IGNITION TIMING CHECK


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

2.Turn the ignition switch to the "LOCK" (OFF) position and then connect the M.U.T.-III to the diagnosis connector.

3.Set the timing light to the power supply line (terminal No. 3) of the ignition coil No. 2.
note The power supply line is looped and also longer than the other ones.
4.Start the engine and run it at idle.
5.Check that the idle speed is approximately 600 r/min.
6.Select No. 11 of the M.U.T.-III Actuator test.
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 13C - Troubleshooting - Inspection chart for trouble symptom ).
caution If the test is not cancelled, a forced driving will continue for 27 minutes. Driving under this condition may damage the engine.
9.Cancel the actuator test function item No. 11, Basic ignition timing set mode, on M.U.T.-III.
10.Check that ignition timing is at the standard value.
Standard value: approximately 10° BTDC
note
  • Ignition timing fluctuates about ±7°, even under normal operating condition.
  • It is automatically further advanced by about 5° from 10° BTDC at higher altitudes.
  • 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 the ignition switch to the "LOCK" (OFF) position and then remove the M.U.T.-III.