1996 TOYOTA T100 relay

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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).

Downloaded from www.Manualslib.com manuals search engine A00650
EFI Relay
EFI
AM2
AM1
ALT
BatteryIG Switch
IG
STIGN
Park/Neutral
Position Switch
(A/T)
Starter
Relay
Clutch
Start
Switch
(M/T)
StarterCircuit Opening Relay
L2
L1Fuel Pump
ECM
FC
Tr
STA
NE (STA Signal)
(NE Signal) From
Crankshaft
Position
Sensor DI−11 8
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
Fuel Pump Control Circuit
CIRCUIT DESCRIPTION
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 witches 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.
DI0U8−03

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ECM
EFI
AM2
AM1 ALT
BatterySwitch
Park/
Switch
StarterRelay
Clutch
Start
Switch
E01 FC 14 14
E4 E7
(M/T)(A/T) G−Y 16
IE1 G−Y L
1
4
6 Circuit
Opening
BJ1
8
L
W−BW−BBJ1
11
W−BIC IC
2 W−R W−R
W−B
EA19
EA
3
B−WB−W
B−WIE1
21 Starter
Relay
IC
(M/T)
B−W 1
5
23
1
2
B−RW−B
W−B (A/T)
W
B B−W
3
2
2
2 Relay EFI 22
5
1
2 2 2 22 R/B No.2
2
2
2
W
W B−Y
W−R
W
14
8
IA3
IA3
W−R
W
8
EA1
IG
67
1A
1C3
17
IGN
J/B
No.2
B−Y
B−Y (A/T)
(M/T) B
IE1
415
B
5
6
B−YIE1
22Neutral
Position
(A/T)
Fuel
Pump
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 9
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM

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2 (+)
1 (+)
4 (−)
21
34
6
BE6653
P24224
P24225
A00095
ON
FC (+)
FC (+) For M/T
For A/T
− DIAGNOSTICSENGINE (3RZ−FE)
DI−121
1996 TOYOTA T100 (RM449U)
3 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page MF−42).
CHECK:
(a) Apply battery voltage between terminals 2 and 4.
(b) Measure voltage between terminals 1 and 4.
OK:
Terminals 1 and 4Same 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 MF−50).
(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,
circuit opening relay and ECM.
OK

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3 (+)
6 (−)1
2
1 2
34
6
DI−122
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
5 Check fuel pump (See page MF−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.
7 Check circuit opening relay.
PREPARATION:
Remove the circuit opening relay (See page MF−42).
CHECK:
(a) Apply battery voltage between terminals 3 and 6.
(b) Check continuity between terminal 1 and 2.
OK:
Terminals 1 and 2Continuity
NG Replace circuit opening relay.
OK

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START
3
− DIAGNOSTICSENGINE (3RZ−FE)
DI−123
1996 TOYOTA T100 (RM449U)
8 Check voltage between terminal 3 of circuit opening relay connector and body
ground.
CHECK:
Measure voltage between terminal 3 of circuit opening relay
connector and body ground when engine is cranked.
OK:
Voltage: 9 − 14 V
NG Check for starter signal circuit (See page
DI−11 0).
OK
Check for open in harness and connector between terminal 6 of circuit opening relay connector
and body ground (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−125
1996 TOYOTA T100 (RM449U)
3 Check circuit opening relay (See page MF−42).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground (See
page MF−42).
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
circuit opening relay and ECM.
OK
5 Check fuel pump (See page IG−1).
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.

Downloaded from www.Manualslib.com manuals search engine DI−126
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
7 Check circuit opening relay (See page MF−42).
NG Replace circuit opening relay.
OK
8 Check voltage between terminal 3 of circuit opening relay connector and body
ground (See page MF−42).
NG Check for starter signal circuit (See page
DI−11 0).
OK
Check for open in harness and connector be-
tween terminal 6 of circuit opening relay con-
nector and body ground (See page IN−26).