2000 TOYOTA CAMRY sensor

WIRING DIAGRAM
Refer to page EG1±354 for the WIRING DIAGRAM.
Does malfunction disappear when a good main
oxygen sensor is installed?Check each item found to be a possible cause
of problem.
Does malfunction disappear when a good main
oxygen sensor is installed?Check each item found to be a possible cause
of problem.Check for open and short in harness and
connector.Repair or replace harness or
connector.
DIAGNOSTIC CHART
Check voltage of terminal OX1.Check voltage of terminal VF1.
Replace main oxygen sensor.
Replace main oxygen sensor. Check and replace ECM.
Check and replace ECM.Check compression.
Check compression.Repair or replace.
Repair or replace.Repair or replace.
Repair or replace.N G TypeII
NG Type I
YESYES
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±365

(1) Warm up engine at normal operating tem±
perature.
(2) Connect terminals TE1 and E1 of data link
connector 1.
(3) Connect positive prove to terminal VF1 and
negative prove to terminal E1 of data link
connector 1.
(1) Warm up the oxygen sensor by running en±
gine at 2,500 rpm for about 2 minutes.
(2) Then, maintaining engine at 2,500 rpm,
count how many times needle of voltmeter
fluctuates between 0 and 5 V.
Warm up engine at normal operating temperature.
Measure voltage between terminals OX1 and E1
of data link connector 1 when engine is suddenly
raced to full throttle.
The voltage should be 0.5 V or higher at least
once.
Perform inspection within 1 second.
Check voltage between terminals OX1 and E1 of data link connector 1.
Check voltage between terminals VF1 and E1 of data link connector 1.
Needle fluctuates of 8 times or more
for every ten seconds
INSPECTION PROCEDURE
Continue at 0 V
Continue at 5 V
NG
Type II
Go to stepGo to step NG
Type
ING Type II
NG Type II Result
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±366

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

CIRCUIT DESCRIPTION
The sub oxygen sensor is installed on the exhaust pipe. Its construction and operation is the same as
the main oxygen sensor on page EG1±352.
Main oxygen sensor signal is 0.45 V or more
and sub oxygen sensor signal is 0.45 V or less
under conditions (a) and (b).
(2 trip detection logic) *
(a) Engine coolant temp. : 80
C (1 76
F) or more.
(b) Accel. pedal : Fully depressed for 2 sec. or more.wOpen or short in sub oxygen sensor circuit.
wSub oxygen sensor
wECM Diagnostic Trouble Code Detecting Condition
* : See page EG1±307.
Trouble Area
DTC 27 Sub Oxygen Sensor Circuit
DTC No.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±369

Disconnect the E F I fuse (15 A) for 10 sec. or more, with IG switch OFF.
Initiate test mode (Connect terminals TE2 and E1 of data link connector 1 or 2
with I G switch OFF).
Start the engine and warm up, with all ACC switch OFF.
After the engine is warmed up, let it drive at 50 ~ 55 mph (80 ~ 88 km/h)
for 10 min. or more.
After driving, stop at a safe place and perform idling for 2 min. or less.
After performing the idling in (4) , perform acceleration to 60 mph (96 km/h)
with the throttle valve fully open.
HINT: If a malfunction exists, the malfunction indicator lamp will light up during
step.
NOTICE: If the conditions in this test are not strictly followed, detection of the
malfunction will not be possible.
CIRCUIT DESCRIPTION (Cont'd)
DIAGNOSIS TROUBLE CODE DETECTION DRIVING PATTERN
Purpose of the driving pattern.
(a) To simulate diagnostic trouble code detecting condition after diagnostic trouble code is
recorded.
(b) To check that the malfunction is corrected when the repair is completed confirming that diagnos±
tic trouble code is no longer detected.
Malfunction: Open or Short in Sub Oxygen Sensor
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±370

Are there any other codes (beside Code 27)
being output?Go to relevant diagnostic trouble
code chart.
DIAGNOSTIC CHART
WIRING DIAGRAM
Replace sub oxygen sensor.YES
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±371

CIRCUIT DESCRIPTION
By a built±in sensor unit, the manifold absolute
pressure sensor detects the intake manifold absolute
pressure as a voltage.
The ECM then determines the basic injection dura±
tion and basic ignition advance angle based on this
voltage.
Since the manifold absolute pressure sensor does
not use the atmospheric pressure as a criterion, but
senses the absolute pressure inside the intake man±
ifold (the pressure in proportion to the preset abso±
lute vacuum O), it is not influenced by fluctuations
in the atmospheric, pressure due to high altitude
and other factors. This permits it to control the air±
fuel ratio at the proper level under all conditions.
If the ECM detect diagnostic trouble code ª31 ª, it operates the fail safe function, keeping the ignition
timing and fuel injection volume constant and making it possible to drive the vehicle.w
Open or short in manifold absolute pressure
sensor circuit.
wManifold absolute pressure sensor.
wECM Open or short in manifold absolute pressure sensor
circuit for 0.5 sec. or more.Diagnostic Trouble Code Detecting Condition Trouble Area
DTC 31 Manifold Absolute Pressure Sensor Circuit
DTC No.
± 5S±FE ENGINECIRCUIT INSPECTIONEG1±372