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FI
SYSTEM
DIAGNOSIS
4-11
INJECTION TIMING
The system employs a sequential, four-cylinder independent injection type, using the crankshaft position
sensor (signal generator) to determine the piston position (injection timing and ignition timing) and the cam-
shaft position sensor to identify the cylinder during operation, and these information are sent to the ECM.
This makes it possible to inject the optimum volume of fuel in the best timing for the engine operating condi-
tions.
When the crankshaft begins to turn at the time of starting, the ECM sends the signals to the four injectors,
#1, #2, #3 and #4 to have them inject fuel simultaneously. From the second turn onward, the sequential
four-cylinder independent injection occurs as explained above.
N
P
5 TURNS
I
4
I
3
I
I
2
I
I
f\f\f\f\f\ftf\f
f\f\f\f\f\f\/\~
f\f\f\f\I\I\I\~
f\f\I\I\I\f\f\f
f\f\f\I\I\f\f\f
ft
f\
~VVVVVVV
VVVVVVV
~VVVVVVV
~VVVVVVV
~VVVVVVV
II V V
EXPAN
EX
IN
COMP
EXPAN
EX IN
COMP
EXPAN
EX
IN
COMP
EXPAN
EX
IN
COMP
EXPAN
EX
IN
COMP
EXPAN
EX
EX
IN
COMP
EXPAN EX
IN
COMP
EXPAN
EX
IN
COM
IN
COMP
EXPAN EX IN
COMP
EXPAN
EX
IN
COMP
EXPA
~
;
c.t
1
c.t
~
c.t
~
G~
G~
G~
G~
f\
f\
V
V
V
~
Starting
I
~
I
~
I
~
~
I
~
r
0
0
180
0
360
0
720
0
#4
#3
#1 cy.
#2 cy.
#3 cy.
#4 cy.
#1
Crank
angle
#2
Injector
Ignition
timing
I
Turning 0
I
T.D.C
(#1)
CMP
sensor
signal
CKP
sensor
signal