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Home >> Cadillac >> 1993 >> Allante >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Self-Diagnostic System >> Status Lights >> PCM Operating Mode

PCM Operating Mode

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The PCM operating mode is indicated by the "Auto" symbol on the ECC panel. The PCM is in "Closed Loop" when the "AUTO" symbol is on. The PCM is in "Open Loop" when the "AUTO" symbol is "OFF".

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