REM ???

[mark 39]

       Finally tried the REM that I got last December. How does all that info fit in such a small box?  A few questions mainly for my edification.

              1) ST  Fuel trim default is 128. Should real time running number be higher or lower if everything is working properly ?

              2) Is the voltage reading on REM for O2 sensor (12v-5v) from before the final connection to the sensor ? ( Back probe sensor side if in doubt ?)

              3) Where did those of you with a REM route the cord through the firewall , dash, etc.

      Thanks for answers and any hints for using this toy to advantage.           Mark

[87MJTIM]

1. The default fuel trims are 128.  ST adjusts faster.  LT adjusts based on the ST trend.  Fuel trims <128 = rich condition; >128 = lean condition

 

2.  The O2 heater relay operates on 12v.  The o2 sensor operates on 0v - 5v.  It should keep jumping from low to high.

 

3. I routed the wire along the firewall, over the booster, then through a hole in the top of the firewall next to the fuse box.  I then routed under the dash into the back of the ash tray, where i have the REM sitting.

[fiatslug87]

Routed mine along the firewall then through the bung just above the speedometer cable, the orange wire in the first picture. Then modified a switch panel dummy plug to fit a cat5 keystone connector. I need to move it between three MJs so I have the same set up in each.

[Strokermjcomanche]

Answer 3 , in my center console .