C1311

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1311/11: Open in Main Relay 1 Circuit

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

DESCRIPTION

ABS main relay 1 (ABS NO. 1 relay) supplies power to the changeover solenoid and the linear solenoid.
ABS main relay 2 (ABS NO. 2 relay) goes on for approximately 5 seconds after the power switch is turned off and the braking effort signal input is terminated. ABS main relay 2 (ABS NO. 2 relay) supplies electricity and maintains operating condition for the brake system when the power switch is OFF.






WIRING DIAGRAM













INSPECTION PROCEDURE
NOTE: When replacing the skid control ECU, perform initialization of linear solenoid valve and calibration Initialization.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ABS NO. 1 RELAY, ABS NO. 2 RELAY)
(a) Select the Active Test for the proper functioning of the ABS NO. 1 and ABS NO. 2 relays.

ABS / VSC / TRAC:





*: Electronically Controlled Brake
OK:
Operation sound of ABS NO. 1 relay and ABS NO. 2 relay should be heard.
NG -- INSPECT FUSE (ABS MAIN1, ABS MAIN2)
OK -- Continue to next step.

2. CHECK SKID CONTROL ECU (BS1, BS2 VOLTAGE)




(a) Measure the voltage of the connectors.
HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE SKID CONTROL ECU
3. INSPECT FUSE (ABS MAIN1, ABS MAIN2)




(a) Remove the ABS MAIN1 and ABS MAIN2 fuses from the engine room relay block.
(b) Measure the resistance of the fuses.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.

4. INSPECT ABS MAIN RELAY (Marking: ABS NO. 1, ABS NO. 2)




(a) Remove the ABS NO. 1 and ABS NO. 2 relays from the engine room relay block.
(b) Measure the resistance of the relays.
Standard resistance:






NG -- REPLACE RELAY
OK -- Continue to next step.

5. CHECK SKID CONTROL ECU (+BI1, +BI2 VOLTAGE)




(a) Measure the voltage of the connectors.
HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

6. CHECK SKID CONTROL ECU (+BO1, +BO2, R1+, R2+ VOLTAGE)




(a) Measure the voltage of the connectors.
HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

7. CHECK SKID CONTROL ECU (BS1, BS2 VOLTAGE)




(a) Measure the voltage of the connectors.
HINT: Measure the voltage from behind the connector with the connector connected to the skid control ECU.

Standard voltage:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- REPLACE SKID CONTROL ECU