Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 37

ELECTRONIC CONTROL SYSTEM - G and NE Signal Generators
NE SIGNAL
F* 1
ELECTRICAL CIRCUITRY, AND G AND NE
SIGNAL WAVEFORMS
The NE signal is used by the Engine ECU to
detect the engine speed . The Engine EC U
determines the basic injection duration and basic G1 signal
(1 pickup coil, 1 tooth)
ignition advance angle by these signals . NE G2 signal (1 pickup coil, 1 tooth)
signals are generated in the NE pickup coil by
NE signal ( 1 pickup coil, 12 teeth )
the NE signal plate like the G signals . The only
difference is that the signal plate for the NE
signal has 12 teeth instead of just one .
Therefore, 12 NE signals are generated per each
engine revolution .
From these signals, the Engine ECU detects the
engine speed as well as each 30° change in the
crankshaft angle .
Engine ECU
OHP 2 3
NE pickup coil
rfimmimlii~
OHP 2 2
One rotation of NE signal plat e
NE signal
h I
1
~r~rrur~ r
i ~ - 30° CA
irr
OHP 22
F
G1 signa l
G2 signa l
NE signal
1800
CA
7200
CA
J
OHP 23
29