Duramax 6.6L LBZ/LMM
DSP5 User Guide
- 10 -
www.efilive.com
Installing a Hardwired switch
Wiring the DSP
5
Switch
The DSP
5
switch works by selecting different voltages for the ECM to measure,
from these voltages the ECM can determine which program you wish to run.
Below is the suggested resistance to be used for any DSP
5
switch you may wish
to design. Also shown is the approx. voltage the ECM will measure for each
resistance. The switching voltages are configurable within EFILive, however, the
values below give a good even separation of switch points.
The 0.1uF capacitor shown in red is optional, it is used to reduce switch bounce.
The connections to the ECM from the switch are made to the following pins
–
Signal = Connector 1 (the larger plug), pin 46,
(next to Grey wire-LBZ, Tan
wire-LMM)
.
Ground = Connector 1 (the larger plug), pin 54,
(next to Yellow/Black wire)
.
Note: It may be possible to make the ground connection in the cab rather than the ECM.
The part number for the connector pins is
– Tray #19, 1928498135.
