2000 TOYOTA CAMRY sensor

2. INSPECT EGR GAS TEMPERATURE SENSOR
Using an ohmmeter, measure the resistance between
the terminals.
Resistance:
64±97 k
at 50
C (122
F)
11±16 k
at 100
C (212
F)
2±4 k
at 150
C (302
F)
If the resistance is not as specified, replace the
sensor.
EGR GAS TEMPERATURE SENSOR
INSPECTION
1. REMOVE EGR GAS TEMPERATURE SENSOR
EGR GAS TEMPERATURE SENSOR
3. REINSTALL EGR GAS TEMPERATURE SENSOR
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±230

OXYGEN SENSOR
OXYGEN SENSOR INSPECTION
1. WARM UP ENGINE
Allow the engine to warm up to normal operating
temperature.
2. INSPECT FEEDBACK VOLTAGE
Connect the positive (+) probe of a voltmeter to
terminal VF1 of the data link connector 1 and nega±
tive (±) probe to terminal E1. Perform the test as
follows:
Using SST, connect terminals TE1 and E1 of the data link
connector 1.
SST 09843±18020
And maintain engine speed at 2,500 rpm.
Warm up the oxygen sensor with the engine at 2,500 rpm
for approx. 90 seconds. And maintain engine speed at
2,500 rpm.Warm up the oxygen sensor with the engine at 2,500 rpm
for approx. 90 seconds.
CONTINUED ON PAGE EG1±232
Disconnect terminals TE1 and E1 of the data link
connector 1. And maintain engine speed at 2,500 rpm. Check the number of times the voltmeter needle fluctuates
in 10 seconds.Zero again After replacing
1 the oxygen sensor
Check the number of times the voltmeter needle fluctuates in 10 seconds.
Read and record diagnostic trouble codes. (See page EG1±297)
Malfunction code(s)
(Ex. code Nos. 21, 25 and 26) Measure voltage between terminals VF1 and E1.
Repair the relevant diagnostic trouble code.
Normal code, code
Nos. 21, 25 and 26Replace the ECM.
Less than 8 timesLess than 8 times
8 times or more
More than 0 V8 times
or more
NormalZero
Zero
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±231

Disconnect the engine coolant temp. sensor connector and
connect resistor with a resistance of 4 ± 8 k

or send an
equivalent simulation signal.
Warm up the oxygen sensor with the engine at 2,500 rpm for
approx. 90 seconds. And maintain engine at 2,500 rpm.Disconnect terminals TE1 and E1 of the data link connector 1.
And maintain engine at 2,500 rpm.
CONTINUED FROM PAGE EG1±231
Read and record diagnostic trouble codes. (See page
EG1±297)
Connect terminals TE1 and E1 of the data link connector 1.Malfunction code(s)
(Ex. code Nos. 21, 25 and 26)
Measure voltage between terminals VF1 and E1.
Measure voltage between terminals VF1 and E1, Measure voltage between terminals VF1 and E1.Repair the relevant diagnostic trouble code.
Normal code, code Nos.
21, 25 and 26
Replace the oxygen sensor. Disconnect the PCV hose.
Repair (Over Lean) Repair (Over rich)More than 0 V
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±232

SUB OXYGEN SENSOR
SUB OXYGEN SENSOR INSPECTION
INSPECT SUB OXYGEN SENSOR
HINT: Inspect only when code No. 27 is displayed.
(a) Cancel the diagnostic trouble code. (See page EG1±299)
(b) Warm up the engine until it reaches normal operating
temperature.
(c) M/T:
Drive for 5 minutes or more at a speed less than 80
km/h (50 mph) in 4th or 5th gear.
A/T:
Drive for 5 minutes or more at a speed less than 80
km/h (50 mph) in ªDº position.
(d) Following the conditions in step (c), fully depress on
the accelerator pedal for 2 seconds or more.
(e) Stop the vehicle and turn the ignition switch OFF.
(f) Carry out steps (b), (c) and (d) again to test accelera±
tion. If code No.27 appears again, check the sub oxygen
sensor circuit. If the circuit is normal, replace the sub
oxygen sensor.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±233

