Trying to locate ECM on1993 c1500 - 1993 Chevrolet C1500

On this truck its called a pcm not ecm, they now call it a power train control module, this is located on the rightside of the dash above the heater box, hope this is helpful,

1993 Chevrolet Truck C1500 the Engine Control Computer is located: Front seating area, passenger side, behind dash, above blower motor, mounted on firewall

Hope helps (remember to rate and comment this).