engine TOYOTA T100 1996 Factory Service Manual

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OX Signal Waveform (Oscilloscope)
1.0 V
0 V
200 msec. /Division
− DIAGNOSTICSENGINE (3RZ−FE)
DI−87
1996 TOYOTA T100 (RM449U)
(1) Connect the OBD ll scan tool or TOYOTA hand−held tester to the DLC3.
(2) Start engine and warm it up with all accessories switched OFF until the water temperature is stable.
(3) Race the engine at 2500 − 3000 rpm for about 3 min.
(4) After confirming that the waveform of the heated oxygen sensor, bank 1 sensor 1 (OX1), oscillate around
0.5 V during feedback to the ECM, check the waveform of the heated oxygen sensor bank 1 sensor 2 (OX2).
HINT:
If there is a malfunction in the system, the waveform of the
heated oxygen sensor bank 1 sensor 2 (OX2) is almost the
same as that of the heated oxygen sensor bank 1 sensor 1
(OX1) on the left.
There are some cases where, even though a malfunction
exists, the MIL may either light up or not light up.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0420) being output?
YES Go to relevant DTC chart.
NO
2 Check heated oxygen sensor (bank 1 sensor 1) (See page DI−47).
NG Repair or replace.
OK
3 Check heated oxygen sensor (bank 1 sensor 2) (See page DI−53).
NG Repair or replace.
OK
Replace TWC (three−way catalytic convert-
er) (See page EM−104).

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ECM VSV for EVAP
Throttle
Valve
Fuel Tank Charcoal
CanisterFig 1
A00647
IG Switch
(M/T)(A/T)
23W−G
2
1
EFI
EFI Relay
VSV for
ECM From From
Battery
22
2
2
223 2
E7 E5
EA
W−B
IE2W−G1 R/B No.2
PRG
E01 4EVAP5
EA1
W−RW−R
921
B−W
DI−88
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0441 Evaporative Emission Control System
Incorrect Purge Flow
CIRCUIT DESCRIPTION
To reduce HC emissions, evaporated fuel from the fuel tank is
routed through the charcoal canister to the intake manifold for
combustion in the cylinders.
The ECM changes the duty signal to the VSV for EVAP so that
the intake quantity of HC emissions is appropriate for the driving
conditions (engine load, engine speed, vehicle speed, etc.) af-
ter the engine is warmed up.
DTC No.DTC Detecting ConditionTrouble Area
P0441Proper response to computer command does not occur
(2 trip detection logic)
Open or short in VSV circuit for EVAP
VSV for EVAP
ECM
Vacuum hose cracks, hole, blocked, damaged or
disconnected
Charcoal canister
WIRING DIAGRAM
DI0TX−03

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FI7205 FI7206
A00071
VSV is ON VSV is OFFON
Air
E
FAir
EF
− DIAGNOSTICSENGINE (3RZ−FE)
DI−89
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and check operation of VSV for EVAP.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand−held tes-
ter main switch ON.
(c) Select the ”ACTIVE TEST” mode on the TOYOTA hand−
held tester.
CHECK:
Check operation of VSV when it is operated by the TOYOTA
hand−held tester.
OK:
(1) VSV is ON:
Air flows from port E to port F.
(2) VSV is OFF:
Air does not flow from port E to port F.
OK Go to step 4.
NG
2 Check operation of VSV for EVAP (See page MF−44).
NG Replace VSV for EVAP.
OK
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and ECM (See page IN−26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine A00771
ON
For M/T
For A/TPRG (+)
PRG (+)
DI−90
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
4 Check connection of vacuum hose (See Fig 1 in circuit description).
NG Repair or replace.
OK
Check and repair charcoal canister (See
page EC−5).
OBD II scan tool (excluding TOYOTA hand−held tester):
1 Check operation of VSV for EVAP (See page MF−43).
NG Replace VSV for EVAP.
OK
2 Check voltage between terminal PRG of ECM connector and body ground.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Turn the ignition switch ON.
CHECK:
Measuve voltage between terminal PRG of ECM connector and
body ground.
OK:
Voltage: 9 − 14 V
NG Check and repair harness or connector.
OK

Downloaded from www.Manualslib.com manuals search engine − DIAGNOSTICSENGINE (3RZ−FE)
DI−91
1996 TOYOTA T100 (RM449U)
3 Check connection of vacuum hose (See Fig 1 in circuit description).
NG Repair or replace.
OK
4 Check charcoal canister (See page EC−5).
NG Repair or replace.
OK
Check and replace ECM (See page IN−26).

