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Diagnostic Aids

Desired idle speed is based upon a look-up table built into PCM memory. This includes anything which requires an idle speed boost. Desired idle speed can be determined using a scan tester. Cruise cable misadjustment may cause a high idle due to throttle plates being held open. Inspect IAC valve for dragging, binding and plugged passages.

Fig 1: Code 35 Schematic (Saturn) IAC Idle Speed Error

Fig 2: Code 35 Flow Chart (Saturn) IAC Idle Speed Error