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Home >> Geo >> 1997 >> Metro Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests 1.0 & 1.3L >> Circuit Tests >> Test C1-2: A/C Idle-Up Circuit Check >> Circuit Description

Circuit Description

When A/C compressor clutch is in operation, A/C amplifier will send an A/C idle-up signal to PCM. PCM signals ISC motor which activates a plunger to open throttle plate. When throttle plate opens, engine idle speed increases, preventing rough idle or stalling.

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