2-8
Electronic control system
Ignition timing control
In digital ignition control, the engine ECM determines the optimum ignition timing according to the sig-
nals from the sensors and sends the primary current to the ignition coils. In addition, various restrictions
and compensations are made to determine the actual ignition timing. The ignition timing is also con-
trolled according to the knock control.
13. Engine
ECM
14. Ignition coil
1. Pulser coil
9. Engine temperature sensor
5. TPS
11. Engine shut-off switch
12. Battery
10. Knock sensor
6. LPS
7. SPS
2. Cam position sensor (PORT EX)
3. Cam position sensor (PORT IN)
4. Cam position sensor (STBD IN)
8. Intake air pressure/
temperature sensor
1. Pulser coil
2. Cam position sensor (PORT EX)
3. Cam position sensor (PORT IN)
4. Cam position sensor (STBD IN)
5. TPS
6. LPS
7. SPS
8. Intake air pressure/temperature sensor
9. Engine temperature sensor
10. Knock sensor
11. Engine shut-off switch
12. Battery
13. Engine ECM
14. Ignition coil
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