OBDII CarPC MPG Calculator - Page 2 - Fuelly Forums

Click here to see important news regarding the aCar App

Reply
 
Thread Tools Display Modes
 
Old 10-05-2007, 07:02 PM   #11
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
Wow, you are awesome. I just got an email back from the developer and he said to look at stty also.

Thanks!
__________________

__________________
Fourthbean is offline   Reply With Quote
Old 10-06-2007, 01:11 AM   #12
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
thanx,

BTW, the MPG function I mentioned has a bug, they never convert tSpeed from kph to mph.

ref: http://prj.perquin.com/obdii/ under the "Tester Commands" section
__________________

__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 10-06-2007, 07:36 PM   #13
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
Using your advice with the command stty I got to the point of seeing the raw traffic from the scanner with minicom. I put the command into the perl script and it doesn't complain about it but it errors trying to find readable codes. I will work more on it later.
__________________
Fourthbean is offline   Reply With Quote
Old 10-06-2007, 08:52 PM   #14
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Fourthbean -

Can you tell me which you bought? Did you buy this one for GM products? :

ElmScan VPW Scan Tool - P/N: 420300
http://www.scantool.net/products/pro...products_id=12

Thanks,

CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? https://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 10-06-2007, 09:23 PM   #15
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
Yes, that is the one I bought. And I opted for no case to knock off 15 bucks from the price (I am cheap).
__________________
Fourthbean is offline   Reply With Quote
Old 10-19-2007, 03:59 AM   #16
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
I have been poking around and it looks like what I need is to find what PID coming from my OBDII port is the injector duty cycle/pulse width or something of the sorts. Looks like it should be there, but it is not published anywhere so I will need to find it .

The scanner I have can be set to monitor all parameters being spat out from the port, so I guess I would need to turn that on and log it and then decipher and eliminate until I could find what I need (assuming it is there somewhere). Might be a bigger job than I think.
__________________
Fourthbean is offline   Reply With Quote
Old 10-19-2007, 05:33 AM   #17
Registered Member
 
skewbe's Avatar
 
Join Date: Jan 2007
Posts: 771
Country: United States
Yes logging would be good.

Look for the following PIDS coming out of your computer:
$PID07 (fuel trim)
$PID0D (Vehicle Speed)
$PID10 (MAF)


if you don't have PID10 (MAF) then look to see if you have:
$PID07 (fuel trim)
$PID0D (Vehicle Speed)
$PID0B (Manifold Pressure)
$PID0F (intake air temp)
$PID0C (RPM)
__________________
Standard Disclaimer
skewbe is offline   Reply With Quote
Old 10-20-2007, 01:40 AM   #18
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Fourthbean -

In the "scantool" program I can run in DOS or Windows, I get source code. The BOLD values are the ones I am receiving from elmscan in scantool :

