C1254

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


DESCRIPTION

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









INSPECTION PROCEDURE

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

PROCEDURE

1. READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Depress the brake pedal more than 20 times.

(d) Turn the engine switch on (IG) and turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC





(f) Check the accumulator output value.

Result





B -- REPLACE MASTER CYLINDER SOLENOID
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (MASTER CYLINDER SENSOR)

(a) Turn the engine switch off.

(b) Depress the brake pedal more than 20 times.

(c) Install the brake pedal effort gauge (SST), and bleed air.

SST : 09709-29018

(d) Turn the engine switch on (IG) and turn the Techstream on.

(e) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.

ABS/VSC/TRAC





(f) Check that the master cylinder pressure sensor output value is normal.

OK:

Master cylinder pressure sensor value is normal.

NG -- REPLACE MASTER CYLINDER SOLENOID
OK -- Continue to next step.

3. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the engine switch off.

(c) Depress the brake pedal more than 20 times.

(d) Turn the engine switch on (IG).

(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 output Reading and Clearing Diagnostic Trouble Codes.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE MASTER CYLINDER SOLENOID