Autometer speedo with gmpp trans controller
Thread Starter
Teching In
Joined: Apr 2008
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Autometer speedo with gmpp trans controller I went on the shakedown ride on my 67 camaro with gmpp LS3 and gmpp 4l60e with the gmpp trans controller. The autometer electronic speedo steals the vss signal from the trans controller. That makes the trans not shift... Unplug the signal to the speedo and car works great. Autometer says to add a resistor on the signal wire to their speedo. Doesnt work. I have worked with autometer and they dont have an answer now other than to add a dakota digital box??? Anybody else have this issue? I need this fixed asap for Power Tour.
TECH Regular
Joined: Jan 2004
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From: Austin, TX
Does your ECM not have a Speedometer output? I have never tied into the VSS, but directly to the ECM speedometer output. I know the Carb guys use the VSS, but I think most of the EFI guys use the ECM output.
Regards, John McGraw
Regards, John McGraw
There should be a speedo output from your ECM...but that is speaking strictly as something you take from a donor car. I am not very familiar with the GMPP set-up but my guess is that it is something in the way you wired it.
Can you describe how the wires are spliced in?
Thanks,
Dave
Can you describe how the wires are spliced in?
Thanks,
Dave
11 Second Club
Joined: Feb 2008
Posts: 317
Likes: 2
From: TN
I went on the shakedown ride on my 67 camaro with gmpp LS3 and gmpp 4l60e with the gmpp trans controller. The autometer electronic speedo steals the vss signal from the trans controller. That makes the trans not shift... Unplug the signal to the speedo and car works great. Autometer says to add a resistor on the signal wire to their speedo. Doesnt work. I have worked with autometer and they dont have an answer now other than to add a dakota digital box??? Anybody else have this issue? I need this fixed asap for Power Tour.
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Thread Starter
Teching In
Joined: Apr 2008
Posts: 48
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There should be a speedo output from your ECM...but that is speaking strictly as something you take from a donor car. I am not very familiar with the GMPP set-up but my guess is that it is something in the way you wired it.
Can you describe how the wires are spliced in?
Thanks,
Dave
Can you describe how the wires are spliced in?
Thanks,
Dave
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Thread Starter
Teching In
Joined: Apr 2008
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i was looking at this old thread. autometer has a problem with their speedo taking the signal from the tcm and ecm. they will tell you to try a resistor,etc. it wont work. get the dakota digital box and it is done.
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11 Second Club
Joined: Feb 2008
Posts: 317
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From: TN
I went on the shakedown ride on my 67 camaro with gmpp LS3 and gmpp 4l60e with the gmpp trans controller. The autometer electronic speedo steals the vss signal from the trans controller. That makes the trans not shift... Unplug the signal to the speedo and car works great. Autometer says to add a resistor on the signal wire to their speedo. Doesnt work. I have worked with autometer and they dont have an answer now other than to add a dakota digital box??? Anybody else have this issue? I need this fixed asap for Power Tour.
Back in 2008 when I started LS3 with 4L65E, I found that out the hard way. Might want to check with RPM transmissions as I've heard they are one of the cheapest places to get a 4L60/65 modified with sensor. This may mean your TCM and/or harness could also be a problem if it's not compatible with 4L70E as well as 4L60E
You might want to disconnect the main harness connector to transmission and see f you can count the number of pins in connector and then maybe by using inspection mirror, count the number in connector in trans. What you are looking for is in below picture. The two extra pins provide VSS information to ECM.
You might want to check with any of the Companies that make wire harnesses for LS engines swaps and see if what I'm telling you is correct when doing LS3 swap with 4L60/65E.
We just finished a '68 Camaro LS3 with a TCI controlled 4L80. The owner tried getting a signal from the TCI box output to run his Autometer speedo. Trouble is, the speedo is looking for a 5v square-wave and the TCI box only outputs a 12v square-wave. We ended up teeing the signal wire into the TOSS sensor signal (5v sq) that goes to the TCI box...
