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Electronic control system
VCT control
Based on signals input from the sensors, the engine ECM sets the timing to open the intake valve. The
OCV operates according to the engine’s operating condition and the VCT assembly advances the an-
gle, retards the angle, or keeps the current position to control the timing to open the intake valve.
Knock control
The engine ECM receives signals from the knock sensor installed between the cylinder banks. The ig-
nition timing is retarded and engine speed is reduced according to the amount of knocking, to protect
the engine from damage. If knocking occurs frequently, the ignition timing is retarded until knocking is
no longer detected, and then, the learning function maintains that ignition timing.
9. Engine
ECM
10. OCV (PORT)
11. OCV (STBD)
1. Pulser coil
6. LPS
8. Engine temperature sensor
5. TPS
2. Cam position sensor (PORT EX)
3. Cam position sensor (PORT IN)
4. Cam position sensor (STBD IN)
7. 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. Intake air pressure/temperature sensor
8. Engine temperature sensor
9. Engine ECM
10. OCV (PORT)
11. OCV (STBD)
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