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Author Topic: Alfa Romeo Giulietta - Supercharging pressure PIDs
Pajo
Member
Posts: 32
 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
-> reply = 62195A82F4
-> header = da10f1

Result from my diagnostic software was around 762 mbar.

Can you guys please help me with equation?
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)*(1/44) to match your data.

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

Edited.

Pajo
Member
Posts: 32
 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: 32
 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: 32
 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: 32
 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: 32
 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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