I have a 2005 Tacoma 4.0L dual Wideband upstream sensors.
3-5 L/M fuel cell working perfect. I purchased a Quad EFIE. I have identified 4 leads from sensor, Blk, Blk which are the Heater and Blue and white, blue being the active lead that I want. I receive 3.3v to ground. I understand you can not use voltage as a reference when your meter is on the terminal block post 3 and 4, however when I do and turn the course pot adjustment 1/4 turn voltage jumps to 4.4vdc. I have no idea what this means, but it is what it is. I broke my active blue lead and installed connector mating lugs to be used as a test point. I placed a Fluke 87 DMM in series to measure current and I am able to view and adjust current levels using this method. According to this posting you are saying I should be adding 5.3ma to the sensor output? There are no obvious idle changes when I make my adjustments. I attempted to hook up a F/A gauge to monitor ratio, but can not get it to work. I do not see a 0-1vdc out. What lead would have this output? I have checked all 4 leads from the sensor and have never seen or received a fluctuating 0-1vdc reading.
(01-13-2009 09:38 AM)mike Wrote: As a note: You can probably set these EFIEs too high without putting the ECU into open loop. Basically, open loop is a safety net, where the ECU is able to see parameters that it doesn't understand, and will then protect itself by ignoring the sensors, and adding more gas.
The reason I stated that you could over lean your engine with these devices is that we have found in our testing so far, that they don't trigger an error in the ECU, causing it to go into open loop.
I'm not trying to be overly cautious. I just want you to understand that you can't use "open loop" or engine codes to determine when the Wide Band EFIE is set too high. Because it doesn't trigger them, even when set too high.
One method we used in the early testing: Let the engine idle with the EFIE pot turned fully counter-clockwise. Then gradually turn the pot clockwise until you hear the engine idle speed lower. Then back it off (counter-clockwise) about a 1/4 turn or so. This should be a pretty safe setting (not too lean). If you drive for a tankful or two and don't get the mileage you are expecting, then add another 1/8 turn clockwise and try again. I wouldn't go any higher than that for an extended period of time.
Let me know if you use this and you find it helpful. I may add some of this to the instructions.
I also got confused by what you meant by "left" and "right". So lets stick with CW (clockwise) and CCW (counter-clockwise).
You should turn your pot all the way CCW to get almost no effect.
You can then turn it slowly CW, with the engine running, until you hear the engine idle speed slow down. Then turn it CCW about 1/4 turn. In other words, you're now going to back it off about 1/4 turn. This should be a pretty good setting for you.