COMPRESSION INSPECTION [SKYACTIV-X 2.0]

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Warning

•  A hot engine can cause severe burns. Turn off the engine and wait until it is cool before removing/installing each part.

•  Fuel vapor is hazardous. It can very easily ignite and cause serious injury or death, and damage to equipment. Always keep sparks and flames away from fuel.

•  Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the [Fuel Line Safety Procedure] to prevent the fuel from spraying.

―  Fuel may cause irritation if it comes in contact with skin and eyes.

―  If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.

1.  Verify that the battery is in a completely charged condition. (See BATTERY INSPECTION [(E)].)

2.  Connect the M-MDS to the DLC-2.

3.  Warm up the engine.

4.  Display the following PCM PID using the M-MDS data monitor function. (See PID/DATA MONITOR INSPECTION.)(See PID/DATA MONITOR TABLE [PCM (SKYACTIV-X)].)

•  RPM

5.  Remove the fuel pump relay. (See BEFORE SERVICE PRECAUTION [SKYACTIV-X 2.0].)

6.  Open the engine cover. (See ENGINE COVER OPEN/CLOSE [SKYACTIV-X 2.0].)

7.  Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

8.  Remove the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

9.  Measure the compression pressure using the following procedure.

(1)  Install the compression gauge to the spark plug hole.

(2)  Fully depress the accelerator pedal.

Note

•  The cranking method is as follows.

MTX

―  When the ignition switch is pressed with the clutch pedal depressed, cranking starts.

―  When your foot is removed from the clutch pedal during cranking, cranking stops.

―  When the ignition switch is pressed during cranking, cranking stops.

ATX

―  When the ignition switch is pressed with the brake pedal depressed, cranking starts.

―  When the ignition switch is pressed during cranking, cranking stops.

(3)  Crank the engine and measure the following values simultaneously.

•  Compression pressure

•  Engine speed

Compression pressure (Compression ratio of 15)

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Standard: Refer to graph

Minimum: Refer to graph

Difference between cylinders: Within 152 kPa {1.55 kgf/cm², 22.0 psi}[250 rpm]

Compression pressure (Compression ratio of 16.3)

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Standard: Refer to graph

Minimum: Refer to graph

Difference between cylinders: Within 156 kPa {1.59 kgf/cm², 22.6 psi}[250 rpm]

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

(5)  If a measured value is less than the minimum specification, or the difference between cylinders exceeds the specified value, the following conditions could be present. Perform overhaul servicing.

•  Wear or damage of piston ring and cylinder wall surface

•  Valve seizure, valve attachment failure, or pressure leakage from cylinder head gasket

(6)  If a measured value is high, a malfunction in the electric variable valve timing system can be considered.

10.  Remove the compression gauge.

11.  Install the spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

12.  Install the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)

13.  Close the engine cover. (See ENGINE COVER OPEN/CLOSE [SKYACTIV-X 2.0].)

14.  Install the fuel pump relay. (See BEFORE SERVICE PRECAUTION [SKYACTIV-X 2.0].)