2000 TOYOTA CAMRY Service Repair Manual

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Page 401 of 4770

TOYOTA CAMRY 2000 Service Repair Manual CIRCUIT DESCRIPTION
The signal from the A/T CPU retards the ignition timing of the engine during A/T shifting, thus
momentarily reducing torque output of the engine for smooth clutch operation inside

Page 402 of 4770

TOYOTA CAMRY 2000 Service Repair Manual CIRCUIT DESCRIPTION
To obtain a high purification rate for the C0, HC and NOx components of the exhaust gas, a three±
way catalytic converter is used, but for most efficient use of the three±way cat

CIRCUIT DESCRIPTION
To obtain a high purification rate for the C0, HC and NOx components of the exhaust gas, a three±
way catalytic converter is used, but for most efficient use of the three±way catalytic converter, the
air±fuel ratio must be precisely controlled so that it is always close to the stoichiometric air±fuel ra-
tio. The oxygen sensor has the characteristic whereby its output voltage changes suddenly in the
vicinity of the stoichiometric air±fuel ratio. This characteristic is used to detect the oxygen con-
centration in the exhaust gas and provide feedback to the computer for control of the air±fuel ratio.
When the air±fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the
oxygen sensor informs the ECM of the LEAN condition (small electromotive force; 0 V).
When the air±fuel ratio is RICHER than the stoichiometric air±fuel ratio the oxygen concentration in
the exhaust gas is reduced and the oxygen sensor informs the ECM of the RICH condition (large
electromotive force: 1 V). The ECM judges by the electromotive force from the oxygen sensor
whether the air±fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if
malfunction of the oxygen sensor causes output of abnormal electromotive force, the ECM is un-
able to perform accurate air±fuel ratio control.
Main oxygen sensor signal voltage is reduced to
between 0.35 V and 0.70 V for 60 sec. under
conditions (a) ± (d).
(2 trip detection logic) *
(a) Engine coolant temp. : 80C (176F) or more.
(b) Engine speed : 1,500 rpm or more.
(c) Load driving (EX. A/T in overdrive (5th for
M/T), A/C ON, Flat road, 50 mph (80km/h)).
(d) Main oxygen sensor signal voltage :
Alternating above and below 0.45 V.Diagnostic Trouble Code Detecting Condition
wMain oxygen sensor circuit.
wMain oxygen sensor.
*See page EG1±307Trouble Area
DTC 21 Main Oxygen Sensor Circuit
DTC No.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±352

Page 403 of 4770

TOYOTA CAMRY 2000 Service Repair Manual Disconnect the EFI fuse (15A) for 10 sec. or more, with IG switch OFF.
Initiate test mode (Connect terminal TE2 and E1 of data link connector 1 or 2 with IG switch
OFF).
Start the engine and warm up

Page 404 of 4770

TOYOTA CAMRY 2000 Service Repair Manual Are there any other codes (besides code 21)
being output ?Go to relevant diagnostic trouble code
chart.
DIAGNOSTIC CHART
WIRING DIAGRAM
Replace main oxygen sensor.YES
± 5S±FE ENGINECIRCUIT INSPECTIO

Page 405 of 4770

TOYOTA CAMRY 2000 Service Repair Manual wWith the engine racing (4,000 rpm) measure wave±
form between terminals OX1 and E1 of engine con±
trol module.
HINT: The correct waveform appears as shown in the
illustration on the left, oscillati

Page 406 of 4770

TOYOTA CAMRY 2000 Service Repair Manual CIRCUIT DESCRIPTION
The engine coolant temperature sensor senses the
engine coolant temperature. A thermistor built in the
sensor changes its resistance value according to the
engine coolant temperatu

Page 407 of 4770

TOYOTA CAMRY 2000 Service Repair Manual DIAGNOSTIC CHART
HINT If diagnostic trouble codes ª22º (engine coolant temperature sensor circuit), ª24º (intake air temperature sensor cir-
cuit), ª31º (manifold absolute pressure sensor circui

Page 408 of 4770

TOYOTA CAMRY 2000 Service Repair Manual INSPECTION PROCEDURE
HINT: If diagnostic trouble codes ª22º (engine coolant temperature sensor circuit), ª24º (intake air
temperature sensor circuit), ª31º (manifold absolute pressure sensor cir

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