Toyota 4Runner Quiz
Brake

Accumulator Low Pressure (C1452)

In this manual: Brake
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~1min read
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.

NEXT

  1. RECONFIRM DTC

(a) Clear the DTC (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 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.


B

USE SIMULATION METHOD TO CHECK

C

END
A

  1. CHECK HYDRAULIC CIRCUIT

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


OK:

Hydraulic circuit is normal (no leakage).


NG

REPAIR HYDRAULIC CIRCUIT
OK

  1. READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)



NG

REPLACE MASTER CYLINDER SOLENOID
OK

  1. RECONFIRM DTC



A

REPLACE MASTER CYLINDER SOLENOID

B

USE SIMULATION METHOD TO CHECK

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