2000 TOYOTA CAMRY Fuel line

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 3 of 14
ORVR Operation
During refueling, low pressure above the
diaphragm in the onboard recovery valve
lifts allowing fuel vapors into the charcoal
canister. At the same time, the air drain
valve opens and the charcoal absorbs the
fuel vapors (see Figure 2).
Early Type (Non±Intrusive) EVAP System DTCs
EVAP Monitor Leak Operation P0440
The ECM tests for leaks by measuring
EVAP system pressure in the lines,
charcoal canister, and fuel tank. When
the EVAP pressure is higher or lower than
atmospheric pressure, the ECM
concludes that no leaks are present.
EVAP pressure is measured by the vapor
pressure sensor. If either the tank or
canister purge side is at atmospheric
pressure under specific conditions, the
ECM determines there is a leak.
If DTC P0440 is present, the leak is on
the fuel tank side of the EVAP system.
This also includes the lines between the
fuel tank and part of the canister. When
the Vapor Pressure sensor is measuring
tank pressure, the ECM is observing
changes in pressure and comparing tank
pressure to atmospheric pressure. No
difference in pressure indicates a leak.
The ECM may take 20 minutes or more to
complete testing the fuel tank side (see
Figure 3).
Canister Leak Detection P0446
When the ECM switches the vapor
pressure VSV to canister side, the ECM
measures canister pressure. A leak on
the canister side can set multiple DTCs
(see Figure 4).Early Type
System
Description
(Continued)
Figure 2. ORVR Operation
Figure 3. Fuel Tank Side of System
Figure 4. Canister Side of System

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 4 of 14
Vapor Purge Flow P0441
The EVAP monitor is designed to detect:
Restricted vapor purge flow when the
purge VSV is open
Inappropriate vapor purge flow when
the purge VSV is closed
Under normal purge conditions, pressure
pulsations generated by the cycling of the
purge VSV are present in the canister
and detected by the Vapor Pressure
sensor.
Three±Way VSV P0446
The three±way VSV is connected to the Vapor Pressure sensor, canister, and fuel tank.
This VSV allows the Vapor Pressure sensor to detect either canister or tank pressure.
There are two modes the ECM can use to determine if the three±way VSV is
malfunctioning. The three±way VSV is judged to be normal if there is pressure difference
between the tank and canister when the three±way VSV is switched to look at the
charcoal canister and fuel tank side of system.
If there isn't any pressure difference between the fuel tank and canister, the ECM looks
for the following conditions:
During purging, pressure pulsations generated by the purge VSV are not present in
the canister as detected by Vapor Pressure sensor, the three±way VSV is judged to
be defective.
If there are pressure pulsations detected by the Vapor Pressure sensor present in the
fuel tank, the three±way VSV is judged to be defective.
Late Type (Intrusive) EVAP System Overview
The Late Type EVAP System, also known as the Intrusive type, was developed to meet
the very stringent, mandated standard of detecting a hole 0.020 inch (0.5 mm). This
system uses many of the same components as the early type EVAP system. Purge,
vacuum relief, pressure relief, and ORVR operations are identical to the early type. Refer
to the Applicable Vehicles chart for applicability information.
The following changes were made to the Late Type EVAP System:
Vapor pressure sensor connected to the fuel tank.
Bypass VSV in the place of the three way VSV.
Canister Closed Valve (CCV) on the air inlet line.Early Type
System
Description
(Continued)
Figure 5. Flow During Purge Operation
Late Type
System
Description

EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 5 of 14
Late Type (Intrusive EVAP System) (Except ECHO)
Onboard Recovery Valve
(Fill Check Valve)Vapor
Pressure
SensorVacuum
Check
ValveTank Valve
AssemblyTank
Pressure
Valve
Canister
To
Manifold
Vacuum
Purge
VSV
Filtered
Air
Air Drain Valve
Air Valve AssemblyAir Inlet ValveCanister
Closed Valve
Bypass
VSVAir
Inlet LineService
Port
Tank Side
The bypass VSV and the fill check valve
assembly isolates the tank pressure side
from the canister side (see Figure 1).
Canister Side
The bypass VSV and the Fill Check valve
also isolate the canister side from the
tank side (see Figure 2).
Late Type
System
Description
(Continued)
Except ECHO
Figure 1. Fuel Tank Side of System
Except ECHO
Figure 2. Canister Side of System

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 12 of 14
Pump pressure
gauge and vapor
pressure above
atmospheric
pressure (above 762
mmHg). No leak in
canister or tank.Pump pressure
gauge zero, vapor
pressure above
atmospheric
pressure (above 762
mmHg). Leak is on
canister side of
system.Pump pressure
gauge is above
atmospheric
pressure (above
zero), vapor
pressure is at
762 mmHg. Leak is
on the fuel tank side
of system.Pump pressure
gauge at zero,
vapor pressure is
at 762 mmHg. The
leak(s) is/are on the
canister and tank
sides or a leak at a
point common to
both sides of system.
Remove hose pliers
from the air drain
hose on the charcoal
canister before
proceeding with
additional checks.Remove hose pliers
from the air drain
hose on the charcoal
canister before
proceeding with
additional checks.Remove hose pliers
from the air drain
hose on the charcoal
canister before
proceeding with
additional checks.
Go to CCV/Air Inlet
Line Check.Go to ªCanister Leak
Check.º Diagram on
page 13.Go to ªFuel Tank
Leak Check.º
Diagram on page 13.Go to ªFuel Tank
Leak Check.º
Diagram on page 13.
Remove hose pliers
from the air drain
hose on the charcoal
canister before
proceeding with
additional checks.
Go to ªReturn Vehicle to Serviceº on page 14.
CCV and Air Inlet Line Check. (Except ECHO)
A) Disconnect the air inlet line from the charcoal canister.
B) Using the supplied step±down brass adapter (or equivalent) connect the Pressure Supply Hose to
the air inlet line.
C) Using the Scan Tool Active Test, turn on the CCV. This will close the CCV.
D) Pressurize the line. Once pressurized, turn off the pump and seal the line (Pressure Hold Switch to
ªClosedº and Vent Switch to ªClosedº). Pressure should hold. If not, check CCV and connections.
E) Next, using the Scan Tool, turn off the CCV. This will open the CCV. The pressure should decrease.
If not, check the CCV and connections.
F) After completing the test, reconnect air inlet line to charcoal canister. Diagnostic Process Flow Chart (Continued)
(Continued from previous page)
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)