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Home >> Pontiac >> 1998 >> Firefly 2D Hatchback, 1.3 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 1.0L >> Circuit Tests >> Electrical Load Idle-Up Circuit >> Circuit Description
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Circuit Description

Powertrain Control Module (PCM) receives an idle-up signal from diode module. This signal is present whenever one or more of the following systems is turned on or operated:

Idle Speed Control (ISC) motor will increase throttle valve opening and engine RPM will slightly increase to compensate for additional electrical load.

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