don17 Posted May 15, 2023 Report Share Posted May 15, 2023 I have a supra link in my supra, 2jzge non turbo converted to turbo. My speedo is out because I have bigger tyres on the rear, I have a mechanical driven speedo sensor on the gearbox 3 wire, factory wiring. How do I wire the speedo sensor on the gearbox through the ecu to correct the dash? Quote Link to comment Share on other sites More sharing options...
koracing Posted May 15, 2023 Report Share Posted May 15, 2023 The sensor on the trans is a hall effect sensor - so you would need to create a similar square wave output from the ecu - I'm not sure if any of the PWM outputs could do that natively or if you would need to add some other hardware. Without using the Link you can use something like the Dakota Digital SGI-100BT which has the ability to adjust an electronic speed signal. don17 1 Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 15, 2023 Report Share Posted May 15, 2023 I went through this on my MR2, wired the gearbox sensor directly to the ECU and then wired a spare Auxiliary output to the signal wire that used to go to the gearbox speed sensor. From memory I did need to change the power to the gearbox speed sensor from 12V to 5V for it to work with the Link. don17 1 Quote Link to comment Share on other sites More sharing options...
don17 Posted May 15, 2023 Author Report Share Posted May 15, 2023 1 hour ago, Vaughan said: I went through this on my MR2, wired the gearbox sensor directly to the ECU and then wired a spare Auxiliary output to the signal wire that used to go to the gearbox speed sensor. From memory I did need to change the power to the gearbox speed sensor from 12V to 5V for it to work with the Link. When you wired directly to the ecu is that to a DI ? Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 15, 2023 Report Share Posted May 15, 2023 14 minutes ago, don17 said: When you wired directly to the ecu is that to a DI ? Yes don17 1 Quote Link to comment Share on other sites More sharing options...
don17 Posted May 16, 2023 Author Report Share Posted May 16, 2023 3 hours ago, Vaughan said: I went through this on my MR2, wired the gearbox sensor directly to the ECU and then wired a spare Auxiliary output to the signal wire that used to go to the gearbox speed sensor. From memory I did need to change the power to the gearbox speed sensor from 12V to 5V for it to work with the Link. Sorry I'm still abit confused, so you taken the signal wire going for the gearbox, wired that into a digital input. And then have a aux output going to the dash speedo? And the 12v supply to the gearbox was cut and used a 5v supply instead? Quote Link to comment Share on other sites More sharing options...
koracing Posted May 16, 2023 Report Share Posted May 16, 2023 @Vaughan Why would a hall effect sensor need to be 5v instead of 12v for the link to recognize it? It's looking for falling or rising edges I thought. Regarding MR2s (for posterity) only 1993 and later models used an electronic signal to the dash to drive the OEM speedometer, so 1992 and earlier models won't work this way as the speedometer is driven by a mechanical cable. Quote Link to comment Share on other sites More sharing options...
Vaughan Posted May 16, 2023 Report Share Posted May 16, 2023 7 hours ago, koracing said: @Vaughan Why would a hall effect sensor need to be 5v instead of 12v for the link to recognize it? It's looking for falling or rising edges I thought I believe the issue with the 12V is that it doesn't pull low enough to go under the ground threshold, or at least that was my experience on my car. 7 hours ago, koracing said: Regarding MR2s (for posterity) only 1993 and later models used an electronic signal to the dash to drive the OEM speedometer, so 1992 and earlier models won't work this way as the speedometer is driven by a mechanical cable. I have an e153 lsd from a 1992 in my car (equivalent to a 1993 in the US) but you can also use mechanical to electrical adapters from st18x Celicas if you are converting to an electronic cluster with an earlier gearbox. 20 hours ago, don17 said: Sorry I'm still abit confused, so you taken the signal wire going for the gearbox, wired that into a digital input. And then have a aux output going to the dash speedo? And the 12v supply to the gearbox was cut and used a 5v supply instead? I have attached a picture of the pinout for the standard Toyota 3 pin speedo plug. Run all three wires from this to the ECU and then run a spare auxiliary output to the wire that use to go into the signal pin. For the ground you may not need to run that to the ECU specifically due to everything sharing the chassis ground, might be worth just mocking everything and testing before finalising it. Quote Link to comment Share on other sites More sharing options...
koracing Posted May 17, 2023 Report Share Posted May 17, 2023 16 hours ago, Vaughan said: I believe the issue with the 12V is that it doesn't pull low enough to go under the ground threshold, or at least that was my experience on my car. This is what I was wondering. I've got a 91 car here I'm adding the Toyota cruise control speed sensor that piggybacks inline with the speedometer cable on top of the trans (item F in the pic below) to as a possible input for the speed signal as typically the dash speed signals are super noisy in the Link software (but works on other ecus ok). If there's a problem with the 12V input to that sensor, I will look at possibly pulling the signal down somehow, or opening the harness and going with 5v instead. Quote Link to comment Share on other sites More sharing options...
koracing Posted May 17, 2023 Report Share Posted May 17, 2023 How low does the hall signal need to fall to be recognized by the Link? I'm bench testing some options with a scope and multi-meter. On the bench adding a 1k pullup between signal and power supply (12.2v) makes the hall signal go between 1.4v and 12.2v. 14v input it goes from 1.6v and 14.0v. A 10k pullup makes the voltage go between 0.17v and 12.1v with 12.2v input, or .19v and 13.8v at 14v input. Given that: adding a 10k pullup seems like the way to go to ensure a proper low for the Link? Quote Link to comment Share on other sites More sharing options...
