Lexus ES300 (2002 year). Service manual - part 368

A53797

A53798

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-91

244

NOTICE:
Do not shut off the engine - the results will be invalid.

2.

Pass Condition - No Problem Found by the ECM

If the EVAP evaluation monitor shows COMPL, go to the Non-
Continuous Test screen.
NOTICE:
Do not shut off the engine - the results will be invalid.

(1)

To get there, go to Advanced OBD II, Onboard
Tests, Non-continuous Tests.

(2)

If all of the tests in the time $02 category Tests show
Pass, the evaluation monitor has operated and no
problem was detected.

3.

Fail Condition - Problem Detected by the ECM

If the EVAP evaluation monitor shows INCMPL, go to the Non-
Continuous Test screen.

(1)

If all Tests show Pass, the following may have oc-
curred.

The EVAP evaluation monitor did not oper-
ate.

The EVAP evaluation monitor did not finish.

The ECM withheld judgement.

(2)

If one or more of the tests in the time $02 category
show Fail, the EVAP evaluation monitor did operate
and the ECM detected a problem.

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

245

(3)

Go to Continuous Tests screen. This is the only
place DTC’s are listed for the first trip.

NOTICE:
The DTC listed may not be valid. A second trip is needed
to confirm the DTC.

4.

Second Trip Procedure

(a)

Vehicle must be cold, ambient temperature approximate-
ly between 50

°

F - 95

°

F.

(b)

Go to Readiness Tests screen.

(c)

Drive the vehicle according to LA#4 drive cycle. Note the
state of EVAP evaluation monitor. This procedure may
take approximately 20 minutes or more.

NOTICE:
Do not shut off the engine - the results will be invalid.

(d)

If Readiness Tests changes to COMPL, the EVAP evalua-
tion monitor has operated. Check for any stored DTC’s.

If a DTC has stored, the problem has been detected
and confirmed by the ECM.

If no DTC was found, the EVAP monitor operated
but no problem was detected.

INSPECTION PROCEDURE

HINT:

If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440 or P0442, first troubleshoot DTC
P0441, P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 or P0442 next.

Ask the customer whether, after the MIL came on, the customer found the fuel tank cap loose and tight-
ened it. Also ask the customer whether the fuel tank cap was loose when refuelling. If the fuel tank cap
was loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was not
sure if it was loose, troubleshoot according to the following procedure.

Read freeze frame data using hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for deter-
mining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio
was lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
vapor pressure sensor.

VSV is ON

VSV is OFF

Air

F

E

Air

F

E

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VSV is ON

VSV is OFF

E

F

E

F

Air

Air

A12540

VSV is ON

VSV is OFF

Air

E

F

Air

E

F

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

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246

1

PERFORM ACTIVE TEST BY HAND-HELD TESTER

(a)

Select the ACTIVE TEST mode on the hand-held tester.

(b)

Disconnect the vacuum hose from the VSV for the EVAP.

(c)

Start the engine.

(d)

Select the item ”EVAP VSV(ALONE)” in the ACTIVE
TEST and operate the VSV for EVAP.

(e)

When the VSV for the EVAP is operated by the hand-held
tester, apply the disconected hose to your finger to check
the suction.
Result: 
VSV is ON: Disconnected hose sucks.
VSV is OFF: Disconnected hose does not suck.

(f)

Select the item ”CAN CTRL VSV” in the ACTIVE TEST
and operate the VSV for CCV.

(g)

Check the VSV for CCVoperation when it is operated by
the hand-held tester.
Result: 
VSV is ON: Disconnected hose sucks.
VSV is OFF: Disconnected hose does not suck.

(h)

Select the item ”TANK BYPASS VSV” in the ACTIVE
TEST and operate the VSV for pressure switching valve.

(i)

Check the VSV for pressure switching valve operation
when it is operated by the hand-held tester.
Result: 
VSV is ON: Disconnected hose sucks.
VSV is OFF: Disconnected hose does not suck.

NG

REPAIR OR REPLACE

OK

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

247

2

PERFORM ACTIVE TEST BY FOR EVAPORATIVE EMISSIONS LEAK(EVEP SYS
CHECK)

(a)

Connect the hand-held tester to the DLC3.

(b)

Select the ”EVAP SYS CHECK” mode on the hand-held tester.

(c)

Perform ”EVAP SYS CHECK”.
DISPLAY:

A

B

C

Scantool detecs a leak 

on the fuel tank side.

Scantool detects a leak

on the canister side.

Scantool does not detect a leak

in the EVAP system.

B

Go to step 7

C

CHECK VACUUM HOSES

A

3

INSPECT FUEL TANK CAP ASSY(TOYOTA GENUINE PARTS) (See page 

12-6

)

(a)

Replace to toyota genuine parts.

(b)

After replace, perform ”EVAP SYS CHECK” by hand-held tester. (Go to step 2.)

OK

Go to step 4

NG

REPLACE TO TOYOTA GENUINE PARTS

4

CHECK THAT FUEL TANK CAP IS CORRECTLY INSTALLED

(a)

Correctly install fuel tank cap.

(b)

After install, perform ”EVAP SYS CHECK” by hand-held tester. (Go to step 2)

OK

Go to step 5

NG

CORRECTLY INSTALL FUEL TANK CAP

5

INSPECT FUEL TANK CAP ASSY (See page 

12-6

)

(a)

Replace to fuel tank cap assy.

(b)

After replace, perform ”EVAP SYS CHECK” by hand-held tester. (Go to step 2)

OK

Go to step 6

NG