Toyota 4A-FE Repair Manual page 199

IG-4
4A-FE
IGNITION SYSTEM - Ignition System Circuit
IGNITION SYSTEM CIRCUIT
ELECTRONIC SPARK ADVANCE (ESA)
The ECU is programmed with data for optimum ignition timing
under any and all operating conditions. Using data provided by
sensors which monitor various engine functions (rpm, intake air
volume, eng. temperature, etc.) the microcomputer (ECU) trig-
gers the spark at precisely the right instant.
Ignition Switch
AM2
FL
AM2
30A
FL
MAIN
2 .0L
Battery[]
1
Spark Plug : Cap and Rotor
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~~~~~
-s-
Firing Order:
1-3-4-2
To Tachometer
Pickup
Coil
Signal Rotor
<>
0
G
f' . -2l
G1 NE
ECU
Ignition
Coil
Igniter
IGT IGF
\G1309