1227727 does not read VSS

[S3TPI]

I did a TPI conversion on my truck, and it runs fine. I bought a VSS from JTR, and it will not read the vehicle speed in Tunerpro. I tested the VSS on a freq counter, and it shows varying AC voltages and frequencies when spun by a drill. I checked continuity from the VSS connector to C2 and C8 on the ECM plug, and it was good. I am using SAUJP 305 bin I downloaded from the Moates files on this site. Is it possible speed sensor bits are set wrong? I do not know which ones should be set for normal operation. Current configuration:
Bit 0: not set
Bit 1: not set
Bit 2: not set
Bit 3: set
Bit 4: set
Bit 5: not set
Bit 6: not set
Bit 7: set
Thanks for any advice!
Gary

[dave w]

Anything connected to D11 (Park / Neutral)?

dave w

[S3TPI]

No, Park/Neutral is not connected.

[JeepsAndGuns]

I had this problem once. Try disconnecting the wires from C2 and C8, connect one wire from the VSS to ground, then hook the other to pin to B21. There is a flag for magnetic VSS installed. I can not remember if it needs to be checked or unchecked. Try both, one should work.

We start talking about it a little on the 2nd page here: http://www.gearhead-efi.com/Fuel-Injection/showthread.php?1590-A-few-random-8D-questions&highlight=1227730

[S3TPI]

Would that be bit 6? They are not too descriptive in Tunerpro, but that is the only one that is identified as MAG.

[JeepsAndGuns]

Not sure what XDF your using, but the one I have says magnetic VSS installed. Looks like the address is 0x18 bit 6

[S3TPI]

The XDF I'm using is 8d_v03. I changed bit 6 (mag) to set, and it worked! Thanks!!

[JeepsAndGuns]

No problem. Glad I could help. :happy: