Toyota Land Cruiser 1988 Repair Manual page 249

IG-4
Fusible
Link
Battery
0.5G
..,..
I
I
-'--
IGNITION SYSTEM Ignition System Circuit
Ignition Switch
AM1 IG1
Spark Plug
~
Firing Order
1-5-3-6-2-4
IGNITION SYSTEM CIRCUIT
Distributor
G8 NE G
ECU
Ignition Coil
Igniter
'-C>--o-----<:J--1
To Tachometer
IGT IGF
IGOB31
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) triggers the spark at precisely
the right instant.