check engine TOYOTA CAMRY 2000 Service Repair Manual

READINESS MONITOR DRIVE PATTERNS ± EG003-02 RevisedMarch 29, 2002
Page 21 of 23
DRIVE PATTERN NO. 9: Oxygen Sensor Monitor (Front and Rear O2S System)
Once
Twice 3 times 10 times
25 mph
(40 km/h)
(over 900
rpm)
Idling
IG SW off
Over
2 min
(a)Over
50 sec Over
50 sec
(b)50 sec 50 sec Over
40
sec
(c)Over
40
sec40
sec
(d)
Preconditions
The monitor will not run unless:

MIL is OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
a. Start the engine and allow it to idle for 2 minutes or more.
b. Drive the vehicle at 25 mph (40 km/h) or more for at least 50 seconds.
Be sure engine speed remains above 900 rpm.
c. Stop the vehicle and allow the engine to idle for 40 seconds or more.
d. Perform steps ªbº and ªcº ten times.
If readiness status does not switch to ªcomplete,º ensure preconditions are met, turn the
ignition OFF, then repeat steps ªaº through ªd.º
NOTE:
The readiness status may not switch to ªcompleteº after the first drive pattern trip if a
Pending Code has been set (first trip for a two±trip DTC).

Pending Codes are available from the DTC Info Menu in Enhanced OBDII.

Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Once a second trip is completed, a current DTC will be stored. Readiness
Monitor
Drive
Patterns:
Oxygen
Monitors

READINESS MONITOR DRIVE PATTERNS ± EG003-02 RevisedMarch 29, 2002
Page 22 of 23
DRIVE PATTERN NO. 10: Oxygen/Air Fuel Ratio Sensor Monitor
(Front AF Sensor and Rear O2S System)
40 ± 70 mph
(64 ± 112 km/h)
(900 ± 3,200 rpm)
Idling
IG SW offOnce Twice 10 times
Over
2 min
(a)Over
40 sec
(d) 25 mph
(40 km/h)
(over 900 rpm)
Over
3 min
(b)
Over
10 sec
(c)Over
10 sec
(e)Over
40 sec
Over
10 sec40 sec
(f)
Preconditions
The monitor will not run unless:

MIL is OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
a. Start the engine and allow it to idle for 2 minutes or more.
b. Drive the vehicle at 40 ± 70 mph (64 ± 112 km/h) or more for at least 3 minutes.
Be sure to maintain engine speed between 900 and 3,200 rpm.
c. Stop the vehicle and allow the engine to idle for 10 seconds or more.
d. Drive the vehicle at 25 mph (40 km/h) for at least 40 seconds or more.
Be sure to maintain engine speed above 900 rpm.
e. Stop the vehicle and allow the engine to idle for 10 seconds or more.
f. Perform steps ªdº and ªeº ten times.
If readiness status does not switch to ªcomplete,º ensure preconditions are met, turn the
ignition switch OFF, then repeat steps ªaº through ªf.º
NOTE:
The readiness status may not switch to ªcompleteº after the first drive pattern trip if a
Pending Code has been set (first trip for a two±trip DTC).

Pending Codes are available from the DTC Info Menu in Enhanced OBDII.

Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Once a second trip is completed, a current DTC will be stored. Readiness
Monitor
Drive
Patterns:
Oxygen
Monitors
(Continued)

READINESS MONITOR DRIVE PATTERNS ± EG003-02 RevisedMarch 29, 2002
Page 23 of 23
DRIVE PATTERN NO. 11: Oxygen/AF Sensor Heater Monitor
Idling
IG SW off
2 min
(b) 9 min
(a) 25 mph
(40 km/h)
Preconditions
The monitor will not run unless:

MIL is OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
a. Start the engine and allow it to idle for 9 minutes.
b. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes.
If readiness status does not switch to ªcomplete,º ensure preconditions are met, turn the
ignition OFF, then repeat steps ªaº and ªb.º
NOTE:
The readiness status may not switch to ªcompleteº after the first drive pattern trip if a
Pending Code has been set (first trip for a two±trip DTC).

Pending Codes are available from the DTC Info Menu in Enhanced OBDII.

Pending Codes indicate a POTENTIAL problem was detected. A second trip is
needed to confirm the DTC prior to diagnosis.

Once a second trip is completed, a current DTC will be stored. Readiness
Monitor
Drive
Patterns:
Oxygen
Monitors
(Continued)

Toyota Supports ASE CertificationPage 1 of 1
EG003-03Title:
SULFUR ODOR FROM EXHAUST
Models:
All Models
Technical Service
BULLETIN
February 24, 2003

