Intake Manifold Vacuum Inspection

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the evaporative hose No. 3 (purge solenoid valve side) and install the vacuum gauge. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION .)
Verify that the intake air hoses are installed securely.
Warm up the engine.
Measure the intake manifold vacuum while idling (no load) using the vacuum gauge.
- If not within the specification, perform the following inspections.
  - Compression pressure (See COMPRESSION INSPECTION .)
  - Check valve (between intake manifold and vacuum pump) (See CHECK VALVE INSPECTION .)
  - Check valve (between vacuum pump and power brake unit) (See CHECK VALVE INSPECTION .)
  - Air suction
- Installation areas of each vacuum hose
- Installation area of throttle body
- Installation area of fuel injector
- Installation area of PCV valve
- Installation area of intake manifold
  Standard
  
  Approx. -60.0 kPa {-450.0 mmHg, -18 inHg}