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 PRESSURE SENSOR)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to ON.
(e) Turn the tester on.
(f) Select the following menu items: Chassis / ABS/VSC/TRAC/ Data List

DATA LIST: ABS/VSC/TRAC





(g) Confirm whether the accumulator output voltage is normal.
Result:






B -- REPLACE HYDRAULIC BRAKE BOOSTER
A -- Continue to next step.
2. READ VALUE USING DATA LIST (MASTER CYLINDER PRESSURE SENSOR)
(a) Turn the ignition switch off.
(b) Depress the brake pedal more than 20 times.
(c) Install a brake pedal effort gauge (SST), and bleed air.
(d) Connect the Techstream to the DLC3.
(e) Turn the ignition switch to ON.
(f) Turn the tester on.
(g) Select the following menu items: Chassis / ABS/VSC/TRAC/ Data List

DATA LIST: ABS/VSC/TRAC





(h) 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 HYDRAULIC BRAKE BOOSTER
OK -- Continue to next step.
3. RECONFIRM DTC
(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.
(b) Turn the ignition switch off.
(c) Depress the brake pedal more than 20 times.
(d) Turn the ignition switch to ON.
(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 DTC is recorded Reading and Clearing Diagnostic Trouble Codes.
Result:






B -- END
A -- REPLACE MASTER CYLINDER SOLENOID