First off I have read and re-read every possible thread related to logging AFR through the EGR, I cannot for the life of me figure out what I am missing.
The only difference I see is that some people's HP Tuner Editor seem to have an EGR enable/disable function where I only see Diag Disable Speed and Diag Enable Speed under the EXHAUST > Gas Recirculation tab.
I have an AEM 30-0300 wideband with the white (+) wire going to Pin 55 (blue connector) on my P01 ecu and the brown (-) going to Pin 23 (blue connector)
I set up the unused math parameters as such: variable: ([2811.10]*2.3750)+7.3125 - EGR Sensor Volts - 14.7 stoich
I added the EGR sensor voltage channel, but have never been able to log anything other than 0. Also added the above parameter to the chart and same thing, always 0.
The AFR gauge is working properly.
Please help me find what I am missing.
2002 GMC Sierra 5.3
Below is the instructions I followed.
Step 1 Wiring The AEM 30-300 has two wires for Analog out, the White wire for Analog 5v signal and a brown wire for the analog ground. On a P59 with the blue/green connectors, the white wire must be connected to pin 55 on the blue connector. The brown wire needs to be connected to pin 41 on the blue connector as well.
On my PSI harness, they have unused pins blocked off with a rubber plug, I guess to keep dust and water out. I had harvested extra pin pigtails from an old harness. If you need some let me know, could drop a few in the mail. Anyway, I took a small drill bit to punch hole in the rubber seal and pushed the pig tails through for 55 and 41. I prefer to solider everything, you are dealing with small voltage numbers so I wouldn?t try crimping any connections it could skew your numbers.
Step 2 Changing the tune
Since the wideband will be logging to the EGR, you need to go into your tune and turn on EGR. I think after 2001 trucks didn?t have EGR so this actually needs to be enabled (Engine> Gas Recirculation>>General). Double check your DTC codes for EGR are disabled or you?d probably throw a code.
Step 3 Setting up VCM scanner.
For this to work, you need to log EGR voltage, add the Channel ?EGR Sensor? , make sure the units are volts. Next you need to setup a user math parameter that will take the EGR voltage and calculate the AFR based on AEM?s formula you can find in the Wideband documentation.
?Tools>Math parameters? Select one of the unused User Maths. I named mine ?Windband AFR? and gave the abbreviation ?AFR?. Take this next line and cut and paste it into the Expressions field. Make sure to copy everything including the open parenthesis
([2811.10]*2.3750)+7.3125
Set the Unit to ?Air-Fuel ratio 14.7 -Gasoline? and the decimals to ?2?
The only place I?m currently showing my AFR in VCM scanner is in the Chart vs Time. Go to your chart layout and add new series or replace one of yours if you are out of space. Make the Label AFR, Parameter, you?ll put the Wideband AFR from the User defined maths you created earlier. Decimals 2, filter 0ms, Max 18 min 8.5. Close the layout editor and you should be done. Save your updated layout so its still there when you re-open VCM scanner
Step 4 Confirm its working
Basically, you will see the AFR chart start running across the screen. If you start logging before the AEM warms up it will be flatlined. Once the display on the AEM is working, VCM should have data in it now. If the chart isn?t showing data from the maths then look at the EGR Sensor channel, it should be reading around 3 volts at 14.65 AFR.
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