Establishing a connection, Establishing_a_connection – Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI (LS1) System Hardware & BigComm Software User Manual
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BigStuff3 Pro SEFI System (LS1)
Version 1.0
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12. Establishing a Connection
The sequence for connecting the GEN3 ECU to the Main Wire Harness is as follows:
• First connect battery terminals.
• With the ignition switched off, connect the 30-way header connector, with terminals A-K
to the ECU.
• After terminals A-K are connected to the ECU, connect the header connector with
terminals L-Y.
This assembly sequence should preserve the firmware and initial calibration that was loaded in at
the factory.
Assuming that the system wire harnesses, ECU and software are all installed and connected
correctly, the next step is to establish communication between the PC and BigStuff3 GEN3 ECU.
Double check to make sure the communication cable connections, between the PC and to the
GEN3 ECU, are securely in place. Again, the plastic Packard style connector mates with the
main wire harness connector labeled “Calport”. Turn the PC on and power up the BigComm
ECU by turning the vehicle ignition to the “Run” position.
Left mouse click (double click) the BigComm icon on the Windows desktop.
The following screen will appear.
Once communication has been established, the BigComm “Main Menu” screen will open and the
in the tool bar will become active.