3MZ-FE INTAKE – INTAKE AIR CONTROL SYSTEM IT–3
VSV Assembly for IAC
ECM
Valve Assembly No.3
33
AICV
VSV Assembly for IAC
EFI Relay Valve Assembly No.2
EFI
5 3 15
ACIS
2 1 8
MREL
1
E1
Main
IT
Battery
A085562E01
Vacuum Gauge
ON-VEHICLE INSPECTION
1. INSPECT INTAKE AIR CONTROL SYSTEM
(a) Using a 3-way connector, connect vacuum gauge to
the actuator hose.
(b) Connect the intelligent tester to the DLC3.
(c) Start the engine.
(d) On the intelligent tester, enter the ACTIVE TEST
mode.
A085554E01
Standard
Switch Condition Switch Condition
Approx. 27.6 kPa (200 mmHg, 7.9
VSV ON
in.Hg)
VSV OFF 0 kPa (0 mmHg, 0 in.Hg)
IT–4 3MZ-FE INTAKE – INTAKE AIR CONTROL SYSTEM
INSPECTION
1. INSPECT INTAKE AIR CONTROL VALVE ASSEMBLY
NO.3
(a) Apply 26.7 kPa (200 mmHg, 7.9 in.Hg) of vacuum to
the actuator. Check if the valve rotates open, as
shown in the illustration.
(b) Apply the vacuum for 1 minute. The actuator should
continue to be keeping the valve open.
Valve
A085561E01
If the result is not as specified, replace the IAC valve
assembly No. 3.
2. INSPECT VACUUM SWITCHING VALVE FOR IAC
Ohmmeter VALVE ASSEMBLY NO.3
(a) Check the VSV resistance.
37 to 44 Ω Resistance
2
Tester Connection Specified Condition
1-2 37 to 44 Ω at 20°C (68°F)
1 - Body ground
10 kΩ or higher
2 - Body ground
1 If the result is not as specified, replace the VSV
assembly No. 3.
Ohmmeter
10 kΩ or Higher
Body Ground
2
IT
1
A085569E01
(b) Check VSV operation.
Filter (1) Check that air flows from port E to the filter.
E
Air
A075333E01
(2) Apply battery voltage across the terminals.
Check that air flows from port E to port F.
If the result is not as specified, replace the VSV
assembly No. 3.
F
E Air
Battery
A075334E01
3MZ-FE INTAKE – INTAKE AIR CONTROL SYSTEM IT–5
3. INSPECT AIR CLEANER CAP SUB-ASSEMBLY
(a) Cover port C with your finger, and check that air
flows from port B to port A.
(b) Cover port C with your finger, and check that air
does not flow from port A to port B.
(c) Cover ports A and C with your fingers, and apply 60
kPa (450 mmHg, 18 in.Hg) of vacuum to port B for 1
minute. Check that there is no change in the
vacuum after 1 minute.
A085559 If the result is not as specified, replace the air
cleaner cap.
4. INSPECT VACUUM SWITCHING VALVE FOR IAC
Ohmmeter 33 to 39 Ω VALVE ASSEMBLY NO.2
(a) Check the VSV resistance.
2 1 Resistance
Tester Connection Specified Condition
1-2 33 to 39 Ω at 20°C (68°F)
1 - Body ground
10 kΩ or higher
2 - Body ground
If the result is not as specified, replace the VSV
assembly.
Ohmmeter 10 kΩ or Higher
2 1
IT
Body Ground A085570E01
(b) Check VSV operation.
Air (1) Check that air flows from port E to the filter.
Filter
FI06393E02
(2) Apply battery voltage across the terminals.
Air (3) Check that air flows from port E to port F.
If the result is not as specified, replace the VSV
assembly.
F
Battery
S004523E02
3MZ-FE INTAKE – INTAKE AIR CONTROL SYSTEM IT–1
INTAKE AIR CONTROL SYSTEM
3MZ-FE INTAKE
ENGINE
PARTS LOCATION
IAC VALVE ASSEMBLY NO.2
ECM
VSV ASSEMBLY FOR IAC
VALVE ASSEMBLY NO.2
AIR CLEANER
SUB-ASSEMBLY
IT
VSV ASSEMBLY FOR IAC
VALVE ASSEMBLY NO.3 ENGINE ROOM R/B AND
ENGINE ROOM J/B
IAC VALVE ASSEMBLY NO.3
EFI RELAY
EFI FUSE
A109048E01
IT–2 3MZ-FE INTAKE – INTAKE AIR CONTROL SYSTEM
SYSTEM DIAGRAM
IAC Valve Assembly No.2
Throttle Valve
Air Cleaner Cap Sub-assembly
VSV Assembly for IAC
Valve Assembly No.2
IAC Valve
Assembly No.3
IT
VSV Assembly for IAC
Valve Assembly No.3
ECM Engine Speed
Throttle Opening Angle
A085571E01
IT–6 3MZ-FE INTAKE – INTAKE AIR CONTROL VALVE
INTAKE AIR CONTROL VALVE
Lever REMOVAL
1. REMOVE INTAKE AIR CONTROL VALVE ASSEMBLY
NO.2
(a) Remove the 3 bolts and nut.
(b) Rotate the lever to the closed position as shown in
the illustration and pull out the IAC valve.
A081629E01 (c) Remove the gasket from the intake air surge tank.
Valve INSPECTION
Lever
1. INSPECT INTAKE AIR CONTROL VALVE ASSEMBLY
NO.3
(a) Apply 26.7 kPa (200 mmHg, 7.9 in.Hg) of vacuum to
the actuator. Check if the actuator rod pulls the lever
and causes the valve to rotate open, as shown in
the illustration.
(b) Apply the vacuum for 1 minute. Check that the
Actuator Rod
A085563E01
actuator rod does not return.
If the result is not as specified, replace the IAC valve
assy No. 2.
IT
3MZ-FE INTAKE – INTAKE AIR CONTROL VALVE IT–7
INSTALLATION
1. INSTALL INTAKE AIR CONTROL VALVE ASSEMBLY
NO.2
(a) Install a new gasket to the intake air surge tank.
(b) Install the IAC valve with the 3 bolts and nut.
Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf)
IT
