SXTune & Delta ECU Installation

This page describes how to install the SXTune software along with the wiring necessary to connect SXTune to the ECU. There is a description of the four sections in SXTune (Engine Calibration, Gauges, Scope and Config) as well as a more detailed description of the main parameter groups available under the Engine Calibration section. This page includes advice on trouble shooting the ECU,harness routing and engine sensors in addition to general information.

Installing SXTune

Installation Procedure

In order to successfully install SXTune (SXT) the PC should be running Windows 7, 8 or 10 and the following procedure followed:

1. Install all Windows updates. This is essential for the latest version of STX to install and operate correctly.

2. Download the latest version of SXTfrom the SCS website.



3. Log out of Windows and turn your PC off. This will ensure that you have no open processes, related to STX, which could lock a file.

4. Reboot your PC and log in as administrator. If you have a previous version of SXT installed, do not uninstall it. The new version will install over the top of the old version.

5. Double click on the file SXTune_Setup.exe. If you didn’t log in as administrator then right click on the file and choose run as administrator.

6. Click OK for the first window and in the second window choose your ECU from the drop-down list



7. Click through the rest of the dialogues in order to complete the installation..

Troubleshooting the Installation Process

Most installation problems are due to failure to update Windows to its latest version, not being logged in as administrator or already having a previous version of SXT started up and running whilst trying to install the latest version.


Interfacing SXT to ECU

Basic Requirements

  • Windows PC running Windows 7 or later.
  • CAN programming interface.
  • A separate programming lead (this may already be incorporated into the SCS engine loom) which must include a serial DB9 female connector (or your car’s OBD port instead of the DB9) to connect to the CAN interface and an AMPSEAL 35way female connector 776164-1.
  • 12 volt permanent supply (Battery)
  • Switched 12 volt supply (ignition switch)
  • Latest copy of SXTune software installed.

Programming Lead

A dedicated programming lead incorporating a switch (to simulate the ignition switch) and a 12 volt mains adapter can be used, as supplied by SCS. Alternatively, the programming lead can be wired using the car’s 12-volt supply and 12-volt switched ignition. The required connections for the D-SUB 9 way female connector and the AMPSEAL 35 female connector (776164-1) are shown in the table and two images below. NOTE: If you connect to the ECU via your vehicle’s OBD port then the D-SUB connector will not be required.







Importance of Permanent and Properly Switched Supply on the AMPSEAL 35

It is essential that the supply to pin 1 on the AMPSEAL 35 is a permanent supply, directly to (approximately) 12 volts, without passing through any type of switch. Pin 3 should also be a permananet quality connection to ground. It is also essential that the switched 12 volt supply on pin 2 is switched by a proper electrical switch (such as the vehicle's ignition switch) and not, for example, switched by touching a bare wire on to a battery terminal. A proper electrical switch allows the ECU to correctly debounce the signal when the switch is activated. Not having a good quality switch is likely to lead to erros when attempting to load firmware or a calibration file into the ECU.

Connecting the PC to the ECU

The supplied CAN interface is connected to the D-SUB 9 connector on the programming lead and to the PC via the supplied USB cable. The AMPSEAL 35 connector on the programming lead is connected to the ECU’s black coloured socket. In some cases the D-SUB9 connector will not be required and your connection will be made via your car’s OBD port. In this case you should have a lead with micro USB to OBD connectors which connects between the can interface and the OBD.