Inspection Procedure

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Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 2 in case of not using the TOYOTA hand-held tester.


(a) Connect the TOYOTA hand-held tester to the DLC3.

(b) Turn the ignition switch ON, and push the TOYOTA hand-held tester main switch ON.

(c) Select the DATALIST mode on the TOYOTA hand-held tester. CHECK:

Check that the brake fluid pressure value of the master cylinder pressure sensor, regulator pressure sensor, front pressure sensor and rear pressure sensor displayed on the TOYOTA hand-held tester is changing when depressing the brake pedal. OK:

Brake fluid pressure value must be changing.

Pressure sensor name

Master cylinder pressure sensor

Regulator pressure sensor


(a) Install the LSPV gauge to the front caliper bleeder plug portion, and bleed LSPV gauge.

SST 09709-29018

(b) Remove the brake ECU with connectors still connected. CHECK:

Turn the ignition switch ON and depress the brake pedal, then check the relation between the fluid pressure and voltage of terminals of each pressure sensor shown below with the connector still connected.

Pressure sensor name

Master cylinder pressure sensor

Regulator pressure sensor

Front pressure sensor

Rear pressure sensor



Front brake caliper fluid pressure



It should be taken into account that the difference in voltage between terminals is caused by the slightly different pressure applied to each pressure sensor.

4 Check whether or not the brake ECU terminal STP input voltage is changed when the stop light switch is turned on and off.

NO \ Check the stop light switch circuit (See page BE-2).

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