Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 38

ELECTRONIC CONTROL SYSTEM - G and NE Signal Generator s
© G signal (1 pickup coil, 1 tooth )
NE signal (1 pickup coil, 36 minus 2 teeth )
Engine EC U
e~N
(NE
This type of NE signal is able to detect both
engine speed and crankshaft angle at the portion
of two teeth missing . It is unable, however, to
distinguish between the TDC of the compression
stroke and that of the exhaust stroke . The G
signal is used for this purpose .
,,--
REFERENC E
4A-FE engine which applies the Engine ECU
made by Bosch uses G signal generator of the
hall element type .
Holl element will generate electromotive force
in proportion to the changes of the magnetic
flux .
I
G signa l
NE signal
YYVV W Y
720°C A
360°C A
V
_I
L
--
I L
10°CA 30°CA
7
VVVYYVYYVVYVVY YtlYYVVVYYVYYYVVVYVYYYVYVYVYtlYYYY YVVVVYtlVVYVVY
/
NOTE
The G signal timing rotor of the above described type in Z) is integrated into a single unit with the cam-
shaft, while the NE signal timing rotor is integrated into a single unit with the crankshaft timing pulley .
Also, the G signal generator is located in the distributor depending on the engine models .
Camshaft
A~B
R A A ~ a 0 ~ I
G pickup coi l
Cylinder head
NE signal timing rotor