Cartwaveforms > actuators > idle speed control valve > Idle Speed Control Valve (Electromagnetic)
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Idle Speed Control Valve (Electromagnetic) Waveform Notes
The Electromagnetic Idle Speed Control Valve (ISCV) will have 2 electrical connections, with a voltage supply at battery voltage and a switched earth path. The rate at which the earth path is switched is determined by the Electronic Control Module (ECM) to maintain a prerequisite speed according to its programming. The valve will form an air by-pass around the throttle butterfly, to form a controlled air bleed within the induction tract. If the engine has an adjustable air by-pass and an ISCV, it may require a specific routine to balance the two air paths.
As the example waveform shows the earth path is switched and the resultant picture is produced. Probing onto the supply side will produce a straight line at charging voltage and when the earth circuit is monitored a ‘saw tooth’ waveform will be seen.
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