Inspection Procedure

WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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

Check output value of the master cylinder pressure sensor.
Preparation:
1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main switch ON.
3. Select the DATALIST mode on the hand-held tester.
Check: that the brake fluid pressure value of the master cylinder pressure sensor displayed on the hand-held tester is changing when depressing the brake pedal.

OK: Brake fluid pressure value must be changing.

OK: Go to step 4.

If NG , go to step 2.

NOTE: Reference voltage between terminals VCM and E2: 4.7-5.3 V.

Fig 1: Testing Master Cylinder Pressure Sensor Terminals PMC & E2 Voltage

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Voltage Specifications Determined By Front Brake Caliper Pressure

Check master cylinder pressure sensor.
Preparation: Install LSPV gauge to the front caliper bleeder plug portion, and bleed the air from LSPV gauge. SST 09709-29018.

Check: Start the engine and depress the brake pedal, then check the relation between the fluid pressure and voltage of PMC and E2 terminals of the master cylinder pressure sensor with connector still connected.

OK:

NG: Replace master cylinder pressure sensor.

If OK , go to step 3.
Check for open and short circuit in harness and connector between master cylinder pressure sensor and ABS & BA & TRAC & VSC ECU. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
NG: Repair or replace harness or connector.

If OK , go to step 4.
Check whether or not the 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 steps 1-3 INSPECTION .

YES: Check and replace ABS & BA & TRAC & VSC ECU.