Anti-Lock Brake System

BRAKE CONTROL: 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. If the ABS initial check is OK after the ignition switch is turned on (IG), the skid control ECU will turn the ABS solenoid relay on.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- When C1241/41 is output together with C0278/11, inspect and repair the trouble areas indicated by C1241/41 C1241.
- Check the condition of each related circuit before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. INSPECT FUSIBLE LINK (ABS NO. 2 FUSE)




(a) Remove the fusible link from the engine room R/B.
(b) Check if the fusible link is melted.
OK:
The fusible link is not melted.
(c) Install the fusible link to the engine room R/B with the nut.
Torque: 5.4 Nm (55 kgf-cm, 48 in-lbf)
NG -- REPLACE FUSIBLE LINK
OK -- Continue to next step.
2. INSPECT SKID CONTROL ECU CONNECTOR (+BS CIRCUIT)




(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 CONTINUITY)




(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(b) Connect the connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
4. RECONFIRM DTC
HINT:
This code is detected when a problem is identified in the brake actuator assembly.
The solenoid circuit is in the brake actuator assembly.
Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if the DTC is output before replacing the brake actuator assembly.
(a) Clear the DTC ABS (Antilock Brake System).
(b) Start the engine.
(c) Drive the vehicle at a speed of 12 mph (20 km/h) or more for 30 seconds or more.
(d) Check if the same DTC is recorded ABS (Antilock Brake System).
HINT: Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result:





HINT:
- If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output.
- If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness.
- It is suspected that the DTCs were output due to a bad connection of the connector terminal.

B -- REPLACE BRAKE ACTUATOR ASSEMBLY
A -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)