fuel injector TOYOTA CAMRY 2000 Service Owner's Guide

CIRCUIT DESCRIPTION
The main oxygen sensor is located in the exhaust manifold.
It indirectly determines whether the fuel mixture is rich or lean by detecting the concentration of
oxygen present in the exhaust gas.
Engine speed varies by more than 15 rpm over
the preceding crank position period during a period
of 50 sec. or more under conditions (a) and (b).
(2 trip detection logic) *
(a) Engine speed: Idling
(b) Engine coolant temp.: 60
C (140
F) or more (2) Engine speed varies by more than 15 rpm
over the preceding crank position period during
a period of 50 sec. or more under conditions
(a) and (b).
(2 trip detection logic) *
(a) Engine speed: Idling
(b) Engine coolant temp.: 60
C (140
F) or more.wOpen or short in injector circuit
wFuel line pressure (injector leak, blockage)
wMechanical system malfunction
(skipping teeth of timing belt)
wIgnition system
wCompression pressure
(foreign object caught in valve)
wAir leakage
wECM
wOpen or short in injector circuit
wFuel line pressure (injector leak, blockage)
wMechanical system malfunction
(skipping teeth of timing belt)
wIgnition system
wCompression pressure
(foreign object caught in valve)
wAir leakage
wECM (1) Main oxygen sensor voltage is 0.45 V or
less (lean) for 90 sec. under conditions (a)
and (b).
(2 trip detection logic) *
(a) Engine coolant temp.: 60
C (140
F) or more.
(b) Engine speed: 1,500 rpm or more.wOpen or short in main oxygen sensor circuit
wMain oxygen sensor
wIgnition system
w ECM Diagnostic Trouble Code Detecting Condition
*: See page EG1±307Trouble Area
DTC 25 26 Air±Fuel Ratio Lean Rich Malfunction
DTC No.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±363

Check each circuit found to be a possible cause of trouble according to the results of the check in
or . The numbers in the table below show the order in which the checks should be performed.Check for open and short in harness and connector between engine control module and
main oxygen sensor, engine control module and data link connector 1 (See page
IN±31).
Does malfunction disappear when a good main oxygen sensor is
installed?Check each item found to be a possible cause of problem.
Check compression (See page EG1±23).
Repair or replace harness or connector.
Check and replace engine control module.
Characteristics deviation in
manifold absolute pressure sensor.
Characteristics deviation
in engine coolant temp. sensor.
Replace main oxygen sensor.
*: Except California specification vehicles.Characteristics deviation
in intake air temp. sensor. Main oxygen sensor
signal continue at OV.
Repair or replace.
Repair or replace.
Faulty sensor installation.Possible Cause
Injector circuit
Valve timing
Fuel system Air leakageSee page
IG±6, 26*
YES
EG1±410
EG1±360 EG1±419
EG1±372 EG1±173
EG1±356 Misfire
EG1±36
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±367

Check each circuit found to be a possible cause of trouble according to the results of the check in
.The numbers in the table below show the order in which the checks should be performed.
Does malfunction disappear when a good main oxygen sensor is
installed? Check each item found to be a possible cause of problem.
Check compression (See page EG1±23).
Check and replace engine control module.
Characteristics deviation
in engine coolant temp. sensor.
Characteristics deviation in
manifold absolute pressure sensor.
Replace main oxygen sensor.
Main oxygen sensor
signal continue at 5.0 V.
x: Except California specification vehicles.Characteristics deviation
in intake air temp. sensor. Main oxygen sensor
signal is normal.
Repair or replace.
Repair or replace.
Possible Cause
Injector circuit
Valve timing
Fuel system Air leakageSee page
IG±6, 26*
YES
EG1±410
EG1±360 EG1±419
EG1±372 EG1±173
EG1±356 Misfire
EG1±36
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±368

Reference INSPECTION USING OSCILLOSCOPE
INJECTOR SIGNAL WAVEFORM
wWith the engine idling measure waveform between terminals #10, #20 (#1, #2, #3 and #4*)
and E01 of engine control module.
HINT: The correct waveform appears as shown in the illustration on the below.
CIRCUIT DESCRIPTION
The injectors are provided to the intake manifold. They inject fuel into the cylinders based on the
signals from the engine control module.
Check continuity between terminals E01, E02
and body ground. Check voltage of terminals #10 and #20
(#1. #2. #3 and #4*).
Check for open in harness and connector
between ECM and battery.Check for short in all the harness and
components connected to AM2 fuse.
*: Only for California specification vehicles.
Injector Circuit
Repair or replace harness or connector.
DIAGNOSTIC CHART
Check operation for injectors.
Check and replace ECM.Replace injector. Check AM2 fuse.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±410

