B-4 Idle Air Control System

B-4 Idle Air Control System Check

NOTE: IAC duty can be checked by using analog type voltmeter with high impedance (M.ohms/V minimum), although not accurate. IAC duty to voltage relation is as follows.
- "OFF DUTY METER" is such duty meter that indicates approx. 100% when terminal voltage is approx. "OV".
- "VB" represents battery voltage while engine of vehicle being checked is running.