Connecting wideband via EGR or A/C Pressure in HP Tuners
03-31-2011, 08:28 PM
#84
Burning Brakes
Finally got this to work, but its reading extremely high compared to my Dynotech WIDEBAND II, the gauge is reading 13.4 at idle and in the scanner I'm seeing 16-17, who do I trust????
If it makes any difference the 02 is in the X-pipe, its a Kooks O/R x-pipe w/Kooks headers.
If it makes any difference the 02 is in the X-pipe, its a Kooks O/R x-pipe w/Kooks headers.
04-01-2011, 10:43 AM
#85
Le Mans Master
Always trust the wideband gauge. The WB is before the cats if you have them right? You will need to verify the function is correct in HPT to match your wideband's output. Do you have a link to the manual for the WB?
04-01-2011, 03:37 PM
#86
Burning Brakes
Sorry, was a typo on my part, its a DynoJET.... but yea, no cats and put it in the alotted hole for the wideband. I used the formula on the sticky for running it through EGR. I didnt try any wot pulls, just idle to see if it worked then had other stuff to do. The car runs rich all the time after warm, but is steady 11.6 at WOT. Who knows, maybe I'll figure it out. Here is a link to the wideband set up I have.
http://www.dynojetwb2.com/wb2_details.aspx
http://www.dynojetwb2.com/wb2_details.aspx
04-01-2011, 04:11 PM
#87
Le Mans Master
The formula is specific to each wideband and the AFR range the voltage range spans.
The manual: http://www.powercommander.com/downlo...8200017.03.pdf
Says: AFR= (Volts * 1.6)+10 or to put it anotherway; Volts/.625+10
The manual: http://www.powercommander.com/downlo...8200017.03.pdf
Says: AFR= (Volts * 1.6)+10 or to put it anotherway; Volts/.625+10
04-01-2011, 04:17 PM
#89
Le Mans Master
Yes, instead of [pid.nnnn]/.5+10 it should be [pid.nnnn]/.625+10 or [pid.nnnn]*1.6+10 where pid.nnnn is either the EGR or AC pressure pid depending on which you're using.
If it is still off after changing the equation and it is off by less than 1 AFR then adjust the +10 up or down until it matches to take into account voltage offset.
If it is still off after changing the equation and it is off by less than 1 AFR then adjust the +10 up or down until it matches to take into account voltage offset.
08-16-2012, 07:08 PM
#91
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Thanks for any advice.
01-12-2013, 10:21 PM
#92
Burning Brakes
Not to bring back an old thread, but is anybody else seeing a voltage increase through the EGR pin versus gauge reading? With the LC1, you connect to your laptop and command a certain voltage. If I command 3v, my DB gauge reads a few tenths lower than it should, and my HPT scanner reads a few tenths higher, at ~3.15v. When I use the Logworks program for the LC1, I get a reading inbetween the two, which is the one I'm going to trust.
I'm leaving it as is for the moment since my WBO2 is placed post-cat (not good I know, but going with ORX soon) so I'm tuning a tad on the rich side to hopefully compensate for the leaner reading.
None the less, I thought it was strange that there's a voltage increase. Issue with the LC1 maybe?
I'm leaving it as is for the moment since my WBO2 is placed post-cat (not good I know, but going with ORX soon) so I'm tuning a tad on the rich side to hopefully compensate for the leaner reading.
None the less, I thought it was strange that there's a voltage increase. Issue with the LC1 maybe?
10-03-2014, 05:12 PM
#93
3rd Gear
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aem wideband through egr
I wrote this a while back just for personal information. This is based on HP Tuners.
UPDATED
Reading a Wideband through the EGR or A/C Pressure Switch
EGR
• The EGR wire is located at Pin 55 on the Blue connector of the PCM (NOTE: on the 97-98 Corvettes this will be Pin 9 on the Blue connector).
• On vehicles that come with an EGR (Camaro's, etc.), there will be a Brown wire at Pin 55, it is designated “EGR Pintle Position Sensor Signal” in a pinout schematic.
