Lexus ES300 (1997 year). Manual — part 328

S00046

–

DIAGNOSTICS

ENGINE

DI–89

241

1997 LEXUS ES300 (RM511U)

1

Check whether hose close to fuel tank have been modified, and check whether
there are signs of any accident near fuel tank or charcoal canister.

CHECK:
Check for cracks, deformation and loose connection of these
parts:

Fuel tank

Charcoal canister

Fuel tank filler pipe

Hoses and tubes around the fuel tank and charcoal canis-
ter

NG

Repair or replace.

OK

2

Check that fuel tank cap is LEXUS genuine parts.

NG

Replace to LEXUS genuine parts.

OK

3

Check that fuel tank cap is correctly installed.

NG

Correctly install fuel tank cap.

OK

4

Check fuel tank cap (See page

EC–5

).

NG

Replace fuel tank cap.

OK

DI–90

–

DIAGNOSTICS

ENGINE

242

1997 LEXUS ES300 (RM511U)

5

Check filler neck for damage.

PREPARATION:
Remove the fuel tank cap.
CHECK:
Visually inspect the filler neck for damage.

NG

Replace filler pipe.

OK

6

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

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 and damage.

NG

Repair or replace.

OK

7

Check hose and tube between fuel tank and charcoal canister.

CHECK:
(a)

Check for proper connection of the fuel tank and fuel evap pipe (See page

SF–1

), 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 for cracks, hole and damage (See page

EC–5

).

NG

Replace charcoal canister.

OK

A00228

ON

E2

(–)

VC

(+)

BE6653
S00564

A00229

PTNK

(+)

ON

E2

(–)

(1)

(2)

Vacuum

BE6653
S00568
P24976
S00047

–

DIAGNOSTICS

ENGINE

DI–91

243

1997 LEXUS ES300 (RM511U)

9

Check voltage between terminals VC and E2 of ECM connector.

CHECK:
(a)

Remove the glove compartment (See page

SF–64

).

(b)

Turn ignition switch ON.

CHECK:
Measure voltage between terminals VC and E2 of ECM con-
nector.
OK:

Voltage: 4.5

∼

5.5 V

NG

Check and replace ECM (See page

IN–27

).

OK

10

Check voltage between terminals PTNK and E2 of ECM connectors.

PREPARATION:
(a)

Remove the glove compartment (See page

SF–64

).

(b)

Turn ignition switch ON.

CHECK:
Measure voltage between terminals PTNK and E2 of ECM con-
nectors.

(1)

Disconnect the vacuum hose from the vapor pres-
sure sensor.

(2)

Using the MITYVAC (Hand–Held Vacuum Pump),
apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg)
to the vapor pressure sensor.

NOTICE: The vacuum applied to the vapor pressure sensor
must be less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:

(1) Voltage: 2.9

∼

3.7

V

(2) Voltage: 0.5 V or less

OK

Go to step 12.

NG

S00048

DI–92

–

DIAGNOSTICS

ENGINE

244

1997 LEXUS ES300 (RM511U)

11

Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page

IN–27

).

NG

Repair or replace harness or connector.

OK

Replace vapor pressure sensor.

12

Check fuel tank for cracks and damage.

PREPARATION:
(a)

Disconnect the vacuum hose from charcoal canister.

(b)

Correctly install the fuel cap.

(c)

Apply a pressure of 5 kPa (50 gf/cm

2

, 0.7 psi) to the fuel

tank.

CHECK:
Check whether the pressure is maintained after 1 minute.
OK:

Pressure applied to the fuel tank is maintained.

NG

Replace fuel tank.

OK

It is likely that vehicle user did not properly close fuel tank cap.
Please explain to customer how to properly install fuel tank cap.