Toyota 4Runner manuals

Toyota 4Runner: 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

Trouble Area

C1453

With the ECU terminal IG1 voltage at 10 to 14 V, an open in the brake fluid level warning switch circuit continues for 2 seconds or more.

  • Brake fluid level
  • Brake fluid level warning switch (Brake master cylinder reservoir assembly)
  • Harness or connector
  • Master cylinder solenoid (Skid control ECU)

C1454

The fluid level of the reservoir is LOW for 40 seconds after the ignition switch is turned to ON, or for 7 seconds during pump motor operation.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.

CHECK BRAKE FLUID LEVEL

(a) Turn the ignition switch off.

(b) Depress the brake pedal 40 times or more (until the pedal reaction feels light and pedal stroke becomes longer).

(c) Check the amount of fluid in the brake reservoir.

HINT:

When the ignition switch is turned to ON, brake fluid is sent to the accumulator and the fluid level decreases by approximately 5 mm (0.197 in.) from the level when the ignition switch is off (normal).

OK:

Brake fluid level is normal.


NG

CHECK AND REPAIR BRAKE FLUID LEAKAGE

OK

2.

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(a) Disconnect the A8 brake fluid level warning switch connector.

(b) Measure the resistance according to the value(s) in the table below.

HINT:

A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (GND) - 2 (LBL)

Float UP (Switch off)

1.9 to 2.1 kΩ

Float DOWN (Switch on)

Below 1 Ω

Text in Illustration

*a

Component without harness connected

(Brake Fluid Level Warning Switch)

HINT:

If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.



NG

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY

OK

3.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH)

(a) Disconnect the A6 skid control ECU connector.

(b) Disconnect the A8 brake fluid level warning switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A6-41 (LBL) - A8-2 (LBL)

Always

Below 1 Ω

A6-41 (LBL) - Body ground

Always

10 kΩ or higher

A8-1 (GND) - Body ground

Always

Below 1 Ω


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

RECONFIRM DTC

(a) Clear the DTCs (See page ).


(b) Turn the ignition switch off.

(c) Start the engine and idle it for approximately 40 seconds.

(d) Check if the same DTCs are output.

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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