Pathfinder 2WD V6-4.0L (VQ40DE) (2009)
Compression Check: Testing and Inspection
COMPRESSION PRESSURE
Compression Pressure
CHECKING COMPRESSION PRESSURE
1. Warm up engine thoroughly.
2. Release fuel pressure. Refer to See: Powertrain Management/Fuel Delivery and Air Induction/Testing and Inspection/Component Tests and
General Diagnostics/Fuel Pressure Check.
3. Disconnect fuel pump fuse to avoid fuel injection during measurement.
4. Remove intake manifold collector. Refer to See: Intake Manifold/Service and Repair/Intake Manifold Collector/Removal and Installation.
5. Remove spark plug from each cylinder. Refer to See: Spark Plug/Service and Repair/Removal And Installation.
6. Connect engine tachometer (not required in use of CONSULT-III).
7. Install compression tester with adapter onto spark plug hole.
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Use compression gauge whose pick up end inserted to spark plug hole is smaller than 20 mm (0.79 in) in diameter. Otherwise, it may be caught by
cylinder head during removal.
8. Turn ignition switch to "START" for cranking. When the gauge pointer stabilizes, read the compression pressure and engine rpm. Perform these
steps to check each cylinder.
CAUTION:
Always use a fully charged battery to obtain specified engine speed.