1996 TOYOTA T100 engine

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 DI−11 4
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P1780 Park/Neutral Position Switch Malfunction
(A/T Only)
CIRCUIT DESCRIPTION
The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on
terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage
becomes 0 V. When the shift lever is in the D, 2, L, or R position, the park/neutral position switch goes off,
so the voltage of ECM. Terminal NSW becomes battery positive voltage, the voltage of the ECM internal
power source. If the shift lever is moved from the N position to the D position, this signal is used for air−fuel
ratio correction and for idle speed control (estimated control), etc.
DTC No.DTC Detecting ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for ”N”, ”2” and
”L” position
(2 trip detection logic)
Short in park/neutral position switch circuit
Park/neutral position switch
ECMWhen driving under conditions (a) and (b) for 30 sec. or more
the park/neutral position switch is ON (N position):
(2 trip detection logic)
(a) Vehicle speed: 70 km/h (44 mph) or more
(b) Engine speed: 1,500 − 2,500 rpm
HINT:
After confirming DTC P1780 use the TOYOTA hand−held tester to confirm the PNP switch signal from ”CUR-
RENT DATA”.
WIRING DIAGRAM
Refer to DTC P1780 on page DI−11 4.
INSPECTION PROCEDURE
Refer to DTC P1780 on DI−11 4.
DI0U5−02

Downloaded from www.Manualslib.com manuals search engine A00646
J/B No.1EA1
3
7
2IGN 1A
8
2
1
W
Battery
W−R
W−R 4 B−R
1C
17B−Y
IG
SwitchB−Y
IA3
W−R
4
AM2
3
2
R−L
W−R
R/B No.2EFI
22 2 225
B−W221 3
EFI
Relay
W−B
EA EB
EA1
9W−R
(M/T)
IE1
W−R
(M/T)
W−R (A/T)12 12
E4 E4
14 24
E7 E7 BR
(A/T) (M/T)
E1 +B
ECM
8
− DIAGNOSTICSENGINE (3RZ−FE)
DI−11 5
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 (Making: EFI) and supplying power to terminal +B of the ECM.
WIRING DIAGRAM
DI0U7−03

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).

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

Downloaded from www.Manualslib.com manuals search engine A00649
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

Downloaded from www.Manualslib.com manuals search engine A00770
ON
Fuel Return Hose
DI−120
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and check operation of fuel pump.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand−
held tester main switch ON.
(c) Use ”ACTIVE TEST” mode to operate the fuel pump.
CHECK:
Check for fuel pressure in the fuel return hose when it is pinched
off.
OK:
There is pressure in the fuel return hose.
HINT:
At this time, you will hear a fuel flowing noise.
OK Go to step 7.
NG
2 Check for ECM power source circuit (See page DI−11 5).
NG Repair or replace.
OK