ABS (Antilock Brake System)

BRAKE CONTROL: ANTI-LOCK BRAKE SYSTEM: 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

This relay supplies power to each ABS solenoid.
Immediately after the ignition switch is turned to the ON position, the relay turns on if the solenoid is determined to be normal as a result of self-diagnosis during initial check.
The relay turns off if an open / short is detected.
If the voltage supplied to the motor relay (+BS) is below the DTC detection threshold due to battery / alternator shortage, the DTCs may be stored.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT ABS NO. 1 FUSE





(a) Remove the ABS No.1 fuse from the engine room R/B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPLACE ABS NO. 1 FUSE
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU (+BS TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) 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. INSPECT SKID CONTROL ECU (GND TERMINAL)





(a) Disconnect the skid control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
4. RECONFIRM DTC
(a) Clear the DTCs (ABS (Antilock Brake System)).
(b) Drive the vehicle at a speed of 4 mph (6 km/h) or more.
(c) Are the same DTCs recorded? (ABS (Antilock Brake System))

HINT: The skid control ECU inspects the solenoid relay circuit when the stop light switch is turned off and the vehicle is running at a speed of 4 mph (6 km/h) or more.

NO -- END
YES -- REPLACE BRAKE ACTUATOR ASSEMBLY