Evening all
I have a 14CUX ECU on my 3.9 Rover V8. I’ve had to do a little rewiring and have come a cropper.
I have a yellow wire leading to the ECU plug which I have traced to be pin 6 (Speed transducer). After doing some research I’ve worked out this is a variable voltage pulse signal to the ECU. My vehicle does not have or require any sort of speed sensor so I wondered what the importance of this signal was and if it can in any way be replicated.
Appreciate your time
Tom
14CUX PIN 6 Speed Transducer Input?
Moderator: phpBB2 - Administrators
- SimpleSimon
- Knows His Stuff
- Posts: 620
- Joined: Mon Apr 25, 2011 10:36 pm
- Location: East Sussex
I would try it without it just allows the idle speed to wind down progressively as you approach junctions etc and was incorporated for the top speed limiter when fitted to certain LR 4WD vehicles, some vehicles will run happy without this speedo pulse I have a TVR that had no speed signal from the pick-up on the rear axle for 2 summers (I used the satnav speedo) on an RV8, even when I decided to renew the pick-up unit it made no notable difference to the cars behavior, however you need to make sure the base idle bleed screw settings are correct or you may be plagued by stalling while you approach junctions etc
TVR Chimaera RV8 Mods & Megasquirt
Thanks for the reply. The vehicle is never likely to see a junction, only a Welsh logging track! The 6 pin connector was previously wired to an ignition 12volt but clearly this was not correct. The engine has never stalled but does have an unsettled high idle (revs will sit at 1500rpm but roughly every minute drop to 800rpm for a few seconds).
- richardpope50
- Gold Member
- Posts: 616
- Joined: Thu Jan 28, 2010 12:25 pm
- Location: Horsham, West Sussex
It is used for two purposes.
1.) To detect when vehicle is moving so that it can disconnect the idle speed control mode (when car moves).
2.) To drive the electronic speedometer.
All as per the LR manual I have.
1.) To detect when vehicle is moving so that it can disconnect the idle speed control mode (when car moves).
2.) To drive the electronic speedometer.
All as per the LR manual I have.
Richard.
Dax Rush 5.0l TVR V8, EFI with Megasquirt ECU and wasted spark, Racelogic Traction Control and Quaife LSD ....... Now nut and bolt restoring a TR6
Dax Rush 5.0l TVR V8, EFI with Megasquirt ECU and wasted spark, Racelogic Traction Control and Quaife LSD ....... Now nut and bolt restoring a TR6
- Ian Anderson
- Forum Contributor
- Posts: 2396
- Joined: Sun Nov 19, 2006 9:46 pm
- Location: Edinburgh
Is that the pin that needs a 490 hom resistor across it to fool the ECU into ignoring the expected tach signal?
Ian
Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.
- SimpleSimon
- Knows His Stuff
- Posts: 620
- Joined: Mon Apr 25, 2011 10:36 pm
- Location: East Sussex