Open in Main Relay 1 Circuit - Electronically Controlled Brake System

BRAKE CONTROL: ELECTRONICALLY CONTROLLED BRAKE SYSTEM: C1311/11-C1314/14: Open in Main Relay 1 Circuit
C1314/14 - Short in Main Relay 2 Circuit

DESCRIPTION

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





WIRING DIAGRAM

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

INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT FUSE (ABS1 AND ABS MAIN FUSES)

(a) Remove the ABS1, ABS MAIN2 and ABS MAIN3 fuses from the engine room No. 1 relay block (junction block).

(b) Check the ABS1, ABS MAIN2 and ABS MAIN3 fuses.

Standard resistance:

Below 1 Ohms

NG -- REPLACE FUSE (ABS1 OR ABS MAIN FUSE)
OK -- Continue to next step.

2. INSPECT ABS MAIN RELAY

(a) Remove the ABS MAIN1 relay and ABS MAIN2 relay.





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

Standard resistance:





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

3. CHECK SKID CONTROL ECU (DI CIRCUIT)

(a) Disconnect the A13 and A15 ECU connectors.





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (DI CIRCUIT)
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 3 RELAY BLOCK)

(a) Disconnect the A13 and A15 ECU connectors.





(b) Remove the ABS MAIN1 relay and ABS MAIN2 relay.

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

Standard resistance:





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

5. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the power switch ON (IG).

(c) Check if the same DTCs are recorded Reading and Clearing Diagnostic Trouble Codes.

HINT
Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result





B -- REPLACE SKID CONTROL ECU Removal

A -- END