Hi All.
BA 5.4 V8 AUTO OS:HABNCJ8
How do we get PCM to accept hall signal on speed input?
I see this topic has been started a number of times and remaining unresolved. There seems to be many people seeking an answer.
So I'm going back down this road.
Engine transplanted into another car. Running fine. No codes except VSS (vehicle speed sensor) related, which is explained below.
In the stock Falcon the PCM gets the VSS signal from the ABS unit.
Anyone know what the signal is? I know for sure it's not square wave or AC. I suspect dome kind of data?
Now the engine is transplanted, there is no ABS unit to send VSS signal to the PCM. So the typical procedure is to fit a hall effect sensor to the trans output shaft.
Last time I did a conversion such as this I used a competitors software to change the VSS source to accept a digital (hall) signal. So it can be done.
This time I would rather do it with HPT SW.
I know the BA Falcon Ute with no abs has the stock configuration to support this, but I suspect the code change is outside the parameters HPT can currently modify?
Please, someone tell me it's possible with HPT.
Someone suggested toggling SPEEDO>GENERAL>VSS OUT VIA SCP
And I did try this with no success, but USE VID was enabled so maybe USE VID should have been disabled to enable the SCP change?
Does it really need a VSS? YES, the trans won't shift and wants to stay in 3rd gear without it. I don't think there is a way to fudge the shifting without the VSS - anybody??
PS: I have emailed support about this, but 2 weeks later I'm still in the dark.
Any comments appreciated. Can supply stock file if required...