Adamw Posted May 17, 2023 Report Share Posted May 17, 2023 The high threshold is about 1.6V, low threshold is about 1.0V. The DI pull-up if enabled is 4K7 to regulated 12V, there is a low drop schottky in series with the pull-up so consider it more like 11.7V pull-up. I would expect it should work fine with almost any automotive hall sensor out there provided the sensor and ECU ground are at similar potential. koracing 1 Quote Link to comment Share on other sites More sharing options...
don17 Posted October 30, 2023 Author Report Share Posted October 30, 2023 Still haven't figured this out just yet, Quote Link to comment Share on other sites More sharing options...
koracing Posted October 30, 2023 Report Share Posted October 30, 2023 Are you still needing help? I would try Aux1-8 outputs to drive the speedometer as they should float high (~12v) when the output is inactive so pulse between 12v and ground. Quote Link to comment Share on other sites More sharing options...
don17 Posted October 31, 2023 Author Report Share Posted October 31, 2023 10 hours ago, koracing said: Are you still needing help? I would try Aux1-8 outputs to drive the speedometer as they should float high (~12v) when the output is inactive so pulse between 12v and ground. Okay I'll try this thanks, Quote Link to comment Share on other sites More sharing options...
don17 Posted March 25 Author Report Share Posted March 25 On 10/31/2023 at 2:34 AM, koracing said: Are you still needing help? I would try Aux1-8 outputs to drive the speedometer as they should float high (~12v) when the output is inactive so pulse between 12v and ground. yes, still after some help. So ive tired wirng up the speedo as per this post linked, using a aux input and digital but dosen't seem to work, when i start moving the speedo will move up to about 10km/hr and stay there until coming to a stop? on the G4 software AUX for speedo becomes green when moving, then turns of when stopped. anymore help would be great this is my log file https://www.dropbox.com/scl/fi/z9axyr7mvv1ey4b3jz2z3/newspeedo.pclr?rlkey=y5y9f5kbiwiga20bo2odyj49n&dl=0 https://www.dropbox.com/scl/fi/dbzodpsn52jugjf2hwarf/screenshot.png?rlkey=rua4tw8akvwqdy1uokkbq99s1&dl=0 Quote Link to comment Share on other sites More sharing options...
Vaughan Posted March 25 Report Share Posted March 25 Shouldn't multi be set to 0.8333, offset to 0Hz and max freq to 4000Hz for now until you know how far it should actually move? Quote Link to comment Share on other sites More sharing options...
don17 Posted March 25 Author Report Share Posted March 25 3 hours ago, Vaughan said: Shouldn't multi be set to 0.8333, offset to 0Hz and max freq to 4000Hz for now until you know how far it should actually move? I really don't know what these values should be I'll try that today tho and get back to you Quote Link to comment Share on other sites More sharing options...
Vaughan Posted March 26 Report Share Posted March 26 1 hour ago, don17 said: I really don't know what these values should be I'll try that today tho and get back to you Help manual explains what each of them do, just single click on one of them and press F1 Quote Link to comment Share on other sites More sharing options...
don17 Posted March 26 Author Report Share Posted March 26 54 minutes ago, Vaughan said: Help manual explains what each of them do, just single click on one of them and press F1 no worries, I do have a bit of a look but sometimes unsure where to start. I changed some settings offset to 0 multi to 0.98 max frequency to 400hz the speedo moves now and speed is pretty acurate but the need response seems abit slow? also, when i take off the needle jumps to about 20km/hr almost straight away then will start to move accurately as speed is increased, any idea what to check? https://www.dropbox.com/scl/fi/99zr9qtqpodz6r46ezmz9/newspeedo1.pclr?rlkey=u1h8pssq16fhe5567y4xitzhe&dl=0 new log file Quote Link to comment Share on other sites More sharing options...
Vaughan Posted March 26 Report Share Posted March 26 45 minutes ago, don17 said: https://www.dropbox.com/scl/fi/99zr9qtqpodz6r46ezmz9/newspeedo1.pclr?rlkey=u1h8pssq16fhe5567y4xitzhe&dl=0 new log file That is a basemap(.pclr) file not a log (.llg) file, you made the same comment earlier. The Multi of 0.83 I provided earlier was based on your other thread where you said you were doing 120 when it said 100. DI 1 has a calibration value of 200 so 10Hz input is about 18kph and from memory G4+ PWM outputs have a minimum frequency of 10Hz so that would explain why it is jumping to ~20kph immediately. Quote Link to comment Share on other sites More sharing options...
don17 Posted March 26 Author Report Share Posted March 26 21 minutes ago, Vaughan said: That is a basemap(.pclr) file not a log (.llg) file, you made the same comment earlier. The Multi of 0.83 I provided earlier was based on your other thread where you said you were doing 120 when it said 100. DI 1 has a calibration value of 200 so 10Hz input is about 18kph and from memory G4+ PWM outputs have a minimum frequency of 10Hz so that would explain why it is jumping to ~20kph immediately. no worries, i appricate the help. https://www.dropbox.com/scl/fi/hbwp6zkaxa14u4m19abhi/start-up.llg?rlkey=ulbqou1w22x4so1ds4t7nh2e6&dl=0 sorry this is my log, is there anything i can do with the minimum frequency to stop it jumping up so fast? its not a big deal tho Quote Link to comment Share on other sites More sharing options...
Vaughan Posted March 26 Report Share Posted March 26 28 minutes ago, don17 said: is there anything i can do with the minimum frequency to stop it jumping up so fast? its not a big deal tho As far as I'm aware it is a hardware limitation on the G4+ ECUs Quote Link to comment Share on other sites More sharing options...
don17 Posted March 26 Author Report Share Posted March 26 1 minute ago, Vaughan said: As far as I'm aware it is a hardware limitation on the G4+ ECUs Now worries I appricate all the help thanks, Quote Link to comment Share on other sites More sharing options...
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