COMPRESSION INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5]

id0110h6800300

Warning
•  Hot engines and oil can cause severe burns. Be careful not to burn yourself during removal/installation of each component.
•  Fuel vapor is hazardous. It can very easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
•  Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the “Fuel Line Safety Procedure”. (See BEFORE SERVICE PRECAUTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
Note
•  For the general (R.H.D.) specification, engine compression ratios of 13 and 14 are included and the specified value of each compression pressure differs. The compression ratio can be identified by the part number of the piston set, therefore, verify the part number of the piston set using the following procedure:
1.  Input the vehicle identification number (VIN) into the “Mazda Electronic Parts Catalog”.
2.  Record the part number of the piston set.
SKYACTIV-G 1.5
―  P5Y2-11SA0 (Compression ratio of 13)
―  P5Y1-11SA0 (Compression ratio of 14)
SKYACTIV-G 2.0
―  PEY2-11SA0 (Compression ratio of 13)
―  PEY3-11SA0 (Compression ratio of 14)

1.  Verify that the battery is fully charged. (See BATTERY INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  Recharge it if necessary. (See BATTERY RECHARGING [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

2.  Connect the M-MDS to the DLC-2.

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

4.  Display the following PIDs using the M-MDS data monitor function. (See PCM INSPECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

•  RPM (engine speed)

5.  Perform “Fuel Line Safety Procedures”. (See BEFORE SERVICE PRECAUTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)

6.  Remove the following parts.

(1)  Plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(2)  Ignition coil/ion sensors. (See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(3)  Spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(4)  Fuel pump relay
(5)  Fuel injector relay

7.  Measure the compression pressure using the following procedure.

(1)  Press a compression gauge into the spark plug hole.
am3uuw00008795
(2)  Fully depress the accelerator pedal.
(3)  Crank the engine and measure the following values simultaneously.
•  Compression pressure
•  Engine speed
Note
•  Because the SKYACTIV-G retards the intake valve closing timing, compression pressure is low.

Compression pressure [European (L.H.D. U.K.) specs.] (SKYACTIV-G 1.5)

am3zzw00017936
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 146 kPa {1.49 kgf/cm2, 21.2 psi}[250 rpm]

Compression pressure [European (L.H.D. U.K.) specs.] (SKYACTIV-G 2.0)

am3zzw00017937
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 164 kPa {1.67 kgf/cm2, 23.8 psi}[250 rpm]

Compression pressure [Australian specs.] (SKYACTIV-G 2.0)

am3zzw00017938
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 148 kPa {1.51 kgf/cm2, 21.5 psi}[250 rpm]

Compression pressure (SKYACTIV-G 2.5)

am3zzw00017939
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 160 kPa {1.63 kgf/cm2, 23.2 psi}[250 rpm]

Compression pressure [General (L.H.D.) specs.] (SKYACTIV-G 1.5)

am3zzw00017940
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 131 kPa {1.34 kgf/cm2, 19.0 psi}[250 rpm]

Compression pressure [General (L.H.D.) specs.] (SKYACTIV-G 2.0)

am3zzw00017938
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 148 kPa {1.51 kgf/cm2, 21.5 psi}[250 rpm]

Compression pressure [Israel] (SKYACTIV-G 1.5)

am3zzw00017936
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 146 kPa {1.49 kgf/cm2, 21.2 psi}[250 rpm]

Compression pressure [Israel] (SKYACTIV-G 2.0)

am3zzw00017937
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 164 kPa {1.67 kgf/cm2, 23.8 psi}[250 rpm]

Compression pressure [General (R.H.D.) specs.] (SKYACTIV-G 1.5 (Compression ratio of 13))

am3zzw00017940
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 131 kPa {1.34 kgf/cm2, 19.0 psi}[250 rpm]

Compression pressure [General (R.H.D.) specs.] (SKYACTIV-G 1.5 (Compression ratio of 14))

am3zzw00017936
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 146 kPa {1.49 kgf/cm2, 21.2 psi}[250 rpm]

Compression pressure [General (R.H.D.) specs.] (SKYACTIV-G 2.0 (Compression ratio of 13))

am3zzw00017938
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 148 kPa {1.51 kgf/cm2, 21.5 psi}[250 rpm]

Compression pressure [General (R.H.D.) specs.] (SKYACTIV-G 2.0 (Compression ratio of 14))

am3zzw00017937
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 164 kPa {1.67 kgf/cm2, 23.8 psi}[250 rpm]

Compression pressure [Thailand] (SKYACTIV-G 2.0)

am3zzw00017937
Standard: Refer to the graph.
Minimum: Refer to the graph.
Maximum difference between cylinders: 164 kPa {1.67 kgf/cm2, 23.8 psi}[250 rpm]
(4)  Perform Steps (1) to (3) for all cylinders.
(5)   If the measured value is the threshold or less, or if there is a cylinder which exceeds the specified maximum difference between cylinders, add a small amount of engine oil through the spark plug hole and perform Steps (1) to (3).
•  If the pressure increases by adding the engine oil, the piston ring or the cylinder surface is worn, or they are damaged. Perform overhaul servicing.
•  If the pressure does not increase, valve seizure, valve attachment malfunction, or pressure leakage from the cylinder head gasket might be occurring. Perform overhaul servicing.
(6)  If the measured value is high, it is possible that there is an error in the electric variable valve timing system.

8.  Remove the compression gauge.

9.  Install the following parts.

(1)  Fuel injector relay
(2)  Fuel pump relay
(3)  Spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(4)  Ignition coil/ion sensors. (See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)
(5)  Plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].)