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FUEL INJECTION SYSTEM
[M604] 2-7
ECU determines the ignition timing based on the signal
compression top dead center based on the signal from
from crank angle sensor 1, and sends the signal for
crank angle sensor 2 and cam angle sensor,
igniter so as to spark the cylinder which is judged at
BTDC
100°
40°
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Zone 1
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Zone 2 '
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Zone 3
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C2-176
Fig . 30
When engine speed is low, the ECU sends out the
ignition signal in synchronization with the 10 deg signal .
Zone. 1 : Judge engine speed with angular velocity.
Zone. 2: Dowel-set with 70° signal .
Zone. 3: Ignition timing determined by ECU.
Zone. 4: Actual ignition timing .
19
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Troubleshooting