• If your vehicle did not come equipped with an EGR (Corvette), there will not be a wire and the schematic will say "Not Used". Just add a wire to the PCM at Pin 55 (or 9), everything still works the same. I went to a junkyard and found a plug under the hood of a GM vehicle with the same type of ends as the PCM wires. Click here for instructions on how to gain access to your PCM.
• Connect the Wideband 02 wire with the 0-5v output to the EGR wire at Pin 55(or 9). This may be all you need to do with some widebands, some others require a ground. Check the wiring schematic for your specific unit.
A/C Pressure Switch
• There are 3 wires connected to the A/C Pressure sensor. The Red wire with Black stripe that is going to the PCM is the one we want to use. You can go to a junkyard and find another connector to plug into this so you can switch back and forth or you can buy a Maintain switch that, when you switch it one way it reads from the A/C sensor and when switched the other way, it reads from the Wideband O2 output wire. Either way will work fine, so that you can easily put it back to normal when you are done tuning.
HP Tuner Scanner
• Now that the wiring is done, you need to set it up in HP Tuners. You will need some information on your specific wideband that will be in the widebands paperwork. You will have to set up a formula to change the voltage (0-5v) into your AFR wideband reading. It will look like this:
VOLTS / (VOLTAGE RANGE/DEVICE RANGE) + (MINIMUM VALUE OF DEVICE READING) = AFR
VOLTS = the voltage that the wideband 02 sensor is putting out to the EGR wire
VOLTAGE RANGE = typically 5v (0-5v), some people use the narrowband 02 input (not recommended) which is 1v (0-1v)
DEVICE RANGE = the range your wideband is set to read. If the wideband is set to read from 10 – 20 AFR, then the range will be 10. If set to read from 8 – 22 AFR, the range will be 14, etc.
MINIMUM VALUE OF DEVICE READING = the lowest number that your wideband is set to read. In the above examples, it would be 10 for the first example, and 8 for the second.
I am using a PLX SM-AFR 250 that is set to read AFR from 10-20, so I will use it for my example. The formula will be:
VOLTS / (5/10) + 10 = AFR or,
(VOLTS / .5) + 10 = AFR
• Since HP Tuners Scanner will be using the EGR or AC Pressure switch to get its readings from, we need to add that into the formula. The PID for the EGR on LS1 based cars is PID.2811 (EGR Position). Now the formula reads like this:
([PID.2811]/.5)+10 = AFR
• The formula for the A/C Pressure switch is the same, you will just have to change the PID to PID.7101.
([PID.7101]/.5)+10 = AFR
Custom PID
• Open Table Display in VCM Scanner
• Right click any blank line and choose Insert
• This will open the Insert PIDs display
• Here you will see PID List, AUX Input List and User Defined. Click the + next to User Defined to open the drop down list
• Double click Configure User Defined to open Configure User Defined Parameters
• Click on one of the numbers with <undefined> next to it
• For Name:, put the name of your choice, say, Air Fuel Ratio
• For Abbrv:, put AFR
• For Sensor:, open the drop down box and choose "None"
• For Units:, open the drop down box and choose ":1"
• Under Function:, insert your formula. For EGR it is ([PID.2811]/.5)+10
• If you are using the A/C Pressure switch, use the formula: ([PID.7101]/.5)+10
• That’s it, just click the Up Arrow to commit changes, then click the X at the top right to close the box and click the Save icon on the Histogram Configuration page.
• To make a custom PID for AFR % Error make your way back to the Configure User Defined parameters page. There will already be an Air Fuel Ratio Error PID. Open it and look at the information in the Function box.
• Copy this formula EXACTLY. It will look like this:
100*([SENS.120]-[SENS.121])/[SENS.121]
• Since SENS.120 is the AFR SENSOR we want to create a new Custom PID and substitute our new formula in place of SENS.120, then enter this into the Function box. Now it will look like this:
100*((([PID.2811]/.5)+10)-[SENS.121])/[SENS.121] or
100*((([PID.7101]/.5)+10)-[SENS.121])/[SENS.121] for the A/C Pressure switch. If you have trouble, double check all your parenthesis. It is best to copy/paste this formula.
