ESA - IGF Signa
l
IGF
(IGNITION
CONFIRMATION) SIGNAL
7
4
The counter-electromotive force that is whether ignition actually occurred or not
.
generated when the primary current is This signal is used for diagnosis (See page 131)
interrupted causes this circuit to send an IGF and the fail-safe function (See page 145)
.
signal to the ECU, which detects by this signa
l
Ignitio
n
coi
l
Ignitio
n
switc
h
Battery
IGF signal
II
generation
circui
t
0
a IGT
-~
2
Ignition
.
. r rnntrn
l
circuit
II h I
I N
~
I- >
OHP 6
1
~ NOT
E
In some recent models, the IGF signal is generated according to the primary current value
. In these
models, IGF is switched on when IGT is on, and IGF is switched off when the primary current exceeds the
predetermined value
.
FOR RECENT MODEL
S
ON
IGT OF
F
Primary
------~
-
current
0
IGF O
N
OFF
IG
F
-
►
FOR PREVIOUS MODEL
S
IGT
ON
OFF ~
I
*
Primary
12 V
voltage
0
ON
IGF
OF
F
* The counter-electromotive forc
e
Igniter
Engine ECU
84
To Next Page
Loading...
