CRC-1000 Dakota Digital DBW Cruise and a GMPP LT4

[randy]

Where are you pulling your speed signal? I had to use the signal from the transmission harness connector on the gmpp ecu. Speed signal wasn’t accurate since we didn’t use the 40 tooth transmission. We flashed the ecu with a tire and reluctor conversion to trick the ecu speed and now everything is perfect

[stan65]

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