relay TOYOTA T100 1996 Factory Repair Manual

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START3
BE6653P24337P24336
A00773A00789
ON
For M/T
For A/TFC (+)
FC (+)
Fuel Inlet Hose
DI−260
− DIAGNOSTICSENGINE (5VZ−FE)
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−248).
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).
OBD II scan tool (excluding TOYOTA hand−held tester):
1 Check operation of fuel pump.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Turn the ignition switch ON.
CHECK:
(a) Connect between terminal FC of ECM connector and
body ground.
(b) Check for fuel pressure in the inlet hose when it is pinched
off.
OK:
There is pressure in the fuel inlet hose.
HINT:
At this time, you will hear a fuel flowing noise.
OK Go to step 7.
NG

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (5VZ−FE)
DI−261
1996 TOYOTA T100 (RM449U)
2 Check for ECM power source circuit (See page DI−251).
NG Repair or replace.
OK
3 Check circuit opening relay (See page DI−255, step 3).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground (See
page DI−255, step 4).
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay
and ECM (See page IN−26).
OK
5 Check fuel pump (See page SF−5).
NG Repair or replace fuel pump.
OK

Downloaded from www.Manualslib.com manuals search engine DI−262
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
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 (See page DI−255, step 7).
NG Replace circuit opening relay.
OK
8 Check voltage between terminal 3 of circuit opening relay connector and body
ground (See page DI−255, step 8).
NG Check for starter signal circuit (See page
DI−248).
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).

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−269
1996 TOYOTA T100 (RM449U)
4. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 − 80°C (122 − 176°F).
(a) D position test
Shift into the D position and fully depress the accelerator pedal and and check the following points:
(1) Check up−shift operation.
1 → 2, 2 → 3 and 3 → O/D up−shift takes place, at the shift point shown in the automatic shift
schedule (See page SS−49).
HINT:
There is no O/D up−shift or lock−up when the coolant temperature is below 60°C (140°F).
Evaluation:
ProblemPossible cause
If there is no 1→2 up−shiftShift solenoid valve No.2 is stuck
1−2 shift valve is stuck
If there is no 2 →3 up−shiftShift solenoid valve No.1 is stuck
2−3 shift valve is stuck
If there is no 3 →O/D up−shift3−4 shift valve is stuck
If the shift point is defectiveThrottle valve, 1−2 shift valve, 2−3 shift valve, etc. are defective
If the lock up is defectiveShift solenoid valve SL is stuck
Lock−up relay valve is stuck
(2) Check for shift shock and slip.
Check for shock and slip at the 1 → 2, 2 → 3 and 3 → O/D up−shifts.
Evaluation:
ProblemPossible cause
If the shock is excessive
Line pressure is too high
Accumulator is defective
Check ball is defective
(3) Check for abnormal noises and vibration.
Run at the D position lock−up or O/D gear and check for abnormal noises and vibration.
HINT:
The check for the cause of abnormal noises and vibration must be done very thoroughly as it could also be
due to loss of balance in the differential torque converter clutch, etc.
(4) Check kick−down operation.
While running in the D position, 2nd, 3rd and O/D gears, check to see that the possible kick−down
vehicle speed limits for 2 → 1, 3 → 2 and O/D → 3 kick−downs conform to those indicated on
the automatic shift schedule (See page SS−49).
(5) Check abnormal shock and slip at kick−down.
(6) Check the lock−up mechanism.
Drive in D position, O/D gear, at a steady speed (lock−up ON).
Lightly depress the accelerator pedal and check that there is lock−up.
If there is a big jump in engine speed, there is no lock−up.
(b) 2 position test
Shift into the 2 position and fully depress the accelerator pedal and check the following points:
(1) Check up−shift operation.
Check to see that the 1 → 2 up−shift takes place and that the shift point conforms to the automatic
shift schedule (See page SS−49).

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−283
1996 TOYOTA T100 (RM449U)
Chapter 2: On−Vehicle Repair Matrix Chart
(: A340E, A340F, A340H AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM391U)
(: A340F, A343F AUTOMATIC TRANSMISSION Repair Manual Pub. No. RM479U)
SymptomSuspect AreaSee page
Vehicle does not move in any forward position and reverse
position
1. Throttle cable
2. No.1 gear shifting rod
3. Manual valve
4. Parking lock pawl
5. Off−vehicle repair matrix chartDI−265
DI−265

AT−17
DI−282
Vehicle does not move in R position1. Off−vehicle repair matrix chartDI−282
Vehicle does not move in particular position or positions
(except R position)1. Off−vehicle repair matrix chartDI−282
No up−shift (1st → 2nd)1. 1−2 shift valve
2. Off−vehicle repair matrix chart
DI−282
No up−shift (2nd → 3rd)1. 2−3 shift valve
2. Off−vehicle repair matrix chart
DI−282
No up−shift (3rd → O/D)1. 3−4 shift valve
2. Off−vehicle repair matrix chart
DI−282
No down−shift (O/D → 3rd)1. 3−4 shift valve
2. Off−vehicle repair matrix chart
DI−282
No down−shift (3rd → 2nd)1. 2−3 shift valve
2. Off−vehicle repair matrix chart
DI−282
No down−shift (2nd → 1st)1. 1−2 shift valve
2. Off−vehicle repair matrix chart
DI−282
No lock−up or No lock−up off1. Lock−up relay valve
2. Off−vehicle repair matrix chart
DI−282
Harsh engagement (N → D)1. Accumulator control valve
2. Off−vehicle repair matrix chart
DI−282
Harsh engagement (Lock−up)1. Lock−up relay valve
2. Off−vehicle repair matrix chart
DI−282
Harsh engagement (N → R)
1. Accumulator control valve
2. C
2 accumulator
3. Off−vehicle repair matrix chart


