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 1 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 Code INF Code DTC Detection Condition Trouble Area
C1311/11 1

Either of the following is detected:


  1. Relay contact is off (BS01 terminal is less than 3.5 V) for at least 0.2 seconds when +BI1 terminal voltage is 7.9 V or more and ABS main relay 1 is on.

  2. +BI1 terminal voltage is less than 7.9 V and ABS main relay 1 cannot be on for at least 0.2 seconds when ABS main relay 1 is turned on (BS01 terminal is 3.5 V or more).

  • ABS main relay 1 circuit

  • Skid control ECU
C1312/12 3 Relay contact is on (BS01 terminal is 6.5 V or more) for at least 1 second when ABS main relay 1 is off. ↑
C1313/13 4

Either of the following is detected:


  1. Relay contact is off (BS02 terminal is less than 3.5 V) for at least 0.2 seconds when +BI2 terminal voltage is 7.9 V or more and ABS main relay 2 is on.

  2. +BI2 terminal voltage is less than 7.9 V and ABS main relay 2 cannot be on for at least 2 seconds when ABS main relay 2 is turned on (BS02 terminal is 3.5 V or more).

  • ABS main relay 2 circuit

  • Skid control ECU
C1314/14 6 Relay contact is on (BS02 terminal is 6.5 V or more) for at least 1 second when ABS main relay 2 is off. ↑

WIRING DIAGRAM

Refer to DTCs C1241/41 and C1242/42 Click here.

INSPECTION PROCEDURE

Note

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

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS MAIN RELAY)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Select the Active Test on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Test Part Control Range Diagnostic Note
      ECB* Main Relay ABS main relay Relay ON/OFF -
      ECB* Main Relay2 ABS main relay 2 Relay ON/OFF -

      *: Electronically Controlled Brake System

    4. Select the Data List on the intelligent tester Click here.

      ABS/VSC/TRC
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      ECB* Main Relay ABS main relay / ON or OFF

      ON: Main relay ON

      OFF: Main relay OFF

      		 -
      ECB* Main Relay2 ABS main relay 2 / ON or OFF

      ON: Main relay ON

      OFF: Main relay OFF

      		 -

      *: Electronically Controlled Brake System

    5. Check the operating condition of the ABS main relay when operating it using the intelligent tester.

      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

    INSPECT ECB* MAIN FUSES Click here

    A

  2. INSPECT SKID CONTROL ECU (BS TERMINAL)


    1. A01NDO9E26
      Text in Illustration
      *1

      Component with harness connected

      (Skid Control ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A89-3 (BS01) - Body ground Power switch on (IG) 8.8 to 14 V
      A92-7 (BS02) - Body ground Power switch on (IG) 8.8 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)

    OK

  3. RECONFIRM DTC


    1. Turn the power switch off.

    2. Clear the DTCs Click here.

    3. Turn the power switch on (IG).

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

      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

    B

    REPLACE SKID CONTROL ECU Click here

    A

    CHECK FOR INTERMITTENT PROBLEMS Click here

  4. INSPECT ECB* MAIN FUSES


    1. A01NDUME01
      Text in Illustration
      *1 Engine Room No. 3 Relay Block
      *2 ECB* MAIN NO. 1 Fuse
      *3 ECB* MAIN NO. 2 Fuse

      Turn the power switch off.

    2. Remove the ECB* MAIN NO. 1 and ECB* MAIN NO. 2 fuses from the engine room No. 3 relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      ECB* MAIN NO. 1 (10 A) fuse Always Below 1 Ω
      ECB* MAIN NO. 2 (10 A) fuse Always Below 1 Ω

      *: Electronically Controlled Brake System


    NG

    REPLACE ECB* MAIN FUSES

    OK

  5. INSPECT SKID CONTROL ECU (+BI TERMINAL)


    1. A01NETKE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      Install the ECB* MAIN NO. 1 and ECB* MAIN NO. 2 fuses.

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

    3. Disconnect the skid control ECU connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A90-4 (+BI1) - Body ground Always 11 to 14 V
      A92-5 (+BI2) - Body ground Always 11 to 14 V

      *: Electronically Controlled Brake System


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (+BI CIRCUIT)

    OK

  6. INSPECT SKID CONTROL ECU (BS TERMINAL)


    1. A01NDO9E27
      Text in Illustration
      *1

      Component with harness connected

      (Skid Control ECU)

      Reconnect the skid control ECU connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A89-3 (BS01) - Body ground Power switch on (IG) 8.8 to 14 V
      A92-7 (BS02) - Body ground Power switch on (IG) 8.8 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)

    OK

    REPLACE SKID CONTROL ECU Click here