DTC    C1311/11    Open in Main Relay 1 Circuit

DTC    C1312/12    Short in Main Relay 1 Circuit

DTC    C1313/13    Open in Main Relay 2 Circuit

DTC    C1314/14    Short in Main Relay 2 Circuit

for Preparation Click here


DESCRIPTION

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

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C311/11
1
When either of the following is detected:
  1. Relay contact is off (BS1 terminal is less than 3.5 V) for at least 0.2 sec. when R1+ terminal voltage is 9.0 V or more and main relay 1 is on.
  2. R1+ terminal voltage is less than 9.0 V and main relay 1 cannot be on for at least 0.2 seconds when main relay 1 is turned on (BS1 terminal is 3.5 V or more).
  1. ABS MAIN1 relay
  2. Wire harness or connector
  3. Skid control ECU
C1312/12
3
Relay contact is on (BS1 terminal is 6.5 V or more) for at least 4 seconds when main relay 1 is off.
  1. ABS MAIN1 relay
  2. Wire harness or connector
  3. Skid control ECU
C1313/13
4
When any of the following is detected:
  1. Relay contact is off (BS2 terminal is less than 3.5 V) for at least 0.2 sec. when R2+ terminal voltage is 9.0 V or more and main relay 2 is on.
  2. R2+ terminal voltage is less than 9.0 V and main relay 2 cannot be on for at least 2 seconds when main relay 2 is turned on (BS1 terminal is 3.5 V or more).
  3. With the main relays 1 and 2 ON and all solenoids and the motor relay 1 and 2 not activated, the BS2 terminal voltage is lower than BS1's by 2 V or more for 1 second or more.
  4. With the solenoid OFF, the difference between BS1 and BS2 is 2 V or more for 2 seconds or more.
  1. ABS MAIN2 relay
  2. Wire harness or connector
  3. Skid control ECU
C1314/14
6
Relay contact is on (BS2 terminal is 6.5 V or more) for at least 4 sec. when main relay 2 is off.
  1. ABS MAIN2 relay
  2. Wire harness or connector
  3. Skid control ECU

WIRING DIAGRAM

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

INSPECTION PROCEDURE

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

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ECB MAIN RELAY)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Select the ACTIVE TEST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Vehicle Condition /
    Test Details
    		Diagnostic Note
    ECB Main Relay
    		Turns ECB main relay ON / OFF
    		Operation of relay
    (clicking sound) can be heard
    ECB Main Relay 2
    		Turns ECB main relay 2 ON / OFF
    		Operation of relay
    (clicking sound) can be heard

  1. Check the operation sound of the ECB main relay when operating it with the intelligent tester.

    OK:
    The operation sound of the ECB main relay should be heard.



NG
Go to step 5
OK


2.INSPECT FUSE (ABS1 AND ABS MAIN FUSES)

  1. Remove the ABS1, ABS MAIN2 and ABS MAIN3 fuses from the engine room R/B (J/B) No.1.

  1. Check the ABS1, ABS MAIN2 and ABS MAIN3 fuses.

    Resistance:
    Below 1 Ω (Continuity)



NG
REPLACE FUSE (ABS1 OR ABS MAIN FUSE)
OK


3.INSPECT ABS MAIN RELAY


    F050241E02

  1. Remove the ABS MAIN1 relay and ABS MAIN2 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 MAIN RELAY
OK


4.INSPECT SKID CONTROL ECU (DI TERMINAL)


    C110724E08

  1. Disconnect the skid control ECU (A13, A15) connectors.

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

    Voltage:
    Tester Connection
    		Specified Condition
    A13-39 (DI1) - Body ground
    		10 to 14 V
    A15-33 (DI2) - Body ground
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (DI CIRCUIT)
OK


5.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO ENGINE ROOM R/B NO.3)


    C110763E04

  1. Disconnect the skid control ECU (A13, A15) connectors.

  1. Remove the ABS MAIN1 relay and ABS MAIN2 relay.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-2 (BS1) -
    ABS MAIN1 relay (3)
    		Below 1 Ω
    A13-30 (R1+) -
    ABS MAIN1 relay (1)
    		Below 1 Ω
    A13-38 (DO1) -
    ABS MAIN1 relay (5)
    		Below 1 Ω
    A13-46 (R3+) -
    ABS MAIN1 relay (2)
    		Below 1 Ω
    A15-2 (BS2) -
    ABS MAIN2 relay (3)
    		Below 1 Ω
    A15-26 (R2+) -
    ABS MAIN2 relay (1)
    		Below 1 Ω
    A15-34 (DO2) -
    ABS MAIN2 relay (5)
    		Below 1 Ω
    A15-40 (R4+) -
    ABS MAIN2 relay (2)
    		Below 1 Ω

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-2 (BS1) - Body ground
    		10 kΩ or higher
    A13-30 (R1+) - Body ground
    		10 kΩ or higher
    A13-38 (DO1) - Body ground
    		10 kΩ or higher
    A13-46 (R3+) - Body ground
    		10 kΩ or higher
    A15-2 (BS2) - Body ground
    		10 kΩ or higher
    A15-26 (R2+) - Body ground
    		10 kΩ or higher
    A15-34 (DO2) - Body ground
    		10 kΩ or higher
    A15-40 (R4+) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.RECONFIRM DTC

  1. Clear the DTC (Click here).

  1. Turn the engine switch on (IG).

  1. Check if the same DTCs are 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 (C1311/11, C1312/12, C1313/13 and C1314/14) are not output
    		A
    DTCs (C1311/11, C1312/12, C1313/13 and C1314/14) are output
    		B



B
REPLACE SKID CONTROL ECU
A

END