1996 TOYOTA T100 check engine

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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).

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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

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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

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− 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.

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DI−242
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel injection
volume for the starting injection control and after−start injection control.
DTC No.DTC Detecting ConditionTrouble Area
P1500No starter signal to ECM
Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
DI9AG−01

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DI−243
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI−148.
1 Connect the TOYOTA hand−held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn ignition switch ON and push TOYOTA hand−held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand−held tester while starter operates.
OK:
Ignition Switch PositionONSTART
STA SignalOFFON
OK Proceed to next circuit inspection shown on
matrix chart (See page DI−148).
NG
2 Check for open in harness and connector between ECM and starter relay (See
page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

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P24217
P24330
A00125
LOCK
For M/T
For A/TBATT (+)
BATT (+)
FI7107
EFI Fuse
R/B No.2
− DIAGNOSTICSENGINE (5VZ−FE)
DI−245
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminal BATT of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page SF−61).
CHECK:
Measure voltage between terminal BATT of ECM connector
and body ground.
OK:
Voltage: 9 − 14 V
OK Check and replace ECM (See page IN−26).
NG
2 Check EFI fuse.
PREPARATION:
Remove the EFI fuse from the R/B No.2.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Check for short in all harness and
components connected to EFI fuse.
OK
Check and repair harness or connector
between battery, EFI fuse and ECM.

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− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1605 Knock Control CPU Malfunction
CIRCUIT DESCRIPTION
Refer to Knock Sensor 1, 2 Circuit Malfunction on page DI−188.
DTC No.DTC Detecting ConditionTrouble Area
P1605Engine control computer malfunction (for knock control)ECM
WIRING DIAGRAM
Refer to page DI−188 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P1605) being output?
YES Go to relevant DTC chart.
NO
Check and replace ECM (See page IN−26).
DI9AH−01