Air Control Valve Operation
WARNING: This page is about a different car, the 1995 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to normal operating temperature. Start engine and run at idle. Using jumper wire, ground terminal 4N at ECM connector. See PIN VOLTAGE CHARTS article for terminal identification.
- If engine idles rough, air control valve and switching valve solenoid are okay. See Figure . If engine does not idle rough, check vacuum routing, switching valve solenoid, air pump and air control valve.