light TOYOTA T100 1996 Factory Workshop Manual

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DI−276
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
If a DTC is displayed during the DTC check, check the circuit listed for that code in the table below and pro-
ceed to the page given.
*:  ... MIL lights up
DTC No.
(See Page)Detection ItemTrouble AreaMIL *Memory
P0500
3RZ−FE:
(DI−92)
5VZ−FE:
(DI−226)
Vehicle Speed Sensor
Malfunction
(No.1 Vehicle Speed Sensor)Open or short in No.1 vehicle speed sensor circuit
No.1 vehicle speed sensor
Combination meter
ECM

P0710
(DI−287)Transmission Fluid Temperature
Sensor Malfunction
(ATF Temperature Sensor)Open or short in ATF temperature sensor circuit
ATF temperature sensor
ECM

P0750
(DI−289)Shift Solenoid A Malfunction
(Shift Solenoid Valve No.1)Shift solenoid valve No.1 is stuck open or closed
Valve body is blocked up or stuck
P0753
(DI−290)Shift Solenoid A Electrical
Malfunction
(Shift Solenoid Valve No.1)Open or short in shift solenoid valve No.1 circuit
Shift solenoid valve No.1
ECM

P0755
(DI−289)Shift Solenoid B Malfunction
(Shift Solenoid Valve No.2)Shift solenoid valve No.2 is stuck open or closed
Valve body is blocked up or stuck
P0758
(DI−290)Shift Solenoid B Electrical
Malfunction
(Shift Solenoid Valve No.2)Open or short in shift solenoid valve No.2 circuit
Shift solenoid valve No.2
ECM

P0770
(DI−294)Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)Shift solenoid valve SL is stuck open or closed
Valve body is blocked up or stuck
Lock−up clutch

P0773
(DI−296)Shift Solenoid E Electrical
Malfunction
(Shift Solenoid Valve SL)Open or short in shift solenoid valve SL circuit
Shift solenoid valve SL
ECM

P1700
(DI−300)Vehicle Speed Sensor No.2
Malfunction
(No.2 Vehicle Speed Sensor)Open or short in No.2 vehicle speed sensor circuit
No.2 vehicle speed sensor
ECM

P1780
(DI−306)Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
Park/neutral position switch
ECM


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No.1 Vehicle Speed Sensor
(In Combination Meter)
O/D Main Switch
Cruise Control ECU
DLC3
Stop Light SwitchECM
DI−278
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)

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DI−282
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check the
circuits for each symptom in the order given in the charts on the following pages and proceed to the page
given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic Circuit Matrix Chart
Chapter 2: On−vehicle Repair Matrix Chart
Chapter 3: Off−vehicle Repair Matrix Chart
If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow
chart for each circuit, proceed to the circuit with the next highest number in the table to continue
the check.
If the trouble still occurs even though there are no abnormalities in any of the other circuits, then
check and replace the ECM.
Chapter 1: Electronic Circuit Matrix Chart
SymptomSuspect AreaSee page
No up−shift
(A particular gear, from 1st to 3rd gear, is not up−shifted)1. ECMDI−279
No up−shift (3rd → O/D)
1. O/D main switch & O/D OFF indicator light circuit
2. O/D cancel signal circuit
3. ECMDI−311
DI−309
DI−279
No down−shift (O/D → 3rd)1. ECMDI−279
No down−shift
(A particular gear, from 1st to 3rd gear, is not up−shifted)1. ECMDI−279
No lock−up1. Stop light swich circuit
2. ECMDI−316
DI−279
No lock−up off1. Stop light swich circuit
2. ECMDI−316
DI−279
Shift point too high or too low1. ECMDI−279
Up−shift to O/D from 3rd while O/D main switch is OFF1. O/D main switch & O/D OFF indicator light circuit
2. ECMDI−311
DI−279
Up−shift to O/D from 3rd while engine is cold1. ECMDI−279
No kick−down1. ECMDI−279
Engine stalls when starting off or stopping1. Stop light swich circuit
2. ECMDI−316
DI−279

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NORMALSHIFT SOLENOID NO.1
MALFUNCTIONING
Solenoid valveNo.1 No.2GearSHIFT SOLENOID NO.2
MALFUNCTIONINGBOTH SOLENOIDS
MALFUNCTIONINGSolenoid valve
No.1 No.2GearSolenoid valve
No.1 No.2GearGear when shift selector is
manually operated
D
2
LON
ONOFF
ON
ON
OFF
OFF OFF
ON
ONOFF
ON
ON OFF
ON
ON ONOFF1st
2nd
3rd
O/D
1st
2nd
3rd
1st
2ndX
X
X
X
X
X
X
X
XON
ON
OFF
OFFON
ON
ON3rd 3rd
O/D
3rd
3rd
1st
2ndX
X
X
X
X
X
X
X
X OFF
OFF
ON
ON OFF OFF
OFF
ON
ON1st
O/D
3rd1st O/D O/D
3rd
1st
1stO/D O/D O/D
O/D
3rd 3rd
3rd
1st
1st
X: MalfunctionsON
ON3rd
3rd
DI−290
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No.1 and
No.2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM con-
trols the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunction, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
HINT:
Check the shift solenoid valve No.1 when DTC P0753 is output and check the shift solenoid valve No.2 when
DTC P0758 is output.
DTC No.DTC Detecting ConditionTrouble Area
P0753
P0758
ECM checks for open or short circuit in shift solenoid valves
No.1 and No.2 circuit when it changes
ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL
After ECM detects condition (a) or (b) continuously 2 times or
more in one−trip, it causes MIL light up until condition (a) or (b)
disappears
After that, if ECM detects condition (a) or (b) once, it starts
lighting up MIL again:
(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 No.1/No.2 circuit
Shift solenoid valve No.1/No.2
ECM
DI0VP−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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*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

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1
2
DI−314
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
3 Check harness and connector between O/D OFF indicator light and ECM (See
page IN−26).
NG Repair or replace harness or connector.
OK
Check O/D main switch.
4 Check O/D main switch.
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
Check continuity resistance between terminal 1 and 2 of O/D
main switch connector.
OK:
O/D main switch conditionSpecified condition
ON (Pushed in)No continuity
OFF (Pushed once agin)Continuity
NG Replace O/D main switch.
OK
Check and replace the combination meter
(See page BE−38).

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1
2
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−315
1996 TOYOTA T100 (RM449U)
O/D OFF indicator light remains ON:
1 Check O/D main switch.
PREPARATION:
Disconnect the O/D main switch connector.
CHECK:
Check continuity between terminals 1 and 2 of O/D main switch
connector.
OK:
O/D main switchSpecified condition
ONNo continuity
OFFContinuity
NG Replace O/D main switch.
OK
2 Check harness and connector between O/D OFF indicator light and O/D main
switch, O/D OFF indicator light and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

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DI−316
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock−up condition, when
brakes are suddenly applied.
When the brake pedal is operated, this switch sends a signals to the ECM. Then the ECM cancels operation
of the lock−up clutch while braking is in progress.
WIRING DIAGRAM
DI98I−01