1996 TOYOTA T100 display

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DI−139
1996 TOYOTA T100 (RM449U)
(b) TOYOTA Enhanced Signals.
TOYOTA hand−held tester displayMeasurement ItemNormal Condition*1
MISFIRE RPMEngine RPM for first misfire rangeMisfire 0: 0 rpm
MISFIRE LOADEngine load for first misfire rangeMisfire 0: 0 g/r
INJECTORFuel injection time for cylinder No.1Idling: 1.82 − 3.15 ms
IAC DUTY RATIOIntake Air Control Valve Duty Ratio
Opening ratio rotary solenoid type IAC valveIdling: 22 − 46 %
STARTER SIGStarter SignalCranking: ON
A/C SIGA/C Switch SignalA/C ON: ON
PNP SWPark/Neutral Position Switch SignalP or N position: ON
STOP LIGHT SWStop Light Switch SignalStop light switch ON: ON
FC IDLFuel Cut Idle: Fuel cut when throttle valve fully
closed, during decelerationFuel cut operating: ON
FC TAUFuel Cut TAU: Fuel cut during very light loadFuel cut operating: ON
CYL #1 − CYL #6Abnormal revolution variation for each cylinder0 %
IGNITIONTotal number of ignition for every 1,000
revolutions0 − 3,000
EGRT GAS*2EGR Gas Temp. Sensor Value
EGR not operating:
Temp. between intake air temp. and engine
coolant temp.
EGR SYSTEM*2EGR System Operating ConditionIdling: OFF
A/C CUT SIGA/C Cut SignalA/C S/W OFF: ON
FUEL PUMPFuel Pump SignalIdling: ON
EVAP (PURGE) VSVEVAP VSV SignalVSV operating: ON
VAPOR PRESS VSVVapor Pressure VSV SignalVSV operating: ON
TOTAL FT B1Total Fuel Trim Bank 1: Average value for fuel
trim system of bank 1Idling: 0.8 − 1.2 V
O2 LR B1, S1
Oxygen Sensor Lean Rich Bank 1, Sensor 1 Re-
sponse time for oxygen sensor output to switch
from lean to rich
Idling after warming up: 0 − 1,000 msec.
O2 RL B1, S1
Oxygen Sensor Rich Lean Bank 1, Sensor 1 Re-
sponse time for oxygen sensor output to switch
from rich to lean
Idling after warming up: 0 − 1,000 msec.
*1: If no conditions are specifically stated for ”ldling”, it means the shift lever is at N or P position, the A/C
switch is OFF and all accessory switches are OFF.
*2: Only for 2WD models with a load capacity of 0.5 ton and regular cab.

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DI−140
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DIAGNOSTIC TROUBLE CODE CHART
SAE CONTROLLED
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instrument
or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code listed
in the table below. For details of each code, turn to the page referred to under the ’’See Page ’’ for the respec-
tive ’’DTC No.’’ in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble AreaMIL*Memory
P0100
(DI−149)Mass Air Flow Circuit
MalfunctionOpen or short in mass air flow meter circuit
Mass air flow meter
ECM

P0101
(DI−153)Mass Air Flow Circuit
Range/Performance
Problem
Mass air flow meter
P0110
(DI−154)Intake Air Temp. Circuit
MalfunctionOpen or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM

P0115
(DI−158)Engine Coolant Temp. Circuit
MalfunctionOpen or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM

P0116
(DI−162)Engine Coolant Temp. Circuit
Range/Performance ProblemEngine coolant temp. sensor
Cooling system
P0120
(DI−163)Throttle/Pedal Position
Sensor/Switch ”A” Circuit
MalfunctionOpen or short in throttle position sensor circuit
Throttle position sensor
ECM

P0121
(DI−168)Throttle/Pedal Position
Sensor/Switch ”A” Circuit
Range/Performance Problem
Throttle position sensor
P0125
(DI−169)Insufficient Coolant Temp. for
Closed Loop Fuel ControlOpen or short in heated oxygen sensor (bank 1 sensor 1)
circuit
Heated oxygen sensor (bank 1 sensor 1)

P0130
(DI−172)Heated Oxygen Sensor Circuit
Malfunction (Bank 1 Sensor 1)Heated oxygen sensor
Fuel trim malfunction
P0133
(DI−175)Heated Oxygen Sensor Circuit
Slow Response
(Bank 1 Sensor 1)
Heated oxygen sensor
P0135
(DI−176)Heated Oxygen Sensor Heater
Circuit Malfunction
(Bank 1 Sensor 1)Open or short in heater circuit of heated oxygen sensor
Heated oxygen sensor
ECM

P0136
(DI−178)Heated Oxygen Sensor Circuit
Malfunction
(Bank 1 Sensor 2)
Heated oxygen sensor
P0141
(DI−176)Heated Oxygen Sensor Heater
Circuit Malfunction
(Bank 1 Sensor 2)
Same as DTC No. P0135
*:  MIL lights up

