DESCRIPTION
The solenoid relay is built into the master cylinder solenoid.
This relay supplies power to each solenoid. If the initial check is OK, after the ignition switch is turned to ON, the relay turns on.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C0278 |
Either condition is met:
|
|
C0279 |
The following condition continues for at least 0.2 seconds.
|
WIRING DIAGRAM
Refer to DTCs C0226, C0236, C0246, C0256, C1225, C1226, C1227 and C1228 (See
page ).
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK TERMINAL VOLTAGE (+BS) |
(a) Disconnect the A6 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 |
|
2. |
CHECK HARNESS AND CONNECTOR (GND1, GND2 AND GND3 TERMINAL) |
(a) Disconnect the A6 and A7 skid control ECU connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A6-1 (GND1) - Body ground |
Always |
Below 1 Ω |
A6-32 (GND2) - Body ground |
Always |
Below 1 Ω |
A7-4 (GND3) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
RECONFIRM DTC |
HINT:
These codes are stored when a problem is detected in the master cylinder solenoid.
The solenoid relay is in the master cylinder solenoid.
Therefore, solenoid relay circuit inspections and relay unit inspections cannot be performed. Be sure to check if any DTC is output before replacing the master cylinder solenoid.
(a) Clear the DTCs (See page ).
(b) Drive the vehicle at a speed of approximately 32 km/h (20 mph) or more for 60 seconds or more.
(c) Check if the same DTCs are output (See page
).
HINT:
Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.
Result
Result |
Proceed to |
---|---|
DTC is output |
A |
DTC is not output |
B |
A | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY
(a) Operate the front wipers while spraying washer fluid on the windshield
glass. Make sure that the front wipers function properly and the wipers
do not come into ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
Make sure to release the vacuum from the brake booster before removing the master
cylinder from the brake booster.
PROCEDURE
1. DRAIN BRAKE FLUID
NOTICE:
Wash off brake fluid immediately if it comes in contact w ...