Clearance between stop screw and lever
0 mm (0 in.)
0.50 mm (0.020 in.)
0.70 mm (0.028 in.)
Throttle valve fully open
SERVICE SPECIFICATIONS
SERVICE DATA
Resistance
Injection volume
Difference between each cylinder
Fuel leakage
Throttle body fully closed angle
Throttle opener setting speed
VSV for Fuel
pressure
(California
only)
EG R gas
temperature
sensorResistance (+B ± ISCC or ISCO) Throttle
position
sensor Fuel pressure
regulator
A/C idle ±up
valvePower source voltage
Fuel return rpm Fuel pressure
Throttle body
Fuel cut rpm VSV for EG Rat no vacuum
MAP sensor Fuel pump
IAT sensorECT sensor
Resistance Resistance
Resistance
Resistance Resistance
Resistance Resistance IAC valve Injector
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±236

HOW TO PROCEED WITH TROUBLESHOOTING
The Engine Control System broadly consists of the sensors, Engine Control Module (ECM) and actuators.
The ECM receives signals from various sensors, judges the operating conditions and determines the
optimum injection duration, timing, ignition timing and idle speed.
In general, the Engine Control System is considered to be a very intricate system to troubleshoot. But, the
fact is that if you proceed to inspect the circuit one by one following the procedures directed in this manu-
al, troubleshooting of this system is not complex.
This section explains the most ideal method of troubleshooting and tells how to carry out the necessary
repairs.
1. CUSTOMER PROBLEM ANALYSIS
Using the customer problem analysis check sheet for reference, ask the customer in as much details
as possible about the problem.
2. CHECK AND CLEAR DIAGNOSTIC TROUBLE CODE (PRECHECK)
Before confirming the problem symptom, first check the diagnostic trouble code and make a note of
any malfunction code which is output, then clear the code.
HINT: Output of the malfunction code indicates that there is a malfunction in the circuit indicated.
However, it does not indicate whether the malfunction is still occurring or occurred in the past and
returned to normal. In order to determine this, the problem sym toms should be confirmed in step 4
first and the diagnostic trouble code be rechecked in step [6].
Accordingly, if troubleshooting is begun based on the malfunction code only in diagnostic trouble
code check in step [2], it could result in a misdiagnosis, leading to troubleshooting of circuits which
are normal and making it more difficult to locate the cause of the problem.
3. SETTING THE TEST MODE DIAGNOSIS, [4] PROBLEM SYMPTOM CONFIRMATION,
[5] SYMPTOM SIMULATION
In order to find out the trouble more quickly, set the diagnosis check in test mode and with higher
sensing ability of the ECM, confirm the problem symptoms. If the trouble does not reappear, use the
symptom simulation method to make sure the trouble is reproduced.
6. DIAGNOSTIC TROUBLE CODE CHECK IN TEST MODE
Check the diagnostic trouble code in test mode. If the malfunction code is output, proceed to step. If the
normal code is output, proceed to step [7].
7. BASIC INSPECTION
Carry out basic inspection such as the spark check and fuel pressure check, etc.
8. DIAGNOSTIC TROUBLE CODE CHART
If the malfunction code is displayed, proceed to inspect the circuit indicated by the chart for each
code.
9. MATRIX CHART OF PROBLEM SYMPTOMS
If the normal code is displayed in the diagnosis in test mode, perform troubleshooting according to
the inspection order in the Matrix Chart of Problem Symptoms.
10. PARTS INSPECTION
When the Matrix Chart of Problem Symptoms instructs to check the parts, proceed to parts inspection
section included in this manual.
11. CIRCUIT INSPECTION
Determine if the malfunction is the sensor, actuator, wire harness, connector or the ECM.
± 5S±FE ENGINEHOW TO PROCEED WITH TROUBLESHOOTINGEG1±292

