Installing the FAST EZ-EFI 2.0 Multi-Port Retro Kit in a 1987 Pontiac Fiero V6 (Page 7/8)
zkhennings MAR 03, 10:52 AM
Pin A on the C203 is the shift light, that pin needs to be grounded. If your ECU shift light output grounds when on, then you can just pin it into that pin A spot. It is pin part number: 12034046, I got some from Mouser. This is the pin that fits in the C203 housing. You may be able to adjust the shift light point from the controller screen thingy.

[This message has been edited by zkhennings (edited 03-03-2023).]

sleek fiero MAR 03, 11:08 AM
I do believe the tach signal comes from the white wire that also goes to the tach filter. the ecu gets it's tach signal from the est white wire.

[This message has been edited by sleek fiero (edited 03-03-2023).]

82-T/A [At Work] MAR 03, 11:16 AM

quote
Originally posted by zkhennings:

Pin A on the C203 is the shift light, that pin needs to be grounded. If your ECU shift light output grounds when on, then you can just pin it into that pin A spot. It is pin part number: 12034046, I got some from Mouser. This is the pin that fits in the C203 housing. You may be able to adjust the shift light point from the controller screen thingy.





quote
Originally posted by sleek fiero:

I do believe the tach signal comes from the white wire that also goes to the tach filter. the ecu gets it's tach signal from the est white wire.





Thanks guys, yeah... that wire will get used by the new ECM, but I can't remember if the EZ-EFI has a shift-light control. I'll have to check the manual.
PhatMax MAR 03, 02:50 PM
It would be sweet if the shift light could be configured to be set 2-300 below redline.. otherwise it seemed useless to me.
82-T/A [At Work] MAR 03, 03:46 PM

quote
Originally posted by PhatMax:

It would be sweet if the shift light could be configured to be set 2-300 below redline.. otherwise it seemed useless to me.




Yeah, the factory one was more of an economy thing... it used the MAP sensor as one of it's feeds.
Cliff Pennock MAR 03, 04:53 PM

quote
Originally posted by Trinten:

If helpful, I know the Speedometer runs at 4000 PPM.



I'm pretty sure it's 2000p/m. That's what I programmed my digital dash with... Then again, I haven't read the entire thread so I'm not sure we are talking about the stock V6?
sanderson231 MAR 04, 11:18 AM

quote
Originally posted by Cliff Pennock:


I'm pretty sure it's 2000p/m. That's what I programmed my digital dash with... Then again, I haven't read the entire thread so I'm not sure we are talking about the stock V6?



I know that when the Fiero VSS is connected to a 4.9L Caddy PCM that the pulse per mile need to get set to 4000 in the PCM. Maybe the discrepancy is in the definition of a pulse. As I understand it the Fiero VSS produces a sine wave. There are twice as many peaks and valleys as there are peaks.

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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged

fieroguru MAR 04, 03:27 PM
It is 4000 PPM from the fiero VSS to the speedo. 2000 PPM from the speedo to the stock Fiero ECM.

[This message has been edited by fieroguru (edited 03-04-2023).]

Cliff Pennock MAR 05, 05:57 AM
Yeah I remember now what my problem was when I made the digital dashboard. The signal coming from the VSS is indeed 4000ppm even though the Service Manual (erroneously) says on one page it's 2000ppm:



The 4000ppm sine wave is then converted to a 2000ppm block wave by the instrument cluster and sent to the ECM. That is the signal I used for my digital dash.
sleek fiero MAR 14, 04:19 PM
82 T/A so I was wondering if you have dragged your car out yet or are you still playing with your daughters tractor engine? I will be following your progress with your new ecu. sleek