Install "Piggyback" controllers that intercept and modify signals.

For those working in the aftermarket or repair industry, the ECU pinout is the first document requested. It allows technicians to: Verify sensor health by probing the pins with a multimeter.

The pinout is the master key for any ECU. It is a schematic representation of every physical connection on the ECU’s external header. Each pin serves a dedicated purpose, and a single misplaced wire can lead to a fried processor or a non-starting engine. 1. Power and Ground