Chrismac Posted April 10, 2021 Report Share Posted April 10, 2021 Hey guys. I’ve been trying to get launch control working on my skyline but can not get a wheel speed signal for it to turn off. I placed the car up on jackstands and and put it in gear. My dash reads about 10kms in gear but for the life of me I can not get the link g4+ to read kms no matter what I do.it seems there all turned off. Anyone know a way to get this to work? Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 11, 2021 Report Share Posted April 11, 2021 As far as I know the speed signal comers from the speedo and is a square wave so should work from low speed. Can you attach your map. Quote Link to comment Share on other sites More sharing options...
chris mac37 Posted April 11, 2021 Report Share Posted April 11, 2021 ya it should be working out of the box lol heres my current saved file mar14 2021 update.pclr Quote Link to comment Share on other sites More sharing options...
chris mac37 Posted April 12, 2021 Report Share Posted April 12, 2021 On 4/11/2021 at 2:28 AM, Adamw said: As far as I know the speed signal comers from the speedo and is a square wave so should work from low speed. Can you attach your map. Map attached Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 12, 2021 Report Share Posted April 12, 2021 Your map is fine. You will have to get someone to check the wiring in the car to find where the signal is lost. Speed signal should be present on pin 29. The speed signal voltage needs to rise above 1.5V and fall below 1.0V. Quote Link to comment Share on other sites More sharing options...
chris mac37 Posted April 12, 2021 Report Share Posted April 12, 2021 17 minutes ago, Adamw said: Your map is fine. You will have to get someone to check the wiring in the car to find where the signal is lost. Speed signal should be present on pin 29. The speed signal voltage needs to rise above 1.5V and fall below 1.0V. Ok I’ll pull it apart to have a look. Thanks. Quote Link to comment Share on other sites More sharing options...
chris mac37 Posted April 13, 2021 Report Share Posted April 13, 2021 22 hours ago, Adamw said: Your map is fine. You will have to get someone to check the wiring in the car to find where the signal is lost. Speed signal should be present on pin 29. The speed signal voltage needs to rise above 1.5V and fall below 1.0V. Hey so I did some poking around and pin 29 has no wire in it. From the ecu Pinout I got it looks like pin 58 is a signal wire. (Signal 1) or do I have to run a wire from my cluster to the ecu to pin 29? I wonder if this is part of the reason why most of us can’t get launch control to work on our cars lol the car was originally an rb25det neo automatic but was converted to manual tranny and original engine harness was still used just the tranny harness was changed in the conversion Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 13, 2021 Report Share Posted April 13, 2021 Yeah, according to our notes pin 58 is the auto trans shaft speed. Since our ecu doesnt support the auto trans that pin is not connected. I dont know for sure but I suspect that wire still doesnt have any connection to the speedo. You could try moving the wire from pin 58 to pin 29 and see if you get any signal from it. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted April 13, 2021 Report Share Posted April 13, 2021 1 hour ago, chris mac37 said: Hey so I did some poking around and pin 29 has no wire in it. From the ecu Pinout I got it looks like pin 58 is a signal wire. (Signal 1) or do I have to run a wire from my cluster to the ecu to pin 29? I wonder if this is part of the reason why most of us can’t get launch control to work on our cars lol the car was originally an rb25det neo automatic but was converted to manual tranny and original engine harness was still used just the tranny harness was changed in the conversion As a side note to this I manual converted an RB25de S2 stagea (Grey plug ECU because Stagea and the pinout all matched up to the NEO motors) and I did have a wire in pin 29 which was the speed signal from the dash. My speed signal wire was yellow with a green stripe. Quote Link to comment Share on other sites More sharing options...
chris mac37 Posted April 13, 2021 Report Share Posted April 13, 2021 19 minutes ago, Vaughan said: As a side note to this I manual converted an RB25de S2 stagea (Grey plug ECU because Stagea and the pinout all matched up to the NEO motors) and I did have a wire in pin 29 which was the speed signal from the dash. My speed signal wire was yellow with a green stripe. Thanks. My gauge cluster was swapped to the manual one So I’ll pull it out and run a wire from cluster to ecu. I’ll also try swapping pin 58 to 29 and see if it works as well Quote Link to comment Share on other sites More sharing options...
Vaughan Posted April 13, 2021 Report Share Posted April 13, 2021 1 minute ago, chris mac37 said: I’ll also try swapping pin 58 to 29 and see if it works as well I ended up pulling apart most of my body loom to rewire things and from memory that output shaft speed one came through one of the 3 auto plugs attached to the rhs fender just above the chassis rail in front of the strut tower. That means if you don't your speed signal being fed into that plug where the auto box loom plugged into you won't have any speed signal coming through that ECU pin. Quote Link to comment Share on other sites More sharing options...
chris mac37 Posted April 14, 2021 Report Share Posted April 14, 2021 2 hours ago, Vaughan said: I ended up pulling apart most of my body loom to rewire things and from memory that output shaft speed one came through one of the 3 auto plugs attached to the rhs fender just above the chassis rail in front of the strut tower. That means if you don't your speed signal being fed into that plug where the auto box loom plugged into you won't have any speed signal coming through that ECU pin. Ok I’ll check that out. My Speedo works in the cluster so I would assume it is plugged in. Just no signal wire from the cluster to ecu Quote Link to comment Share on other sites More sharing options...
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