Some owners of Toyota vehicles may experience a sulfur±like or ªrotten eggº odor from
the exhaust system. Sulfur is a natural component of crude oil from which gasoline is
refined and the amount of sulfur can be decreased through the refining process. The
amount of sulfur in fuel sold in California is regulated, however gasoline sold in other
states can have substantially higher sulfur content. Sulfur content also varies
considerably between gasoline brands and locations.
All Models.
A sulfur odor emitted from the vehicle's tailpipe does not necessarily indicate that there is
an issue with the engine's running condition, but is most likely directly related to the fuel.
If the vehicle is exhibiting an excessive sulfur odor, the following checks should be
performed:
If the MIL light is ON, check for DTCs and repair as necessary.
If no trouble is found after performing the above check, recommend the customer try a
different source of fuel.
Replacement of oxygen sensors, air/fuel ratio sensors or catalytic converters will not
reduce the odor and will therefore not
be considered warrantable.
OP CODEDESCRIPTIONTIMEOFPT1T2
N/ANot Applicable to Warranty±±±±
ENGINE
Introduction
Applicable
Vehicles
Repair
Procedure
Warranty
Information

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 2 of 14
Early Type (Non±Intrusive) EVAP System Overview
There are a variety of EVAP systems in use with different monitoring strategies. It is
essential that the EVAP system be correctly identified before beginning diagnosis. The
Repair Manual is the best source for this information. The following information covers
the different systems.
The first system described is the Early Type (Non±Intrusive) EVAP System. Refer to the
Applicable Vehicles chart for applicability information.
Onboard Recovery Valve
(Fill Check Valve)Vapor
Pressure
SensorVapor
Pressure
Sensor
Three Way
VSVVacuum
Check
ValveTank Valve
AssemblyPressure
ValveCanister
To
Manifold
Vacuum
Purge
Valve
Filtered
Air
Air Drain Valve
Air Valve AssemblyAir Inlet ValveAir Inlet LineService
Port
Purge Operation
When the engine has reached
predetermined parameters (closed loop,
engine temp. above 125
F, etc.), stored
fuel vapors are purged from the canister
whenever the purge VSV is opened by
the ECM. At the appropriate time, the
ECM will turn on the purge VSV.
The ECM will change the duty ratio cycle
of the purge VSV thus controlling purge
flow volume. Purge flow volume is
determined by manifold pressure and the
duty ratio cycle of the purge VSV.
Atmospheric pressure is allowed into the
canister to ensure that purge flow is
constantly maintained whenever purge
vacuum is applied to the canister (see
Figure 1).
Early Type
System
Description
Figure 1. Purge OperationFresh Air Inlet
Purge VSV

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 7 of 14
ECHO Monitor Sequence
CCV Open
Purge
ClosedOpenClosed
Purge ClosedOpen Open
Cold Start ECT/IAT
Near Same TempNegative
Pressure
(Vacuum)
OccursTank &
Canister
Leak CheckCCV
Testing Vapor
Pressure
Sensor
Signal
Monitor Operation
The monitor sequence begins with a cold
engine start. The IAT and ECT sensors
must have approximately the same
temperature reading.
The ECM is constantly monitoring fuel
tank pressure. As the temperature of the
fuel increases, pressure slowly rises.
The ECM will purge the charcoal canister
at the appropriate time (see Figure 1).
With bypass VSV closed, pressure will
continue to rise in fuel tank.
Late Type
System
Monitor
Sequence
(Continued)
Except ECHO
Figure 1. Canister Purge
ECHO
Figure 1. Canister Purge

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 11 of 14
Diagnostic Process Flow Chart
(Continued on following page)
PRELIMINARY CHECK
Fuel level should be between
1/4 and 3/4
Visually inspect for presence
of Fuel/Gas Cap
DO NOT TIGHTEN OR REMOVE!
PRESSURIZE EVAP SYSTEM (System Integrity Check)
This test checks for leaks in the canister and fuel tank sides. The CCV and Air Inlet Lines will be checked
separately.
A) Clamp the air drain hose on the charcoal canister with the supplied hose pliers from the EVAP System
Pressure Test Kit.
B) Locate the vapor pressure sensor. If the vapor pressure sensor has two hoses connected to it,
disconnect the hose between the air drain hose fitting at the vapor pressure sensor and plug the hose.
C) Connect the pressure supply hose from the Pressure Test Kit to the Green EVAP System Service Port
located on the EVAP Purge VSV line in the engine compartment.
D) Using the directions on the inside of the EVAP System Pressure Test Kit lid, pressurize the EVAP
system. Once pressurized, turn off the pump and seal the system (Pressure Hold Switch to ªClosedº
and Vent Switch to ªClosed).
E) After 30 seconds, note the pump pressure gauge reading and the Scan Tool vapor pressure
sensor reading.
F) Compare the readings to one of the four conditions listed below and proceed as directed.
DO NOT PROCEED! NG
OK
SCAN TOOL SETUP
A) Connect Scan Tool to DLC3 on vehicle.
B) Go to the SETUP menu and select UNIT CONVERSION.
C) Under VAPOR PRESSURE, Select ABS for absolute pressure, and mmHg for millimeters of mercury.
This is to match the Repair Manual specifications.
D) Go back to FUNCTION SELECT menu and select ENHANCED OBD II.
E) Select NORMAL MODE. Then select CURRENT DATA and USER SELECT.
F) Using the arrow key, select VAPOR PRESS from the DATA LIST and select YES.
G) Press ENTER. You will now be able to monitor the Vapor Pressure Sensor reading.
START
If vehicle is ECHO, go directly to ªECHO Canister and Tank Leak Checkº on page 14.
If vehicle is not ECHO, follow the flow chart below.
Diagnostic
Tips for Late
Type EVAP
System
(Continued)

