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Where is the tcm in a 91 talon tsi Auto?

In a 1991 Mitsubishi Talon TSI automatic, the Transmission Control Module (TCM) isn't a separate, easily identifiable box like in some vehicles. Instead, it's integrated within the main Engine Control Module (ECM). So you won't find a stand-alone TCM; the ECM handles both engine and automatic transmission control functions. The ECM is usually located under the dash or in the engine bay, often near the firewall. Consult your vehicle's repair manual for the precise location.