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• 19:10, 6 July 2026 Cliff talk contribs created page Coolant temperature sensor (Created page with "'''Coolant temperature sensor''' refers to the engine coolant temperature sensor used by the Pontiac Fiero ECM. The coolant temperature sensor tells the ECM how warm the engine is. The ECM uses this information for fuel mixture, idle control, cold-start enrichment, warm-up behavior, closed-loop operation, and diagnostic trouble code decisions. == Overview == The coolant temperature sensor is one of the most important engine-management sensors on the Fiero. Wh...")