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 13 of 14
Disconnect
EVAP Hose Here
A. Using the supplied brass step±down adapter, disconnect the EVAP hose from
the charcoal canister side as indicated above. Connect Pressure Supply hose
from Pressure Test Kit to the EVAP hose and pressurize the fuel tank to
30 mmHg (4 kPa / 0.58 psi).
B. Check that the internal pressure of the tank will hold for 1 minute. Check shaded
areas for leaks (soapy water can be used for leak detection). If pressure holds, then
perform the Canister Leak Check.
C. When done, reconnect the EVAP line hose to the charcoal canister. Fuel Tank Leak Check (Except ECHO)
Canister Leak Check (Except ECHO)
A. Connect the Pressure Supply hose from the Pressure Test Kit to the Green EVAP
System Service Port located on the EVAP Purge VSV line in the engine compartment.
B. Using the directions on the inside of the EVAP System Pressure Test Kit lid,
pressurize the EVAP system. Once pressurized, turn off the pump and seal the system
(Pressure Hold Switch to ªClosedº and Vent Switch to ªClosedº)
C. With system pressurized at EVAP Service Port, check shaded areas for leaks (soapy
water can be used for leak detection). Diagnostic
Tips for Late
Type EVAP
System
(Continued)

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 14 of 14
ECHO Canister and Tank Leak Check
A. Connect the Pressure Supply hose from the Pressure Test Kit to the Green EVAP
System Service Port located on the EVAP Purge VSV line in the engine
compartment.
B. Using the directions on the inside of the EVAP System Pressure Test Kit lid,
pressurize the EVAP system. Once pressurized, turn off the pump and seal the
system (Pressure Hold Switch to ªClosedº and Vent Switch to ªClosedº)
C. With system pressurized, check shaded areas for leaks (soapy water can be used
for leak detection).
Return Vehicle to Service
A. After performing checks and/or repairs, be sure to reconnect all lines and verify
that all plugs and hose pliers used for diagnosis have been removed.
B. For additional diagnostic procedures and information, refer to the appropriate
Repair Manual. Diagnostic
Tips for Late
Type EVAP
System
(Continued)

M.I.L. ªONº P0440, P0441 & P0446 ± EG013-02July 12, 2002
Page 2 of 5
Test VSV Operation Using ACTIVE TEST on the Toyota Diagnostic Tester
1. Test operation of the Vapor Pressure Sensor VSV using the Toyota Diagnostic Tester
in ACTIVE TEST (see screen flow in Figure 1).
INJECTOR 0.0ms
IGN ADVANCE 5.0deg
CALC LOAD 0%
MAF 0gm/s
ENGINE SPD 0rpm
COOLANT TEMP 77.0F
INTAKE AIR 87.8F
THROTTLE POS 16%
CTP SW ON
VEHICLE SPD 0MPH
02S B1 S1 0.00V
2: CUSTOMIZE
3: ECU REPROGRAMFUNCTION SELECT FOR
NORTH AMERICA
B
*APPLICATION SELECT*
A
1: DIAGNOSISDIAGNOSTIC MENU
ENGINE
C
PRESS INJ VOL
A/F CONTROL
FUEL PMP SP CTL
A/C CUT SIG
CAN CTRL VSV
EVAP VSV (ALONE)
FUEL PUMP/SPD
LINE PRESS UPSELECT DATA
E
SELECT DATA
D
TANK BYPASS VSVUSER DATA
[ENTER]
F
G
TANK BYPASS VSV OFF
1: OBD/MOBD
3: CARB OBD II
4: BREAK±OUT BOX
5: NVH
6: AUTOPROBE
7: 02 RPM CHECK
8: SNAPSHOT REVIEW
9: SETUP
0: GAS ANALYSIS2: ENHANCED OBD1: DATA LIST
2: DTC INFO
4: SNAPSHOT
5: SYSTEM CHECK
6: RESET MEMORY
7: MONITOR STATUS
8: CHECK MODE
3: ACTIVE TEST
ALL
INJECTOR 0.0ms
IGN ADVANCE 5.0deg
CALC LOAD 0%
MAF 0gm/s
ENGINE SPD 0rpm
COOLANT TEMP 77.0F
INTAKE AIR 87.8F
THROTTLE POS 16%
CTP SW ON
VEHICLE SPD 0MPH
02S B1 S1 0.00V Figure 1: Testing Operation of Vapor Pressure Sensor VSV using ACTIVE TEST
TANK BYPASS VSV ON
NOTE:
Vapor Pressure Sensor VSV is listed as TANK BYPASS VSV on the Diagnostic Tester. Inspection &
Repair
Procedure