Toyota T100 1996 Service Manual page 499

DTC P1300
CIRCUIT DESCRIPTION
A DIS (Direct Ignition System) has been adopted. The DIS improves the ignition timing accuracy, reduces
high−voltage loss, and enhances the overall reliability of the ignition system by eliminating the distributor.
The DIS is a 2−cylinder simultaneous ignition system which ignites 2 cylinders simultaneously with one igni-
tion coil. In the 2−cylinder simultaneous ignition system, each of the 2 spark plugs is connected to the end
of the secondary winding. High voltage generated in the secondary winding is applied directly to the spark
plugs. The sparks of the 2 spark plugs pass simultaneously from the center electrode to the ground elec-
trode.
The ECM determines ignition timing end outputs the ignition signals (IGT) for each cylinder. Based on IGT
signals, the igniter controls the primary ignition signals (IGC) for all ignition coils. At the same time, the igniter
also sends an ignition confirmation signal (IGF) as a fail−safe measure to the ECM.
DTC No.
No IGF signal to ECM for 6 consecutively IGT signals during
P1300 engine running
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
Igniter Circuit Malfunction
From Battery
G
Camshaft
Position
Sensor
NE
Crankshaft
ECM
Position
Sensor
Various
Sensor
DTC Detecting Condition
− ENGINE (5VZ−FE)
IGT1
IGC1
IGT2
IGC2
IGT3 IGC3
IGF
TAC GND
To Tachometer
S Open or short in IGF or IGT circuit from igniter to ECM
S Igniter
S ECM
Ignition Coil
Spark Plug
No.1 Cylinder
No.4 Cylinder
No.5 Cylinder
No.2 Cylinder
No.3 Cylinder
No.6 Cylinder
Trouble Area
DI−235
DI0V5−01
S00251