Just got back from a couple hour cruise and it performed just fine.

I kind of figured more issues would've arisen from an unseated PCM plug but so far this worked for me. When I seated it a little better an fired it up the CEL was gone and the rough idle/lack of power was gone. The plugs/pins all looked fine but I did notice my middle plug had a broken retaining clip. Then I started considering the PCM, so I took a look. I just replaced all that today to no avail, the P0303 cleared but the P0203 still posted. Again I scoured the internet and thought I'd overheated this injector (it was aftermarket) and so I ordered another plus some heat shielding. That fixed it (that's what I thought had fixed it.) until a week later when it returned, this time with an accompanying P0303. Touch the terminals (one at a time) of the harness connector with the test light. Turn the ignition switch to the ON position. Unplug the electrical connector from the fuel injector you want to test. I jumped to conclusions after reading through all kinds of posts and ended up replacing the injector. First, hook the test-light clip to a bolt or bare metal bracket on the engine. I haven't had this TJ long but recently made the drive from FL to VA over a couple of days with pretty much no issue.Īfter a couple weeks up here the P0203 posted. I had a similar issue so I thought I'd share. I'm at a loss as to where to look now!? Is it normal for if an injector was to short out within itself for it to fry the pcm driver? Any help is much appreciated!

I have also checked the plug itself and the actual wiring behind it, both were fine. When I test the volts I'm getting around 13.5v across all injectors. So, the injector in it now is fine and I know I'm getting spark to that cylinder also. I can unplug my #1 wiring and plug it to #2 injector and the cylinder begins to work. Swapped another injector in that tested fine. #2 tested like 1.4ohms with the others being around 14.5ohms. I got it home and tested each injector with a volt meter. I unplugged each injector and #2 didn't make a difference in being plugged in or not. The only time it would power up was at WOT. Would clear up and gain power as I eased off accelerator. Went down the road and noticed after about a 1/4 throttle the jeep kind of fell on it's face. Got everything installed, fired up and ran amazingly smooth. I just swapped out my injectors to some 19lb four holes.

How To Test A Injector Driver Module