2. Turn off the ignition and connect the tester to the 16-pin diagnostic connector under the instrument panel.
3. Install the stroboscope.
Note: For a GDI engine, connect a stroboscope to the ignition coil supply line of cylinder #1 (conclusion "1").
GDI engine.
4. Start the engine and let it idle.
5. Check that the idle speed corresponds to the nominal value (see section "Checking the idle speed").
6. Select settings on the tester (sub-item No. 17 of Actuator test item for MUT-II), corresponding to the setting of the basic ignition timing.
Note: For a GDI engine, at this point, the engine speed will become 700 rpm (4G15) or 750 rpm (4G93).
7. Check the value of the basic ignition timing, which must be within the specified limits.
Nominal value... 5 + 3°to TDC 8. If the basic ignition timing does not correspond to the nominal value, then perform troubleshooting and check the components of the fuel injection system (see relevant chapter).
9. Press the reset button on the tester (button "Clear" for MUT II), to disable the base lead mode (Actuator Test mode for MUT-II). Attention: if this is not done, then the forced control mode of the device will be saved for 27 minutes. Driving under these conditions can damage the engine.
10. Check up that an angle of an advancing of ignition, corresponds to nominal value.
Rated value: (approximately)
- GDI engine - 20°to TDC
- 4G15-MPI engine - 10°to TDC
- 4G93-MPI engine - 8°BTDC
Note:
- Even during normal engine operation, the ignition timing changes within±7°.
- As the altitude increases, the ignition timing automatically increases by about 5°from the nominal value.
- For a GDI engine, 4 minutes or more after the base advance mode is turned off, the ignition advance will be approximately 5°BTDC.
11. Disconnect the stroboscope.
12. Turn off the ignition and disconnect the tester.