Toyota 4Runner: Accumulator Low Pressure (C1452)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Accumulator Low Pressure (C1452)

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
C1452	After braking, the fluid pressure inside the accumulator is below the threshold within 3.2 seconds.	Hydraulic circuit Master cylinder solenoid (Accumulator pressure sensor)

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CUSTOMER PROBLEM ANALYSIS

(a) Check with the customer to determine if frequent braking has been performed.

2.	RECONFIRM DTC

(a) Clear the DTC (See page ).

(b) Turn the ignition switch off.

(d) Turn the ignition switch to ON.

(e) Wait for 99 seconds.

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

Result

Result	Proceed to
DTC is output	A
Frequent braking was not performed and DTC is not output	B
Frequent braking was performed and DTC is not output	C

HINT:

Excessive brake pedal operation results in abnormal accumulator pressure consumption. This is normal.

USE SIMULATION METHOD TO CHECK

END

3.	CHECK HYDRAULIC CIRCUIT

(a) Check the hydraulic circuit (See page ).

OK:

Hydraulic circuit is normal (no leakage).

REPAIR HYDRAULIC CIRCUIT

4.	READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

REPLACE MASTER CYLINDER SOLENOID

5.	RECONFIRM DTC

REPLACE MASTER CYLINDER SOLENOID

USE SIMULATION METHOD TO CHECK

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