VACUUM WARNING SWITCH ON-VEHICLE INSPECTION


  1. INSPECT VACUUM WARNING SWITCH


    1. Depress the brake pedal several times to release the vacuum in the booster and vacuum reservoir.

    2. Depress the brake pedal and release the parking brake.

    3. Turn the ignition switch to the ON position (do not start the engine). Check that the brake warning light comes on and the vacuum warning buzzer sounds.

    4. Start the engine to create vacuum. Check that the vacuum warning buzzer stops sounding and the brake warning light goes off.

      OK
      The vacuum warning buzzer stops sounding and the brake warning light goes off.

      Tech Tips


      • When the vacuum is insufficient, the vacuum warning buzzer sounds continuously to inform the driver.

      • If the buzzer sounds intermittently and the DPF indicator light blinks after the engine is started, operate the DPF switch to combust the carbon in the exhaust DPF filter.

    5. If the vacuum warning buzzer does not sound or does not stop (keeps sounding) even after the engine is started, inspect the buzzer circuit. Click here