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Mouse Free Navigating – Often it is easier to not use the mouse when operating a laptop. The C950 software can be
operated without the use of a mouse. From the main window, press “Alt” and then the underlined letter of the window or menu
you want to open (i.e. press “Alt” and then “F” to open the “file menu”). Different locations can be navigated by pressing the
“Tab” key. When in any of the windows with tables (such as the fuel and spark tables), it is easier to use the arrow keys, so
you can move quickly to the exact spot you want. To exit a window, press the “Esc” key. When making changes, the new
value isn’t actually sent until you move off the cell you are working on or press the “Enter” key.
Making Changes to Multiple Cells at Once – In the fuel and spark maps, changes to entire sections of the maps can be
made via “cell action” feature. Using the mouse, click on a cell in the area that you wish to modify. Next, click on the
diagonally opposite cell. The cells in this region will be highlighted in yellow and a small window will appear. Type the
operation that you wish to perform (+ for addition, - for subtraction, * for multiply, / for divide, and % for adding or subtracting
a percentage) and the value you wish to modify the cell amount. For example, by typing a “+10”, the ten units will be added to
all of the highlighted cells. Typing a “*1.2” would multiply all the highlighted cells by 1.2. This feature is very helpful and
should be used when needed.
6.4 Base Maps
Base maps are supplied. Choose the one that is closest to your application. If one does not seem to work well, choose
another. You will always have to perform additional tuning for the vehicle to operate best. That is the benefit of
programmable EFI. This tuning may be small changes or large changes, depending on your engine and vehicle. There is a
disk supplied with base maps. There is also an additional sheet supplied that describes what these are for. New base maps
can be found on the Holley website (www.holley.com). These are self-extracting zip files. Save them to a directory and
double click on them. This will unzip them and allow them to be loaded to the ECU. See the information above on sending
these maps to the ECU.
6.5 Advanced and Beginning Users
Not all screens may look exactly like they are shown in the manual. Some variables are considered too advanced for the first-
time user and are not needed until the tuning process is nearly complete. These variables have been hidden from view.
When you are ready to adjust these parameters (and you may never need to use them), go to “About” and then “Version”.
Check the “Advanced User” box and all variables will be visible.
7.0 STEP-BY-STEP INITIAL STARTUP INSTRUCTIONS
At this point you should have the mechanical installation complete. The Commander 950 software should be installed in the
laptop (Section 6.1) you will use for tuning. The next section is the first attempt to start the engine. Base maps are included
for different engine combinations. If the base map is close to your application, then the vehicle should fire and run. If the
base maps that you try will not start and allow the engine to keep running, detailed tuning information is included in the Step-
by-Step Basic Tuning (Section 8.0).
1. ¨ CHECK FUSES/RELAYS
Make sure the 15 amp fuse is installed in the fuse holder in the main red power wire which is located near the ECU.
Make sure the relay is installed in the relay holder.
2. ¨ CONNECT COMPUTER CABLE
Connect the communications cable to the serial communications port on the computer and to the round connector on
the main harness near the ECU.
3. ¨ PRIME FUEL SYSTEM
Turn the ignition key to “Run”, not start. You should hear the fuel pump energize for about 5 seconds, then shut off.
This allows for the pump to pressurize the fuel system. When the vehicle is starting and runs, the pump will turn
back on. If you do not hear the pump turn on when the key is turned on, see the troubleshooting section-Appendix 4.
After the pump is energized, check the entire fuel system for leaks. You can shut the key off, wait about 10 seconds,
then turn it back on to re-energize the pump. It takes 10 seconds in the key “Off” position for the ECU to reset. You
may have to do this several times if the entire fuel system is dry. When the system is pressurized, you can hear the
speed of the pump slow down. You will also see the pressure come up on a fuel pressure gauge.
4. ¨ CHECK FUEL PRESSURE
Do an initial check of the fuel pressure when the key is turned on. See the hardware installation manual for
information on installing a fuel pressure gauge on your particular system. It is critical that the pressure be
checked and adjusted. The recommended base setting for Multi-port systems is 44 psi +/-2 psi and Throttle Body
Injection systems is 21 psi +/-1 psi. Again, you may need to energize the pump a few times if the fuel system is dry.