DIAGNOSIS SYSTEM
DESCRIPTION
The ECM contains a built±in self±diagnosis system by which
troubles with the engine signal network are detected and a
Malfunction indicator lamp on the instrument panel lights up.
By analyzing various signals as shown in the later table (See
page EG1±300) the Engine Control Module (ECM) detects
system malfunctions relating to the sensors or actuators.
In the normal mode, the self±diagnosis system monitors 14
items, indicated by code No. as shown in EG1±300. A mal-
function indicator lamp informs the driver that a malfunction
has been detected. The light goes off automatically when the
malfunction has been repaired. But the diagnostic trouble
code(s) remains stored in the ECM memory (except for code
Nos. 16). The ECM stores the code(s) until it is cleared by
removing the EFI fuse with the ignition switch off.
The diagnostic trouble code can be read by the number of
blinks of the malfunction indicator lamp when TE1 and E1
terminals on the data link connector 1 or 2 are connected.
When 2 or more codes are indicated, the lowest number
(code) will appear first.
In the test mode, 9 items, indicated by code No. as shown in
EG1±300 are monitored. If a malfunction is detected in any
one of the systems indicated by code Nos. 13, 22, 24, 25, 26,
27, 31, 41 and 71 the ECM lights the malfunction indicator
lamp to warn the technician that malfunction has been de-
tected. In this case, TE2 and E1 terminals on the data link
connector 1 or 2 should be connected as shown later. (See
page EG1±298).
In the test mode, even if the malfunction is corrected, the
malfunction code is stored in the ECM memory even when
the ignition switch is off (except code Nos. 43 and 51). This
also applies in the normal mode. The diagnostic mode (nor-
mal or test) and the output of the malfunction indicator lamp
can be selected by connecting the TE1, TE2 and E1 termi-
nals on the data link connector 1 or 2, as shown later.
A test mode function has been added to the functions of the
self±diagnostic system of the normal mode for the purpose of
detecting malfunctions such as poor contact, which are diffi-
cult to detect in the normal mode. This function fills up the
self±diagnosis system. The test mode can be implemented
by the technician following the appropriate procedures of
check terminal connection and operation described later.
(See page
EG1±298)
± 5S±FE ENGINEDIAGNOSIS SYSTEMEG1±296

Diagnosis Inspection (Test Mode)
Compared to the normal mode, the test mode has high sens±
ing ability to detect malfunctions.
It can also detect malfunctions in the starter signal circuit, the
IDL contact signal of the throttle position sensor, air condi±
tioning signal and Park/Neutral Position switch signal.
Furthermore, the same diagnostic items which are detected in
the normal mode can also be detected in the test mode.
DIAGNOSTIC TROUBLE CODE CHECK
1. Initial conditions.
(a) Battery voltage 11 V or more.
(b) Throttle valve fully closed.
(c) Transmission in neutral position.
(d) Air conditioning switched off.
2. Turn ignition switch off.
3. Using SST, connect terminals TE2 and E1 of data link
connector 1 or 2.
SST 09843±18020
4. Turn ignition switch on.
HINT:
wTo confirm that the test mode is operating, check that
the malfunction indicator lamp flashes when the igni±
tion switch is turned to ON.
wIf the malfunction indicator lamp does not flash, pro±
ceed to troubleshooting of the TE2 terminal circuit on
page EG1±430.
5. Start the engine.
6. Simulate the conditions of the malfunction described by
the customer.
7. After the road test, using SST, connect terminals TE1 and
E1 of data link connector 1 or 2.
SST 09843±18020
8. Read the diagnostic trouble code on malfunction indica±
tor lamp on the combination meter (See page EG1±297).
9. After completing the check, disconnect terminals TE1,
TE2 and E1, and turn off the display.
HINT:
wThe test mode will not start if terminals TE2 and E1 are
connected after the ignition switch is turned on.
wWhen vehicle speed is 3 mph (5 km/h) or below,
diagnostic trouble code ª42º (Vehicle speed signal) is
output, but this is not abnormal.
wWhen the engine is not cranked, diagnostic trouble
code ª43º (Starter signal) output, but this is not ab±
normal.
wWhen the automatic transmission shift lever is in the
ªDº, ª2º, ªLº or ªRº shift position, or when the air
conditioning is on or when the accelerator pedal is
depressed, code ª51º (Switch condition signal) is
output, but this is not abnormal.
± 5S±FE ENGINE DIAGNOSIS SYSTEMEG1±298