Nick Moleta Posted October 10, 2010 Report Share Posted October 10, 2010 Trying to get the speedo out function to work on my pulsar. I have wired the positive side from the VSS to a digital input (DI5 which is standard for my plugin) and that all works fine. When I spin the VSS by hand there is a good response on the PCLink screen. The problem is that I have configured a spare auxiliary output (Inj 8) as a speedo out but not getting any response from this. I believe as the standard vss is 2-wire it is a reluctor type so shouldn't require the pull-up resistor. I have also tried setting it as both a speed input and a frequency input as recommended in the pclink help. Also no matter what settings I put in for the key on sweep there is no response on the speedo. The speedo still works fine as if I put the vss output back to the speedo it still functions normally. Quote Link to comment Share on other sites More sharing options...
Nick Moleta Posted October 10, 2010 Author Report Share Posted October 10, 2010 Attached wiring diagram. Also in the first post it is the DI that I tried configuring as both a speed input and a frequncy input not the aux output (obviously). Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted October 13, 2010 Report Share Posted October 13, 2010 Hi Nick. Have you tried leaving the speedo as it is because it works, and then just tee in to the VSS to take that to the ECU for speed in DI. It sounds like you have a speedo geared to respond to a reluctor signal, which the Link can't output. If the speedo was PWM, then no problem. This is also the reason you can't do sweep on speedo, as it won't respond to the PWM output from INJ8 like the Tacho does (as that is PWM). I pretty much have the same set up as you, and this is what works for me. It just sux that PWM speedos came out a bit more commonly in the later years of cars... Mines a 4x4 '92 Primera. I want key sweep on both too If by some amazing chance it is PWM, the possibility exists that you have not set a multiplier on the speedo out, as PWM sig x zero = zero. Pop a 1 in there if this is the case, but I doubt it. Jurgen Quote Link to comment Share on other sites More sharing options...
Nick Moleta Posted October 14, 2010 Author Report Share Posted October 14, 2010 Thanks for the reply Jurgen. Unfortunately it sounds like you're right. The gauges are integrated with the control module for which I have no circuit diagram (its made of a flexible printed circuit). I might try and open it up tonight to see what goes on and try and borrow a scope form work to see what the actual output to the speedo is. If the control module converts it to a signal the link can deal with it might be possible to splice it in there otherwise short of an aftermarket speed sensor and probably speedo its going to be impossible. Wish me luck. Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted October 14, 2010 Report Share Posted October 14, 2010 Hi Nick. Don't be going tearing in to your dash so quickly Mine already had a wire to the ECU for speed function. Mine sat on pin 32 (DI5) as yours does, so just make sure you have some form of calibratoin there. Picking it is the same as mine... So I have attached a shot of my speed set up. See how that goes, because you should not need to modify anything really. Unless you mean your going to try and modify it for the key sweep thing Jurgen Quote Link to comment Share on other sites More sharing options...
Nick Moleta Posted October 14, 2010 Author Report Share Posted October 14, 2010 Yeah that's right. The stock setup has the speedwire going to the correct pin on the stock and plug-in ecu which I can easily rectify. Just not going to give up on the gauge sweep before I try one more time! If the speed wire to the ECU is the same as the input to the tach and there is somewhere to break the signal I should be all good to go. I think the last part is going to be the tricky one. Will let you know what I find. Quote Link to comment Share on other sites More sharing options...
Jurgen Biggelaar Posted October 14, 2010 Report Share Posted October 14, 2010 Cool, please do Nick. *sniggers away with selfish reasoning* Jurgen Quote Link to comment Share on other sites More sharing options...
Nick Moleta Posted October 14, 2010 Author Report Share Posted October 14, 2010 Into the too hard basket I'm afraid. The speedo is soldered directly into a pcb that incorporates the odometer etc so no straight forward way to break in there. Nevermind. Quote Link to comment Share on other sites More sharing options...
martin battye Posted October 16, 2010 Report Share Posted October 16, 2010 Nick.., the OEM Nissan speedometer reads the gearbox output signal,, this is an AC waveform.. the speedo unit in the clock converts this to a PWM output for the ECU to read speed. the Link ECU cannot replicate the AC waveform. so cannot directly drive a Nissan speedometer.. Although.., as we have done recently on Nissan S13 with RB swop. (problem here is the gearbox transducer is the correct type yet outputs half the amount of pulses as the CA18DET gearbox, so speed reads half) we have used a second RPM meter in the place of original speedo.. this is now driven via a PWM output from the Link ECU as speedo. with this you will lose your Odometer. Quote Link to comment Share on other sites More sharing options...
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