Code:
static SENSOR sensors[] =
{
   // formula                        // label            //screen_buffer  //pid  //enabled // bytes
   { throttle_position_formula,     "Absolute Throttle Position:",     "", "11",      1,    1 },
   { engine_rpm_formula,            "Engine RPM:",                     "", "0C",      1,    2 },
   { vehicle_speed_formula,         "Vehicle Speed:",                  "", "0D",      1,    1 },
   { engine_load_formula,           "Calculated Load Value:",          "", "04",      1,    1 },
   { timing_advance_formula,        "Timing Advance (Cyl. #1):",       "", "0E",      1,    1 },
   { intake_pressure_formula,       "Intake Manifold Pressure:",       "", "0B",      1,    1 },
   { air_flow_rate_formula,         "Air Flow Rate (MAF sensor):",     "", "10",      1,    2 },
   { fuel_system1_status_formula,   "Fuel System 1 Status:",           "", "03",      1,    2 },
   { fuel_system2_status_formula,   "Fuel System 2 Status:",           "", "03",      1,    2 },
   // Page 2
   { short_term_fuel_trim_formula,  "Short Term Fuel Trim (Bank 1):",  "", "06",      1,    2 },
   { long_term_fuel_trim_formula,   "Long Term Fuel Trim (Bank 1):",   "", "07",      1,    2 },
   { short_term_fuel_trim_formula,  "Short Term Fuel Trim (Bank 2):",  "", "08",      1,    2 },
   { long_term_fuel_trim_formula,   "Long Term Fuel Trim (Bank 2):",   "", "09",      1,    2 },
   { intake_air_temp_formula,       "Intake Air Temperature:",         "", "0F",      1,    1 },
   { coolant_temp_formula,          "Coolant Temperature:",            "", "05",      1,    1 },
   { fuel_pressure_formula,         "Fuel Pressure (gauge):",          "", "0A",      1,    1 },
   { secondary_air_status_formula,  "Secondary air status:",           "", "12",      1,    1 },
   { pto_status_formula,            "Power Take-Off Status:",          "", "1E",      1,    1 },
   // Page 3
   { o2_sensor_formula,             "O2 Sensor 1, Bank 1:",            "", "14",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 2, Bank 1:",            "", "15",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 3, Bank 1:",            "", "16",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 4, Bank 1:",            "", "17",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 1, Bank 2:",            "", "18",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 2, Bank 2:",            "", "19",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 3, Bank 2:",            "", "1A",      1,    2 },
   { o2_sensor_formula,             "O2 Sensor 4, Bank 2:",            "", "1B",      1,    2 },
   { obd_requirements_formula,      "OBD conforms to:",                "", "1C",      1,    1 },
   // Page 4
   { o2_sensor_wrv_formula,         "O2 Sensor 1, Bank 1 (WR):",       "", "24",      1,    4 },    // o2 sensors (wide range), voltage
   { o2_sensor_wrv_formula,         "O2 Sensor 2, Bank 1 (WR):",       "", "25",      1,    4 },
   { o2_sensor_wrv_formula,         "O2 Sensor 3, Bank 1 (WR):",       "", "26",      1,    4 },
   { o2_sensor_wrv_formula,         "O2 Sensor 4, Bank 1 (WR):",       "", "27",      1,    4 },
   { o2_sensor_wrv_formula,         "O2 Sensor 1, Bank 2 (WR):",       "", "28",      1,    4 },
   { o2_sensor_wrv_formula,         "O2 Sensor 2, Bank 2 (WR):",       "", "29",      1,    4 },
   { o2_sensor_wrv_formula,         "O2 Sensor 3, Bank 2 (WR):",       "", "2A",      1,    4 },
   { o2_sensor_wrv_formula,         "O2 Sensor 4, Bank 2 (WR):",       "", "2B",      1,    4 },
   { engine_run_time_formula,       "Time Since Engine Start:",        "", "1F",      1,    2 },
   // Page 5
   { frp_relative_formula,          "FRP rel. to manifold vacuum:",    "", "22",      1,    2 },    // fuel rail pressure relative to manifold vacuum
   { frp_widerange_formula,         "Fuel Pressure (gauge):",          "", "23",      1,    2 },    // fuel rail pressure (gauge), wide range
   { commanded_egr_formula,         "Commanded EGR:",                  "", "2C",      1,    1 },
   { egr_error_formula,             "EGR Error:",                      "", "2D",      1,    1 },
   { evap_pct_formula,              "Commanded Evaporative Purge:",    "", "2E",      1,    1 },
   { fuel_level_formula,            "Fuel Level Input:",               "", "2F",      1,    1 },
   { warm_ups_formula,              "Warm-ups since ECU reset:",       "", "30",      1,    1 },
   { clr_distance_formula,          "Distance since ECU reset:",       "", "31",      1,    2 },
   { evap_vp_formula,               "Evap System Vapor Pressure:",     "", "32",      1,    2 },
   // Page 6
   { o2_sensor_wrc_formula,         "O2 Sensor 1, Bank 1 (WR):",       "", "34",      1,    4 },   // o2 sensors (wide range), current
   { o2_sensor_wrc_formula,         "O2 Sensor 2, Bank 1 (WR):",       "", "35",      1,    4 },
   { o2_sensor_wrc_formula,         "O2 Sensor 3, Bank 1 (WR):",       "", "36",      1,    4 },
   { o2_sensor_wrc_formula,         "O2 Sensor 4, Bank 1 (WR):",       "", "37",      1,    4 },
   { o2_sensor_wrc_formula,         "O2 Sensor 1, Bank 2 (WR):",       "", "38",      1,    4 },
   { o2_sensor_wrc_formula,         "O2 Sensor 2, Bank 2 (WR):",       "", "39",      1,    4 },
   { o2_sensor_wrc_formula,         "O2 Sensor 3, Bank 2 (WR):",       "", "3A",      1,    4 },
   { o2_sensor_wrc_formula,         "O2 Sensor 4, Bank 2 (WR):",       "", "3B",      1,    4 },
   { mil_distance_formula,          "Distance since MIL activated:",   "", "21",      1,    2 },
   // Page 7
   { baro_pressure_formula,         "Barometric Pressure (absolute):", "", "33",      1,    1 },
   { cat_temp_formula,              "CAT Temperature, B1S1:",          "", "3C",      1,    2 },
   { cat_temp_formula,              "CAT Temperature, B2S1:",          "", "3D",      1,    2 },
   { cat_temp_formula,              "CAT Temperature, B1S2:",          "", "3E",      1,    2 },
   { cat_temp_formula,              "CAT Temperature, B2S2:",          "", "3F",      1,    2 },
   { ecu_voltage_formula,           "ECU voltage:",                    "", "42",      1,    2 },
   { abs_load_formula,              "Absolute Engine Load:",           "", "43",      1,    2 },
   { eq_ratio_formula,              "Commanded Equivalence Ratio:",    "", "44",      1,    2 },
   { amb_air_temp_formula,          "Ambient Air Temperature:",        "", "46",      1,    1 },  // same scaling as $0F
   // Page 8
   { relative_tp_formula,           "Relative Throttle Position:",     "", "45",      1,    1 },
   { abs_tp_formula,                "Absolute Throttle Position B:",   "", "47",      1,    1 },
   { abs_tp_formula,                "Absolute Throttle Position C:",   "", "48",      1,    1 },
   { abs_tp_formula,                "Accelerator Pedal Position D:",   "", "49",      1,    1 },
   { abs_tp_formula,                "Accelerator Pedal Position E:",   "", "4A",      1,    1 },
   { abs_tp_formula,                "Accelerator Pedal Position F:",   "", "4B",      1,    1 },
   { tac_pct_formula,               "Comm. Throttle Actuator Cntrl:",  "", "4C",      1,    1 }, // commanded TAC
   { mil_time_formula,              "Engine running while MIL on:",    "", "4D",      1,    2 }, // minutes run by the engine while MIL activated
   { clr_time_formula,              "Time since DTCs cleared:",        "", "4E",      1,    2 },
   { NULL,                          "",                                "", "",        0,    0 }
};
CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? https://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 10-20-2007, 11:11 PM   #19
Registered Member
 
