Toyota 4Runner manuals

Toyota 4Runner: Pressure Sensor or Switch (C1254)

DESCRIPTION

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


DTC Code

DTC Detection Condition

Trouble Area

C1254

There is an accumulator pressure sensor malfunction (the fluid pressure does not change when the pump operates or when the brake is applied).

Master cylinder solenoid (Accumulator pressure sensor)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the master cylinder solenoid, perform calibration (See page ).


PROCEDURE

1.

READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Depress the brake pedal more than 40 times.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Accumulator Sensor

Accumulator pressure sensor reading/ Min.: 0.00 V, Max.: 5.00 V

3.58 to 5 V

If the value is constant regardless of the pump operation, an accumulator pressure sensor malfunction is suspected.

(g) Check the accumulator output value.

Result

Result

Proceed to

Output value is within "Normal Condition" range

A

Output value is out of "Normal Condition" range

B

Output value is constant regardless of pump operation


B

REPLACE MASTER CYLINDER SOLENOID

A

2.

RECONFIRM DTC

(a) Clear the DTCs (See page ).


(b) Turn the ignition switch off.

(c) Depress the brake pedal more than 40 times.

(d) Turn the ignition switch to ON.

(e) Wait until the pump motor stops.

(f) Wait for 15 minutes.

(g) Depress the brake pedal and release it.

(h) Check if the same DTC is output (See page
).

Result

Result

Proceed to

DTC is output

A

DTC is not output

B


A

REPLACE MASTER CYLINDER SOLENOID


B

USE SIMULATION METHOD TO CHECK

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