COMPRESSION PRESSURE CHECK


1.Before inspection, set the vehicle to the pre-inspection condition.

2.Pull out the intermediate connector of the glow and injector not to start the engine.


3.Turn the ignition switch to the "LOCK" (OFF) position and then connect the M.U.T.-III to the diagnosis connector.
4.Turn the ignition switch to the ON position.
5.Select "Engine test" of the M.U.T.-III Special Function.
6.Select No.1 "Compression substitute test"
7.Crank the engine within 5 seconds of clicking on the OK button and keep the status for 15 seconds.
note The message, "Test finished", is shown on the MUT-III screen after completing the test.
8.Click the OK button on the dialog box.
9.Check the shown value is within the standard value.
note
  • The test should be repeated 3 times to get statistical based results.
  • The value shows the deviation of engine average speed and the speed of each cylinder while crank the engine.
Standard value: -6 to 6 r/min
10.When the cylinder has the value more than the standard, pour the small amount of engine oil from the installation hole for the glow plug.
(1) If the compression increases after oil is added, the cause of the malfunction is a worn or damaged piston ring and/ or cylinder inner surface.
(2) If the compression does not rise after oil is added, the cause is a burnt or defective valve seat, or pressure is leaking from the gasket.
11.Turn the ignition switch to "LOCK" (OFF) position.
12.Connect the injector connector of all cylinders.
13.Install the glow plugs.
14.Use the M.U.T.-III to erase the diagnosis codes.
note This will erase the diagnosis code resulting from the injector connector being disconnected.