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A00081
CableTo Speedometer Cable
T/M4−pulse
ECMMagnet Reed Switch
No.1 Vehicle Speed SensorCombination
Meter
P19617
ECM From Cruise
Control ECU
Combination Meter5 V
E1 SP1
E4 E4
(M/T)(A/T) G (M/T) G (M/T)
G (A/T)IE198
10
No.1
Vehicle
Speed
Sensor6
GG
C11
DI−92
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
This No.1 vehicle speed sensor is mounted in the combination meter. It contains a magnet which is rotated
by the speed meter cable.
Turning the reed switch ON and OFF 4 times for every revolution of the speedmeter.
It is then transmitted to the ECM. The ECM determines the vehicle speed based on the frequency of these
pluse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
No vehicle speed sensor signal to ECM under conditions (a)
(2 trip detection logic)
(a) Vehicle is being drivenOpen or short in No.1 vehicle speed sensor circuit
No.1 vehicle speed sensor
ECM
Speedometer cable
WIRING DIAGRAM
DI0TY−05

Downloaded from www.Manualslib.com manuals search engine P24206
P24205 BE6653A00082
ON
For M/T
For A/TSP1 (+)
SP1 (+)
AT7809
4.5 − 5.5 V
0
Turn wheel
− DIAGNOSTICSENGINE (3RZ−FE)
DI−93
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 sensor is operating normally if the speedometer display is normal.
NG Check speedometer (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 MF−50).
(b) Disconnect the cruise control ECU connector.
(c) Shift the shift lever to neutral.
(d) Jack up the rear wheels 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 be-
tween combination meter and ECM.
OK
Check and replace ECM (See page IN−26).

Downloaded from www.Manualslib.com manuals search engine P01559
Throttle Valve
To Cylinder ECM
Signal
From
Air
Cleaner
Valve
IAC Valve
Intake Air
Chamber
P19957
ECM
RSC
RSOE01
E01 V−Y
V−R96
10 7 E7 E7
E7 E7
(M/T)(A/T)
3
1 IAC
Valve
W−R IG Switch FromFrom Battery
R/B No.2EFI Relay
EFI2
IE1
EA1
W−R
9
9
EA
W−R
W−B 2
2
2 B−W
22
15 2
2
B−Y
EA1
W−R
B−Y
4
IGN
J/B
No.11A
1C 3
17
3 DI−94
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
DTC P0505 Idle Control System Malfunction
CIRCUIT DESCRIPTION
The rotary solenoid type IAC valve is located in front of the in-
take air chamber and intake air bypassing the throttle valve is
directed to the IAC valve through a passage.
In this way the intake air volume bypassing the throttle valve is
regulated, controlling the engine speed.
The ECM operates only the IAC valve to perform idle−up and
provide feedback for the target idling speed.
DTC No.DTC Detecting ConditionTrouble Area
P0505Idle speed continues to vary greatly from target speed
(2 trip detection logic)IAC valve is stuck or closed
Open or short in IAC valve circuit
Air intake (hose loose)
WIRING DIAGRAM
DI0TZ−03

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P24207
P24208
A00083
ON
For M/T
RSO (+) RSC (+)
For A/T
RSO (+) RSC (+)E7 Connector
E7 Connector
− DIAGNOSTICSENGINE (3RZ−FE)
DI−95
1996 TOYOTA T100 (RM449U)
INSPECTION PROCEDURE
1 Check air induction system (See page MF−1).
NG Repair or replace.
OK
2 Check voltage between terminals RSO and RSC of ECM connector and body
ground.
PREPARATION:
(a) Remove the right cowl side trim (See page MF−50).
(b) Disconnect the E7 connector of the ECM.
(c) Turn the ignition switch ON.
CHECK:
Measure voltage between terminals RSO and RSC of ECM
connector and body ground.
OK:
Voltage: 9 − 14 V
OK Go to step 4.
NG

Downloaded from www.Manualslib.com manuals search engine DI−96
− DIAGNOSTICSENGINE (3RZ−FE)
1996 TOYOTA T100 (RM449U)
3 Check IAC valve (See page MF−31).
NG Replace IAC valve.
OK
Check for open and short in harness and con-
nector between R/B No.2 and IAC valve, IAC
valve and ECM (See page IN−26).
4 Check operation of IAC valve (See page MF−31).
NG Repair or replace IAC valve.
OK
Check and replace ECM (See page IN−26).