1996 TOYOTA T100 check engine

Downloaded from www.Manualslib.com manuals search engine BE6653
P24212
P24213
A00088
START
IGT (+) For M/T
For A/T
IGT (+)
FI6680
IGT
IGF
0 V 0 V
10 msec./Division (Iding) IGT signal waveform
2 V/
Division
DI−106
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
5 Check voltage between terminals IGT of ECM connector and body ground.
PREPARATION:
Remove the right cowl side trim (See page MF−50).
CHECK:
Measure voltage between terminals IGT 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 cranking or idling, check waveform between terminals
IGT 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
P24212
P24213
A00088
START
IGT (+) For M/T
For A/T
IGT (+)
BE6653
P24215
A00089
ON
START
3 (+)
− DIAGNOSTICSENGINE (3RZ−FE)
DI−107
1996 TOYOTA T100 (RM449U)
6 Disconnect igniter connector and check voltage between terminals IGT of ECM
connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
Measure voltage between terminals IGT of ECM connector and
body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN−26).
OK
7 Check voltage between terminal 3 of igniter connector and body ground.
PREPARATION:
Disconnect the igniter connector.
CHECK:
When the ignition switch is turned to ”ON” and ”STA” position,
measure voltage between terminal 3 of igniter connector and
body ground.
OK:
Voltage: 9 − 14 V
NG Check and repair igniter power source circuit.
OK

Downloaded from www.Manualslib.com manuals search engine DI−108
− DIAGNOSTICSENGINE (3RZ−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.

Downloaded from www.Manualslib.com manuals search engine P19741
ECM
STA
E1 E4
(M/T) (A/T)
11
E4 11
B−R
Starter IE1
B−R
B−RB−R B−R (M/T)
21 35
Starter
Relay 1
2
W−B (A/T)
IC
B (A/T) W
Park/Neutral
Position Switch
15
B
5
6 B−Y 22
IA3
AM1
W
ALT
BatteryR/B No. 2W−B (M/T)
Clutch
Start
SwtichIE1
B (M/T) B−Y
6 3 W
W
W
14IE1
2
2
2
2
W
DI−11 0
− DIAGNOSTICSENGINE (3RZ−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 vaporazation is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery voltage is ap-
plied 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 swtich or starter relay circuit
ECM
HINT:
In this circuit, diagnosis can only be made in the check mode.
WIRING DIAGRAM
DI984−01

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−111
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
HINT:
This inspection procedure 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−21.
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 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−21)
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN−26).
NG Repair or replace harness and sconnector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine AB0117
P24216
P24217
A00090
LOCK
BATT (+)
BATT (+) For M/T
For A/T
FI7107
EFI Fuse
R/B No.2
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 3
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 MF−50).
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 No2.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to EFI fuse.
OK
Check and repair harness or connector be-
tween battery, EFI fuse and ECM.

Downloaded from www.Manualslib.com manuals search engine BE6653
P24220
P24221
A00092
ON
E1 (−) +B (+)
E1 (−) +B (+) For M/T
For A/T
DI−11 6
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check voltage between terminals + B and E1 of ECM connector.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals + B and E1 of ECM con-
nector.
OK:
Voltage: 9 − 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−21).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN−26).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page MF−40).
NG Replace EFI main relay.
OK

Downloaded from www.Manualslib.com manuals search engine FI7106
IGN Fuse
J/B No.1
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 7
1996 TOYOTA T100 (RM449U)
4 Check EFI fuse (See page DI−11 4, step 2).
NG Check for short in all harness and components
connected to EFI fuse.
OK
5 Check for open in harness and connector between EFI main relay (Marking: EFI)
and battery, EFI main relay (Marking: EFI) and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
6 Check IGN fuse.
PREPARATION:
Remove the IGN fuse from the J/B No.1.
CHECK:
Check continuity of IGN fuse.
OK:
Continuity
NG Check for short in all the harness and compo-
nents connected to IGN fuse.
OK
7 Check ignition switch (See page BE−12).
NG Replace ignition switch.
OK
Check for open in harness and connector be-
tween IG switch and EFI main relay, EFI main
relay and body ground (See page IN−26).