C0279

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C0278/11,C0279/12: Open or Short Circuit in ABS Solenoid Relay Circuit


DESCRIPTION

The solenoid relay is built into the master cylinder solenoid.

This relay supplies power to each solenoid. If the initial check is OK, after the engine switch is turned on (IG), the relay turns on.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
When replacing the master cylinder solenoid, perform zero point calibration Programming and Relearning.

PROCEDURE

1. INSPECT ABS2 FUSE

(a) Remove the ABS2 fuse from the engine room relay block.





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

Standard Resistance:





NG -- REPLACE ABS2 FUSE
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (+BS TERMINAL)

(a) Install the ABS2 fuse.





(b) Disconnect the A24 skid control ECU connector.

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

Standard Voltage:





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

3. INSPECT SKID CONTROL ECU (GND TERMINAL)

(a) Disconnect the A24 and A25 skid control ECU connectors.





(b) 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.

4. RECONFIRM DTC

HINT
These codes are stored when a problem is detected in the master cylinder solenoid.

The ABS solenoid relay is in the master cylinder solenoid.

Therefore, solenoid relay circuit inspection and relay unit inspection cannot be performed. Be sure to check if any DTC is output before replacing the master cylinder solenoid.

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

(b) Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.

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

HINT
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE MASTER CYLINDER SOLENOID