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

Invalid Data Received from Deceleration Sensor (C1442,C1443)

DESCRIPTION The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system. DTC Code DTC Detection Condition Trou ...

Reservoir Level Switch Disconnected (C1453,C1454)

DESCRIPTION The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake fluid level drops. DTC Code DTC Detection Condition ...

Other materials about Toyota 4Runner:

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (Using SST Check Wire) (a) Check for DTCs (present trouble code). (1) Turn the ignition switch to ON and wait for approximately 60 seconds. (2) Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3. SST: 09843-18040 N ...

Reassembly
REASSEMBLY PROCEDURE 1. INSTALL FRONT PROPELLER SHAFT UNIVERSAL JOINT SPIDER BEARING HINT: Use the same procedure for all propeller shaft universal joint spider bearing. (a) Apply MP grease to a new spider and spider bearing. NOTICE: Be c ...