2000 TOYOTA CAMRY Service Repair Manual

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Page 4561 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 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 strategi

Page 4562 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 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 int

Page 4563 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 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
�Inappr

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

Page 4564 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 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
Val

Page 4565 of 4770

TOYOTA CAMRY 2000 Service Repair Manual EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 6 of 14
ECHO Late Type (Intrusive EVAP System)
The ECHO uses a Late Type EVAP System but is configured with some small
differences. Fo

Page 4566 of 4770

TOYOTA CAMRY 2000 Service Repair Manual 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

Page 4567 of 4770

TOYOTA CAMRY 2000 Service Repair Manual EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 8 of 14
Purge VSV Operation ± P0441
At a predetermined point, the ECM closes
the CCV and opens the bypass VSV
causing vacuum to incre

Page 4568 of 4770

TOYOTA CAMRY 2000 Service Repair Manual EVAP SYSTEM OPERATION INFORMATION ± EG005-01 April 27, 2001
Page 9 of 14
Vent Control, CCV Operation P0446
This stage checks the CCV and vent (air
inlet side) operation. When the vapor
pressure rises

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