Page 257 of 4770
5. REMOVE AIR CLEANER CAP, RESONATOR AND
AIR CLEANER HOSE
(a) Disconnect the intake air temperature sensor connec±
tor.
(b) California only:
Disconnect the air hose from the air cleaner hose.
(c) Loosen the air cleaner hose clamp bolt.
(d) Disconnect the 4 air cleaner cap clips.
(e) Disconnect the air cleaner hose from the throttle
body, and remove the air cleaner cap together with
the resonator and air cleaner hose. 1. DISCONNECT NEGATIVE (±) TERMINAL CABLE
FROM BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº
position and the negative (±) terminal cable is discon±
nected from the battery.
2. DRAIN ENGINE COOLANT
3. DISCONNECT ACCELERATOR CABLE FROM
THROTTLE LINKAGE
4. A/T:
DISCONNECT THROTTLE CABLE FROM
THROTTLE LINKAGE
6. REMOVE THROTTLE BODY
(a) Disconnect the throttle position sensor connector.
(b) Disconnect the IAC valve connector.
THROTTLE BODY REMOVAL
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±207
Page 258 of 4770
THROTTLE BODY INSPECTION
1. CLEAN THROTTLE BODY
(a) Using a soft brush and carburetor cleaner, clean the
cast parts.
(b) Using compressed air, clean all the passengers and
apertures.
NOTICE: To prevent deterioration, do not clean the
throttle position sensor.
(f) Disconnect the following hoses from the throttle
body, and remove the throttle body.
(1) Water bypass hose from water outlet
(2) Water bypass hose from water bypass pipe
(3) California:
Air hose from cylinder head
Except California:
Air hose from air tube (c) Disconnect the following hoses from the throttle
body.
(1) PCV hose
(2) 2 vacuum hoses from EGR vacuum modulator
(3) Vacuum hose from TVV (for EVAP)
7. IF NECESSARY, REMOVE IAC VALVE FROM
THROTTLE BODY
Remove the 4 screws, IAC valve and gasket.(d) Type A:
Remove the 4 bolts.
(e) Type B:
Remove the 2 bolts and 2 nuts.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±208
Page 259 of 4770

(b) Apply vacuum to the throttle opener.
(c) Insert a 0.60 mm (0.024 in.) thickness gauge between
the throttle stop screw and stop lever.
(d) Connect the test probe of an ohmmeter to the termi±
nals IDL and E2 of the sensor.
(e) Gradually turn the sensor clockwise until the ohmmeter
deflects, and secure it with the 2 set screws. 3. INSPECT THROTTLE POSITION SENSOR
(a) Apply vacuum to the throttle opener.
(b) Insert a thickness gauge between the throttle stop
screw and stop lever.
(c) Using an ohmmeter, measure the resistance between
each terminal. 2. INSPECT THROTTLE VALVE
(a) Apply vacuum to the throttle opener.
(b) Check that there is no clearance between the throttle
stop screw and throttle lever when the throttle valve
is fully closed.
4. IF NECESSARY, ADJUST THROTTLE POSITION
SENSOR
(a) Loosen the 2 set screws of the sensor.
Clearance between
lever and stop screw
Throttle valve fully
open 0.50 mm (0.020 in.)
0.70 mm (0.028 in.)Between terminals
2.0 ± 10.2 k 2.3 k or less 0.2 ± 5.7 k
0 mm (0 in.)
2.5 ± 5.9 k Resistance
VTA ± E2
VTA ± E2IDL±E2IDL±E2
Infinity
VC ± E2
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±209
Page 260 of 4770
2. INSTALL THROTTLE BODY
(a) Connect the following hoses to the throttle body:
(1) Water bypass hose from water outlet
(2) Water bypass hose from water bypass pipe
(3) California:
Air hose from cylinder head
Except California:
Air hose from air tube THROTTLE BODY INSTALLATION
(See Components for Removal and Installation)
1. INSTALL IAC VALVE TO THROTTLE BODY
(a) Place a new gasket on the throttle body.
(b) Place a new gasket on the intake chamber, facing the
protrusion downward. (f) Recheck the continuity between terminals IDL and E2.
(b) install the IAC valve with the 4 screws.
Clearance between
lever and stop screwContinuity (IDL ± E2)
0.50 mm (0.020 in.)
0.70 mm (0.028 in.) No continuityContinuity
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±210
Page 261 of 4770

(c) Type A:
Install the throttle body with the 4 bolts.
Torque: 19 N±m (195 kgf±cm, 14 ft±lbf)
Bolt length:
A 45 mm (1.77 in.)
B 55 mm (2.17 in.)
(d) Type B:
Install the throttle body with the 2 bolts and 2 nuts.
Torque: 19 N±m (195 kgf±cm, 14 ft±lbf)
3. INSTALL AIR CLEANER CAP, RESONATOR AND
AIR CLEANER HOSE
(a) Connect the air cleaner hose to the throttle body.
(b) Install the air cleaner cap together with the resonator
and air cleaner hose.
(c) California only:
Connect the air hose to the air cleaner hose.
(d) Connect the intake air temperature sensor connector.
4. A/T:
CONNECT AND ADJUST THROTTLE CABLE
5. CONNECT AND ADJUST ACCELERATOR CABLE
6. FILL WITH ENGINE COOLANT
7. CONNECT NEGATIVE (±) TERMINAL CABLE TO
BATTERY (e) Connect the following hoses to the throttle body:
(1) PCV hose
(2) 2 vacuum hoses from EGR vacuum modulator
(3) Vacuum hose from TVV (for EVAP)
(f) Connect the IAC valve connector.
(g) Connect the throttle position sensor connector.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±211
Page 262 of 4770
(b) Using SST, connect terminals TE1 and E1 of the data
link connector 1.
SST 09843±18020
(c) Maintain engine speed in the range between 900 ±
1,300 rpm for 5 seconds. Check that it returns to idle
speed.
If the engine speed operation is not as specified,
check the IAC valve, wiring and ECM.
ON±VEHICLE INSPECTION
1. INSPECT IAC VALVE OPERATION
(a) Initial conditions:
wEngine at normal operating temperature
wIdle speed set correctly
wTransmission in neutral position
IDLE AIR CONTROL (IAC) VALVE
(d) Remove the SST.
SST 09843±18020
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±212
Page 263 of 4770
2. INSPECT IAC VALVE RESISTANCE
(a) Disconnect the IAC valve connector.
(b) Using an ohmmeter, measure the resistance between
terminal + B and other terminals (ISCC, ISCO).
Resistance:
19.3±22±3W
If resistance is not as specified, replace the IAC valve.
(c) Reconnect the IAC valve connector.
COMPONENTS FOR REMOVAL AND
INSTALLATION
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±213
Page 264 of 4770
IAC VALVE INSPECTION
INSPECT IAC VALVE OPERATION
(a) Connect the positive (+) lead from the battery to
terminal +B and negative (±) lead to terminal ISCC,
and check that the valve is closed.
IAC VALVE REMOVAL
(See Components for Removal and Installation)
1. REMOVE THROTTLE BODY
(See steps 1 to 6 on pages EG1±207 and 208)
IAC VALVE INSTALLATION
(See Components for Removal and Installation)
1. INSTALL IAC VALVE
(a) Place a new gasket on the throttle body. (b) Connect the positive (+) lead from the battery to
terminal +B and negative (±) lead to terminal ISCO,
and check that the valve is open. 2. REMOVE IAC VALVE
Remove the 4 screws, IAC valve and gasket.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±214