1996 TOYOTA T100 diagram

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 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

Downloaded from www.Manualslib.com manuals search engine P19917
From
IG Switch
Mass Air Flow MeterBattery
R/B No.2
J/B No.1B−W
W−R
B−YEFI
IGN
EFI RelayW−R
B−Y
W−B
EA1EA1
IE1
W−R W−R
1A1C
EA
1
2
222
2
12
2
2 3 2
4
17
31
2
52
E6 E6
E6 E68
818
GR−R
BR−W
(M/T)(A/T)
VG
E3
E1
W
9
9ECM
DI−150
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value of mass
air flow rate.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand−held tester main switch
ON.
(c) Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or TOYOTA hand−held tester.
RESULT:
Type IType II
Mass air flow rata (gm/sec.)Approx. 011.0 − 25.1 (idling after warming up)
Type I Go to step 2.
Type II Go to step 5.

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ECM
Intake Air Temp. Sensor
(Built into mass air flow meter)
3
4Y−G
BR−BE6
E6 E6E65 V
THA
E2 12 14
922
(M/T)(A/T)R
E1
− DIAGNOSTICSENGINE (5VZ−FE)
DI−155
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (Sensor Ground) may be open.
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value of
intake air temp.
PREPARATION:
(a) Connector the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand−held tester main switch
ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA hand−held tester.
OK:
Same as actual intake air temp.
HINT:
If there is open circuit, OBD II scan tool or TOYOTA hand−held tester indicates − 40°C ( 40°F).
If there is short circuit, OBD II scan tool or TOYOTA hand−held tester indicates 140°C (284°F) or more.
NG − 40°C (− 40°F) ... Go to step 2.
140°C (284°F) or more ... Go to step 4.
OK
Check for intermittent problems
(See page DI−129).

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ECM
5 V
THW
E2 Engine Coolant Temp. Sensor
2
12
1 G−YG−Y
BR−BBR−B420
922
E1
(M/T)(A/T)E6E6
EC2
E6E6 EC2 DI−158
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0115 Engine Coolant Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
A thermistor built into the engine coolant temp. sensor changes the resistance value according to the engine
coolant temp.
The structure of the sensor and connection to the ECM is the same as in the intake air temp. circuit malfunc-
tion shown on page DI−154.
If the ECM detects the DTC P0115, it operates the fail safe function in which the engine coolant temp. is
assumed to be 80°C (176°F).
DTC No.Detection ItemTrouble Area
P0115Open or short in engine coolant temp. sensor circuit
Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM
HINT:
After confirming DTC P0115 use the OBD II scan tool or TOYOTA hand−held tester to confirm the engine
coolant temp. from ”CURRENT DATA”.
Temp. DisplayedMalfunction
− 40°C (− 40°F)Open circuit
140°C (284°F) or moreShort circuit
WIRING DIAGRAM
DI0UJ−01

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ECM
5 V
VCC
VTA
E2 2
3
1 Throttle Position Sensor
E6E6
E6E6
E6
E6 1
10
91
7
22 G−B
Y−B
BR−B
(M/T) (A/T) DI−164
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM