OBD-II PIDs for Audi B8 / B8.5 S4 / S5 3.0T

[-leman-]

Picked up an el-cheapo OBD-II WiFi dongle and loaded EngineLink app from AppStore this weekend to have a chance to monitor some basic ECU parameters on the go (I also have VCDS and realise that OBD-II based universal tools will never compete in accuracy and scope of diagnostic info provided). Wanted to be always able to check the simple things like boost / IAT etc. on my iPhone without the need to go get a notebook from home etc. I quickly realised that even the best examples of mobile dignostic apps (like Torque Pro, which is not available for iPhone btw) seriously lack in engine parameters display department with such simple things like e.g. IATs being not available on my B8 S5 3.0T.

I spent some time to pick up the most notoriously lacking info and wanted to share (in a secret hope someone would share back more info )

These may be added as custom gauges in any OBD-II app that supports adding custom PIDs (note you may also change the formulas as you wish e.g. to get it in F and psi instead of my units or calculate boost rather than absolute pressure):
Charge air cooler temperature (IAT post-charger, post-cooler, in C) PID 77, formula: B-40
Intake manifold pressure (actual, absolute, in kpa) PID 70, formula (D*256+E)/32

These worked out of the box and I think are availble as such on most apps but I thought I still list them as confirmed to be working:
Ignition timing advance (in deg) PID 0E, formula A/2-64
Engine coolant temp (in C) PID 05, formula A-40

Would be happy if anyone shares more or confirms my findings above as working on his car as well. If any more custom PIDs info would follow up I'll update the lists.

[xpoweruk]

Just for reference,IAT's are available in Torque pro on Android.
They are under the heading CACT (Charge Air Cooler Temperature iirc)

[umairg35]

There are a lot options in DashCMD... have not played around too much with it.


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[awwturbo]

I use DashCommand and it doesn't support IAT or Boost PIDs. I don't think I can add custom PIDs to it which stinks.

[derek.kritz]

I just downloaded the Torque app. Seems to have a little more options on logging perimeters than dash command. Is there a way to log boost bypass?


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[-leman-]

Just for reference,IAT's are available in Torque pro on Android.
They are under the heading CACT (Charge Air Cooler Temperature iirc)

Yes, this is exactly what made me dig into it. I think they pull the data exactly from the PID I mentioned above.

There are a lot options in DashCMD... have not played around too much with it.

I use DashCommand and it doesn't support IAT or Boost PIDs. I don't think I can add custom PIDs to it which stinks.

Yes, looks like DashCommand for iOS does not allow custom PIDs unfortunately. They say due to Apple limitations on app developers: http://www.palmerperformance.com/for...p?topic=1926.0

I used EngineLink, not as nice looking but does the job and has custom PIDs functionality.

I just downloaded the Torque app. Seems to have a little more options on logging perimeters than dash command. Is there a way to log boost bypass?

PID 72 would be my guess, but no idea if the data is there and how to interpret.

Wikipedia has a nice page on OBD-II PIDs but not all ifo is universal across the different vehicles and formulas are often missing https://en.wikipedia.org/wiki/OBD-II_PIDs

[omegis83]

OBD Fusion for iOS allows custom PIDs, has Apple Watch support, and supports the Carista adapter. I'm going to test the IAT PID later today.

OBD Fusion - OBD2 vehicle scan tool and diagnostics by OCTech, LLC
https://appsto.re/us/eOkYM.i

[Hofahome]

OBD Fusion for iOS allows custom PIDs, has Apple Watch support, and supports the Carista adapter. I'm going to test the IAT PID later today.

OBD Fusion - OBD2 vehicle scan tool and diagnostics by OCTech, LLC
https://appsto.re/us/eOkYM.i

Ya I've been pretty impressed with OBD fusion for simple logs. Seems to work well for IATs.

[omegis83]

Ya I've been pretty impressed with OBD fusion for simple logs. Seems to work well for IATs.

What PID are you using to track IATs? I've tried Charge Air Cooler Temperature Bank 1, Sensor 1 with OBD Fusion but it seems slow to update.

[-leman-]

I don't have OBD Fusion but from the name of it I guess you use one of the parameters available by default. Did you try to add the one in the first message? Does it work?

[omegis83]

I don't have OBD Fusion but from the name of it I guess you use one of the parameters available by default. Did you try to add the one in the first message? Does it work?

Nope because it needed OBD mode number

[Loe]

gr8 info on the Torque App pro and IAT, would definitely come in handy vs. dragging a laptop with me for each track day when I just want to run for fun, but monitor starting IAT's at the same time.

[-leman-]

Nope because it needed OBD mode number

Try mode 01
I understood it's always 01 for real-time PIDs
Also header should be "auto" or equivalent, if such option is available in OBD Fusion. If not, I guess ECM could work...

[omegis83]

Try mode 01
I understood it's always 01 for real-time PIDs
Also header should be "auto" or equivalent, if such option is available in OBD Fusion. If not, I guess ECM could work...

Kind of on the high side for being 75F outside

[-leman-]

Yeah)))

What formula you use?

If you just use "B-40" you should get the value in C (not in F), did you use an extra formula to convert C -> F? If yes, could this formula be off?

[Hofahome]

What PID are you using to track IATs? I've tried Charge Air Cooler Temperature Bank 1, Sensor 1 with OBD Fusion but it seems slow to update.

Ya that's the one I use but it can be slow to update for me as well. It's good for ballparking IAT deltas and that is about it.


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[doug97gxe]

Kind of on the high side for being 75F outside

is this boost on an iPhone? i couldn't get this sh!t working for the life of me

[omegis83]

is this boost on an iPhone? i couldn't get this sh!t working for the life of me

Yes

Boost pressure sensor A

[pcardenas]

Any one has more info for Torque o for Iphone apps??

[-leman-]

What exactly parameters do you need?

I may actually post all parameters (PIDs / formulas) EngineLink has available. A lot (but not all) work for my B8 S5. Except for the ones above (first post) I did not check if the data is plausible, however.

[doug97gxe]

Yes

Boost pressure sensor A

Custom PID? And if so can u share ur screens ?


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[omegis83]

Custom PID? And if so can u share ur screens ?


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Not a custom PID, even though I'm planning to test the one -leman- provided in the first post. Boost is under SAE PIDs on OBD Fusion.

Also, here's what I've got for IAT but it seems to round to the nearest whole number and I need to figure how to convert to F. I'll try the factor and offset formula. Since the app evaluates in metric, their formula is (metric value * factor) + offset, so I'm thinking factor of 1.8 and offset of 32.

What exactly parameters do you need?

I may actually post all parameters (PIDs / formulas) EngineLink has available. A lot (but not all) work for my B8 S5. Except for the ones above (first post) I did not check if the data is plausible, however.

This would be a great idea!

Update: Formula seemed to work for IAT in Fahrenheit.




Boost formula is off. It was reading 30+ PSI at idle.

And here's what I've got for Boost (user defined):


And here's a list of relevant PIDs:
http://imgur.com/a/1GLje

[-leman-]

Update: Formula seemed to work for IAT but Boost formula is off. It was reading 30+ PSI at idle. Seems the built in SAE PID for boost is more accurate (see pic) but is off by a few PSI.

My formula for boost is in kpa, and absolute pressure. So 30+ kpa absolute is roughly -0,7 bar or -10 psi boost (that's a rough calculation, I used 14,5 psi as ambient pressure). Seems not far off if it's your value at idle.

And here's a list of relevant PIDs:
http://imgur.com/a/1GLje

The link doesn't work for me...

[omegis83]

My formula for boost is in kpa, and absolute pressure. So 30+ kpa absolute is roughly -0,7 bar or -10 psi boost. Seems not far off if it's your value at idle.



The link doesn't work for me...

I was trying to prevent eating up more screen real estate with my pictures but here you go:

[-leman-]

Looks like OBD Fusion has a lot available by default.

Here's what I have in EngineLink (I copied this from CSV file, but the format is hopefully clear - fist 4 digits in each row is mode (01) and PID (04, 05, etc) - I took the US units formulas):

ModePID,Description,Min,Max,Units,Formula,Header
0104,Calculated engine load value,0,100,%,A*100/255,0
0105,Engine coolant temperature,-40,419,ЎF,(A-40)*9/5 + 32,0
0106,Short term fuel % trim Bk 1,-100,99.22,%,(A-128) * 100/128,0
0107,Long term fuel % trim Bk 1,-100,99.22,%,(A-128) * 100/128,0
0108,Short term fuel % trim Bk 2,-100,99.22,%,(A-128) * 100/128,0
0109,Long term fuel % trim Bk 2,-100,99.22,%,(A-128) * 100/128,0
010A,Fuel pressure,0,111,psi,A*3*0.145,0
010B,Intake manifold abs pressure,0,37,psi,A*0.145,0
010C,Engine RPM,0,16383.75,rpm,((A*256)+B)/4,0
010D,Vehicle speed,0,158,mph,A*0.6215,0
010E,Timing advance,-64,63.5,Ў,A/2 - 64,0
010F,Intake air temperature,-40,419,ЎF,(A-40)*9/5 + 32,0
0110,MAF air flow rate,0,655.35,g/s,((A*256)+B) / 100,0
0111,Throttle position,0,100,%,A*100/255,0
0114,Bk 1 Sensor 1 O2 Voltage,0,1.275,V,A/200,0
0115,Bk 1 Sensor 2 O2 Voltage,0,1.275,V,A/200,0
0116,Bk 1 Sensor 3 O2 Voltage,0,1.275,V,A/200,0
0117,Bk 1 Sensor 4 O2 Voltage,0,1.275,V,A/200,0
0118,Bk 2 Sensor 1 O2 Voltage,0,1.275,V,A/200,0
0119,Bk 2 Sensor 2 O2 Voltage,0,1.275,V,A/200,0
011A,Bk 2 Sensor 3 O2 Voltage,0,1.275,V,A/200,0
011B,Bk 2 Sensor 4 O2 Voltage,0,1.275,V,A/200,0
011F,Run time since engine start,0,65535,s,(A*256)+B,0
0121,Distance traveled with MIL on,0,40721,mile,((A*256)+B)*0.62137,0
0122,Fuel Pressure (relative to vacuum),0,750,psi,(((A*256)+B) * 0.079)*0.145,0
0123,Fuel Pressure (direct inject),0,95025.75,psi,(((A*256)+B) * 10)*0.145,0
0124,O2S1_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
0125,O2S2_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
0126,O2S3_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
0127,O2S4_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
0128,O2S5_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
0129,O2S6_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
012A,O2S7_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
012B,O2S8_WR_lambda(Voltage),0,2,NA,((A*256)+B)*2/65535,0
012C,Commanded EGR,0,100,%,A*100/255,0
012D,EGR Error,-100,99.22,%,(A-128) * 100/128,0
012E,Commanded evaporative purge,0,100,%,A*100/255,0
012F,Fuel Level Input,0,100,%,A*100/255,0
0130,# of warm-ups since codes cleared,0,255,N/A,A,0
0131,Distance since codes cleared,0,40721,mile,((A*256)+B)*0.62137,0
0133,Barometric pressure,0,37,psi,A*0.145,0
0134,O2S1_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
0135,O2S2_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
0136,O2S3_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
0137,O2S4_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
0138,O2S5_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
0139,O2S6_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
013A,O2S7_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
013B,O2S8_WR_lambda(Current),0,2,NA,((A*256)+B)/32768,0
013C,Catalyst Temp Bk 1 Sensor 1,-40,6513.5,C,((A*256)+B)/10 - 40,0
013D,Catalyst Temp Bk 2 Sensor 1,-40,6513.5,C,((A*256)+B)/10 - 40,0
013E,Catalyst Temp Bk 1 Sensor 2,-40,6513.5,C,((A*256)+B)/10 - 40,0
013F,Catalyst Temp Bk 2 Sensor 2,-40,6513.5,C,((A*256)+B)/10 - 40,0
0142,Control module voltage,0,65.535,V,((A*256)+B)/1000,0
0143,Absolute load value,0,25700,%,((A*256)+B)*100/255,0
0144,Command equivalence ratio,0,2,N/A,((A*256)+B)/32768,0
0145,Relative throttle position,0,100,%,A*100/255,0
0146,Ambient air temperature,-40,419,ЎF,(A-40)*9/5 + 32,0
0147,Absolute throttle position B,0,100,%,A*100/255,0
0148,Absolute throttle position C,0,100,%,A*100/255,0
0149,Accelerator pedal position D,0,100,%,A*100/255,0
014A,Accelerator pedal position E,0,100,%,A*100/255,0
014B,Accelerator pedal position F,0,100,%,A*100/255,0
014C,Commanded throttle actuator,0,100,%,A*100/255,0
014D,Time run with MIL on,0,65535,min,(A*256)+B,0
014E,Time since trouble codes cleared,0,65535,min,(A*256)+B,0
0150,Max value for air flow rate,0,2550,g/s,A*10,0
0152,Ethanol fuel %,0,100,%,A*100/255,0
0153,Abs Evap system Vapor Pressure,0,47.5,psi,(((A*256)+B)/200)*0.145,0
0154,Evap system vapor pressure,-32767,32768,Pa,((A*256)+B)-32768,0
0155,Short term secondary O2 trim bk 1,-100,99.22,%,(A-128)*100/128,0
0155,Short term secondary O2 trim bk 3,-100,99.22,%,(B-128)*100/128,0
0156,Long term secondary O2 trim bk 1,-100,99.22,%,(A-128)*100/128,0
0156,Long term secondary O2 trim bk 3,-100,99.22,%,(B-128)*100/128,0
0157,Short term secondary O2 trim bk 2,-100,99.22,%,(A-128)*100/128,0
0157,Short term secondary O2 trim bk 4,-100,99.22,%,(B-128)*100/128,0
0158,Long term secondary O2 trim bk 2,-100,99.22,%,(A-128)*100/128,0
0158,Long term secondary O2 trim bk 4,-100,99.22,%,(B-128)*100/128,0
0159,Fuel rail pressure (absolute),0,95025.75,psi,((A*256)+B) * 10*0.145,0
015A,Relative accelerator pedal position,0,100,%,A*100/255,0
015B,Hybrid battery pack remaining life,0,100,%,A*100/255,0
015C,Engine oil temperature,-40,419,ЎF,(A - 40)*9/5 + 32,0
015D,Fuel injection timing,-210.00,301.992,Ў,(((A*256)+B)-26880)/128,0
015E,Engine fuel rate,0,848.7,Gal/h,((A*256)+B)*0.05*0.264172,0
0161,Driver's demand engine torque,-125,125,%,A-125,0
0162,Actual engine torque,-125,125,%,A-125,0
0163,Engine reference torque,0,48338,lb-ft,(A*256+B)*0.7376,0
0178,EGT11 support,0,1,bit,{A:0},0
0178,EGT12 support,0,1,bit,{A:1},0
0178,EGT13 support,0,1,bit,{A:2},0
0178,EGT14 support,0,1,bit,{A:3},0
0178,EGT11 Temp,-40,6513,F,((B*256+C)/10-40)*9/5 + 32,0
0178,EGT12 Temp,-40,6513,F,((D*256+E)/10-40)*9/5 + 32,0
0178,EGT13 Temp,-40,6513,F,((F*256+G)/10-40)*9/5 + 32,0
0178,EGT14 Temp,-40,6513,F,((H*256+I)/10-40)*9/5 + 32,0
0179,EGT21 support,0,1,bit,{A:0},0
0179,EGT22 support,0,1,bit,{A:1},0
0179,EGT23 support,0,1,bit,{A:2},0
0179,EGT24 support,0,1,bit,{A:3},0
0179,EGT21 Temp,-40,6513,F,((B*256+C)/10-40)*9/5 + 32,0
0179,EGT22 Temp,-40,6513,F,((D*256+E)/10-40)*9/5 + 32,0
0179,EGT23 Temp,-40,6513,F,((F*256+G)/10-40)*9/5 + 32,0
0179,EGT24 Temp,-40,6513,F,((H*256+I)/10-40)*9/5 + 32,0
0110,Instantaneous MPG,0,100,mpg,MPG,0
0110,Average MPG,0,100,mpg,AMPG,0
0105,Trans temperature,-40,500,ЎF,(A-40)*9/5 + 32,TCM
01B4,Trans temperature (1),-40,500,ЎF,(A-40)*9/5 + 32,0

[omegis83]

Some of the PIDs are wrong on OBD Fusion though so I may try some of yours

[doug97gxe]

I used both of yours the boost A sensor has me idling at 4.5 and peaking at 30 .. that doesn't seem right and the user pid has me idling at 30 and peaking at 0

Well it's better than nothing I guess


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[omegis83]

I used both of yours the boost A sensor has me idling at 4.5 and peaking at 30 .. that doesn't seem right and the user pid has me idling at 30 and peaking at 0

Well it's better than nothing I guess


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Try this

[doug97gxe]

Try this

added... will try tomorrow.. thanks for all your help

[doug97gxe]

Try this

This is much better thank you




Weird thing the CSV didn't have Boost though I was logging it



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[speedy0339]

Does anyone know how to get it to work for the tranny Temp?

[jabicho]

Can anybody post these pids on a *csv file so as to try and add them to Torque???

[kelseysautobody]

Anyone know what PID to use for EGT's on OBD fusion? I tried bank 1 + 2 sensor 1 and get no data.

[Rodizzle]

Anyone else have any new Custom PID , they discovered and what should my boost be at when idling , 0 ?

[UkuRiSh]

added... will try tomorrow.. thanks for all your help

For some reason it's not working For me ) I'm getting 30 all the time ! any updates with boost ? I would like to see vac as well

[doug97gxe]

For some reason it's not working For me ) I'm getting 30 all the time ! any updates with boost ? I would like to see vac as well

Mine works but aren't you Turbo? Not sure if that makes a difference


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[UkuRiSh]

Mine works but aren't you Turbo? Not sure if that makes a difference


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At the moment without turbo, I will install the turbo closer to the fall and there is no difference if turbo or non turbo the difference will be boost curve. IAT works fine for me, there is the way I can change to celsius?

[doug97gxe]

At the moment without turbo, I will install the turbo closer to the fall and there is no difference if turbo or non turbo the difference will be boost curve. IAT works fine for me, there is the way I can change to celsius?

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[UkuRiSh]

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Yes I did that and getting number 30 (

[doug97gxe]

Yes I did that and getting number 30 (

Only difference I can see is spaces in the formula but I doubt that could be an issue


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