Page 4097 of 4770
SF0EK±03
S05303
Ohmmeter
HT +B
± SFI (5S±FE)HEATED OXYGEN SENSOR (Bank 1 Sensor 2)
SF±63
1496 Author: Date:
INSPECTION
1. INSPECT HEATER RESISTANCE OF HEATED OXY-
GEN SENSOR
(a) Disconnect the oxygen sensor connector.
(b) Using an ohmmeter, measure the resistance between ter-
minals +B and HT.
Resistance: 11 ± 16 W at 20°C (68°F)
If the resistance is not as specified, replace the sensor.
Torque: 44 N´m (450 kgf´cm, 32 ft´lbf)
(c) Reconnect the oxygen sensor connector.
2. INSPECT OPERATION OF HEATED OXYGEN SEN-
SOR (See page DI±75)
Page 4098 of 4770
SF0EL±03
S06018
No.2 Instrument Lower Panel
Under CoverECM ConnectorECM
Cowl Side Trim
Front Door Inside Scuff Plate SF±64
± SFI (5S±FE)ENGINE CONTROL MODULE (ECM)
1497 Author: Date:
ENGINE CONTROL MODULE (ECM)
COMPONENTS
Page 4099 of 4770
SF0EM±03
± SFI (5S±FE)ENGINE CONTROL MODULE (ECM)
SF±65
1498 Author: Date:
INSPECTION
1. REMOVE ECM
2. INSPECT ECM (See page DI±22)
3. REINSTALL ECM
Page 4100 of 4770
SF0EN±03
S05331
S05304
Sound
Scope SF±66
± SFI (5S±FE)FUEL CUT RPM
1499 Author: Date:
FUEL CUT RPM
INSPECTION
1. WARM UP ENGINE
Allow the engine to warm up to normal operating temperature.
2. CONNECT TOYOTA HAND±HELD TESTER OR OBDII
SCAN TOOL
(a) Remove the fuse cover on the instrument panel.
(b) Connect a TOYOTA hand±held tester or OBDII scan tool
to the DLC3.
(c) Please refer to the TOYOTA hand±held tester or OBDII
scan tool operator's manual for further details.
3. INSPECT FUEL CUT RPM OPERATION
(a) Increase the engine speed to at least 2,500 rpm.
(b) Check for injector operating noise.
(c) Check that when the throttle lever is released, injector op-
eration noise stops momentarily and then resumes.
HINT:
Measure with the A/C OFF.
Fuel return speed: 1,500 rpm
4. DISCONNECT TOYOTA HAND±HELD TESTER OR
OBDII SCAN TOOL
Page 4101 of 4770

SF078±03
± SFI (1MZ±FE)SFI SYSTEM
SF±1
1500 Author: Date:
SFI SYSTEM
PRECAUTION
1. BEFORE WORKING ON FUEL SYSTEM,
DISCONNECT NEGATIVE (±) TERMINAL CABLE
FROM BATTERY
HINT:
Any diagnostic trouble code retained by the computer will be
erased when the negative (±) terminal cable is removed from
the battery.
Therefore, if necessary, read the diagnosis before removing the
negative (±) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME
WHEN WORKING ON FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR
LEATHER PARTS
4. MAINTENANCE PRECAUTIONS
(a) In event of engine misfire, these precautions should be
taken.
(1) Check proper connection to battery terminals, etc.
(2) After repair work, check that the ignition coil termi-
nals and all other ignition system lines are recon-
nected securely.
(3) When cleaning the engine compartment, be espe-
cially careful to protect the electrical system from
water.
(b) Precautions when handling the oxygen sensor.
(1) Do not allow the oxygen sensor to drop or hit
against an object.
(2) Do not allow the sensor to come into contact with
water.
5. IF VEHICLE IS EQUIPPED WITH A MOBILE RADIO
SYSTEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication system,
refer to the precaution in the IN section.
6. AIR INDUCTION SYSTEM
(a) Separation of the engine oil dipstick, oil filler cap, PCV
hose, etc. may cause the engine to run out of tune.
(b) Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will allow air suction and cause the engine to run out
of tune.
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing SFI wiring connectors, terminals, etc.,
first disconnect the power by either turning the ignition
switch to LOCK or disconnecting the negative (±) terminal
cable from the battery.
HINT:
Always check the diagnostic trouble code before disconnecting
the negative (±) terminal cable from the battery.
Page 4102 of 4770

