[Alex0413]

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?

 

[vilord]

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.

 

[Tom-Layla Brough]

I'd also look very carefully for a broken injector lead...

 

[Alex0413]

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?

 

[Alex0413]

I'd also look very carefully for a broken injector lead...

I haven't check this either, but wouldn't I get a cylinder mis-fire code and not a MAP code from an injector?