checksix

It's my understanding that the resistors are there to simulate the presence of the heater element in the o2 sensor (the two white wires on the sensor connector), so I suppose that's why they get warm. The other two pins are left unconnected, and present a reading of 0 volts (full lean) to the ecu, causing the ecu to attempt to compensate by going full rich. The power commander then makes the final adjustment to the injectors. Obligatory caveat: I'm not an EE. I just google alot.

I just wanted to thank Kanadian Ken for this outstanding "monitor wire fix" writeup. My '07 with 18K miles just blew another headlight bulb (first pair blew at 10K miles) and I noticed the voltage was running between 14.6 and 15.1 on my Lascar voltmeter so I started to get worried. I applied the fix and the voltage now runs between 14.3 and 14.7 (ie. .3-.4 volts lower). Why Honda runs the R/R monitor wire through the entire wiring harness including the ignition switch is beyond me. Anyway, this site is the greatest, and guys like KK who contribute this kind of information to the VFR knowledge pool deserve special appreciation!

For a second I thought I was on the wrong forum looking at a NASA space shuttle cockpit.

I'm not sure if this will help the discussion or not, but FWIW here are the readings I get on my 3 month old stock 2007 VFR (no mods): resting voltage (overnight) 12.8 ignition on, not running 12.2 fully warmed up, @idle 14.6 @idle w/ hi-beams 13.3 @5000 rpm 14.6 @5000 w/ hi-beams 14.6