Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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
  • Accumulator pressure sensor (master cylinder solenoid)

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (master cylinder solenoid), perform calibration (See page PROCEDURE PROCEDURE ).

PROCEDURE

1.

CUSTOMER PROBLEM ANALYSIS

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

NEXT

2.

RECONFIRM DTC

(a) Clear the DTC (See page ). (b) Turn the ignition switch off. ).

(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

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

3.

CHECK HYDRAULIC CIRCUIT

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

OK:

Hydraulic circuit is normal (no leakage).

NG

REPAIR HYDRAULIC CIRCUIT

OK

4.

READ VALUE USING TECHSTREAM (ACCUMULATOR SENSOR)

NG

REPLACE MASTER CYLINDER SOLENOID

OK

5.

RECONFIRM DTC

(a) Clear the DTCs (See page ). (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

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

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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Other materials:

Parts Location
PARTS LOCATION ILLUSTRATION *A for Vacuum Brake Booster *B for Hydraulic Brake Booster *1 BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) *2 BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) ...

Removal
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Installation
INSTALLATION CAUTION / NOTICE / HINT PROCEDURE 1. INSTALL REAR AIRBAG SENSOR LH (a) Check that the ignition switch is OFF. (b) Check that the cable is disconnected from the battery negative (-) terminal. CAUTION: After disconnecting the cable from the terminal, wait for at least 90 seconds ...

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