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Author Topic: Alfa Romeo Giulietta - Supercharging pressure PIDs
Pajo
Member
Posts: 37
 Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

Hello everybody,
I’m here back with datas for Alfa Romeo Giulietta 2.0JTDm – Real supercharging pressure.

-> request = 22195A

Result from my diagnostic software was around 762 mbar.

I’m really confused how to do it to get correct values.

Thank you so much.

Capp777
Member
Posts: 2978
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

((A*256)+B)*(100/4369) ? for 1500 max.

Edited.

Pajo
Member
Posts: 37
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

I converted last “2F4” from hex to decimal number and the result is 756 which seems to be correct value.

But how to set right equation?

Pajo
Member
Posts: 37
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

Quote from Capp777 on December 15, 2019

((A*256)+B)*(1/44)

Thank you, I will give it a try.

enri_ge
Member
Posts: 6
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

the formula is (A * 256 + B) – 32768

Pajo
Member
Posts: 37
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

((A*256)+B)*(100/4369) ? for 1500 max.

This equation seems to be good but my Alfa Dynamic display shows 1.5bar on full power but the PID is not showing more than 790mbar (0.79bar).

I looked at responses and I’ve found 2195A83BA from diagnostic software which matches 954mbar. So the PID should show this value while driving, bud didn’t.

I’m confused.

Capp777
Member
Posts: 2978
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

Try enri’s equation.

I assumed absolute pressures but
maybe its gauge?

62195A 83 BA

83BA hex = 33722

33722 – 32768 = 954

62195A 82 F4

82F4 hex = 33524

33524 – 32768 = 756

Pajo
Member
Posts: 37
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

Yes,
enri’s equation is correct.

I edited the equation to match values on my Alfa Dynamic display:
(((A*256+B)-32768)*0.001)-0.8

PID is now showing same values in Bars.

enri_ge
Member
Posts: 6
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

on your car the same equation is valid for other PIDs reporting pressures measured in mBar:
221956 atmospheric pressure
221959 target overboost
2218E2 DPF differential pressure

Pajo
Member
Posts: 37
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

Thank you for sharing other PIDs

enri_ge
Member
Posts: 6
 Re: Alfa Romeo Giulietta - Supercharging pressure PIDson: December 15, 2019 (GMT)

you are welcome

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