Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

1. INSPECT IAC VALVE OPERATION.
- Initial conditions:
- Engine at normal operating temperature.
- Idle speed check correctly.
- Transmission in neutral position.
- A/C switch OFF.





- Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
- After engine speed is kept at approx. 1000 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.
- Remove the SST from the 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) and
"Hot" is from 50°C (122°F) to 100°C (212°F).

- Disconnect the IAC valve connector.





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

Resistance:
Cold: 17.0 - 24.5 Ohms
Hot: 21.5 - 28.5 Ohms

- If resistance is not as specified, replace the IAC valve.
- Reconnect the IAC valve connector.
3. INSPECT AIR ASSIST SYSTEM.
- Initial conditions:
- Engine at normal operating temperature
- Idle speed check correctly
- Transmission in neutral position
- A/C switch OFF





- Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
- After engine speed is kept at 900 - 1,300 rpm for 10 seconds, check that it returns to idle speed.
- Stop the engine.





- Disconnect the air assist hose from the IAC valve, and plug it.
- Start the engine and check that the idle speed reaches 500 rpm or below (the engine may stall).
- If the idle does not reach 500 rpm or below, check for a leak between the air assist hoses, pipe and injectors.
- Remove the SST from the DLC1.
- Reconnect the air assist hose to the IAC valve.