1996 TOYOTA T100 engine

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Magnet
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−305
1996 TOYOTA T100 (RM449U)
2 Check No.2 vehicle speed sensor.
PREPARATION:
Remove the No.2 vehicle speed sensor from the transmission.
CHECK:
Check that there is continuity between terminals of No.2 vehicle
speed sensor connector when a magnet is put close to it as
shown.
OK:
Resistance: Changes between 0 Ω and ∞ Ω
NG Replace No.2 vehicle speed sensor.
OK
Check and repair harness and connector between ECM and No.2 vehicle speed sensor
(See page IN−26). Check and repair sensor rotor.

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ECM Combination Meter
Park/Neutral
Position Switch
Dio
Diode
Ignition Switch
Integration
Relay J/B No.1
Starter
Relay
R/B No.2 R/B No.2
Battery
GAUGECIG
ACC
IG1
NSW
AM1ALTB+ E4
E4
E4L
2
R R2L
15
16
17
E4 E7 26
5C12 C12 C12
P1
P1P1
P1
P1
P1
IE2
IE2
IE2 IE2
IE1
IA3
1A 1AIE1
R−B P−G
V−W
R−W P−G V−W
R−B
P−GV−W
B−O
B−Y
B−O
B−Y B−Y
B−O B−O GR−R
B−O
WW WW W
BB
W−B L−R
B−Y
B−O B−Y
B−O B−Y
33
2
6
8
616 17
154
5 3
12
2
2 6
5
22 21
3
2 4
2
11
9
1 2
14AM1 ST1
*1
3
2
1
*1
*1*2
*2
*2 *1
*1 *1*2
*2
*2
*1
*2 *1
*2
IC
*1
*2
22
3RZ−FE
5VZ−FE
*1
*2
14 22 DI−306
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
DTC P1780 Park/Neutral Position Switch Malfunction
CIRCUIT DESCRIPTION
The park/neutral position switch detects the shift lever position and sends signals to the ECM.
The ECM receives signals (NSW, R, 2 and L) from the park/neutral position switch. When the signal is not
sent to the ECM from the park/neutral position switch, the ECM judges that the shift lever is in D position.
DTC No.DTC Detection ConditionTrouble Area
P1780
2 or more switches are ON simultaneously for R, N, 2 and L
positions
(2 trip detection logic)
Short in park/neutral position switch circuit
Park/neutral position switch
ECMWhen driving under conditions (a), (b) and (c) for 30 seconds
or more, 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
(c) Engine load: 0.6 g/rev
WIRING DIAGRAM
DI0W5−02

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Q08479
Q08480
D00013
ON
L
2 R NSW (+)
(−)
(+)
(−)NSWR
2 L 3RZ−FE
5VZ−FE
Position
P, N
R
D
2
LNSW−Body
groundR−Body
ground2−Body
groundL−Body
ground
0 V
0 V0 V0 V
0 V
0 V
0 V 0 V
0 V
0 V 0 V
0 V
0 V 7.5 ∼ 14 V*
7.5 ∼ 14 V7.5 ∼ 14 V*
7.5 ∼ 14 V*
7.5 ∼ 14 V* 7.5 ∼ 14 V
7.5 ∼ 14 V
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−307
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using TOYOTA hand−held tester:
PREPARATION:
(a) Connect a TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand−held tes-
ter main switch ON.
CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2ND and LOW signals on the TOYOTA hand−held
tester.
OK:
Shift positionSignal
22ND OFF → ON
LLOW OFF → ON
RREVERSE OFF → ON
P, NPNP OFF → ON
When not using TOYOTA hand−held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminals NSW, 2, L and R of ECM
and body ground when the shift lever is shifted to the following
positions.
OK:
*: The voltage will drop slightly due to lighting up of the back up
light.
OK Check and replace ECM.
NG

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DI−308
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
2 Check park/neutral position switch.
PREPARATION:
(a) Jack up the vehicle.
(b) Disconnect the park/neutral position switch connector.
CHECK:
Check continuity between each terminal shown below when the
shift lever is moved to each position.
OK:
Shift PositionTerminal No. to continuityTerminal No. to continuity
P4 − 75 − 6
R4 − 8−
N4 − 105 − 6
D4 − 9−
22 − 4−
L3 − 4−
NG Replace park/neutral position switch.
OK
Repair or replace harness and connector between battery and park/neutral position switch,
park/neutral position switch and ECM (See page IN−26).

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Cruise Control Actuator with ECU ECM
B+
OD1
E47
Y−R
C17
9
OD
D00053
ON
OD1 (−)
(+)
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−309
1996 TOYOTA T100 (RM449U)
O/D Cancel Signal Circuit (5VZ−FE only)
CIRCUIT DESCRIPTION
While driving uphill with cruise control activated, in order to minimize gear shifting and provide smooth cruis-
ing overdrive may be prohibited temporarily under some condition.
The cruise control ECU sends O/D cut signals to the ECM as necessary and the ECM cancels O/D shifting
until these signals are discontinued.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminal OD1 of ECM and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure voltage between terminal OD1 of ECM and body
ground.
OK:
Voltage: 4 − 6 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−282).
NG
DI0W9−02

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DI−310
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
2 Check voltage between terminal OD of cruise control ECU harness side
connector and body ground.
PREPARATION:
(a) Disconnect the cruise control ECU connector.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal OD of cruise control ECU
harness side connector and body ground.
OK:
Voltage: 4 − 6 V
OK Check and replace cruise control ECU.
NG
3 Check harness and connector between cruise control ECU and ECM
(See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

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*O/D Main Switch
Contacts go open with switch pushed in.
Contacts go closed with switch pushed once again.
*1: 3RZ−FE
*2: 5VZ−FEO/D OFF Indicator Light
(Combination Meter)
Integration
Relay Ignition Switch
R/B No.2 R/B No.2J/B No.1ECM
GAUGE
Battery AM1
IG1
ALT AM1B+
OD2 B−YB−OY−G
W W
WW 65
2222
2 1 199 2
3
1A
141
2O3
O3E4
C13 C12
IA3
875
6
Y−G
W−B
IC
*1
*2
*
O/D
Main
Switch
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−311
1996 TOYOTA T100 (RM449U)
O/D Main Switch & O/D OFF Indicator Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go open when the switch is pushed in and go closed when it is pushed out.
In O/D main switch at OFF position, the O/D OFF indicator light lights up, and the ECM prohibits shifting O/D.
WIRING DIAGRAM
DI0WD−02

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ON
O/D Main Switch
ON
OFFOFF
ON
DI−312
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
O/D OFF indicator light does not light up:
1 Check operation of O/D main switch.
PREPARATION:
Turn the ignition switch ON.
CHECK:
(a) Check the O/D OFF indicator light when O/D main switch
is pushed in to ON.
(b) Check the O/D OFF indicator light when O/D main switch
is pushed again to OFF.
OK:
(a) O/D OFF indicator light goes off
(b) O/D OFF indicator light lights up
NG Go to step 4.
OK