1996 TOYOTA T100 engine

Downloaded from www.Manualslib.com manuals search engine A16046
− DIAGNOSTICSENGINE (5VZ−FE)
DI−233
1996 TOYOTA T100 (RM449U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Remove right cowl side trim.
(b) Connect between terminals IDL and E2 of ECM connec-
tors.
HINT:
Throttle position sensor connector is disconnected. Before
checking, do a visual check and contact pressure check for the
connector.
(c) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand−held tester.
OK:
CTP switch signal: ON
OK Open in harness between ECM and throttle
position sensor, repair or replace harness.
NG
Confirm connection at ECM. If OK, replace
ECM.

Downloaded from www.Manualslib.com manuals search engine A16047
DI−234
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
OBDII scan tool (excluding TOYOTA hand−held tester):
1 Check for open in harness or ECM
PREPARATION:
(a) Disconnect the throttle position sensor connector.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals 3 and 4 of throttle position
sensor connector.
OK:
Voltage: 9 − 14 V
OK Confirm good connection at sensor. If OK, re-
place throttle position sensor.
NG
2 Check for open in harness and connector between throttle position sensor and
ECM (See page IN−26).
NG Open in harness between ECM and throttle
position sensor.
OK
Confirm connection at ECM. If OK, replace
ECM.

Downloaded from www.Manualslib.com manuals search engine S00251
From BatteryIgnition Coil
Spark Plug
IGC1
IGC2
IGC3
GND TA C IGT1
IGT2
IGT3
IGF
To Tachometer ECM G
NE
Camshaft
Position
Sensor
Crankshaft
Position
Sensor
Various
SensorNo.1 Cylinder
No.4 Cylinder
No.5 Cylinder
No.2 Cylinder
No.3 Cylinder
No.6 Cylinder
− DIAGNOSTICSENGINE (5VZ−FE)
DI−235
1996 TOYOTA T100 (RM449U)
DTC P1300 Igniter Circuit Malfunction
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.DTC Detecting ConditionTrouble Area
P1300
No IGF signal to ECM for 6 consecutively IGT signals during
engine runningOpen or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM
DI0V5−01

Downloaded from www.Manualslib.com manuals search engine S00903
Battery W−R
W−R R−L WAM2
2
24
3R/B 8
IA3Switch IG
B−R
IE1
B−L
BR−B
B−W
B−Y
BRInjector
No.1
No.2
No.3
EB
8B−R
714
No.2Spark
PlugB−RB−RECM
Ignition
Coil
B−R
BR−Y
BR−W
B−R
B−R
B−W
2 1
2 1
2 1
10
2
1
3
8 4 5 6 7 9
To
Tachometer
(M/T)(A/T)
E7 E7
E7 E7
E7 E7
E7 E7IGT1 23 24
22 25
21 26
17 12IGT2
IGT3
IGF5 V
DI−236
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check spark plug (See page IG−1).
NG Go to step 4.
OK

Downloaded from www.Manualslib.com manuals search engine BE6653
P24211
P24326A00122
ON
IGF (+)
IGF (+)
For M/T
For A/T
− DIAGNOSTICSENGINE (5VZ−FE)
DI−237
1996 TOYOTA T100 (RM449U)
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN−26).
NG Repair or replace harness or connector.
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove the right cowl side trim (See page SF−61).
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal IGF of ECM connector and
body ground.
OK:
Voltage: 4.5 − 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine BE6653
P24328
P24327A00123
For M/T
For A/TIGT1 (+) IGT2 (+) IGT3 (+)
IGT1 (+) IGT2 (+) IGT3 (+)
START
P20870
IGT1 ∼ 3 and IGF Signal Waveform
VOLT
5
0
5
0
5
0
5
0IGT1
IGT2
IGT3
IGF
20 msec./Division (Idling)
DI−238
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
4 Check for open and short in harness and connector in IGT1 − 3 signal circuit be-
tween ECM and igniter (See page IN−26).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminals IGT1 − 3 of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page SF−61).
CHECK:
Measure voltage between terminal IGT1 − 3 of ECM connector
and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
Reference INSPECTION USING OSCILLOSCOPE
During idling, check waveform between terminals IGT1 − 3, IGF
and E1 of ECM.
HINT:
The correct waveforms are as shown.
NG Check and replace ECM (See page IN−26).
OK

Downloaded from www.Manualslib.com manuals search engine BE6653
P24328
P24327A00123
For M/T
For A/TIGT1 (+) IGT2 (+) IGT3 (+)
IGT1 (+) IGT2 (+) IGT3 (+)
START
BE6653
P24329A00124
ON START
9 (+)
− DIAGNOSTICSENGINE (5VZ−FE)
DI−239
1996 TOYOTA T100 (RM449U)
6 Disconnect igniter connector and check voltage between terminals IGT1 − 3 of
ECM connector and body ground.
PREPARATION:
(a) Disconnect the igniter connector.
(b) Remove the right cowl side trim (See page SF−61).
CHECK:
Measure voltage between terminals IGT1 ∼ 3 of ECM connector
and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 5.0 V
NG Check and replace ECM (See page IN−26).
OK
7 Check voltage between terminal 9 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure voltage between terminal 9 of igniter connector and
body ground, when ignition switch is turned to ”ON” and
”START” position.
OK:
Voltage: 9 − 14 V
NG Check and repair igniter power source circuit.
OK

Downloaded from www.Manualslib.com manuals search engine DI−240
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
8 Check for open and short in harness and connector between ignition switch and
ignition coil, ignition coil and igniter (See page IN−26).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG−1).
NG Replace ignition coil.
OK
Replace igniter.