C0279

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0278/11: Open or Short Circuit in ABS Solenoid Relay Circuit

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

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

DESCRIPTION

The ABS solenoid relay is built into the master cylinder solenoid.
This relay supplies power to each ABS solenoid. If the initial check is OK, after the ignition switch is turned to ON, the relay goes on.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. INSPECT ABS SOL FUSE
(a) Remove the ABS SOL fuse from the engine room R/B.
(b) Check the ABS SOL fuse.
Standard resistance:
Below 1 Ohms

NG -- REPLACE ABS SOL FUSE
OK -- Continue to next step.

2. INSPECT SKID CONTROL ECU (+BS TERMINAL)




(a) Install the ABS SOL fuse.
(b) Disconnect the 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 (+BS CIRCUIT)
OK -- Continue to next step.

3. INSPECT SKID CONTROL ECU (GND TERMINAL)




(a) Disconnect the skid control ECU (S29) 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

HINT:
These codes are detected when a problem is determined 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) Check if the same DTCs are detected Reading and Clearing Diagnostic Trouble Codes.

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

Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- REPLACE MASTER CYLINDER SOLENOID