Lexus ES300 (1997 year). Manual - part 330

BE6653

S00558 S00557

A00474

ON

Air

E

Air

E

F

F

G

G

VSV is OFF

VSV is ON

–

DIAGNOSTICS

ENGINE

DI–97

249

1997 LEXUS ES300   (RM511U)

9

Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for EVAP and ECM (See page 

IN–27

).

NG

 Repair or replace harness or connector

OK

Check and replace ECM (See page 

IN–27

).

10

Check VSV for vapor pressure sensor.

PREPARATION:
(a)

Connect the LEXUS hand–held tester to the DLC3.

(b)

Turn ignition switch ON and OBD II scan tool or LEXUS
hand–held tester main switch ON.

(c)

Select the ACTIVE TEST mode on the LEXUS hand–held
tester.

CHECK:
Check the VSV operation, when it is operated by LEXUS
 hand–held tester.
OK:

VSV is ON:
Air from pipe E is flowing out through pipe F.
VSV is OFF:
Air from pipe E is flowing out through pipe G.

OK

Go to step 13.

NG

11

Check operation of VSV for vapor pressure sensor (See page 

SF–56

).

NG

Replace VSV for vapor pressure sensor.

OK

A00231

START

E2(–)

PTNK(+)

BE6653

S00561

S00568

DI–98

–

DIAGNOSTICS

ENGINE

250

1997 LEXUS ES300   (RM511U)

12

Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for vapor pressure sensor and ECM (See page 

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace ECM (See page 

IN–27

).

13

Connect LEXUS hand–held tester, when VSV connector for vapor pressure
sensor is disconnected and VSV for EVAP is ON, measure voltage between
terminals PTNK and E2 of ECM connectors.

PREPARATION:
(a)

Connect the LEXUS hand–held tester to the DLC3.

(b)

Disconnect the VSV connector for vapor pressure sensor.

(c)

Select the ACTIVE TEST mode on the LEXUS hand–held
tester.

(d)

Start the engine.

CHECK:
Measure voltage between terminals PTNK and E2 of ECM
connectors, when VSV for EVAP is ON, using the LEXUS 
hand–held tester.
OK:

Voltage:  2.0 V or less

OK

 Go to step 15.

NG

A00232

Start

Stop
ON

OFF

ON

OFF

Engine

VSV for
Vapor
Pressure
Sensor

VSV for
EVAP

5 sec.

5 sec.

Measure Voltage

E2(–)

PTNK(+)

S00049
S00568

–

DIAGNOSTICS

ENGINE

DI–99

251

1997 LEXUS ES300   (RM511U)

14

Check vacuum hose between charcoal canister and VSV for vapor pressure
sensor, and vapor pressure sensor and VSV for vapor pressure sensor.

CHECK:
(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

 Repair or replace.

OK

15

Check charcoal canister.

PREPARATION:
(a)

Connect the LEXUS hand–held tester to the DLC3.

(b)

Remove the fuel tank cap.

(c)

Disconnect the VSV connector for vapor pressure sensor.

(d)

Select the ACTIVE TEST mode on the LEXUS hand–held
tester.

(e)

Start the engine.

(f)

VSV for EVAP is ON by the LEXUS hand–held tester and
remains on for 5 sec.

CHECK:
Measure voltage between terminals PTNK and E2 of ECM con-
nectors 5 sec. after switching VSV for EVAP from ON to OFF.
OK:

Voltage:  2.5 V or less 

NG

 Replace charcoal canister.

OK

Check and replace ECM (See page 

IN–27

).

DI–100

–

DIAGNOSTICS

ENGINE

252

1997 LEXUS ES300   (RM511U)

OBD II scan tool (excluding LEXUS hand–held tester)

1

Check VSV connector for EVAP, VSV connector for vapor pressure sensor and
vapor pressure sensor connector for looseness and disconnection.

NG

 Repair or connect VSV or sensor connector.

OK

2

Check vacuum hose between intake manifold and VSV for EVAP, VSV for EVAP
and charcoal canister, charcoal canister and VSV for vapor pressure sensor, and
VSV for vapor pressure sensor and vapor pressure sensor.

CHECK:
(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

 Repair or replace.

OK

3

Check voltage between terminals VC and E2 of ECM connector 
(See page 

DI–87

, 

IG–1

).

NG

 Check and replace ECM (See page 

IN–27

).

OK

4

Check voltage between terminals PTNK and E2 of ECM connectors 
(See page 

DI–87

, 

SF–6

).

OK

 Go to step 6.

NG