Check injection volume of injector
(See page EG1±195).
wInjection volume
49 ± 59 cm
(3.0 ± 3.6 cu in.)/15 sec.
Difference between each injector:
Less than 5 cm3 (0.3 cu in.)
wLeakage
Fuel drop: One drop or less per minute. Disconnect injector connector
(See page EG1±189) .
Measure resistance of injector.
Check and replace engine control module.
Check injectors.
Replace injector. Resistance: Approx. 13.8

at 20C (68F)
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±414

42ENGINEÐ5S±FE ENGINE
5. Main Components of Engine Control System
The following table compares the main components of the new 5S±FE engine, and previous 5S±FE engine.
Model
NewPreviousComponentNewPrevious
Manifold Absolute Pressure SensorSemiconductoru
Throttle Position SensorLinear Typeu
Crankshaft Position SensorPick±Up Coil Type, 1u
Camshaft Position SensorPick±Up Coil Type, 1Ð
DistributorCamshaft PositionPick Up Coil Type 1DistributorSensorÐPick±Up Coil Type, 1
Knock SensorBuilt±In Piezoelectric
Element Type 1u
Oxygen Sensor
Heated Oxygen Sensor
(Bank 1, Sensor 1)*
1
(Bank 1, Sensor 2)
Air Fuel Ratio Sensor*
2
Oxygen Sensor
(Bank 1, Sensor 1)
(Bank 1, Sensor 2)
Injector2±Hole Typeu
IAC ValveRotary Solenoid Typeu
*1: Except for California Specification Models.
*
2: Only for California Specification Models.
Camshaft Position Sensor
The camshaft position sensor is mounted onto the
cylinder head. Using the protusion that is provided
on the timing pulley, the sensor generates 1 signal
for every revolution. This signal is then sent to the
ECM as a cranskshaft angle system.

CAMRY ± NEW FEATURES
150EG07 150EG06
Right Bank
Exhaust Manifold
WU-TWCLeft Bank
Exhaust Manifold
Exhaust Manifold
Cross-SectionOuter Pipe
Inner Pipe 8
3. Major Differences
The following changes have made to the 1MZ-FE engine.
Item
Details
Intake and Exhaust
System*
1
The exhaust manifolds adopt a double-wall construction consisting of
stainless steel pipes to improve the warm-up performance of the TWC.
WU-TWCs*
2 have been adopted to reduce exhaust emissions soon after
the engine is started.
Fuel System
4-hole type fuel injectors have been adopted to improve the atomization
of fuel.*
1
A quick connector is used to connect the fuel filter and the fuel hose
together to improve serviceability.
Engine Control
SystemAir-fuel ratio sensors have been adopted to improve the precision of the
air-fuel ratio feedback control.*
1
The engine immobiliser system has been integrated with the ECM.*3
*1: Only for California Specification Automatic Transaxle Model.
*
2: WU-TWC (Warm Up-Three-Way Catalytic Converter)
*
3: Applicable only to vehicle equipped with the Engine Immobiliser System.
4. Intake and Exhaust System (California Specification Automatic Transaxle Model)
Exhaust Manifold
The exhaust manifolds have been changed from the previous 3-layer type, in which ceramic wool is sand-
wiched, to the double-wall construction consisting of stainless steel pipes. As a result, the warm-up per-
formance of the TWC has been improved.
The left bank exhaust manifold integrates with a WU-TWC.

CAMRY ± NEW FEATURES
150EG05 150EG08
 Front
WU-TWC
WU-TWC30
m
Metallic Substrate
150EG09
9
Warm Up-Three-Way Catalytic Converter
In addition to the TWC that is provided under the floor of the previous model, WU-TWCs are provided
to reduce exhaust emissions soon after the engine is started.
The WU-TWC for the right bank is provided in the front exhaust pipe and in the exhaust manifold for
the left bank.
The WU-TWC uses a thin-foil (foil thickness 50
m
30
m) metallic substrate for weight reduction
and to improve warm-up performance.
5. Fuel System
Fuel Injector (California Specification Automatic Transaxle Model)
A compact 4-hole type injector has been adopted
to improve the atomization of fuel.

