Toyota Sequoia (2005). Manual — part 176
A01995 A15196
A15197
IACV
IACV closed (VSV: ON)
Intake
Manifold
60
°
Throttle valve
opening angle
Engine speed (rpm)
4,700
–
DIAGNOSTICS
ENGINE
DI–499
693
IACV Control Circuit
CIRCUIT DESCRIPTION
This circuit opens and closes the Intake Air Control Valve (IACV) in response to the engine load in order to
increase the intake efficiency (ACIS: Acoustic Control Induction System).
When the engine speed is 4,700 rpm or more and the throttle valve opening angle is 60
°
or more, the VSV
is OFF, so the is IACV open. All the other times, the ECM turns the VSV ON and closes the IACV.
DIDG0–01
A14809
B
B
W
W
B
2
EB2
V2
VSV (ACIS)
2
1
L–W
21
E4
ECM
ACIS
MREL
13
E3
P–B
B–R
1
1
1
1
1
1
1
1
1
2
EFI No. 2
EFI Main Relay
2
1
3
5
EFI No. 1
1
2
Engine Room No. 1 R/B
B–L
Battery
B–W
W–B
J3
J/C
A
A
D
D
W–B
EC
W
FL MAIN
1
1
4B
4A
FL BLOCK
J7
J/C
W–B
1A
DI–500
–
DIAGNOSTICS
ENGINE
694
WIRING DIAGRAM
A00307
ON
VSV is ON
VSV is OFF
Air Filter
Air
Air
E
F
E
F
BE6653
FI7073 FI7074
–
DIAGNOSTICS
ENGINE
DI–501
695
INSPECTION PROCEDURE
1
Connect hand–held tester, and check operation of VSV for ACIS.
PREPARATION:
(a)
Connect the hand–held tester to the DLC3.
(b)
Turn the ignition switch ON and push the hand–held tes-
ter main switch ON.
(c)
Select the ACTIVE TEST mode on the hand–held tester.
CHECK:
Check the operation of the VSV when the VSV is operated by
the hand–held tester.
OK:
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
Check for vacuum tank (See page
NG
2
Check VSV for ACIS (See page
NG
Replace VSV for ACIS.
OK
A23670
Wire Harness Side
V12
VSV for ACIS connector
B17413
E5
E7
E1
ACIS
DI–502
–
DIAGNOSTICS
ENGINE
696
3
Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and ECM (See page
).
(a)
Check the wire harness between the VSV for ACIS and
connector the ECM connector.
(1)
Disconnect the VSV for ACIS connector.
(2)
Disconnect the E5 and E7 ECM connector.
(3)
Check for resistance between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)
Specified condition
VSV for ACIS (V12–2) – ACIS (E5–33)
Below 1
Ω
Standard (Check for short):
Symbols (Terminal No.)
Specified condition
VSV for ACIS (V12–2) or ACIS (E5–33) – E1 (E7–1)
10 k
Ω
or higher
(b)
Check the wire harness between the VSV for ACIS con-
nector and the EFI relay.
(1)
Disconnect the VSV for ACIS connector.
(2)
Remove the EFI relay from the engine room R/B.
(3)
Check for resistance between the wire harness side
connectors.
Standard (Check for open):
Symbols (Terminal No.)
Specified condition
VSV for ACIS (V12–1) – EFI relay terminal 3 of R/B
Below 1
Ω
NG
Repair or replace harness or connector.
OK
Check and replace ECM (See page
).
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