Elite to FD transmission speed sensor
 

Anyone actually running Haltech Elite (or even PS?) wired directly to FD3S vehicle speed sensor in transmission ?

Whats your settings?

thanks

(not interested in setups with stock gauge clusters and using for haltech already conditioned signal from stock speedo (3E)


https://cimg1.ibsrv.net/gimg/www.rx7...b7cdfd08d6.png

Nevermind.

i just realized you are using it without the stock cluster. from what i understand the signal type gets changed there before it goes to the ECU.

anyone at all? i too have to get my fd vss in my tranny working ive used a spi wire and a signal ground, but have still to get it to work! let me know!

I'm not sure this is what you need but my Vehicle Speed Sensor Wiring page shows hooked up via SPI3, Edge - Falling, Sensor - Hall Effect, Pull up - Enable, Main Source drop down is Drive Train, Drive Train Sensor Checkbox - checked and drop down for that is Digital Frequency. The Calibration Page has Calibration Speed as mph and Drive Train Sensor as 3800 Pulses/mile.

I used your settings and the sensor is registering when I drive around, but the calibration is off. What value did you use for the calibration speed? The default is 37.3 mph, which doesn't appear to be correct.

My calibration page is set as calibration speed 40 mph, drive shaft sensor with 50 teeth. My rear tires are 315/35-17 and by Tire Rack these are 809 revolutions per mile.

Hmmm.. well, I set my calibration speed to 40 mph, drove to roughly 40mph (3000 rpm in 3rd gear) and hit the calibrate button. I did this several times and the setting came up between 7800 to 8400 pulses/mile. So I have left the setting at 40mph and 8400 pulses per mile. At least my speedometer reading is now in the ballpark.

Also, the speedometer gauge is blinking red whenever a readout registers. I tried changing the gear teeth from 50 to 23. This didn't do anything.

I thought this thread may be easier to find in the future for others so I'm asking a new variation of the bigger picture question.

I have changed transmissions and it has a Hall Effect speed sensor outputting 0-14V signal from sensing a 12 tooth ring on the output shaft. I see the signal wire vary voltage when I test with key on and turning the rear wheel slowly. All the things I've tried have NOT resulting in the Haltech Elite 2500 or speedo in seeing a usable speed signal. Previous wiring was Haltech recommended setup using SPI3 for stock FD trans and the ECU and Speedo displayed a speed reading.

From what I have read it appears that Mazda intended the speed signal to be sent from the transmission to the wiring for the speedo and then out to pin 1M on the stock ECU wiring connector, thus the current connection from 1M to B10/SPI3 for the Haltech. I tried hooking the new signal wire output to the stock transmission speedo connector and tried both wires and neither case resulted in a speed reading or any indication of signal by the Haltech.

Today I disconnected the stock transmission wiring, i.e. no input. With pull-up enabled it stays at 5 volts but with pull-up disabled for some reason the Haltech is showing a changing voltage SPI3 signal as the car moves, approx 1.8 to 3.4 volts. I'm confused as to what would cause that.

So now another aspect of my ignorance, The speed sensor calibration doesn't convert this voltage into a speedo reading, It seems that if it is seeing some varying voltage it would think it had a speed signal. I have upgrade to the NSP software and the Frequency Time Constant is set to 1 and it may need to be much higher.

So two quesions: If I disconnect the 1M to B10/SPI3 for the Haltech and connect the new Hall Effect sensor's signal output to SPI3 should I get a signal that the calibration can be setup for so the NSP software would have a Vehicle Speed reading? This much of the problem being solved would appear to support what would be needed for an IC-7 to have a speedo. Second question: Does anyone have an idea on how to get both the stock speedo to read and the Haltech Vehicle Speed reading also?

Progress; I have a Vehicle Speed reading at the ECU. I changed the Frequency Time Constant value from 1 to 100 and connected the Hall Effect sensor signal wire to SPI3. In the garage I could see the SPI Freq value change between 0 and about 25 has I rotated the wheel, thus trans output shaft. So I went for a drive, hit the calibrate button, and the Vehicle Speed value appeared. The stock speedo doesn't work with this setup so I need to go back and try getting the signal up through the transmission speedo wiring. Maybe the Frequency Time Constant being 1 was a big part of the original problem but if the signal goes to the stock speedo first I don't understand how a setting on the ECU would allow it to understand the signal it is getting from the sensor. If I don't have any success that way I guess I be ordering a IC-7 dash.

The OE configuration uses a VR sensor fed directly to the cluster. That signal drives the speedo. The cluster then conditions the signal to square wave and that is fed from the cluster to the ECU. You won’t be able to drive the speedo in the dash with your Hall sensor.

Thanks for the confirmation Chris.

For any of you EE types, do any inexpensive gadgets exists that convert a digital signal to a VR signal? I primarily asks out of curiosity but if such a gadget existed it may be worth experimenting with.

Try this it maybe help or not!!!!

https://sirhclabs.com/product/vr-to-...sor-converter/

Thanks, but it needs to be the other way around I believe.

Doing some searches for a Hall To VR Sensor convertor lead me to realizing that an ABS sensor may be able to be used as a VR speed signal My ABS is disconnected but I still have two of the sensors in place so maybe I can try wiring that up. It seems a long shot that an ABS sine wave will be produce a proper speed signal but I'll look at the wiring this weekend.