C1254

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1254/54: Pressure Switch Circuit

DTC C1254/54 - Pressure Switch Circuit

DESCRIPTION

The accumulator pressure sensor is connected to the skid control ECU in the master cylinder solenoid.









INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING DATA LIST (ACCUMULATOR)
(a) Connect Techstream to the DLC3.
(b) Turn the ignition switch to OFF.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to the ON position.
(e) Select the Data List mode on Techstream.

ABS/VSC/TRAC





(f) Confirm whether the accumulator output voltage is normal.





B -- REPLACE MASTER CYLINDER SOLENOID
A -- Continue to next step.
2. READ VALUE USING DATA LIST (MASTER CYLINDER PRESSURE SENSOR)
(a) Turn the ignition switch to OFF.
(b) Depress the brake pedal more than 20 times.
(c) Install a brake pedal effort gauge (SST), and bleed air.
(d) Connect Techstream to the DLC3.
(e) Turn the ignition switch to the ON position.
(f) Select the Data List mode on Techstream.

ABS/VSC/TRAC





(g) Check that the master cylinder output value is in the Normal Condition range.
OK:
Master cylinder pressure sensor value is in the Normal Condition.
NG -- REPLACE MASTER CYLINDER SOLENOID
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTCs (Reading and Clearing Diagnostic Trouble Codes).
(b) Turn the ignition switch to OFF.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to the ON position.
(e) Wait until the pump motor stops.
(f) Depress the brake pedal and release it.
(g) Wait for 25 minutes.
(h) Check if the same DTCs are recorded.





B -- END
A -- REPLACE MASTER CYLINDER SOLENOID