IGNITION TIMING CHECK


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

2.Turn OFF the power supply mode of the electric motor switch and then connect the M.U.T.-III to the diagnosis connector.

3.Set a timing light to the power supply line (terminal No. 3) of the ignition coil No. 4.
note The power supply line is looped and also longer than the other ones.
4.Select BMU data list item No. 1 on the M.U.T.-III to measure Charge state (control). If the charge state (control) is less than 30 %, charge so that the charge state (control) can become 30 % or more.
5.Set the vehicle to the continuous idling mode.
6.Select engine actuator test item No. 11 on the M.U.T.-III, and set the ignition timing to the basic ignition timing.
7.Check that basic ignition timing is within the standard value.
Standard value: 5° BTDC ± 3°
8.If the basic ignition timing is outside the standard value, inspect the MPI system (Refer to GROUP 13E - Troubleshooting - Inspection Chart for Trouble Symptoms ).
9.
caution If the test is not cancelled, a forced driving will continue for 27 minutes. Driving under this condition may damage the engine.
Cancel the engine actuator test item No. 11, Basic ignition timing set mode, on the M.U.T.-III.
10.Check that ignition timing is at the standard value.
Standard value: approximately 28° BTDC
note
  • The ignition timing may fluctuate within ± 7°. This is normal.
  • In higher altitude, the ignition timing is more advanced than the standard value by approximately 5°.
  • Wait till approximately 1 minute passes after the engine started, and check the ignition timing when the engine stabilized.
11.Remove the timing light.
12.Turn OFF the power supply mode of the electric motor switch and then disconnect the M.U.T.-III.