Intake Manifold Vacuum Inspection

Disconnect the vacuum hose and install the vacuum gauge. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
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 [SKYACTIV-G 2.5T] .)
  - Check valve (INTAKE-AIR SYSTEM) (See CHECK VALVE (INTAKE-AIR SYSTEM) REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
  - Check valve (ENGINE COMPARTMENT SIDE) (See CHECK VALVE (EMISSION SYSTEM) REMOVAL/INSTALLATION [SKYACTIV-G 2.5T] .)
  - Air suction
- Installation areas of each vacuum hose
- Installation area of dynamic pressure turbo
- Installation area of charge air cooler
- 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, -17.7 inHg}

NOTE:

Air suction can be located by the engine speed change when lubricant is sprayed on the area where suction is occurring. Check the following places:
- Air suction at throttle body, evaporative hose, vacuum hose, ventilation hose, check valve (built-into vacuum hose), fuel injector, intake manifold and PCV valve installation points
Check valve (built-into vacuum hose) (See VACUUM LINE INSPECTION [SKYACTIV-G 2.5T] .)
Engine compression (See COMPRESSION INSPECTION [SKYACTIV-G 2.5T] .)