FI2553
SST
S04600
Fuel
Pump
Connector
S05039
Plug
SF±2
± SFI (1MZ±FE)SFI SYSTEM
1501 Author: Date:
(b) When installing the battery, be especially careful not to in-
correctly connect the positive (+) and negative (±) cables.
(c) Do not permit parts to receive a severe impact during re-
moval or installation. Handle all SFI parts carefully, espe-
cially the ECM.
(d) Be careful during troubleshooting as there are numerous
transistor circuit, and even slight terminal contact can
cause further troubles.
(e) Do not open the ECM cover.
(f) When inspecting during rainy weather, take care to pre-
vent entry of water. Also, when washing the engine
compartment, prevent water from getting on the SFI parts
and wiring connectors.
(g) Parts should be replaced as an assembly.
(h) Care should be taken when pulling out and inserting wir-
ing connectors.
(1) Release the lock and pull out the connector, pulling
on the connectors.
(2) Fully insert the connector and check that it is locked.
(i) Use SST for inspection or test of the injector or its wiring
connector.
SST 09842±30070
8. FUEL SYSTEM
(a) When disconnecting the high fuel pressure line, a large
amount of gasoline will spill out, so observe these proce-
dures:
(1) Disconnect the fuel pump connector.
(2) Start the engine. After the engine has stopped on
its own, turn the ignition switch to LOCK.
(3) Put a container under the connection.
(4) Slowly loosen the connection.
(5) Disconnect the connection.
(6) Plug the connection with a rubber plug.
Page 4103 of 4770

S05054
New Gasket
FI1654
Fulcrum Length
30 cm
SST
FI6372 FI6372
New O±Ring
Grommet
InjectorCORRECT
WRONG
± SFI (1MZ±FE)SFI SYSTEM
SF±3
1502 Author: Date:
(b) When connecting the union bolt on the high pressure pipe
union, observe these procedures:
(1) Always use 2 new gaskets.
(2) Tighten the union bolt by hand.
(3) Tighten the union bolt to the specified torque.
Torque: 32.5 N´m (330 kgf´cm, 24 ft´lbf)
(c) When connecting the flare nut on the high pressure pipe
union, observe these procedures:
(1) Apply a light coat of engine oil to the flare nut, and
tighten the flare nut by hand.
(2) Using SST, tighten the flare nut to specified torque.
SST 09631±22020
NOTICE:
Do not rotate the fuel pipe, when tightening the flare nut.
Torque: 28 N´m (285 kgf´cm, 21 ft´lbf) for using SST
HINT:
Use a torque wrench with a fulcrum length of 30 cm (11.81 in.).
(d) Observe these precautions when removing and installing
the injectors.
(1) Never reuse the O±ring.
(2) When placing a new O±ring on the injector, take
care not to damage it in any way.
(3) Coat a new O±ring with spindle oil or gasoline be-
fore installing±never use engine, gear or brake oil.
Page 4104 of 4770

B00630
O±Ring
Grommet
Spacer InsulatorDelivery Pipe California A/T
Except California A/TO±Ring
O±Ring
Grommet
Spacer InsulatorDelivery Pipe
O±Ring
S04583
S05040
Vinyl Bag SF±4
± SFI (1MZ±FE)SFI SYSTEM
1503 Author: Date:
(e) Install the injector to the delivery pipe and intake manifold,
as shown in the illustration.
Before installing the injector, must apply spindle oil or gas-
oline on the place where a delivery pipe or an intake man-
ifold touches an O±ring of the injector.
(f) Observe these precautions when disconnecting the fuel
tube connector (quick type).
(1) Check if there is any dirt like mud on the pipe and
around the connector before disconnecting them
and clean the dirt away.
(2) Be sure to disconnect with hands.
(3) When the connector and the pipe are stuck, pinch
the retainer between the hands, push and pull the
connector to free to disconnect and pull it out. Do
not use any tool at this time.
(4) Inspect if there is any dirt or the likes on the seal sur-
face of the disconnected pipe and clean it away.
(5) Prevent the disconnected pipe and connector from
damaging and mixing foreign objects by covering
them with a vinyl bag.