Join Date: Apr 2007
Posts: 245
Country: United States
That looks to be in line with what I was getting in windows with scantool. I haven't had a chance yet to log any data from the port, the thought of sorting through it all makes me squeamish .

I guess a good way would be to get a filter to get rid of any EPA set pid values and then sort through the rest to see what is available.

I am currently working on getting the computer set up to the point I can listen to something on the way to work. So that has taken higher priority for the moment.
__________________
Fourthbean is offline   Reply With Quote
Old 10-21-2007, 12:27 AM   #20
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Fourthbean -

Quote:
Originally Posted by Fourthbean View Post
That looks to be in line with what I was getting in windows with scantool. I haven't had a chance yet to log any data from the port, the thought of sorting through it all makes me squeamish .

I guess a good way would be to get a filter to get rid of any EPA set pid values and then sort through the rest to see what is available.

I am currently working on getting the computer set up to the point I can listen to something on the way to work. So that has taken higher priority for the moment.
No problem, I am doing my own contortions. One problem I am having is that the elmscan doesn't seem to "sync" or connect to the OBDII port. If the red LED is flashing, I am connected and ready to gather data. If the red LED is solid, then the PC is unable to connect to the elmscan. I can get the flashing red LED maybe one time in 30 connects (aka plug it into the car's OBD II socket). I submitted a ticket into the scantool support service.

I am hoping this freeware offers datalogging I can post-process, until I can (hopefully) get my own program running :

http://www.obd2crazy.com/wOBDv140/index.html

Here is an example image of my car :

Attachment 998

CarloSW2
Attached Thumbnails
Click image for larger version

Name:	wOBD_example_image.jpg
Views:	489
Size:	60.2 KB
ID:	847  
__________________

__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? https://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Not very precise mpg calculation larjerr Fuelly Web Support and Community News 4 08-20-2012 01:03 AM
Keeping my distance in traffic khurt General Fuel Topics 8 09-07-2008 03:23 AM
1986 toyota celica - a work in progress 86Celica Introduce Yourself - New member Welcome 22 01-07-2007 04:43 AM
Electrical power and cars. DracoFelis Automotive News, Articles and Products 2 09-16-2006 01:31 PM
"active" aero grille slats on 06 civic concept MetroMPG General Fuel Topics 21 01-03-2006 12:02 PM

» Fuelly iOS Apps
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 09:49 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.