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What does pcm power relay mean on ford explorer 1996?

On a 1996 Ford Explorer, the PCM (Powertrain Control Module) power relay is a critical component that supplies power to the PCM itself. The PCM is the "brain" of the vehicle's engine and transmission control systems. If this relay fails, the PCM will not receive power, and the vehicle will likely not run or will experience significant drivability problems. Essentially, it's the switch that allows the PCM to operate.