DESCRIPTION
The motor relay (semiconductor relay) is built into the master cylinder solenoid and drives the pump motor based on a signal from the skid control ECU.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1257 |
There is an open in the motor system circuit (motor input circuit). |
Master cylinder solenoid (Skid control ECU) |
CAUTION / NOTICE / HINT
NOTICE:
When replacing the master cylinder solenoid, perform calibration (See page ).
PROCEDURE
1. |
CHECK PUMP MOTOR OPERATION |
(a) Turn the ignition switch off.
(b) Disconnect the A6 skid control ECU connector.
(c) Depress the brake pedal more than 40 times.
(d) Turn the ignition switch to ON.
(e) Check pump motor operation.
OK:
Pump motor operates normally.
NG |
REPLACE MASTER CYLINDER SOLENOID |
|
2. |
RECONFIRM DTC |
(a) Turn the ignition switch off.
(b) Reconnect the A6 skid control ECU connector.
(c) Turn the ignition switch to ON.
(d) Clear the DTCs (See page ).
(e) Turn the ignition switch off.
(f) Check if the same DTC is output (See page
).
Result |
Proceed to |
---|---|
DTC is output |
A |
DTC is not output |
B |
A |
REPLACE MASTER CYLINDER SOLENOID |
B |
USE SIMULATION METHOD TO CHECK |
Engine Hood Courtesy Switch Circuit
DESCRIPTION
The security courtesy switch is built into the hood lock. This switch
turns on when the engine hood is opened and turns off when the engine hood
is closed.
WIRING DIAGRAM
PROCEDURE
1.
READ VALUE USI ...
Rear Occupant Classification Sensor LH Collision Detection (B1787)
DESCRIPTION
DTC B1787 is stored when the occupant classification ECU receives a collision
detection signal, which is sent by the rear occupant classification sensor LH when
an accident occurs.
DTC B1787 is also stored when the separate type front seat cu ...