Lexus ES300 (2002 year). Manual — part 367

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-87

240

2002 LEXUS ES300 REPAIR MANUAL (RM911U)

4

CHECK OXYGEN NO.2 SENSOR (BANK1, 2 SENSOR2) (See page

12-6

)

NG

REPAIR OR REPLACE OXYGEN NO.2 SENSOR

OK

REPLACE EXHAUST PIPE ASSY CENTER

(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

A10140

05-88

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

241

DTC

P0440

EVAPORATIVE EMISSION CONTROL
SYSTEM MALFUNCTION

DTC

P0442

EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (SMALL LEAK)

CIRCUIT DESCRIPTION

The vapor pressure sensor,

VSV for canister closed valve (CCV)

and 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.
DTC P0440 or P0442 is recorded by the ECM when evaporative emissions leak from the components within
the dotted line in Fig. 1 below, or when the vapor pressure sensor malfunctions.

0560K-04

A14661

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, P0442

P0446

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-89

242

After purge operation, the VSV for EVAP is turned off sealing the vacuum in the system and the ECM begins
to monitor the pressur increase. Some increase in normal. A very rapid, sharp increase in pressure indicates
a leak in the EVAP system and sets the DTC P0440.
A pressure rise just above normal indecates a very small hole and will set the DTC P0442.

DTC No.

DTC Detecting Condition

Trouble Area

P0440
P0442

After cold starting and when generating certain swift pressure
value in fuel tank enabling not to hold that value (2 trip detec-
tion logic)

Hose or tube cracked, hole, damaged or loose seal ((3) in
Fig. 1)

Fuel tank cap incorrectly installed

Fuel tank cap cracked or damaged

Vacuum hose cracked, holed, blocked, damaged or discon-
nected ((1) or (2) in Fig. 1)

Fuel tank cracked, holed or damaged

Charcoal canister cracked, holed or damaged

Open or short in vapor pressure sensor circuit

VSV for CCV

VSV for EVAP

VSV for pressure seitching valve

Vapor pressure sensor

Fuel tank over fill check valve cracked or damaged

ECM

A62013

18

Vapor Pressure Sensor

LG

CCV

EVP1

E2

PTNK

ECM

TBP

E10

MREL

VC

E6

IA3

8

4

BR

P

ID1

B-W

Y

From
Battery

VSV for EVAP

1A

E.F.I.

Driver
Side J/B

2G

B-W

L

IL2

E10

E8

E6

E8

E6

21

28

11

12

IL2

IA3

Y

Y

P

BR

BR

1

2

3

B-W

1

2

2

1

VSV for CCV

ID1

4

6

2

9

10

1

V

V

1

2

VSV for Pressure
Switching Valve

B-R

B-R

2K

5

17

B-W

W-B

E.F.I.
ECU Relay

ED

Engine Room J/B

1C

1B

1C

1K

5

3

2

1

6

4

3

2

5

BR-Y

A53796

05-90

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

243

WIRING DIAGRAM

CONFIRMATION READINESS TEST

1.

First Trip Procedure

(a)

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

°

F - 95

°

F.

(b)

Intake Air Temp. (IAT) and Engine Coolant Temp. (ECT)
sensor almost same value.

(c)

Clear DTC’s.

Disconnecting the battery terminals or EFI fuse.

Readiness tests will show INCMPL (incomplete).

(d)

Drive the vehicle according to LA#4 drive cycle. Note the
state of Readiness Tests. They will change to COMPL as
the evaluation monitors operate and if the system passes.
This procedure may take approximately 20 minutes or
more.