2. Warm up the engine to normal operating temperature.
3. Turn off the engine.
4. Disconnect the crankshaft position sensor.
5. Remove the fuel pump relay from the engine compartment fuse box.
6. Remove all 4 fuel injectors.
Note.
- When measuring compression in each engine cylinder, all 4 fuel injectors must be removed to obtain reliable results.
- The time it takes to turn the engine crankshaft with the starter should not exceed 10 seconds. The interval between repeated crankings should be at least 30 seconds.
7. Crank the engine crankshaft with the starter for five seconds to remove all foreign material from the cylinders.
8. Before taking the compression tester readings, make sure that the crankshaft rotation speed of the starter exceeds 140 rpm. If the rotation speed is below 140 rpm, check the battery charge level and the reliability of the starter contacts.
9. Install the EN-48248 compression tester into the fuel injector hole of the corresponding cylinder.
10. Rotate the engine with the starter, wait until the compression meter readings stabilize and record the obtained values. In a normal cylinder, the compression value is displayed quickly and evenly up to the set value. If there are malfunctions, the compression value is initially low, then gradually begins to increase, but never reaches the set level (piston ring leaks) or remains at one level without increasing (valve leaks).
11. Disconnect the compression gauge from the fuel injector hole.
12. Repeat the compression measurement procedure for the remaining engine cylinders and record the obtained values.
Note: The normal compression value in the engine cylinder is 2,600 kPa. The difference in compression in different cylinders should not exceed 260 kPa.
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