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(fig. 1)
Acceptable
Resistance kΩ
− 20 0 20 40 60 80 100
(− 4) 32 68 104 140 176 212 30
20
10
5
3
2
1
0.5
0.3
0.2
0.1
Temp.°C (F°)
DI−154
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0110 Intake Air Temp. Circuit Malfunction
CIRCUIT DESCRIPTION
The intake air temp. sensor is built into the mass air flow meter
and senses the intake air temp.
A thermistor built in the sensor changes the resistance value
according to the intake air temp.
The lower the intake air temp., the greater the thermistor resis-
tance value, and the higher the intake air temp., the lower the
thermistor resistance value (See fig. 1).
The intake air temp. sensor is connected to the ECM (See be-
low ). The 5 V power source voltage in the ECM is applied to the
intake air temp. sensor from the terminal THA via resistor R.
That is, the resistor R and the intake air temp. sensor are con-
nected in series. When the resistance value of the intake air
temp. sensor changes in accordance with changes in the intake
air temp., the potential at terminal THA also changes. Based on
this signal, the ECM increases the fuel injection volume to im-
prove driveability during cold engine operation.
If the ECM detects the DTC ”P0110”, it operates the fail safe
function in which the intake air temp. is assumed to be 20°C
(68°F).
DTC No.DTC Detecting ConditionTrouble Area
P0110Open or short in intake air temp. sensor circuit
Open or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM
HINT:
After confirming DTC P0110 use the OBD II scan tool or TOYOTA hand−held tester to confirm the intake
air temp. from ”CURRENT DATA”.
Temp. DisplayedMalfunction
− 40°C ( − 40°F )Open circuit
140°C ( 284°F ) or moreShort circuit
DI0UI−01

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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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Vehicle Speed
70 ∼ 90 km/h
(43 ∼ 56 km/h)
Idling
IG SW OFF(2)
(1)(3)
(4)(5)
(6)
Warm up 3 ∼ 5 min. 3 ∼ 5 min. 2 min. 2 min.
Time
− DIAGNOSTICSENGINE (5VZ−FE)
DI−197
1996 TOYOTA T100 (RM449U)
SYSTEM CHECK DRIVING PATTERN
(1) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(2) Start and warm up the engine with all the accessories switched OFF.
(3) Run the vehicle at 70 − 90 km/h (43 − 56 mph) for 3 min. or more.
(4) Idle the engine for about 2 min.
(5) Do steps (3) and (4) again.
(6) Check the ”READINESS TESTS” mode on the OBD II scan tool or TOYOTA hand−held tester.
If ”COMPL” is displayed and the MIL does not light up, the system is normal.
If ”INCMPL” is displayed and the MIL does not light up, run the vehicle step (5) from some time and check
it.
HINT:
”INCMPL” is displayed when either condition (a) or (b) exists:
(a) The system check is incomplete.
(b) There is a malfunction in the system.
If there is a malfunction in the system, the MIL will light up after steps (2) to (5) above are done.

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P24205
P24324A00120
ON
SP1 (+)
SP1 (+)
For M/T
For A/T
AT7809
4 ∼ 6 V
Turn Wheel
− DIAGNOSTICSENGINE (5VZ−FE)
DI−227
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed is operating normally if the speedometer display is normal.
NG Check speedometer and cable
(See page BE−38).
OK
2 Check voltage between terminal SP1 of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Disconnect the cruise control ECU connector.
(c) Shift the shift lever to neutral.
(d) Jack up the rear wheel on one side.
(e) Turn the ignition switch ON.
CHECK:
Measure voltage between terminal SP1 of ECM connector and
body ground when the wheel is turned slowly.
OK:
Voltage is generated intermittently.
NG Check and repair harness and connector
between combination meter and ECM.
OK
Check and replace ECM (See page IN−26).

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Vehicle Brought to Workshop
Customer Problem Analysis
Check DTC and Freezes Frame Data (Precheck)
Record or Print DTC and Freezed Frame Data P.
DI−265
Clear DTC and Freezed Frame Data P. DI−265
Visual Inspection
Setting the Check Mode Diagnosis P.
DI−265
1
Items insideare titles of pages in this manual, with the
page number indicated in the bottom portion. See the indicated
pages for detailed explanations.
P.
DI−264
Connect an OBD II scan tool or TOYOTA hand−held tester to DLC3
If the display shows ”UNABLE TO CONNECT TO VEHICLE” when you have connected the
scan tool/TOYOTA hand−held tester, inspect DLC3 P.
DI−265
2
3
4
5
6
symptom does not occur
Problem Symptom Confirmation8
7Symptom Simulation
P.
IN−16symptom occur
DTC Check
P. DI−265OK Code
11Preliminary Check
P.
DI−265
DTC Chart
P.
DI−276
Mechanical System Tests
P.
DI−265
Manual Shifting Test
P.
DI−265 OK
OK
Chapter 1
(Electronic)Chapter 2
(On−Vehicle)OKChapter 3
(Off−Vehicle)OK Problem Symptoms table
P. DI−282
Circuit
Inspection O/D Cancel Signal Check
 Stop Light Signal Check
NG
Parts Inspection
NG
NGNG
Identification of ProblemRepairConfirmation TestEnd
NG
NG
12
NG13
14
1516
17 9
10
P. DI−282
P. DI−286 to DI−316
18
P. DI−282P. DI−282
− DIAGNOSTICSAUTOMATIC TRANSMISSION
DI−263
520 Author: Date:
1996 TOYOTA T100 (RM449U)
AUTOMATIC TRANSMISSION
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following page.

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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.