Duramax LBZ/LMM DSP5 User Guide
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Important DSP
5
Parameters and Tables
A9136, A9236, A9336, A9436
– DSP
5
switching voltages
These parameters set up the switching points for each DSP
5
program to become
enabled.
It works by the voltage from the switch for each tune needing to fall between each
adjacent parameter for a valid reading. So as an example only, if you set the
parameters like so
–
A9136 (DSP Program #1) = 4.00V
A9236 (DSP Program #2) = 3.00V
A9336 (DSP Program #3) = 2.50V
A9436 (DSP Program #4) = 1.80V
For the non DSP Program (stock) to become enabled the switch voltage must be
above 4.01V.
For DSP Program #1 to become enabled the switch voltage must be between
4.00V and 3.01V.
For DSP Program #2 to become enabled the switch voltage must be between
3.00V and 2.51V.
For DSP Program #3 to become enabled the switch voltage must be between
2.50V and 1.81V.
For DSP Program #4 to become enabled the switch voltage must be between
0.00V and 1.80V.
Check with your DSP
5
switch provider for the correct settings.
Monitoring DSP status in the Scantool
You can monitor the DSP switch data using the following PID’s –
GM.E35DSP2_DMA (PC) or E35DSP2_M (BBL):
This PID will show if the DSP
2
tune is enabled.
GM.E35DSP5_DMA (PC) or E35DSP5_M (BBL):
This PID will show the current
tune number the ECM is using for DSP
5
.
GM.E35DSP5V_DMA (PC) or E35DSP5V_M (BBL):
This will show the measured
voltage at the ECM pin when using DSP
5
, useful for setting up the DSP
5
switching
voltages, otherwise just use the previous PID to monitor the DSP
5
program
switching.
