Open in Main Relay 1 Circuit - Electronically Controlled Brake System

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

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.






WIRING DIAGRAM













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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (ABS MAIN RELAY)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the Active Test mode on the Techstream. Data List / Active Test

ABS / VSC / TRAC:





*: Electronically Controlled Brake System
(d) Check the operating sound of the ABS main relay when operating it with the Techstream.
OK:
The operating sound of the ABS main relay should be heard.
NG -- INSPECT ABS FUSES
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU (BS TERMINAL)





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Turn the power switch off.
(b) Clear the DTCs.
(c) Turn the power switch on (IG).
(d) Check if the same DTC is recorded.
Result:






B -- REPLACE SKID CONTROL ECU
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)
4. INSPECT ABS FUSES
(a) Turn the power switch off.





(b) Remove the ABS NO. 1, ABS NO. 2 and ABS NO. 3 fuses from the engine room relay block.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE ABS FUSES
OK -- Continue to next step.
5. INSPECT ABS MAIN RELAY (ABS NO. 1, 2)
(a) Install the ABS NO. 1, ABS NO. 2 and ABS NO. 3 fuses.





(b) Remove the ABS NO. 1 relay and ABS NO. 2 relay.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE ABS MAIN RELAY (ABS NO. 1, 2)
OK -- Continue to next step.
6. INSPECT SKID CONTROL ECU (+BI TERMINAL)





(a) Install the ABS NO. 1 relay and ABS NO. 2 relay.
(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.
(c) Disconnect the skid control ECU connectors.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (+BI CIRCUIT)
OK -- Continue to next step.
7. INSPECT SKID CONTROL ECU (RELAY TERMINAL)





(a) Reconnect the skid control ECU connectors.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE SKID CONTROL ECU
OK -- Continue to next step.
8. INSPECT SKID CONTROL ECU (BS TERMINAL)





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






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BS CIRCUIT)
OK -- REPLACE SKID CONTROL ECU