ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1311, C1312, C1313, C1314

DTC Code DTC Name
C1311 Open Circuit in Main Relay 1
C1312 Short Circuit in Main Relay 1
C1313 Open Circuit in Main Relay 2
C1314 Short Circuit in Main Relay 2

DESCRIPTION

The ABS main relay supplies power to the changeover solenoid and the linear solenoid.

The ABS main relay remains on for approximately 2 minutes after the power switch is turned off and the input of brake pedal operation signals stops, and supplies power to the system to keep it ready to operate.

DTC No. Detection Item INF Code DTC Detection Condition Trouble Area Note
C1311 Open Circuit in Main Relay 1 1

Either of the following is detected:


  1. The ABS main relay 1 contact is not turned ON (BS01 terminal voltage less than 3.5 V) for 0.2 seconds or more when the ABS main relay 1 ON is requested while +BI1 terminal voltage is 7.5 V or more.

  2. When terminal +BI1 voltage is less than 7.5 V and the ABS main relay 1 contact is not turned ON (BS01 terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay 1 ON is requested.

  • Open or short in ABS main relay 1 circuit

  • Skid control ECU assembly

 -
C1312 Short Circuit in Main Relay 1 3 The ABS main relay 1 contact is turned ON (BS01 terminal voltage 6.5 V or more) for 1 second or more when the ABS main relay 1 OFF is requested.

  • Short in ABS main relay 1 circuit

  • ABS main relay 1 internal stuck

  • Skid control ECU assembly

 -
C1313 Open Circuit in Main Relay 2 4

Either of the following is detected:


  1. The ABS main relay 2 contact is not turned ON (BS02 terminal voltage less than 3.5 V) for 0.2 seconds or more when the ABS main relay 2 ON is requested while +BI2 terminal voltage is 7.5 V or more.

  2. When terminal +BI2 voltage is less than 7.5 V and the ABS main relay 2 contact is not turned ON (BS02 terminal voltage 3.5 V or more) for 0.2 seconds or more when the ABS main relay 2 ON is requested.

  • Open or short in ABS main relay 2 circuit

  • Skid control ECU assembly

 -
C1314 Short Circuit in Main Relay 2 6 The ABS main relay 2 contact is turned ON (BS02 terminal voltage 6.5 V or more) for 1 second or more when the ABS main relay 2 OFF is requested.

  • Short in ABS main relay 2 circuit

  • ABS main relay 2 internal stuck

  • Skid control ECU assembly

 -
DTC Detection Conditions: C1311 INF Code: 1
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition +BI1 terminal voltage is 7.5 V or more ○ -
ABS main relay 1 on - ○
Malfunction Status With the ABS main relay 1 on, the relay contact is off (BS01 terminal voltage is less than 3.5 V) ○ -
The relay contact does not turn on (BS01 terminal voltage 3.5 V or more) while +BI1 terminal voltage is less than 7.5 V - ○
Detection Time 0.2 seconds or more 0.2 seconds or more
Number of Trips 1 trip 1 trip
DTC Detection Conditions: C1313 INF Code: 4
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition +BI2 terminal voltage is 7.5 V or more ○ -
ABS main relay 2 on - ○
Malfunction Status With the ABS main relay 2 on, the relay contact is off (BS02 terminal voltage is less than 3.5 V) ○ -
The relay contact does not turn on (BS02 terminal voltage 3.5 V or more) while +BI2 terminal voltage is less than 7.5 V - ○
Detection Time 0.2 seconds or more 0.2 seconds or more
Number of Trips 1 trip 1 trip

WIRING DIAGRAM

Refer to DTCs C1241 and C1242.

Click here

CAUTION / NOTICE / HINT

Note


  • When replacing the skid control ECU assembly, perform initialization and calibration of the linear solenoid valve.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. PERFORM ACTIVE TEST USING GTS (ABS MAIN RELAY)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      ECB Main Relay ABS main relay 1 Relay ON/OFF ECB: Electronically Controlled Brake System
      ECB Main Relay2 ABS main relay 2 Relay ON/OFF ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      ECB Main Relay

      ECB: Electronically Controlled Brake System


      Chassis > ABS/VSC/TRC > Active Test
      Tester Display
      ECB Main Relay2

      ECB: Electronically Controlled Brake System

    4. Select the Data List on the GTS.

      Click here


      Chassis > ABS/VSC/TRC > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      ECB Main Relay ABS main relay 1 ON or OFF

      ON: Relay on

      OFF: Relay off

      		 ECB: Electronically Controlled Brake System
      ECB Main Relay2 ABS main relay 2 ON or OFF

      ON: Relay on

      OFF: Relay off

      		 ECB: Electronically Controlled Brake System

      Chassis > ABS/VSC/TRC > Data List
      Tester Display
      ECB Main Relay
      ECB Main Relay2

      ECB: Electronically Controlled Brake System

    5. Check that the condition of the ABS main relay observed on the GTS changes according to GTS operation.

      Result
      Result Proceed to
      ABS main relay in the Data List turns ON/OFF using the Active Test. A
      ABS main relay in the Data List does not change using the Active Test. B

    B

    CHECK HARNESS AND CONNECTOR (+BI TERMINAL) Click here

    A

  2. INSPECT SKID CONTROL ECU ASSEMBLY (SOLENOID POWER SUPPLY OUTPUT TERMINAL)


    1. B004YC8C28
      *a

      Component with harness connected

      (Skid Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-3 (BS01) - Body ground Approximately 1.5 seconds after turning power switch on (IG) 8.8 to 14 V
      A13-7 (BS02) - Body ground Approximately 1.5 seconds after turning power switch on (IG) 8.8 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SOLENOID POWER SUPPLY OUTPUT CIRCUIT)

    OK

  3. RECONFIRM DTC


    1. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    2. Turn the power switch off.

    3. Turn the power switch on (IG).

    4. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1311, C1312, C1313 and C1314 are not output. A
      DTCs C1311, C1312, C1313 and/or C1314 are output. B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

  4. CHECK HARNESS AND CONNECTOR (+BI TERMINAL)


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

    2. Disconnect the A11 and A13 skid control ECU assembly connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A11-4 (+BI1) - Body ground Always 11 to 14 V
      A13-5 (+BI2) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BI CIRCUIT)

    OK

  5. INSPECT SKID CONTROL ECU ASSEMBLY (SOLENOID POWER SUPPLY OUTPUT TERMINAL)


    1. B004YC8C28
      *a

      Component with harness connected

      (Skid Control ECU Assembly)

      Reconnect the A10 and A13 skid control ECU assembly connectors.

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A10-3 (BS01) - Body ground Approximately 1.5 seconds after turning power switch on (IG) 8.8 to 14 V
      A13-7 (BS02) - Body ground Approximately 1.5 seconds after turning power switch on (IG) 8.8 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY for LHD: Click here
    REPLACE SKID CONTROL ECU ASSEMBLY for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SOLENOID POWER SUPPLY OUTPUT CIRCUIT)