Toyota COMPUTER-CONTROLLED SYSTEM

ELECTRONIC CONTROL SYSTEM
- G and NE Signal Generator s
NE SIGNA L
The NE signal is used by the Engine ECU to
detect the engine speed
. NE signals are
generated in the pickup coil by the timing rotor
in the same way as with the G signal
. The only
difference is that the timing rotor for the NE
signal has 24 teeth
. It activates the NE pickup
coil 24 times per each revolution of the
distributor shaft, generating the waveforms
shown in the chart
. From these signals, the
Engine ECU detects the engine speed as well as
each 30° change in the engine crankshaft angle
.
NE signal
timing roto r
OHP 1
6
NE signal
1/2 turn of timing rotor
ELECTRICAL CIRCUITRY, AND G AND NE
SIGNAL WAVEFORM S
1 G signal (1 pickup coil, 4 teeth)
NE signal
(
1 pickup coil, 24 teeth )
Engine EC U
NE signal
OHP 17
1800 CA
OHP 1 7
(2) G signal ( 1 pickup coil, 2 teeth)
NE signal ( 1 pickup coil, 24 teeth
)
Engine ECU
OHP 1 7
U U rrur 1 r
30° CA
rrr
OHP 16
G signa l
NE signal
180° CA
OHP 17
25