• On this Custom PID, give it a name, use AFR%Error for the Abbrv, leave Sensor blank, and use % for Units.
• Now, you can change the information in your VE and MAF Histograms to use the custom PIDs that you just made.
• ATTENTION: In Editor (Engine/General), you have to enable EGR. Also, don’t forget that each of these below will have to be logged in Table Display:
- EGR Position, if your are using EGR Pinout 55 (or 9). Located: (PID List/Engine/Emissions/EGR Position (V))
- A/C Pressure, if you are using the A/C Pressure switch. Located: (PID List/System/AC/AC Pressure (V))
- AFR
- AFR % Error
- AFR Commanded
UPDATED
Reading a Wideband through the EGR or A/C Pressure Switch
EGR
• The EGR wire is located at Pin 55 on the Blue connector of the PCM (NOTE: on the 97-98 Corvettes this will be Pin 9 on the Blue connector).
• On vehicles that come with an EGR (Camaro's, etc.), there will be a Brown wire at Pin 55, it is designated “EGR Pintle Position Sensor Signal” in a pinout schematic.
• If your vehicle did not come equipped with an EGR (Corvette), there will not be a wire and the schematic will say "Not Used". Just add a wire to the PCM at Pin 55 (or 9), everything still works the same. I went to a junkyard and found a plug under the hood of a GM vehicle with the same type of ends as the PCM wires. Click here for instructions on how to gain access to your PCM.
• Connect the Wideband 02 wire with the 0-5v output to the EGR wire at Pin 55(or 9). This may be all you need to do with some widebands, some others require a ground. Check the wiring schematic for your specific unit.
A/C Pressure Switch
• There are 3 wires connected to the A/C Pressure sensor. The Red wire with Black stripe that is going to the PCM is the one we want to use. You can go to a junkyard and find another connector to plug into this so you can switch back and forth or you can buy a Maintain switch that, when you switch it one way it reads from the A/C sensor and when switched the other way, it reads from the Wideband O2 output wire. Either way will work fine, so that you can easily put it back to normal when you are done tuning.
HP Tuner Scanner
• Now that the wiring is done, you need to set it up in HP Tuners. You will need some information on your specific wideband that will be in the widebands paperwork. You will have to set up a formula to change the voltage (0-5v) into your AFR wideband reading. It will look like this:
VOLTS / (VOLTAGE RANGE/DEVICE RANGE) + (MINIMUM VALUE OF DEVICE READING) = AFR
VOLTS = the voltage that the wideband 02 sensor is putting out to the EGR wire
VOLTAGE RANGE = typically 5v (0-5v), some people use the narrowband 02 input (not recommended) which is 1v (0-1v)
DEVICE RANGE = the range your wideband is set to read. If the wideband is set to read from 10 – 20 AFR, then the range will be 10. If set to read from 8 – 22 AFR, the range will be 14, etc.
MINIMUM VALUE OF DEVICE READING = the lowest number that your wideband is set to read. In the above examples, it would be 10 for the first example, and 8 for the second.
I am using a PLX SM-AFR 250 that is set to read AFR from 10-20, so I will use it for my example. The formula will be:
VOLTS / (5/10) + 10 = AFR or,
(VOLTS / .5) + 10 = AFR
• Since HP Tuners Scanner will be using the EGR or AC Pressure switch to get its readings from, we need to add that into the formula. The PID for the EGR on LS1 based cars is PID.2811 (EGR Position). Now the formula reads like this:
([PID.2811]/.5)+10 = AFR
• The formula for the A/C Pressure switch is the same, you will just have to change the PID to PID.7101.
([PID.7101]/.5)+10 = AFR
Custom PID
• Open Table Display in VCM Scanner
• Right click any blank line and choose Insert
• This will open the Insert PIDs display
• Here you will see PID List, AUX Input List and User Defined. Click the + next to User Defined to open the drop down list
• Double click Configure User Defined to open Configure User Defined Parameters
• Click on one of the numbers with <undefined> next to it
• For Name:, put the name of your choice, say, Air Fuel Ratio
• For Abbrv:, put AFR
• For Sensor:, open the drop down box and choose "None"
• For Units:, open the drop down box and choose ":1"
• Under Function:, insert your formula. For EGR it is ([PID.2811]/.5)+10
• If you are using the A/C Pressure switch, use the formula: ([PID.7101]/.5)+10
• That’s it, just click the Up Arrow to commit changes, then click the X at the top right to close the box and click the Save icon on the Histogram Configuration page.
