ABS (Antilock Brake System)

ANTI-LOCK BRAKE SYSTEM: C0278/11: Open or Short Circuit in ABS Solenoid Relay Circuit

DTC C0278/11 - Open or Short Circuit in ABS Solenoid Relay Circuit

DESCRIPTION

This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the ABS initial check is OK, skid control ECU makes ABS solenoid relay turn ON.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT ABS NO. 2 FUSE





(a) Remove the ABS No. 2 fuse from the engine room J/B.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





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





(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 CONNECTOR (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
OK -- Continue to next step.
4. RECONFIRM DTC

HINT: This code is detected when a problem is determined in the brake actuator assembly.

The ABS Solenoid Relay is in the brake actuator assembly.

Therefore, ABS Solenoid Relay inspection and relay unit inspection cannot be performed. Be sure to check if the DTC code is output before replacing the brake actuator assembly.

(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))

Result:





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

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- REPLACE BRAKE ACTUATOR ASSEMBLY