Non-Fault Code Testing

Checking ISC Operation:

Check For Operating Sound From ISC Valve
- Check that there is a clicking sound immediately stopping the engine.

ISC Connector Identification:

Inspect ISC Valve Resistance
- Disconnect the ISC valve connector.
- Using an ohmmeter, measure the resistance between terminals B1 - S1 or S3, and B2 - S2 or S4.

Resistance:
B1 - S1 or S3: 10 - 30 Ohms
B2 - S2 or S4: 10 - 30 Ohms

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

No. 5 Air Hose:

Inspect Air Assist System
- Start and warns up the engine.
- Disconnect the No.5 air hose from the ISC valve and plug the hose end with your finger.
- Check that vacuum pressure acts against your finger.

Reference vacuum:
27 kPa (200 mmHg, 7.9 in.Hg) or more

- If no vacuum exists, check whether the air hose, pipe is clogged.