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Home >> Isuzu >> 1997 >> Trooper LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Fuel System >> Idle Control System >> Idle Air Control (IAC) Valve

Idle Air Control (IAC) Valve

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NOTE: Functional testing of Idle Air Control (IAC) valve requires a bidirectional scan tool capable of cycling PCM output devices or a special IAC Driver and Noid Light Set (222L or J-37027).
  1. Disconnect harness connector to motor. Check resistance across IAC coil terminals "A" to "B" and "C" to "D". Resistance should be 40-80 ohms. If okay, go to next step. If resistance is not as specified, replace IAC valve.
  2. Check resistance between IAC terminals "B" to "C" and "A" to "D". Resistance should be infinite. If resistance is not as specified, replace IAC valve. See Fig 1 .
Fig 1: Identifying Idle Air Control (IAC) Connector Terminals.
G96B10109Courtesy of ISUZU MOTOR CO.
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