Lexus ES300 (2002 year). Manual — part 369
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-95
248
REPLACE FUEL TANK CAP ASSY
6
INSPECT FUEL TANK INLET PIPE SUB-ASSY
(a)
Remove the fuel tank cap.
(b)
Visually inspect the fuel inlet pipe for damage.
NG
REPLACE FUEL TANK INLET PIPE SUB-ASSY
(1)
Replace to fuel tank inlet pipe sub-assy.
(2)
After replace, perform ”EVAP SYS CHECK” by
hand-held tester. (Go to step 2.)
OK
REPAIR OR REPLACE VACUUM HOSES(VAPOR PRESSURE SENSOR - FUEL TANK, FUEL TANK
- VSV FOR PRESSURE SWITCHING VALVE)
(c)
Repair or replace to fuel tank cap assy.
(d)
After repair or replace, perform ”EVAP SYS CHECK” by hand-held tester. (Go to step 2)
7
CHECK FUEL HOSE(VSV FOR PRESSURE SWITCHING VALVE - CHARCOAL
CANISTER)
(a)
Check for proper connection of the fuel tank and fuel EVAP pipe (See page
), fuel EVAP pipe and
fuel tube under the floor, fuel tube under the floor and charcoal canister.
(b)
Check the hose and tube for cracks, hole and damage.
NG
REPAIR OR REPLACE
OK
8
CHECK CHARCOAL CANISTER ASSY (See page
)
NG
REPLACE CHARCOAL CANISTER ASSY
OK
A53763
VC
E2
A53769
E2
PTNK
05-96
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
249
9
INSPECT ECM(CHECK VOLTAGE)
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminals VC and E2 of the
ECM connector.
Voltage: 4.5 - 5.5 V
NG
CHECK AND REPLACE ECM
OK
10
INSPECT ECM(CHECK VOLTAGE)
(a)
Remove the fuel tank cap.
(b)
Turn the ignition switch ON.
(c)
Measure the voltage between terminals PTNK of the
ECM E6 connector and E2 of the ECM E10 connector.
Voltage: 3.0 - 3.6 V
OK
Go to step 12
NG
11
CHECK HARNESS AND CONNECTOR(VAPOR PRESSURE SENSOR - ECM)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE VAPOR PRESSURE SENSOR ASSY
12
CHECK FUEL TANK AND FUEL TANK OVER FILL CHECK VALVE FOR CRACKS
AND DAMAGE
NG
REPLACE FUEL TANK ASSY
OK
IT IS LIKELY THAT VEHICLE USER DID NOT PROPERLY CLOSE FUEL TANK CAP
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
Fig. 1
VSV for
CCV
VSV
for EVAP
ECM
Vapor Pressure
Sensor
Fuel Tank Over
Fill Check Valve
Fuel Tank
Charcoal Canister
VSV for
Pressure
Switching Valve
A10142
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-97
250
DTC
P0441
EVAPORATIVE EMISSION CONTROL
SYSTEM INCORRECT PURGE FLOW
DTC
P0446
EVAPORATIVE EMISSION CONTROL
SYSTEM VENT CONTROL MALFUNCTION
CIRCUIT DESCRIPTION
The vapor pressure sensor,
VSV for canister closed valve (CCV), VSV for pressure switching valve are used
to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components
within the dotted line in Fig. 1 below, or when there is a malfunction in either the VSV for EVAP, the VSV for
pressure switching valve, or in the vapor pressure sensor itself.
0560M-06
A54287
VSV for CCV
VSV for
Pressure Switching Valve
VSV for EVAP
Cold Start
ECT/IAT near same temp.
Negative
Pressure
Occurs
Tank & Canister
Leak Check
VSV for Pressure
Switching Valve, CCV
Testing
Open
Closed
Open
Closed
Open
Closed
Closed
Closed
Open
Open
P0441
P0440
P0446
05-98
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DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
251
P0441:
The ECM closes the CCV and opens the VSV for pressure switching valve causing vacuum to increase in
the entire EVAP system.
The ECM continues to operate the VSV for EVAP until the vacuum is increased to a specified point at which
time the ECM closes the VSV for EVAP.
If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the
VSV for EVAP and related components to be faulty.
P0446:
When the vapor pressure rises to a specified point, the ECM opens the VSV for CCV. Pressure will increase
rapidly because of the air allowed into the system. No increase or an increase below specified rate of pressre
increase indicates a restriction on the air inlet side.
The ECM closes the VSV for pressure switching valve. This action blocks air entering the fuel tank side of
system. The pressure rise on the fuel tank side is no longer as great.
If there was no change in pressure, the ECM will conclude the VSV for pressure switching valve did not close.
DTC No.
DTC Detecting Condition
Trouble Area
P0441
Pressure in charcoal canister and fuel tank does not drop dur-
ing purge control (2 trip detection logic)
Vacuum hose cracks, holed blocked, damaged or discon-
nected ((1), (2),
(3), (4), (5), (6), (7), (8), (9), (10) and (11) in
Fig 1)
P0441
During purge cut-off, negative pressure incoming in the char-
coal canister and fuel tank will not stop. (2 trip detection logic)
Fig. 1)
Fuel tank cap incorrectly installed
Open or short in vapor pressure sensor
circuit
When VSV for pressure switching valve
is ON, ECM judges
that there is no continuity between vapor pressure sensor, fuel
tank and charcoal canister (2 trip detection logic)
Vapor pressure sensor
Open or short in VSV circuit for EVAP
VSV for EVAP
Open or short in VSV circuit for CCV
P0446
When VSV for pressure switching valve is turned OFF, pres-
sure in fuel tank is maintained at atmospheric pressure (2 trip
detection logic)
O en or short in VSV circuit for CCV
VSV for CCV
Open or short in VSV circuit for pressure switching valve
VSV for pressure switching valve
Fuel tank cracked holed or damaged
When VSV for CCV is ON, pressure in charcoal canister and
fuel tank is maintained at atmospheric pressure (2 trip detec-
tion logic)
Fuel tank cracked, holed or damaged
Charcoal canister cracked, holed or damaged
Fuel tank over fill check valve cracked damaged
ECM
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