Idle Up Control Valve: Adjustments

Idle Up Control Valve

The position of the Idle Air Control (IAC) valve can be checked using TestBook and adjusted if necessary through the by-pass screw in the plenum chamber. The bypass screw is covered by a tamper proof plug which can be extracted using a self tapping screw.

All vehicles:
1. Ensure air conditioning and all electrical loads are off Vehicle must be in neutral or park with air suspension in kneel and disabled.
2. Carry out tuning or base idle setting procedure as applicable using TestBook.