Lexus ES300 (2002 year). Manual - part 372

A53763

VC

E2

A53769

E2

PTNK

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-107

260

9

CHECK VACUUM HOSES(8,9,10 AND 11 IN CIRCUIT DESCRIPTION)

(a)

Check that the vacuum hose is connected correctly.

(b)

Check the vacuum hose for looseness and disconnection.

(c)

check the vacuum hose for cracks, hole, damage and blockage.

NG

CHECK FUEL TANK OVER FILL CHECK VALVE

OK

10

INSPECT ECM(VC - E2)

(a)

Turn the ignition switch ON.

(b)

Measure voltage between terminals VC and E2 of the
ECM connector.
Voltage: 4.5 - 5.5 V

NG

CHECK AND REPLACE ECM

OK

11

INSPECT ECM(PTNK - E2)

(a)

Remove the fuel tank cap.

(b)

Turn the ignition switch ON.

(c)

Measure the voltage between terminals PTNK and E2 of
the ECM connector.
Voltage: 3.0 - 3.6 V

OK

Go to step 13

NG

12

CHECK HARNESS AND CONNECTOR(VAPOR PRESSURE SENSOR - ECM)

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

REPLACE VAPOR PRESSURE SENSOR ASSY

A53763

E2

EVP1

VSV is ON

VSV is OFF

Air

F

E

Air

F

E

A52140

05-108

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

261

13

CHECK VSV (FOR EVAP)

(a)

Turn the ignition switch ON.

(b)

Check the VSV function.
(1)

Connect between terminal EVP1 and E2 of the
ECM connector (VSV ON).

VSV is ON:
Air from port E flows out through port F
(2)

Disconnect between terminal EVP1 and E2 of the
ECM connector (VSV OFF).

VSV is OFF:
Air does not flow port E to port F

OK

Go to step 16

NG

14

CHECK OPERATION OF VSV(FOR EVAP) (See page 

12-6

)

OK

Go to step 15

NG

REPLACE VSV AND CHARCOAL CANISTER, AND THEN CLEAN VACUUM HOSE

15

CHECK HARNESS AND CONNECTOR(E.F.I.ECU RELAY - VSV FOR EVAP, VSV
FOR EVAP - ECM)

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE ECM

A53763

E2

CCV

VSV is ON

VSV is OFF

E

F

E

F

Air

Air

A12540

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-109

262

16

CHECK VSV (FOR CCV)

(a)

Turn the ignition switch ON.

(b)

Check the VSV function.
(1)

Connect between terminal CCV and E2 of the ECM
connector (VSV ON).

VSV is ON:
Air does not flow from port E to port F
(2)

Disconnect between terminal CCV and E2 of the
ECM connector (VSV OFF).

VSV is OFF:
Air from port E flows out through port F

OK

Go to step 19

NG

17

CHECK OPERATION OF VSV(FOR CCV) (See page 

12-6

)

OK

Go to step 18

NG

REPLACE VSV AND CHARCOAL CANISTER, AND THEN CLEAN VACUUM HOSE

18

CHECK HARNESS AND CONNECTOR(E.F.I. ECU RELAY - VSV FOR CCV, VSV
FOR CCV - ECM)

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE ECM

A53769

E2

TBP

VSV is ON

VSV is OFF

Air

E

F

Air

E

F

A52143

05-1 10

-

DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

263

19

CHECK VSV (FOR PRESSURE SWITCHING VALVE)

(a)

Turn the ignition switch ON.

(b)

Check the VSV function.
(1)

Connect between terminal TBP and E2 of the ECM
connector (VSV ON).

VSV is ON: Air from port E flows out through port F
(2)

Disconnect between terminal TBP and E2 of the
ECM connector (VSV OFF).

VSV is OFF: Air does not from flow port E to port F

OK

Go to step 22

NG

20

CHECK OPERATION OF VSV(FOR PRESSURE SWITCHING VALVE) 
(See page 

12-6

)

OK

Go to step 21

NG

REPLACE VSV AND CHARCOAL CANISTER, AND THEN CLEAN VACUUM HOSE

21

CHECK HARNESS AND CONNECTOR(E.F.I. ECU RELAY - VSV FOR PRESSURE
SWITCHING VALVE, VSV FOR PRESSURE SWITCHING VALVE  -  ECM)

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

CHECK AND REPLACE ECM