• To make a custom PID for AFR % Error make your way back to the Configure User Defined parameters page. There will already be an Air Fuel Ratio Error PID. Open it and look at the information in the Function box.
• Copy this formula EXACTLY. It will look like this:
100*([SENS.120]-[SENS.121])/[SENS.121]
• Since SENS.120 is the AFR SENSOR we want to create a new Custom PID and substitute our new formula in place of SENS.120, then enter this into the Function box. Now it will look like this:
100*((([PID.2811]/.5)+10)-[SENS.121])/[SENS.121] or
100*((([PID.7101]/.5)+10)-[SENS.121])/[SENS.121] for the A/C Pressure switch. If you have trouble, double check all your parenthesis. It is best to copy/paste this formula.
• On this Custom PID, give it a name, use AFR%Error for the Abbrv, leave Sensor blank, and use % for Units.
• Now, you can change the information in your VE and MAF Histograms to use the custom PIDs that you just made.
• ATTENTION: In Editor (Engine/General), you have to enable EGR. Also, don’t forget that each of these below will have to be logged in Table Display:
- EGR Position, if your are using EGR Pinout 55 (or 9). Located: (PID List/Engine/Emissions/EGR Position (V))
- A/C Pressure, if you are using the A/C Pressure switch. Located: (PID List/System/AC/AC Pressure (V))
- AFR
- AFR % Error
- AFR Commanded
06-07-2015, 01:22 PM
#94
Racer
Question on 08 C6 LS3 PCM connectors
I am at the point of connecting the Brown output from my AFR controller. Which connector on the pcm J1 black or J2 white do I connect to pin 55?
Thanks!
Thanks!
06-19-2015, 01:57 PM
#95
AMP Racing
Member Since: Aug 2006
Location: Washington TWP NJ
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2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
Fuel Pressure Logging and wiring through EGR PCM pinouts.
http://www.holdencrazy.com/EFILive/T...itTutorial.zip is the tutorial that TAQ did.
Autometer Fuel Sending unit 2246
You need the harness as well PN 5223
Here is log showing a big problem with my fuel system
http://www.holdencrazy.com/EFILive/T...itTutorial.zip is the tutorial that TAQ did.
Autometer Fuel Sending unit 2246
You need the harness as well PN 5223
Here is log showing a big problem with my fuel system
08-13-2015, 12:05 PM
#98
AMP Racing
Member Since: Aug 2006
Location: Washington TWP NJ
Posts: 10,446
Received 466 Likes
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2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
For those of you wishing to install a fuel pressure sensor into your pcm via pin 55, here's a link.
https://www.corvetteforum.com/forums...-pcm-pins.html
https://www.corvetteforum.com/forums...-pcm-pins.html
02-03-2016, 10:23 AM
#99
Racer
Version 3.0 UPDATE
Guys/gals
Just an fyi. You'll have to make a math formula for this to work.
I'm using the a/c pressure sensor.
Just select your Parameter, (automatically selects the value of the parameter) then enter the rest of your formula without spaces. I'll post a screenshot later.
Just an fyi. You'll have to make a math formula for this to work.
I'm using the a/c pressure sensor.
Just select your Parameter, (automatically selects the value of the parameter) then enter the rest of your formula without spaces. I'll post a screenshot later.
02-15-2016, 09:14 PM
#100
Racer
Guys/gals
Just an fyi. You'll have to make a math formula for this to work.
I'm using the a/c pressure sensor.
Just select your Parameter, (automatically selects the value of the parameter) then enter the rest of your formula without spaces. I'll post a screenshot later.
Just an fyi. You'll have to make a math formula for this to work.
I'm using the a/c pressure sensor.
Just select your Parameter, (automatically selects the value of the parameter) then enter the rest of your formula without spaces. I'll post a screenshot later.