Lexus ES300 (2002 year). Manual - part 396

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

05-181

334

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

7

CHECK FUSE(E.F.I.)

NG

CHECK FOR SHORT IN ALL HARNESS AND
COMPONENTS CONNECTED EFI FUSE

OK

8

CHECK E.F.I ECU RELAY (See page 

10-2

)

NG

REPLACE E.F.I ECU RELAY

OK

9

CHECK HARNESS AND CONNECTOR(MREL  -  E2)

NG

REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

REPAIR OR REPLACE HARNESS AND CONNECTOR

A57026

Vacuum Tank

E.F.I. ECU Relay

IG2 (30A)

AM2 (30A) E.F.I. (20A)

Engine Mounting Insulator FR

Vacuum Switching Valve

Air Cleaner Cap

A

C

B

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

335

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

ACTIVE CONTROL ENGINE MOUNT

LOCATION

056HD-01

A62465

MREL

8

VSV for ACM

E6

B-W

B-W

Battery

B-G

B-G

FL MAIN

Engine 
Room R/B

W-B

2

1A

E.F.I.

1

1

5

3

E.F.I. ECU Relay

3

1C

2

1

ED

1K

1B

Engine Room J/B

5

6

ACM1

24

E10

ECM

1

2

B-L

A61613

A

C

Engine

B

Intake Air Control Valve 
Actuator

Vacuum Tank

Air Cleaner

Front Engine Mount Insulator

VSV

Cap

ECM

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

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336

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

CIRCUIT DESCRIPTION

Active control engine mount (ACM) system dampens engine vibration at low engine speed using ACM VSV.
The VSV is controlled by a pulse signal transmitted to the VSV from the engine control module (ECM). In
normal operation, the frequency of this pulse signal is correctly matched to engine speed to effectively damp-
en engine vibration.

WIRING DIAGRAM

INSPECTION PROCEDURE

1

CHECK VACUUM HOSE

(a)

Check whether the cap of vacuum  hose is missing or not.

(b)

Do not repair the hose with a cap by cutting it. If the hose
is damaged, be sure to replace whole vacuum hose as-
sembly.

(c)

Check the air/vacuum hose for looseness, disconnection
and blockage.

NG

REPAIR OR REPLACE VACUUM HOSE

OK

A61611

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DIAGNOSTICS

SFI SYSTEM (1MZ-FE)

337

2002 LEXUS ES300 REPAIR MANUAL   (RM911U)

2

PERFORM ACTIVE TEST BY OBD II SCAN TOOL  OR  HAND-HELD
TESTER(ACTIVE CONTOROL ENGINE MOUNT)

(a)

Warm up engine to normal operating temperature.

(b)

Connect the hand-held tester to the DLC3.

(c)

Select the ACM inhibit active test on the hand-held tester.

(d)

Shift transmission into ”N” or ”P” range.

(e)

Check whether or not engine vibration is increased while the ACM inhibit active test is in the ”ON” state.
Result: Engine vibration is increased.

NG

Go to step 4

OK

3

CHECK INTAKE MANIFOULD VACUUM PRESSURE

(a)

Warm up engine to normal operating temperature.

(b)

Chock the 4 wheels.

(c)

Fully apply the parking brake.

(d)

Keep your foot pressing firmly on the brake pedal.

(e)

Shift transmission into ”D” position.

(f)

Disconnect the vacuum hose.

(g)

Check that disconnected hose applies suction to your fin-
ger intermittently.

OK

SYSTEM OK

NG