1996 TOYOTA T100 battery

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W
SwitchIG
W
W W W
Park/Neutral
Position Switch
Clutch Start
Cancel Switch
Clutch
Start
SwitchStarter
Relay
StarterECM
STA
E1 11 1 3
E4 E7
IE1(M/T)(A/T) IE1 IE1
IA3
IA3
EB1
B−W (M/T)
BatteryB−W B−WB−W
B−W
B−W
B−W
W−B (A/T) W−B
(M/T)
B−R
B−R
(M/T)B−R
(M/T)
(M/T)
B−R (M/T) W−B (M/T)B−Y
W
R/B
No.2B (M/T)B
B(A/T)
B−O B−O
(A/T)
IC
IC
21
S1
1 1 13 3 15
2
1
2 12 3
15
26
2 2
ALT AM1
141 3622
5
615
2 2(M/T)
(A/T) (A/T) DI−248
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
Starter Signal Circuit
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.
WIRING DIAGRAM
DI0VA−01

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BatterySwitch IG
W
2 2
2 W−R
12 22
E4 E4
(M/T)(A/T)
ECM
W−R
W−R R−L
B−W B−RB−Y
W−RW−R
BRW−BB−Y
IGN
J/B No.1 1A 1C
317
8
8 7
IA3
EA14
9
4
3
12
R/B No.2EFI AM2
2 22 2
52 3
1 2
EFI
Relay
E7 E5
24 16
E1 +B
EAEB
EA1
− DIAGNOSTICSENGINE (5VZ−FE)
DI−251
1996 TOYOTA T100 (RM449U)
ECM Power Source Circuit
CIRCUIT DESCRIPTION
When the ignition switch is turned ON, battery positive voltage is applied to the coil, closing the contacts of
the EFI main relay (Marking: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI0VB−01

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IGN Fuse
J/B No.1
− DIAGNOSTICSENGINE (5VZ−FE)
DI−253
1996 TOYOTA T100 (RM449U)
4 Check EFI fuse (See page DI−244, step 2).
NG Check for short in all harness and
components connected to EFI fuse.
OK
5 Check for open 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 harness and
components connected to IGN fuse.
OK

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EFI
AM2
AM1
ALT
BatteryIG Switch
IG2
IG1
STIGNEFI Relay
Circuit Opening Relay
Clutch Start
Cancel Switch
(M/T)
L1 L2
ECM Fuel Pump
FC
Tr
STA
NE
Starter
Park/Neutral
Position Switch
(A/T)
Relay Starter
Start Clutch
Switch
(M/T)Crankshaft From
Position
Sensor(STA Signal)
(NE Signal)
− DIAGNOSTICSENGINE (5VZ−FE)
DI−255
1996 TOYOTA T100 (RM449U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
The fuel pump is switched on (low voltage at terminal FC) when STA is on or while the NE signal is input to
the ECM.
In the diagram below, when the engine is cranked, current flows from terminal ST of the ignition switch to
the starter relay coil, the starter relay switches on and current flows to coil L1 of the circuit opening relay.
Thus the circuit opening relay switches on, power is supplied to the fuel pump and the fuel pump operates.
When the STA signal and NE signal are input to the ECM, Tr is turned ON, current flows to coil L2 of the circuit
opening relay, the relay switches on and the fuel pump operates.
While the NE signal is generated (engine running), the ECM keeps Tr ON (circuit opening relay ON) and the
fuel pump also keeps operating.
DI0VC−01

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ECM
EFI AM2 ALT
Battery
IG Switch
Park/
Switch
StarterOpening Relay
Clutch
Start
Switch
E01 FC 4 14
E7 E5
(M/T)(A/T)
G−Y13
IE1 G−YL
1 4
6
Circuit
8
W−B
BJ1
W−B
IC
IC2 W−RW−R
EA19
EA
6
B−WB−R
Relay
(M/T)
3
B−O
WB−W
3
2
22
2 RelayEFI
2 22
51
2
22
2
22 5 R/B
1 2 2
2 3
1 W
W
B−YIA3
IGN
B (M/T)
B
Neutral
Position
(A/T)
Fuel
PumpW−BBJ1 BJ2
BJ2W−B(w/ ABS)
(w/o ABS)
11
(w/ ABS)
(w/o ABS)
10 16
Clutch
Start
Switch
(M/T)Cancel
No.2Starter
J/B No.1
B−R
B−WB−W
B−W B−W
B−W
B−O
B
B−R
W−B
W−RW
B−Y
W 2
2W−B
AM1
23
151 5
1 36 873 17 1113
IC
EB1
S1
EA1IA3
IA31C1A
1
IE1
IE1
B−Y
W−R
W−B
2
2 5 6 4
1
13A/T
DI−256
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM

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2 (+)
1 (+)
4 (−)
1 2
34
6
BE6653
P24225
P24335A00128
ON
For M/T
For A/TFC (+)
FC (+)
DI−258
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page SF−46).
CHECK:
(a) Apply battery voltage between terminals 2 and 4.
(b) Measure voltage between terminals 1 and 4.
OK:
Voltage: Same as battery
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal FC of ECM connector and
body ground.
OK:
Voltage: 9 − 14 V
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
and ECM (See page IN−26).
OK

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1 2
34
6
3 (+)
6 (−)1
2
− DIAGNOSTICSENGINE (5VZ−FE)
DI−259
1996 TOYOTA T100 (RM449U)
5 Check fuel pump (See page SF−5).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, fuel pump and body ground (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).
7 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page SF−46).
CHECK:
(a) Apply battery voltage between terminals 3 and 6.
(b) Check continuity between terminal 1 and 2.
OK:
Continuity
NG Replace circuit opening relay.
OK

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DI−266
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
The diagnosis system operates in normal mode
during normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2 trip detection logic(*) to prevent erroneous detec-
tion. By switching the ECM to check mode when
troubleshooting, the technician can cause the MIL
to light up and for a malfunction that is only detected
once or momentarily (TOYOTA hand−held tester)
(See page DI−265).
*2 trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the ECM memory.
If the same malfunction is detected again during the
2nd test drive, this 2nd detection causes the MIL to
light up.
(b) Inspect the DLC3.
The vehicle’s ECM uses the V.P.W. (Variable Pulse Width)
for communication to comply with SAE J1850. The termi-
nal arrangement of DLC3 complies with SAE J1962 and
matches the V.P.W. format.
Terminal No.Connection / Voltage or ResistanceCondition
2Bus  Line / Pulse generationDuring communication
4Chassis Ground ↔ Body / 1 Ω or lessAlways
5Signal Ground ↔ Body / 1 Ω or lessAlways
16Battery Positive ↔ Body / 9 − 14 VAlways
HINT:
If your display shows ”UNABLE TO CONNECT TO VEHICLE”
when you have connected the cable of OBD II scan tool or TOY-
OTA hand−held tester to DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.
If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.
If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool’s instruction manual.