Below 1 Ω

    NG

    REPLACE ABS1 FUSE

    OK

  2. INSPECT ABS MOTOR RELAY (ABS MOTOR3)


    1. A015Z0QE09

      Install the ABS1 fuse.

    2. Remove the ABS MOTOR3 relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ABS MOTOR RELAY (ABS MOTOR3)

    OK

  3. INSPECT ABS MOTOR RELAY (ABS MOTOR1 (FAIL SAFE))


    1. A01632CE07

      Remove the ABS MOTOR1 (fail safe) relay.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage is not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage is applied between terminals 1 and 2 Below 1 Ω

    NG

    REPLACE ABS MOTOR RELAY (ABS MOTOR1 (FAIL SAFE))

    OK

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


    1. A0161NGE04

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      ABS MOTOR1 (fail safe) relay terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

  5. INSPECT ENGINE ROOM NO. 3 RELAY BLOCK


    1. A0161NGE10

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ABS MOTOR1 (fail safe) relay terminal 1 - ABS MOTOR3 relay terminal 1 Always Below 1 Ω
      ABS MOTOR1 (fail safe) relay terminal 1 - Body ground Always 10 kΩ or higher
      ABS MOTOR1 (fail safe) relay terminal 3 - ABS MOTOR3 relay terminal 5 Always Below 1 Ω
      ABS MOTOR1 (fail safe) relay terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE ENGINE ROOM NO. 3 RELAY BLOCK

    OK

  6. INSPECT BRAKE ACTUATOR ASSEMBLY


    1. A0162ULE08

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the brake actuator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (BM) - 30 (MT) Always 0.92 to 1.12 kΩ

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    OK

  7. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR - ENGINE ROOM NO. 3 RELAY BLOCK)


    1. A0160L0E04

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A13-2 (BM) - ABS MOTOR3 relay terminal 3 Always Below 1 Ω
      A13-2 (BM) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE ACTUATOR)


    1. A01626RE07

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the skid control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J78-15 (MT) - A13-30 (MT) Always Below 1 Ω
      J78-15 (MT) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A015YIEE01

      Make sure that there is no looseness at the locking part and the connecting part of the connector.

    2. Disconnect the skid control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A35*1, J98*2-3 (MR) - ABS MOTOR3 relay terminal 2 Always Below 1 Ω
      A35*1, J98*2-3 (MR) - Body ground Always 10 kΩ or higher
      A35*1, J98*2-11 (R+) - ABS MOTOR1 (fail safe) relay terminal 1 Always Below 1 Ω
      A35*1, J98*2-11 (R+) - Body ground Always 10 kΩ or higher
      J78-1 (MRF) - ABS MOTOR1 (fail safe) relay terminal 2 Always Below 1 Ω
      J78-1 (MRF) - Body ground Always 10 kΩ or higher

      *1: for LHD

      *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. RECONFIRM DTC


    1. Clear the DTCs Click here.

    2. Start the engine.

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

    4. Check if the same DTC is recorded Click here.

      Tech Tips

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

      Result
      Result Proceed to
      DTCs (C0273/13, C0274/14 and C1361/91) are not output A
      DTCs (C0273/13, C0274/14 and/or C1361/91) are output B

      Tech Tips


      • If a speed signal of 6 km/h (4 mph) 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.

      • If the normal system code is output (no trouble codes are output), slightly jiggle the connectors, wire harness, and fuses of the skid control ECU and/or brake actuator assembly. Make sure that no DTCs are output.

      • If any DTCs are output while jiggling a connector or wire harness of the skid control ECU and/or brake actuator assembly, inspect and repair the connector or wire harness.

      • It is suspected that the DTCs were output due to a bad connection of the connector terminal.


    B

    REPLACE SKID CONTROL ECU Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) Click here