• 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 lead-acid battery is in a completely charged condition. (SeeBATTERY INSPECTION)
2.Connect the M-MDS to the DLC-2.
3.Warm up the engine.
4.Display the following PID using the M-MDS data monitor function. (Refer to [PID/DATA MONITOR INSPECTION] in the troubleshooting manual) (Refer to [PID/DATA MONITOR TABLE [PCM]] in the troubleshooting manual)
(3)Spark plug (See SPARK PLUG REMOVAL/INSTALLATION [PYUL].)
7.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
Cranking method is as follows.
• Cranking begins when the main power is switched ON (READY on) while the brake pedal is depressed.
• If the main power is switched OFF during cranking, cranking stops.
(3)Crank the engine and measure the following values simultaneously.
• Compression pressure
• Engine speed
Compression pressure
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1
Compression pressure value (kPa{kgf/cm2, psi})
2
Engine speed (rpm)
3
Standard
4
Minimum specification
Standard: Refer to graph
Minimum: Refer to graph
Difference between cylinders: Within 116 kPa{1.18 kgf/cm2, 16.8 psi} [250 rpm]
(4)Perform Steps (1) to (3) for all cylinders.
(5)If a measurement is less than the minimum specification, or there is a cylinder which exceeds the specified difference between cylinders, add a small quantity 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 failure, or pressure leakage from the cylinder head gasket might be occurring. Perform overhaul servicing.
(6)If the measured value is high, a malfunction in the electric variable valve timing system can be considered.
8.Remove the compression gauge.
9.Install the following parts.
(1)Spark plug (See SPARK PLUG REMOVAL/INSTALLATION [PYUL].)
