Lexus ES300 (2002 year). Manual — part 393
A62461
Valve No.2
Valve No.1
Throttle Valve
Valve No.1, No.2 closed (VSV: ON)
Valve No.1 open (VSV: OFF)
Engine Speed
Valve No.2 closed (VSV: ON)
Throttle V
alve
Valve No.1, No.2 open (VSV: OFF)
Opening Angle
3,000 rpm
4,100 rpm
A57003
B - G
FL
MAIN
W - B
1K
E6
E.F.I.
MREL
ACIS
ACI1
ECM
E01
+B
2
5
6
3
15
8
Battery
ED
E10
E01
R - Y
Y - G
B - W
1
1
2
2
1B
1C
1A
3
1
2
5
E.F.I. ECU Relay
Engine Room J/B
VSV for ACIS No.1
VSV for ACIS No. 2
B - W
B - W
1
1
Engine Room
R/B
14
B - G
VSV for AICV No.3
E10
25
E10
AICV
1
2
W
B - W
05-170
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
323
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
ACIS CONTROL CIRCUIT
CIRCUIT DESCRIPTION
This circuit is opens and closes the Intake Air Control Valve in response to the engine load in order to in-
crease the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 4,100 rpm or less and the throttle valve opening angle is 30
°
or more, the ECM
turns the two VSV ON or OFF and operate the Intake Air Control Valve.
WIRING DIAGRAM
051MU-11
A60850
VSV is ON
VSV is OFF
Air
E
F
Air
E
F
Air Filter
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
05-171
324
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
Hand-held Tester:
1
PERFORM ACTIVE TEST BY HAND-HELD TESTER(VSV FOR ACIS)
(a)
Turn the ignition switch ON and hand-held tester main
switch ON.
(b)
Select the INTAKE CTRL VSV from the ACTIVE TEST
menu on the hand-held tester.
(c)
Check the operation of the VSV when the VSV is oper-
ated by the hand-held tester.
VSV is ON:
Air from port E flows out through port F.
VSV is OFF:
Air from port E flows out through the air filter.
OK
INSPECT VACUUM TANK
NG
2
CHECK VSV(FOR ACIS) (See page
NG
REPLACE VACUUM SWITCHING VALVE ASSY
NO.1
OK
3
CHECK HARNESS AND CONNECTOR(E.F.I. ECU RELAY - ECM)
NG
REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM
OBDII scan tool (excluding Hand-held Tester):
1
CHECK VSV(FOR ACIS) (See page
NG
REPLACE VACUUM SWITCHING VALVE ASSY
NO.1
OK
A53763
ACIS
E2
ACI1
05-172
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
325
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
2
INSPECT ECM
(a)
Turn the ignition switch ON.
(b)
Measure the voltage between terminals ACI1, ACIS and
E2 of the ECM connector.
Voltage: 9 - 14 V
NG
CHECK HARNESS AND CONNECTOR
OK
3
INSPECT VACUUM TANK (See page
)
NG
REPAIR OR REPLACE
OK
CHECK AND REPLACE ECM
051LR-06
A57014
ECM
Mass Air Flow Meter
VSV
(for Air Intake Control Valve)
DLC3
Vapor
Pressure sensor
Fuel Pump
VSV
(for Canister Closed Valve)
Accelerator Pedal
Position Sensor
Crankshaft Position
Sensor
VSV
(for ACIS No. 2)
VSV
(for EVAP)
Engine Coolant
Temp.Sensor
Ignition Coil
with Igniter
Injector
Throttle Position
Sensor
VSV (for ACIS No. 1)
Heated Oxygen Sensor
(Bank 2, Sensor 2)
Air Fuel Ratio Sensor
(Bank 1, Sensor 1)
Heated Oxygen Sensor
(Bank 1, Sensor 2)
Air Fuel Ratio Sensor
(Bank 2, Sensor 1)
Knock Sensor
VSV
(for Pressure Swithching Valve)
VVT Sensor
(Bank 1)
Knock Sensor
Camshaft Timing
Oil Control Valve
VVT Sensor
(Bank 2)
Camshaft Timing
Oil Control Valve
05-26
-
DIAGNOSTICS
SFI SYSTEM (1MZ-FE)
179
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
LOCATION
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