sensor TOYOTA T100 1996 Factory Service Manual

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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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DI−141
1996 TOYOTA T100 (RM449U) DTC No.
(See Page)
Detection ItemTrouble AreaMILMemory
P0171
(DI−180)System too Lean
(Fuel Trim)
Air intake (hose loose)
Fuel line pressure
Injector blockage
Heated oxygen sensor (bank 1 sensor 1) malfunction
Mass air flow meter
Engine coolant temp. sensor
*1
P0172
(DI−180)System too Rich
(Fuel Trim)
Fuel line pressure
Injector leak, blockage
Heated oxygen sensor (bank 1 sensor 1) malfunction
Mass air flow meter
Engine coolant temp. sensor
*1
P0300
(DI−183)Random/Multiple Cylinder
Misfire DetectedIgnition system
Injector
Fuel line pressure
EGR*3
Compression pressure
Valve clearance not to specification
Valve timing
Mass air flow meter
Engine coolant temp. sensor*2
P0301
P0302
P0303
P0304
P0305
P0306
(DI−183)Misfire Detected
− Cylinder 1
− Cylinder 2
− Cylinder 3
− Cylinder 4
− Cylinder 5
− Cylinder 6
*2
P0325
(DI−188)Knock Sensor 1 Circuit
MalfunctionOpen or short in knock sensor 1 circuit
Knock sensor 1 (looseness)
ECM
*1
P0330
(DI−188)Knock Sensor 2 Circuit
MalfunctionOpen or short in knock sensor 2 circuit
Knock sensor 2 (looseness)
ECM
*1
P0335
(DI−191)Crankshaft Position Sensor
”A” Circuit Malfunction
Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Starter
ECM
*1 
P0340
(DI−194)Camshaft Position Sensor
Circuit Malfunction
Open or short in camshaft position sensor circuit
Camshaft position sensor
Starter
ECM
*1 
P0401*3
(DI−196)Exhaust Gas Recirculation
Flow Insufficient Detected
EGR valve stuck closed
Short in VSV circuit for EGR
Open in EGR gas temp. sensor circuit
EGR hose disconnected
ECM
*1 
P0402*3
(DI−206)Exhaust Gas Recirculation
Flow Excessive Detected
EGR valve stuck open
EGR VSV open malfunction
Open in VSV circuit for EGR
Short in EGR gas temp. sensor circuit
ECM
*1
P0420
(DI−210)Catalyst System Efficiency
Below Threshold
Three−way catalytic converter
Open or short in heated oxygen sensor (bank 1 sensor 1, 2)
circuit
Heated oxygen sensor (bank 1 sensor 1, 2)
*1
*1: MIL lights up
*2: MIL lights up or blinking
*3: Only for 2WD models with a load capacity of 0.5 ton and regular cab.

Downloaded from www.Manualslib.com manuals search engine DI−142
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U) DTC No.
(See Page)
Detection ItemTrouble AreaMIL*Memory
P0441
(DI−212)Evaporative Emission Control
System Incorrect Purge Flow
Open or short in VSV circuit for EVAP
VSV for EVAP
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Open or short in VSV circuit for vapor pressure sensor
VSV for vapor pressure sensor
Vacuum hose cracked, holed, blocked, damaged or
disconnected
Charcoal canister cracked, holed or damaged

P0500
(DI−226)Vehicle Speed Sensor
Malfunction
Open or short in No.1 vehicle speed sensor circuit
No.1 vehicle speed sensor
ECM
Speedometer cable

P0505
(DI−228)Idle Control System
Malfunction
IAC valve is stuck or closed
Open or short in IAC valve circuit
Open or short in A/C signal circuit
Air intake (hose loose)

P0510
(DI−231)Closed Throttle Position Switch
MalfunctionOpen in closed throttle position switch circuit
Closed throttle position switch
ECM

*:  MIL lights up
MANUFACTURER CONTROLLED
DTC No.
(See Page)Detection ItemTrouble AreaMIL*Memory
P1300
(DI−235)Igniter Circuit Malfunction
Open or short in IGF or IGT circuit from igniter to ECM
Igniter
ECM

P1335
(DI−241)Crankshaft Position Sensor
Circuit Malfunction
(during engine running)Open or short in crankshaft position sensor circuit
Crankshaft position sensor
Starter
ECM
−
P1500
(DI−242)Starter Signal Circuit Malfunction
Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM
−
P1600
(DI−244)ECM BATT MalfunctionOpen in back up power source circuit
ECM
P1605
(DI−246)Knock Control CPU MalfunctionECM
P1780
(DI−247)Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
Park/neutral position switch
ECM

