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Discussion Starter · #1 ·
Hi, I've been lurking this forum, and this is my first post. Recently bought a 2012 Ranger 800 4x4 and as soon as I got it home it started missing on idle, no power, running really rough, and a check engine light on. Pulled the code and got "102 04", Which is low voltage at the MAP. After reading on this forum I saw it's a common problem and that the wiring and connectors go bad. So today I put in a new Bosch MAP and a new harness pig tail... Started it up and zero change! Still runs rough, check engine light on, and still getting the same code! (I did unhook battery before I changed everything to reset ECM). I also checked for vacuum leaks on the intake boot with carb cleaner and found none.. Pulled the plugs and they were new and looked good...

Why after a new sensor and harness pigtail am I still having the problems? Should I change all the wires back to the ECM? What else could be causing these issues?
 

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2005 Ranger XP 800
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I've heard that sometimes this can happen because of a bad connection of the engine ground of the harness near the ECU. The guy who mentioned it loosened up the ground wire, took a little sandpaper to the frame and to the grounding eye, then put it back together and that solved his problem.
 

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Discussion Starter · #4 ·
I've heard that sometimes this can happen because of a bad connection of the engine ground of the harness near the ECU. The guy who mentioned it loosened up the ground wire, took a little sandpaper to the frame and to the grounding eye, then put it back together and that solved his problem.
I haven't checked any grounds yet. This ground is near the ECU coming right off it, presumably?
 
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