Short to B+ in ABS Solenoid Relay Circuit - ABS (Anti-Lock Brake System) (for Sedan)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM (for Sedan): C0278/11: Open in ABS Solenoid Relay Circuit

DTC C0278/11 - Open in ABS Solenoid Relay Circuit

DTC C0279/12 - Short to B+ in ABS Solenoid Relay Circuit

DESCRIPTION

The solenoid relay supplies power to the ABS solenoid.
After the ignition switch is turned to ON, the vehicle speed has reached 3 mph (5 km/h) and the solenoid is determined to be normal by the initial check self-diagnosis, the relay switches on. If any open or short circuits are detected, the relay switches off.
These DTCs may be set if the voltage supply to the solenoid relay (+BS) falls below the DTC detection threshold due to the battery or alternator outputs being insufficient.





HINT: C0278/11 and C0279/12: The skid control ECU begins to detect these DTCs when the vehicle speed exceeds 4 mph (6 km/h).

WIRING DIAGRAM

C0226.






INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (ABS2/VSC2)




(a) Remove the ABS2/VSC2 fuse from the engine room R/ B.
(b) Measure the resistance.
Standard resistance:
Below 1 Ohms
NG -- CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (BATTERY - SKID CONTROL ECU - BODY GROUND)




(a) Disconnect the skid control ECU connector.
(b) Measure the voltage.
Standard voltage:





(c) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTC(s) ABS (Antilock Brake System) (for Sedan).
(b) Start the engine.
(c) Drive the vehicle at 4 mph (6 km/h) or more to activate the initial check.
(d) Check if the same DTC(s) is output ABS (Antilock Brake System) (for Sedan).
Result:






B -- END
A -- REPLACE BRAKE ACTUATOR