Complete newbie, forgive me. I have a Vi-PEC motorsport ECU for my 2013 Polaris RZR XP 900. I plan on getting the vehicle professionally tuned in the near future, but in the meantime I think I should be able to get it nominally running. Before I can do a QuickTune I need my AFR reading working properly. I have an AEM AFR gauge. It supports "0-5V" data logging. Specifically, AEM says it supports linear logging with the following data points:
min = 8.5:1 AFR = 0.5V
max = 18:1 AFR = 4.5V
In terms of wiring, from the AFR gauge:
*WHITE - Connect to Lambda + Input.
*BROWN - Connect to Lambda â€“ input. (Must be connected if Lambda + is used)
I have the WHITE wire hooked up to Expansion Connector pin #10 (AN Volt 5).
I have the BROWN wire hookup up to Expansion Connector pin #12 (Sensor GND).
I have setup "Analog Input" "AN Volt 5" as type "Lambda 1" and have set calibration to "Cal 4".
I have setup "Cal 4" thusly:
Input Value A: 0.50 V
Input Value B: 4.50 V
Output Units: Lambda
Output Value A: 0.580 Lambda
Output Value B: 1.220 Lambda
I have also tried entering AFR equivalent values for "Output Value A" and "Output Value B".
Regardless of what I set the Cal 4 Output Values to, iVTS always shows the value as the highest value there is (equivalent to the 4.5 V setting). If I give it a little gas, the value actually drops a little bit.
Googling the issue, I found something at http://www.learntotune.com/discussions/ ... -your-ecu/. According to that thread, AEM EUGOs are notorious. One post in that thread recommended the following:
AFR : 9.77 Volt : 0.00
AFR : 19.90 Volt : 5:00
I tried those settings, too, but the AFR stayed mostly at 19.9:1--again, basically the max value.
At this point I disconnected the wires from the AEM AFR gauge and measured the voltage with a multipmeter with the motor idling. It read about 2.3 V. The gauge itself read 12.5 for so. The two values seem correct. What doesn't seem correct is the value the ECU is reading.
I tried hooking up the BROWN gauge wire to a chassis ground instead. It didn't help.
Can anybody suggest a course of action for me?
Thanks in advance,