Lexus ES300 (1997 year). Manual — part 342

A00307

ON

VSV is ON

VSV is OFF

Air Filter

Air

Air

E

F

E

F

BE6653
FI7073 FI7074

–

DIAGNOSTICS

ENGINE

DI–145

297

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

LEXUS hand–held tester

1

Connect LEXUS hand–held tester and check operation of VSV for ACIS.

PREPARATION:
(a)

Remove the fuse cover on the instrument panel.

(b)

Connect the LEXUS hand–held tester to the DLC3.

(c)

Turn ignition switch ON and LEXUS hand–held tester
main switch ON.

(d)

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

CHECK:
Check operation of VSV when VSV is operated by the 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 the air filter.

OK

Check for vacuum tank (See page

SF–40

).

NG

2

Check VSV for ACIS (See page

SF–54

).

NG

Replace VSV for ACIS.

OK

A00308

ON

ACIS(+)

BE6653
P23894

DI–146

–

DIAGNOSTICS

ENGINE

298

1997 LEXUS ES300 (RM511U)

3

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

IN–27

).

NG

Repair or replace harness or connector.

OK

Check and replace ECM (See page

IN–27

).

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

1

Check VSV for ACIS (See page

SF–54

).

NG

Replace VSV for ACIS.

OK

2

Check voltage between terminal ACIS of ECM connector and body ground.

PREPARATION:
(a)

Remove the glove compartment (See page

SF–64

).

(b)

Turn ignition switch ON.

CHECK:
Measure voltage between terminal ACIS of ECM connector and
body ground.
OK:

Voltage: 9

∼

14 V

NG

Check for open and short in harness and
connector between EFI main relay and ECM
(See page

IN–27

).

OK

–

DIAGNOSTICS

ENGINE

DI–147

299

1997 LEXUS ES300 (RM511U)

3

Check for vacuum tank (See page

SF–45

).

NG

Repair or replace.

OK

Check and replace ECM (See page

IN–27

).

DI0C9–01

Vehicle Brought to Workshop

Customer Problem Analysis

Check DTC and Freezes Frame Data (Precheck)

Record or Print DTC and Freezed Frame Data P.

DI–150

Clear DTC and Freezed Frame Data P.

DI–150

Visual Inspection

Setting the Check Mode Diagnosis P.

DI–150

1

Items inside

are titles of pages in this manual, with the

page number indicated in the bottom portion. See the indicated
pages for detailed explanations.

Connect an OBD II scan tool or LEXUS hand–held tester to DLC3.

If the display shows ”UNABLE TO CONNECT TO VEHICLE” when you have connected the
scan tool / LEXUS hand–held tester, inspect DLC3 P.

DI–150

2

3

4

5

6

symptom does not occur

Problem Symptom Confirmation

8

7

Symptom Simulation

P.

IN–17

symptom occur

DTC Check

P.

DI–150

OK Code

11

Preliminary Check

P.

DI–150

DTC Chart

P.

DI–161

Mechanical System Test

P.

DI–150

Manual Shifting Test

P.

DI–150

OK

OK

Chapter 1
(Electronic)

Chapter 2
(On–Vehicle)

P.

DI–164

OK

Chapter 3
(Off–Vehicle)

OK

Matrix Chart of Problem Symptoms –
P.

DI–164

Circuit
Inspection

Main Throttle Signal Check

Stop Light Signal Check

NG

Parts Inspection

NG

NG

NG

Identification of Problem

Repair

Confirmation Test

End

NG

NG

12

NG

13

14

15

16

17

9

10

P.

DI–164

P.

DI–164

P.

DI–188

to

DI–190

P.

DI–149

DI–148

–

DIAGNOSTICS

AUTOMATIC TRANSAXLE

300

1997 LEXUS ES300 (RM511U)

AUTOMATIC TRANSAXLE

HOW TO PROCEED WITH TROUBLESHOOTING