*: −  MIL does not light up,   MIL lights up

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A00783
DLC3
EGR Gas Temp. Sensor*
A/C Amplifier
Circuit Opening Replay
ECM
Throttle Position Sensor
IAC Valve
Igniter
Mass Air
Flow MeterHeated Oxygen Sensor (Bank 1 Sensor 1)
Combination Meter
Heated Oxygen
Sensor (Bank 1
Sensor 2)
Park/Neutral
Position Switch
Fuel Pump
Ignition Switch
VSV for EGR*
Stop Light Switch
VSV for Vapor Pressure Sensor
VSV for EVAP
EFI Main Relay
(Marking : EFI)
DLC1 Knock Sensor 2 Knock Sensor 1Injector Ignition Coil Injector
Camshaft
Position Sensor
Engine Coolant
Temp. Sensor
Crankshaft Position
Sensor
*: Only for 2WD models with a load capacity of 0.5 ton and regular cab.
− DIAGNOSTICSENGINE (5VZ−FE)
DI−143
1996 TOYOTA T100 (RM449U)
PARTS LOCATION

Downloaded from www.Manualslib.com manuals search engine FI4741
(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
Intake Air Temp. Sensor
(Built into mass air flow meter)
3
4Y−G
BR−BE6
E6 E6E65 V
THA
E2 12 14
922
(M/T)(A/T)R
E1
− DIAGNOSTICSENGINE (5VZ−FE)
DI−155
1996 TOYOTA T100 (RM449U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
If DTCs P0110, P0115 and P0120 are output simultaneously, E2 (Sensor Ground) may be open.
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value of
intake air temp.
PREPARATION:
(a) Connector the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or TOYOTA hand−held tester main switch
ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA hand−held tester.
OK:
Same as actual intake air temp.
HINT:
If there is open circuit, OBD II scan tool or TOYOTA hand−held tester indicates − 40°C ( 40°F).
If there is short circuit, OBD II scan tool or TOYOTA hand−held tester indicates 140°C (284°F) or more.
NG − 40°C (− 40°F) ... Go to step 2.
140°C (284°F) or more ... Go to step 4.
OK
Check for intermittent problems
(See page DI−129).

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P19555
A00046
ON
ECM Intake Air
Temp. Sensor
E2
E15 V
12 14
922THA3
4
E6 E6 E6
E6
(A/T) (M/T)
BE6653
P19553
P20223
P20199
A00102
For M/T
For A/TON
Intake Air
Temp. SensorECM
3
4
12 14
922
E2
E15 V
THA
E6 E6
E6 E6
THA E2
THA E2
(M/T)(A/T)
DI−156
− DIAGNOSTICSENGINE (5VZ−FE)
1996 TOYOTA T100 (RM449U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Connect the sensor wire harness terminals together.
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: 140°C (284°F) or more
OK Confirm good connection at sensor. If OK,
replace mass air flow meter.
NG
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Connect between terminals THA and E2 of the ECM
connector.
HINT:
The mass air flow meter connector is disconnected.
Before checking, do a visual and contact pressure check for the
ECM connector (See page IN−26).
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: 140°C (284°F) or more
OK Open in harness between terminals E2 or THA,
repair or replace harness.
NG
Confirm good connection at ECM.
If OK, check and replace ECM.

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P19554
A00048
ON
Intake Air
Temp. SensorECM
3
4
5 V
E2
12 14
922
E1
(A/T) (M/T)THA
E6
E6E6
E6
BE6653
FI7056
P19798
FI7034
A00103
ON
ECM Intake Air
Temp. Sensor
E2
E1
THA5 V
E6 Connector
E6 Connector
For M/T
For A/T
− DIAGNOSTICSENGINE (5VZ−FE)
DI−157
1996 TOYOTA T100 (RM449U)
4 Check for short in harness and ECM.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: − 40°C (− 40°F)
OK Replace mass air flow meter.
NG
5 Check for short in harness or ECM.
PREPARATION:
(a) Remove the right cowl side trim (See page SF−61).
(b) Disconnect the E6 connector of the ECM.
HINT:
The mass air flow meter connector is disconnected.
(c) Turn the ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand−held tester.
OK:
Temp. value: − 40°C (− 40°F)
OK Repair or replace harness or connector.
NG
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine P19947
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