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Home >> Geo >> 1997 >> Prizm Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 1.6 & 1.8L >> Circuit Tests >> Test C2-1: Electrical Load Idle-Up Diode Circuit Check >> Circuit Description

Circuit Description

Powertrain Control Module (PCM) receives an idle-up signal from electrical load idle-up diode.

This signal is present when one or more of the following systems is turned on or operated:

  1. Headlights or parking lights.
  2. Rear window defogger.
    NOTE: Before proceeding with this test, ensure rear defogger and headlights operate properly.
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