VHX gauges and E38 ECM Speedometer output
VHX gauges and E38 ECM Speedometer output Has anyone when been able to get their VHX speedo to work with a E38 ECM? I have a Speartech harness that pulls the speedo output from X1J1 pin 57. When I wire that directly to the VHX box (speed sender), I dont get any pulses. However when I have my HPTuners scanner connected via the OBDII port, the speed output displays perfectly on the scanner. Any suggestions? Thanks,
Rob
EDIT: I forgot to mention this is for a 6L80 and you can't use the Dakota Digital signal generator.
Rob
EDIT: I forgot to mention this is for a 6L80 and you can't use the Dakota Digital signal generator.
Last edited by Hart_Rod; Dec 20, 2013 at 09:10 PM.
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I believe HP gets the signal off the GMLAN wires. There is communication between the transmission TCM and the E38 and the VSS signal is part of it. Some have tapped into that wire with success. It did not work for me. Without looking it up I think pin 57 may be an input from wheel sensors.
I believe HP gets the signal off the GMLAN wires. There is communication between the transmission TCM and the E38 and the VSS signal is part of it. Some have tapped into that wire with success. It did not work for me. Without looking it up I think pin 57 may be an input from wheel sensors.
http://www.hptuners.com/forum/showth...one-of-the-OSS
I'm working with Dakota Digital trying to figure it out. I'm sure it's something simple, either in the TUNE or something on the control box. I know I shouldn't worry about this, but it makes doing the tune a lot easier when you can see how fast you are going from the gauges and not having to look at the laptop....
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Update: I looked up my notes and I did add a yellow/black wire to pin 57 of J1. I also have checked the "serial" output on HP Tuners in the speedometer section. Car is still at the paint shop so I can't physically look at it. I will check it out when I get the car back. Seeing as I have to 2011 Corvette tune this might work.
Last edited by 1989GTA; Dec 20, 2013 at 08:41 PM. Reason: wording
Update: I looked up my notes and I did add a yellow/black wire to pin 57 of J1. I also have checked the "serial" output on HP Tuners for the speedometer section. Car is still at the paint shop so I can't physically look at it. I will check it out when I get the car back. Seeing as I have to 2011 Corvette tune this might work.
Rob
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Last edited by Hart_Rod; Dec 20, 2013 at 09:08 PM.
Update: I looked up my notes and I did add a yellow/black wire to pin 57 of J1. I also have checked the "serial" output on HP Tuners in the speedometer section. Car is still at the paint shop so I can't physically look at it. I will check it out when I get the car back. Seeing as I have to 2011 Corvette tune this might work.
. So that leaves the wire or the tune. I did a continuity check on the wire and double checked the pin location and all checked good. Now I just need to find an oscilloscope and see if the computer is putting out the correct signal on the wire..... 
I used Autometer gauges my harness was originally wired to use a signal out of the TCM, but it wouldn't work. I had to tap directly into the VSS signal coming directly out of the trans for it to work. I would have to look at my notes to see if it was the hi or low signal, but I try them both, separately, and see if it helps. I also notice the PPM setting in HP Tuners had no bearing on how the speedo functioned.
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Rocketrod: I tried that with my Speedhut speedometer and that did not work. I tapped off the high signal. Apparently it works with the Autometer gauges.
I do have a solution as I bought a Speedhut speedometer that works with the GMLAN wires. However I want to play with this and see if I can get it to work on the standard gauge. I am using the X1-57 pin.
Ok guys, I finally got the solution for the problem.
Chris - I downloaded the new version and made the changes - you da man!!! The speedo now works correctly!!! Thanks again,
Rob
please post up your tune so I can take a look or email me chris at hptuners.com
Hi Rob,
Please download the latest 2.24.469 or later.
I have added a new parameter to the speedo section called “Speed Output Type”, try setting this to “VehSerial”.
This parameter is used by the ECM hardware driver to initialize the output correctly.
Please let me know if it works.
Chris…
Hi Rob,
Please download the latest 2.24.469 or later.
I have added a new parameter to the speedo section called “Speed Output Type”, try setting this to “VehSerial”.
This parameter is used by the ECM hardware driver to initialize the output correctly.
Please let me know if it works.
Chris…
Rob
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I can still put the old one back in I guess as it is still apart. I would rather use the signal out of the ECM. That way I can use HPTuners and without messing up the speedometer. What do to, what to do? Last edited by 1989GTA; Feb 9, 2014 at 08:54 PM.
Just as I tore my dash appart to put in the Speedhut speedometer that uses the GMLAN signals. I can still put the old one back in I guess as it is still apart. I would rather use the signal out of the ECM. That way I can use HPTuners and without messing up the speedometer. What do to, what to do?
I can still put the old one back in I guess as it is still apart. I would rather use the signal out of the ECM. That way I can use HPTuners and without messing up the speedometer. What do to, what to do? TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
Ok, just down loaded the latest version. Went to speedometer setup and it has for "output source" the following :
1. Disabled
2. Rep TOS
3. Serial.
I assume number 3 (serial) is the one to use with this latest version of HPTuners? Thank you for getting to the bottom of this problem.
Edit: By the way the latest version is now 2.24.476.
1. Disabled
2. Rep TOS
3. Serial.
I assume number 3 (serial) is the one to use with this latest version of HPTuners? Thank you for getting to the bottom of this problem.
Edit: By the way the latest version is now 2.24.476.
Last edited by 1989GTA; Feb 9, 2014 at 09:35 PM.