Thread: CRC-1000 Dakota Digital DBW Cruise and a GMPP LT4
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Old 10-03-2023, 10:59 AM
stan65 stan65 is offline
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Final conclusions.....

After extensive testing, my conclusion is the GMPP ECU does not transmit the data on the bus unless its polled. Without the TCM in a manual transmission application there is nothing to poll the ECU. When the HPTuners dongle is attached to the ALDL connector, it is polling for data and therefore the Cruise control works.


The solution I opted for is to add a second ALDL connector to the bus and attach a used cheap HPTuners dongle to the extra port. (Yes I can have 2 Hptuners dongles attached to the car at the same time to continue to tune)

I didn't want to leave my "good" dongle in the car.

Thanks,
Stan
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