On-Vehicle Inspection
1. INSPECT IDLE AIR CONTROL (IAC) VALVE OPERATIONInitial conditions:
- Engine at normal operating temperature.
- Idle speed checked correctly.
- Transmission in neutral position.
- A/C switch OFF.
- Using SST 09843-18020 or equivalent, connect terminals TE1 and E1 of the DLC1.
- 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.
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 0hms
Hot: 21.5 - 28.5 0hms
- 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 checked correctly.
- Transmission in neutral position.
- A/C switch OFF.
- Using SST 09843-18020 or equivalent, connect terminals TE1 and E1 of the DLC1.
- 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.