On-Vehicle

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. 1,000 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
SST 09843-18020
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 set 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 air pipe, and block off the IAC valve exit and the entry to the pipe.
- 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 pipe and injector.
- Remove the SST from the DLC1.
SST 09843-18020
- Reconnect the air assist hose to the air pipe.