More info from John at TunerCat, many thanks to him and he said it's ok to pass this along.
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Auto Transmission Type:
Cal Value Definition
0 Freewheel
1 C2C
2 CVC
Drivetrain Type:
Cal Value Definition
0 Undefined
1 Front Wheel Drive
2 Rear Wheel Drive
3 Four Wheel Drive
A. Tach Type: This determines the format/source of the tach signal.
0 = Serial. In this case the tach information is provided over the CAN bus and there is no separate tach output.
1 = Frequency. This provides a frequency based tach output based on the Cam sensor.
2 = Crank. This provides a frequency based tach output based on the Crank sensor.
B. Tach Output High/Low Period. This just sets the number of reference pulses before the tach output signal changes state and id used to calibrate the tach.
C. Vehicle Speed 4K PPM Output. This sets whether the 4000 pulse per mile vehicle speed output is enabled and its source:
0 = Disables
1 = Speed Sensor. This indicates that the output is based on the signal from the speed sensor.
2 = Serial. This indicates that the output is based on speed data from the data bus.
D. Vehicle Speed Type. This specifies how the vehicle speed is output from the ECM.
0 = Wheel Speed
1 = Serial
2 = Rep TOS
The serial setting outputs the vehicle speed on the data bus. I believe the other two setting provide a frequency output but I'm not sure what the difference is.
E. Vehicle Speed Serial Data Format. If the vehicle speed is being output on the data bus, this parameter selects the data format.
0 = Class 2 (J1850 format)
1 = Early CAN
2 = Late Can
I'm not sure what the difference is between 1 & 2.
F. Vehicle Speed Sensor Configuration. This just indicates the configuration of the wheel speed sensors.
0 = All wheels
1 = Driven Wheels
2 = Non-driven Wheels
Not sure how the 'All Wheels' configuration is actually used.
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