CAMRY ± NEW FEATURES
No.2 INJECTOR
SENSORS ACTUATORS
VG
RSO IGF NE
ECM
IGTI

IGT3
#10
G22
THW
THA
VTA1
STA
SPD
AFR
AFL
OXS
EGLS
THG
KNKR
CF
NSW
A/C
ACIS
FC
ACT
MAFR
HAFL
HREL
#20
#30
#40
#50
#60
MASS AIR FLOW METER
R, 2, L KNKLIGSW
RSC
CRANKSHAFT POSITION SENSOR
Engine Speed Signal
Crankshaft Angle Signal
CAMSHAFT POSITION SENSOR
Crankshaft Angle Signal
ENGINE COOLANT TEMP.
SENSOR
INTAKE AIR TEMP. SENSOR
THROTTLE POSITION SENSOR
Throttle Position Signal
IGNITION SWITCH
Starting Signal
Ignition Signal
VEHICLE SPEED SENSOR
COMBINATION METER
AIR-FUEL RATIO SENSOR
(Bank 1, Sensor 1)
AIR-FUEL RATIO SENSOR
(Bank 2, Sensor 1)
HEATED OXYGEN SENSOR
(Bank 1, Sensor 2)
EGR VALVE POSITION SENSOR
EGR GAS TEMP. SENSOR
KNOCK SENSORS
PARK / NEUTRAL POSITION
SWITCH
Neutral Start Signal
AIR CONDITIONING AMPLIFIER
A / C Switch Signal
COOLING FAN RELAYNo.1 INJECTOR
No.3 INJECTOR
No.4 INJECTOR
No.5 INJECTOR
No.6 INJECTOR
ESA
IGNITER
IGNITION COILS
SPARK PLUGS
IAC
CONTROL VALVE
ACIS
VSV
FUEL PUMP CONTROL
CIRCUIT OPENING RELAY
AIR CONDITIONING CONTROL
AIR CONDITIONING
AMPLIFIER
AIR FUEL RATIO SENSOR
HEATER CONTROL
AIR FUEL RATIO SENSOR
HEATER RELAY
AIR FUEL RATIO SENSOR
HEATER (Bank 1, Sensor 1)
AIR FUEL RATIO SENSOR
HEATER (Bank 1, Sensor 2)SFI
(Continued)
KNOCK SENSORS
11
Construction
1) California Specification Automatic Transaxle Model
The configuration of the engine control system in the 1MZ-FE engine of the '98 Camry is as shown in
the following chart. Shaded portions
differ from the 1MZ-FE engine of the '97 Camry.

CAMRY ± NEW FEATURES
150EG01
Circuit Opening RelayIgnition
SwitchEFI
Main
Relay
DLC1 Pressure
RegulatorVehicle Speed
SensorPark / Neutral Position Switch*
Fuel Pump
BatteryMIL
Air
Conditioning
Amplifier
DLC3
Stop Light Switch
Electrical Load Switch
Air-Fuel Ratio Sensor Heater Relay
ECM Fuel
Filter
Pulsation
DamperVSV
(for EVAP)Vapor
Pressure
Sensor
VSV
for Vapor
Pressure
Sensor
Charcoal CanisterVCV
Intake Air Temp.
SensorIAC Valve
VSV (for EGR)
Mass Air Flow
Meter
Air-Fuel Ratio Sensor
(Bank 1, Sensor 1)Throttle
Position
Sensor
Actuator
DIS
Injector
VSV (for ACIS)
EGR
Valve
Position
Sensor
EGR
Valve EGR Gas
Temp. Sensor Camshaft
Position
Sensor
Engine Coolant
Temp. SensorWU-TWC
WU-TWC
Crankshaft
Position SensorKnock Sensors
Air-Fuel Ratio Sensor
(Bank 2, Sensor 1)Heated Oxygen Sensor
(Bank 1, Sensor 2)
13
Engine Control System Diagram
1) California Specification Automatic Transaxle Model
*: Only for the Automatic Transaxle Models