ELECTRONICALLY CONTROLLED BRAKE SYSTEM, Diagnostic DTC:C1311/11, C1312/12, C1313/13, C1314/14

DTC Code DTC Name
C1311/11 Open in Main Relay 1 Circuit
C1312/12 Short in Main Relay 1 Circuit
C1313/13 Open in Main Relay 2 Circuit
C1314/14 Short in Main Relay 2 Circuit

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
C1311/11 Open in Main Relay 1 Circuit 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

 Electronically controlled brake system DTC
C1312/12 Short in Main Relay 1 Circuit 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

 Electronically controlled brake system DTC
C1313/13 Open in Main Relay 2 Circuit 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

 Electronically controlled brake system DTC
C1314/14 Short in Main Relay 2 Circuit 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

 Electronically controlled brake system DTC

WIRING DIAGRAM

Refer to DTCs C1241/41 and C1242/42.

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. CHECK HARNESS AND CONNECTOR (+BI TERMINAL)


    1. B003YREC21
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)

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

    2. Disconnect the A24 and A25 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
      A24-43 (+BI1) - Body ground Always 11 to 14 V
      A25-38 (+BI2) - Body ground Always 11 to 14 V
      A24-29 (+BI3) - Body ground Always 11 to 14 V
      A25-22 (+BI4) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BI CIRCUIT)

    OK

  2. RECONFIRM DTC


    1. Reconnect the A24 and A25 skid control ECU assembly connectors.

    2. Clear the DTCs.

      Click here


      Chassis > ABS/VSC/TRC > Clear DTCs

    3. Turn the power switch off.

    4. Turn the power switch on (READY).

    5. Perform a road test.

    6. Check if the same DTC is output.

      Click here


      Chassis > ABS/VSC/TRC > Trouble Codes
      Result
      Result Proceed to
      DTCs C1311/11, C1312/12, C1313/13 and C1314/14 are not output. A
      DTCs C1311/11, C1312/12, C1313/13 and/or C1314/14 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