check engine light TOYOTA T100 1996 Factory Owner's Guide

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w/o Tachometer
w/ Tachometer
DI0VF−02
Q08498
TOYOTA Hand−Held Tester
DLC3
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−265
1996 TOYOTA T100 (RM449U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Description
When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you connect to the vehicle an OBD II scan
tool complying with SAE J1978 or TOYOTA hand−
held tester, and read off various data output from
the vehicle’s ECM.
OBD II regulations require that the vehicle’s on−
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in drive system components which affect vehicle
emissions. In addition to the MIL lighting up when
a malfunction is detected, the applicable DTCs pre-
scribed by SAE J2012 are recorded in the ECM
memory.
(3RZ−FE: See page DI−13)
(5VZ−FE: See page DI−140)
If the malfunction only occurs in 3 trips, the MIL goes off but the
DTCs remain recorded in the ECM memory.
To check the DTCs, connect an OBD II scan tool or
TOYOTA hand−held tester to DLC3 on the vehicle.
The OBD II scan tool or TOYOTA hand−held tester
also enables you to erase the DTCs and check
freeze frame data and various forms of engine data
(For instruction book).
DTCs include SAE controlled codes and Manufac-
turer controlled codes.
SAE controlled codes must be set as prescribed by
the SAE, while Manufacturer controlled codes can
be set freely by the manufacturer within the pre-
scribed limits (See DTC chart on page DI−276).

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DI−266
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
The diagnosis system operates in normal mode
during normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2 trip detection logic(*) to prevent erroneous detec-
tion. By switching the ECM to check mode when
troubleshooting, the technician can cause the MIL
to light up and for a malfunction that is only detected
once or momentarily (TOYOTA hand−held tester)
(See page DI−265).
*2 trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the ECM memory.
If the same malfunction is detected again during the
2nd test drive, this 2nd detection causes the MIL to
light up.
(b) Inspect the DLC3.
The vehicle’s ECM uses the V.P.W. (Variable Pulse Width)
for communication to comply with SAE J1850. The termi-
nal arrangement of DLC3 complies with SAE J1962 and
matches the V.P.W. format.
Terminal No.Connection / Voltage or ResistanceCondition
2Bus  Line / Pulse generationDuring communication
4Chassis Ground ↔ Body / 1 Ω or lessAlways
5Signal Ground ↔ Body / 1 Ω or lessAlways
16Battery Positive ↔ Body / 9 − 14 VAlways
HINT:
If your display shows ”UNABLE TO CONNECT TO VEHICLE”
when you have connected the cable of OBD II scan tool or TOY-
OTA hand−held tester to DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.
If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.
If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool’s instruction manual.

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w/o Tachometer
w/ Tachometer
Q08498
TOYOTA Hand−Held Tester
DLC3
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−267
1996 TOYOTA T100 (RM449U)
2. INSPECT DIAGNOSIS (NORMAL MODE)
(a) Check the MIL.
(1) The MIL comes on when the ignition switch is turned
ON and the engine is not running.
HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page BE−38).
(2) When the engine is started, the MIL should go off.
If the lamp remains on, the diagnosis system has
detected a malfunction or abnormality in the sys-
tem.
(b) Check the DTC.
NOTICE:
TOYOTA hand−held tester only: When the diagnostic sys-
tem is switched from normal mode to check mode, it erases
all DTCs and freezed frame data recorded in normal mode.
So before switching modes, always check the DTCs and
freezed frame data, and note them down.
(1) Prepare an OBD II scan tool (complying with SAE
J1978) or TOYOTA hand−held tester.
(2) Connect the OBD II scan tool or TOYOTA hand−
held tester to DLC3 at the lower of the instrument
panel.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or TOYOTA hand−held tester switch ON.
(4) Use the OBD II scan tool or TOYOTA hand−held
tester to check the DTCs and freezed frame data
and note them down (For operating instructions,
see the OBD II scan tool’s instruction book).
(5) See page DI−276 to confirm the details of the
DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding TOYOTA hand−held tester) to check the DTCs, use
normal mode. For codes on the DTCs chart subject to ”2
trip detection logic”, turn the ignition switch off after the
symptoms have been simulated the 1st time. Then repeat
the simulation process again. When the program has been
simulated twice, the MIL lights up and the DTCs are re-
corded in the ECM.

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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).

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N
R
P
AT5115
Neutral Basic line
Bolt
Groove
DI−272
− DIAGNOSTICSAUTOMATIC TRANSMISSION
1996 TOYOTA T100 (RM449U)
(3) Return the No.1 gear shifting rod 2 notches to N
position.
(4) Set the shift lever to N position.
(5) While holding the shift lever lightly toward the R
position side, adjust the No.1 gear shifting rod nut.
(6) Tighten the No.1 gear shifting rod nut.
Torque: 25 N·m (260 kgf·cm, 19 ft·lbf)
(7) Start the engine and make sure that the vehicle
moves forward when shifting the lever from the N to
D position and reverses when shifting it to the R
position.
(g) Inspect and adjust the park/neutral position.
Check that the engine can be started with the shift lever
only in the N or P position, but not in other positions.If it
is not as stated above, carry out the following adjustment
procedure.
(1) Loosen the park/neutral position switch bolt and set
the shift lever to the N position.
(2) Align the groove and neutral basic line.
(3) Hold in position and tighten the bolt.
Torque: 13 N·m (130 kgf·cm, 10 ft·lbf)
(h) Check the idle speed.
Idle speed (In N position and air conditioner OFF):
3RZ−FE: 700 ± 50 rpm
5VZ−FE: 700 ± 50 rpm
6. MECHANICAL SYSTEM TESTS
(a) Measure the stall speed.
The object of this test is to check the overall performance of the transmission and engine by measuring
the stall speeds in the D and R positions.
NOTICE:
Do the that at normal operating fluid temperature 50 − 80°C (122 − 176°F)
Do not continuously run this test longer than 5 seconds.
To ensure safety, conduct this test in a wide, clear, level area which provides good traction.
The stall test should always be carried out in pairs. One technician should observe the condi-
tions of wheels or wheel stoppers outside the vehicle while the other is doing the test.
(1) Chock the 4 wheels.
(2) Connect an OBD II scan tool or TOYOTA hand−held tester to DLC3.
(3) Fully apply the parking brake.
(4) Keep your left foot pressed firmly on the brake pedal.
(5) Start the engine.
(6) Shift into the D position. Press all the way down on the accelerator pedal with your right foot.
Quickly read the stall speed at this time.
Stall speed:
3RZ−FE: 1,950 ± 150 rpm
5VZ−FE: 2,150 ± 150 rpm
(7) Do the same test in R position.
Stall speed:
3RZ−FE: 1,950 ± 150 rpm
5VZ−FE: 2,150 ± 150 rpm

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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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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

Downloaded from www.Manualslib.com manuals search engine BE3840
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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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