Idle Speed/Throttle Actuator - Electronic: Service and Repair

Throttle Body Components:

IDLE AIR CONTROL (IAC) VALVE REMOVAL
1. Disconnect Negative (-) terminal cable from battery




CAUTION: Wait at least 90 seconds after the ignition switch is turned to the LOCK position and the negative (-) terminal cable is disconnected from the battery to begin work.

2. Drain Engine Coolant

3. Remove air cleaner Cap



(a) Disconnect the following connector, cord, cables and hoses:
(1) Intake air temperature (IAT) sensor connector
(2) California only: high-tension cord from air cleaner hose
(3) Accelerator cable from clamp
(4) Cruise control actuator cable from clamps
(5) California only: Air hose for idle-up from air cleaner hose
(b) Disconnect the 4 clamps, and disconnect the air cleaner cap from the air cleaner case.
(c) Loosen the hose clamp, and disconnect the air cleaner hose from the throttle body.
(d) Remove the air cleaner cap and air cleaner hose assembly.

4. Disconnect control cables from throttle body




(a) Disconnect the following cables:
(1) Accelerator cable
(2) A/T throttle control cable
5. Remove throttle body



(a) Disconnect the following connectors:
(1) Throttle position sensor (TPS) connector
(2) Idle air control (IAC) valve connector



(b) Disconnect the following hoses:
(1) Vacuum hose (from upper port of TVV for EVAP) from port "P" of throttle body
(2) Vacuum hose (from port "Q" of EGR Vacuum Modulator) from port "E" of throttle body
(3) Vacuum hose (from port "R" of EGR Vacuum Modulator) from port "R" of throttle body
(4) PCV hose (from cylinder head) from throttle body



(c) Type A:
- Remove the 4 bolts.
(d) Type B:
- Remove the 2 bolts and 2 nuts.
(e) Disconnect the throttle body from the intake manifold.
(f) Remove the gasket.
(g) 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 Intake Manifold) for air assist system
(4) Except California:
Air hose (from air tube) for A/C and PS idle-up.

6. Remove IAC Valve



- Remove the 4 screws, IAC valve and gasket.


IAC VALVE INSTALLATION




1. Install IAC Valve.
(a) Place a new gasket on the throttle body.



(b) Install the IAC valve with the 4 screws.

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 Intake Manifold) for air assist system
(4) Except California: Air hose (from air tube) for A/C and PS idle-up



(b) Attach a new gasket to the intake manifold, with the protrusion facing downward.




(c) Type A:
Install the throttle body with the 4 bolts.
Torque: 19 Nm (14 ft lb)
HINT: Different bolt lengths are used for the upper and lower sides.
Bolt length:
Upper side: 45 mm (1.77 in.)
Lower side: 55 mm (2.17 in.)

(d) Type B:
Install the throttle body with the 2 bolts and 2 nuts.
Torque: 19 Nm (14 ft lb)
(e) Connect the following hoses:



(1) Vacuum hose (from upper port of TVV for EVAP) to port "P" of throttle body
(2) Vacuum hose (from port "Q" of EGR vacuum modulator) to port "E" of throttle body
(3) Vacuum hose (from port "R" of EGR vacuum modulator) to port "R" of throttle body
(4) PCV hose (from cylinder head) to throttle body



(f) Connect the following connectors:
(1) Throttle position sensor connector
(2) IAC valve connector

3. Connect control cables To throttle body.
Connect the following cables:



(1) Accelerator cable
(2) A/T throttle control cable

4. Install air cleaner cap.



(a) Connect the air cleaner hose to the throttle body.
(b) Install the air cleaner cap to the air cleaner case with the 4 clamps.
(c) Tighten the hose clamp.
(d) Connect the following connector. cord, cables and hoses:
(1) IAT sensor connector
(2) California only: High-tension cord to air cleaner hose
(3) Accelerator cable to clamp
(4) Cruise control actuator cable to clamps
(5) California only: Air hose for idle-up to air cleaner hose

5. Fill engine with coolant.

6. Connect negative (-) terminal cable to battery.