Mazda 3 manuals

Mazda 3 Service Manual: Compression Inspection [Skyactiv G 2.0]

Mazda 3 Service Manual / Engine / General / Compression Inspection [Skyactiv G 2.0]


1. Verify that the battery is fully charged..

2. Warm up the engine to the normal operating temperature.

3. Perform “Fuel Line Safety Procedures”..

4. Remove the following parts.

a. Plug hole plate..

b. Ignition coil/ion sensors..

c. Spark plugs..

d. Fuel pump relay

e. Fuel injector relay

5. Measure the compression pressure using the following procedure.

a. Press a compression gauge into the spark plug hole.

b. Fully depress the accelerator pedal.

c. Crank the engine and measure the compression pressure.


d. Perform Steps (1) to (3) for all cylinders.

e. If the measured value is less than the minimum value, or there is a cylinder whose compression value varies from that of other cylinders by 140 kPa {1.43 kgf/cm2, 20.3 psi}

or more, add a small amount of engine oil through the spark plug hole. Then measure the compression pressure and perform the respective operations for the following cases.

f. If the measured value is high, it is possible that there is an error in the electric variable valve timing system.

6. Remove the compression gauge.

7. Install the following parts.

a. Fuel injector relay

b. Fuel pump relay

c. Spark plugs..

d. Ignition coil/ion sensors..

e. Plug hole plate..

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