VACUUM SENSOR ASSEMBLY ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT VACUUM SENSOR ASSEMBLY

   
   

   1. Inspect the brake booster Click here

   2. 

      Text in Illustration

      *a	Front view of wire harness connector (to Vacuum Sensor Assembly)

      Inspect the power source voltage.

      
      

      1. Disconnect the connector of the vacuum sensor assembly.

      2. Turn the ignition switch to ON.

      3. Measure the voltage according to the value(s) in the table below.

         Standard Voltage
         Tester Connection Switch Condition Specified Condition A33-3 (VC) - A33-1 (E2) Ignition Switch ON 4.75 to 5.25 V

         If the result is not as specified, check the harness, connector, and engine stop and start ECU Click here.

      4. Turn the ignition switch off.

      5. Connect the connector of the vacuum sensor.

   3. Inspect the atmospheric pressure voltage.

      
      

      1. Depress the brake pedal 5 times.

      2. Measure the PB terminal voltage at the engine stop and start ECU according to the value(s) in the table below.

         

         Text in Illustration

         *a

         Component with harness connected (Engine Stop and Start ECU)

         -

         -

         Standard Voltage
         Tester Connection Condition Specified Condition A53-20 (PB) - A53-19 (BRE2) Atmospheric pressure 3.4 to 3.8 V

         If the result is not as specified, check the harness and connector Click here.

   4. Inspect the brake negative pressure.

      
      

      1. Start the engine. Wait for several minutes and stop the engine by turning the ignition switch off.

      2. Connect the intelligent tester to the DLC3.

      3. Turn the ignition switch to ON.

      4. Turn the tester on.

      5. Enter the following menus: Powertrain / Stop and Start / Data List / Brake Boost Pressure.

      6. Depress the brake pedal 5 times and read the changes in the following pressure value.

         Tech Tips

         The changes in the value can be determined by comparing the pressure value before and after the brake pedal is depressed 5 times.

         Standard
         Tester Display Switch Condition Specified Condition Brake Boost Pressure Ignition switch ON Brake pedal depressed 5 times Changes by 20 kPa (150 mmHg, 6 in.Hg) or more

         If the result is not as specified, check the harness and connector Click here.