California Vehicles

IDLE AIR CONTROL (IAC) VALVE ON-VEHICLE INSPECTION
1. INSPECT IAC VALVE OPERATION.
- Initial conditions:
- Engine at normal operating temperature
- Idle speed set correctly
- Transmission in neutral position



- Using a jumper wire (or SST 09843-18020), connect terminals TE1 and E1 of the data link connector, DLC1.
- After engine rpm is kept at 900 - 1,300 rpm for 5 seconds, check that it returns to idle speed.
- If the rpm operation is not as specified, check the IAC valve, wiring and ECM.
- Remove the jumper from DLC1.

2. INSPECT IAC VALVE RESISTANCE.

NOTICE:"Cold" and "Hot" in the following sentences express the temperature of the coils themselves.
"Cold" is from - 10°C (14°F) to 50°C (122°F).
"Hot" is from 50°C (122°F) to 100°C (212°F).

- Disconnect the IAC valve connector.

Idle Air Control Valve Terminals:

- Using an ohmmeter, measure the resistance between terminal +B and other terminals (RSC, RSO).

Resistance Cold: 17.0 - 24.5 0hms
Resistance Hot: 21.5 - 28.5 0hms

- If resistance is not as specified, replace the IAC valve.
- Reconnect the IAC valve connector.


OFF-VEHICLE INSPECTION

Components For Iac Valve Removal And Installation:

- REMOVE THROTTLE BODY.
- Refer to Service And Repair.
- Service and Repair

- REMOVE IAC VALVE FROM THROTTLE BODY.



- Remove the 4 screws, IAC valve and gasket.
- INSTALLATION HINT: Use a new gasket.

- INSPECT IAC VALVE OPERATION




- Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSC, and check that the valve is closed.




- Connect the positive (+) lead from the battery to terminal +B and negative (-) lead to terminal RSO and check that the valve is open.

- If operation is not as specified, replace the IAC valve.

- INSTALLATION IS IN THE REVERSE ORDER OF REMOVAL.