Banks Power Chevy_GMC Trucks: Duramax LB7 (Diesel ’01 - 04 6.6L) Tuner- Six-Gun Diesel Tuner with optional Speed-Loader Module '01-04 For use with Six-Gun Switch - Manual (Page 20)

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When the vehicle engine is cold, the
Six-Gun module initiates an internal
warm up sequence that takes about
60-seconds to complete. During this
60-seconds, you will not see any
performance gains to your vehicle.
If you feel that your Six-Gun Diesel
Tuner is not functioning properly, some
diagnostics can be performed. Your
Six-Gun Diesel Tuner is equipped with
diagnostic features that will detect and
display certain errors. Remove the Six-
Gun Diesel Tuner from its mounting
location while keeping all connectors
plugged in. Turn vehicle key to ON
position. Observe the two LEDs
mounted on the upper corners of the
black connector on the end of the Six-
Gun Diesel Tuner. If all wire
connections are correct, a steady
green light is illuminated. If the green
light is not illuminated when key is on,
check power supply hookup and the
fuse on the Six-Gun main wire
harness. If connection and fuse are
okay, contact Banks Technical Service.
If a connection is incorrect or if there
is a problem with the system, when
the key is on the red LED will flash in
sequence to identify a diagnostic code.
A Six-Gun Diesel Tuner’s diagnostic
code is comprised of 2 digits. Each
code is expressed in a sequence of 2
sets of the flashing red LED separated
by a brief flashing of the green LED in
between. Each set of a number of red
LED flashes represents a digit. A longer
flashing of the green LED separates
the sequences. The LEDs will continue
to flash to display all the errors, and
then repeat.
Table 1 lists some
common diagnostic codes.
For example, if a faulty thermocouple
is detected (code “2,3”) by the Six-Gun
Diesel Tuner, the following red and
green LED flashing sequence is
observed when the key is on:
(1) Two times flashing RED LED
(2) One time quick flashing GREEN LED
(3) Three times flashing RED LED
(4) One time longer flashing GREEN LED
The above flashing sequence will
repeat continuously. When the
problem is corrected, the diagnostic
code will be eliminated and replaced
by a steady green light.
Note: If multiple codes are set, they will
be displayed in a series separated by the
longer flashing green LED. When reading
codes, make sure to watch the entire
series until you see the first code repeat.
Note: The “4,3” code comes on when the
Six-Gun Diesel Tuner module is first
installed on a vehicle. To eliminate this
code, follow the instructions described in
the “LEARNING TRANSMISSION” section.
If problem persists, contact Banks
Technical Service.
If the Six-Gun Diesel Tuner should ever
need to be removed from the vehicle,
the system includes a by-pass plug
that must be connected to the white
8-pin connector (next to the 10-pin
connector) on the Banks wire harness.
Failure to utilize the by-pass plug will
result in a “Check Engine” light on the
dash and a Diagnostic Trouble Code
being stored in the factory computer
and the engine will not start.
If the Speed-Loader is removed from
the vehicle, perform
Steps A1 to A4
on page 18.
-END, SECTION 7-
Section 7
TROUBLESHOOTING