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Home >> Chevrolet >> 1999 >> Prizm Base, Automatic, A131L/MB3 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Circuit Tests >> Electrical Load Idle-Up Circuit (1.8L) >> Circuit Description
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Circuit Description

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

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