DI−282
Harsh engagement (N → L)1. Low coast modulator valve
Harsh engagement (2nd → 3rd → O/D)1. Cut−back valve
Harsh engagement (1st → 2nd → 3rd → O/D)1. Throttle valve
2. Actuator control valve

Harsh engagement (2nd → 3rd)
1. Accumulator control valve
2. C
2 accumulator
3. Off−vehicle repair matrix chart


DI−282
Harsh engagement (3rd → O/D)
1. Accumulator control valve
2. B
0 accumulator
3. Off−vehicle repair matrix chart


DI−282
Harsh engagement (O/D → 3rd)
1. Accumulator control valve
2. C
0 accumulator
3. Off−vehicle repair matrix chart


DI−282
Slip or shudder (Forward and reverse)
1. Throttle cable
2. No.1 gear shifitng rod
3. Oil strainer
4. Pressure relief valve
5. Off−vehicle repair matrix chartDI−265
DI−265
AT−12

DI−282

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Transmission
Shift Solenoid
Valve SL
Y
E23
Y−BB+
SL 27 8
E7
E7
*1 *2
*1: 3RZ−FE
*2: 5VZ−FEECM DI−296
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
DTC P0773 Shift Solenoid E Electrical Malfunction
(Shift Solenoid Valve SL)
CIRCUIT DESCRIPTION
The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hydraulic pressure
acting on the lock−up relay valve, which then controls operation of the lock−up clutch.
Fail safe function:
If the ECM detects a malfunction, it turns the shift solenoid valve SL OFF.
DTC No.Detection ItemDTC Detecting ConditionTrouble Area
P0773
Either (a) or (b) are detected for 1 time:
(2 trip detection logic)
(a) Solenoid resistance is 8 Ω or less (short circuit) when sole-
noid is energized
(b) Solenoid resistance is 100 kΩ or more (open circuit) when
solenoid is not energized
Open or short in shift solenoid valve SL circuit
Shift solenoid valve SL
ECM
WIRING DIAGRAM
DI0VU−01

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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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*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

Downloaded from www.Manualslib.com manuals search engine DI0ZQ−03
DI−326
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843−18020, connect terminals Tc and E
1, and remove the short pin.
If a malfunction code is displayed during the DTC check, check the circuit listed that the code. For details
of each code, turn to the page referred to under the ”See Page” for respective ”DTC No.” in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI−332)Open circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
(DI−332)Short circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
13
(DI−335)Open circuit in ABS control (motor) relay circuit
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
(DI−335)Short circuit in ABS control (motor) relay circuit
ABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
21
(DI−338)Open or short circuit in 2−position solenoid circuit for right front
wheelABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
(DI−338)Open or short circuit in 2−position solenoid circuit for left front
wheelABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
(DI−338)Open or short circuit in 2−position solenoid circuit for rear
wheelABS actuator
Open or short in SRR or SRH circuit
ECU
31
(DI−341)Right front wheel speed sensor signal malfunction
Right front, left front, right rear and left rear speed sensor
Open or short in each speed sensor circuit
ECU
32
(DI−341)Left front wheel speed sensor signal malfunction
33
(DI−341)Right rear wheel speed sensor signal malfunction
34
(DI−341)Left rear wheel speed sensor signal malfunction
35
(DI−341)Open circuit in left front or right rear wheel speed sensor.
36
(DI−341)Open circuit in right front or left rear wheel speed sensor.
37
(DI−345)Neither front speed sensor rotor missing
Front axle hub
Right front, left front speed sensor
Wire harness for sensor system
ECU
37
(DI−346)Some tire is different size from the other tiresTire size
ECU
41
(DI−347)Low battery positive voltage or abnormally high battery
positive voltage
Battery
IC regulator
Open or short in power source circuit
ECU

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F14589
ABS Contorl Relay
ABS ActuatorABS ECU
R/B
No.2Motor
Relay
Solenoid
Relay
ABS ECUDLC1
ABS
Battery
A16
A16
A16
A16
A16 A6
A6
A5
A4
A4 A4
A4 A5
A6 A6
A5
A5
A4 EA1
EA1
ID
MR
R−
SR
AST
MT R−B
G−B
R−W
R−Y
R−L W−B
W−B W
W W
W
W
R−L
W−R
LG
4
15
5 4
3
1
3
5 1
2
6
1 5 10
10 2
2
92
25
4
11
8
DI−332
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 TOYOTA T100 (RM449U)
CIRCUIT INSPECTION
DTC 11, 12 ABS Control (Solenoid) Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
11
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. ABS control (solenoid) relay monitor terminal (AST)
voltage: 0V
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage: 0 V
2. ABS control (solenoid) relay monitor terminal (AST)
voltage: Battery positive voltage
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
Fail safe function:
If trouble in the ABS control (solenoid) relay circuit, the ECU cuts off current to the ABS control (solenoid)
relay and prohibits ABS control.
WIRING DIAGRAM