UnKnownMythz

Alright here's the deal, I've been working on my jeep in my school shop for 2 weeks and I'm finally out of possibilities here. So how'd it get to the shop? here we go... I bought this jeep about 2 months ago from a family friend. The jeep has 165k on it and little rust, the interior is nice and it's been taken care of. It had been sitting at an apartment complex for a month so I decided to buy it off of her. New radiator, crankshaft pos sensor, coil packs, spark plugs and all sorts of parts. So 20 minutes after replacing the pressurized power steering line it suddenly died on me in the middle of traffic. No indication of what happened my steering got stiff as well as my brake pedal. so I tow it to my house, and then I get it towed to my school shop. From there we thought of everything possible my teacher has 30 years of experience so I thought he would get it figured out no problem, well I'm here. So far is has thrown the P1389(thing with the ASD voltage or whatever) that's all. we checked for spark, compression and fuel up to the rails. Something is telling my injectors to stay closed I believe. I replaced the PCM because following a flow chart led up to that. Even with a new PCM the thing wouldn't want to start, I hooked up an OBII scanner and it reads RPMs, my crank pos sensor and everything it normally would. I have no clue as to why this thing is not starting, I have gas up to the rail, I have fuel pressure, compression in all cylinders, spark in all cylinders everything. If any of you guys have any ideas I would greatly appreciate it. It is killing me not having a vehicle for 2 weeks and going. It cranks but no start. It keeps blowing my injector fuse in the fuse box on the passenger side of my engine bay, after printing off some diagrams I have found that the dark green/light green wire that powers my injector has a short somewhere, does anyone know any common locations of a short? I have been tearing apart the wiring harness trying to see where it keeps going but I'm not making any progress.

dave1123

Okay, the injectors are all supplied with power when the ASD relay energizes and the computer grounds them to make them squirt fuel. All those wires run thru the harness that passes behind the head. I suspect that the common power wire is shorted somewhere in that harness or at an injector. The fuse is blowing and the PCM isn't seeing a signal. It's possible the relay itself is shorted or there's corrosion under the fuse/relay box.

The ASD relay controls both the ignition and injector circuits. It doesn't get energized until the PCM receives a signal from the crank sensor. The fuel pump relay is energized the same way except for the initial pulse to pressurize the fuel rail at initial key turn on.

P1389 - No ASD Relay Output Voltage At PCM.

UnKnownMythz

Hey thank you for your response. after doing some digging for a couple hours it was found that the wire for my injector fuse was shorted out. After splicing, butt connecting, heat shrinking and electrical taping the heck out of the wire it fired up just fine. After leaving the shop my check gauges light was on and so was my check engine light (i think i forgot to clear the codes, its in a limp mode sort of state) so I pulled into NAPA and did a battery test, bought a new battery and my Jeep is still in that limp mode state. it revs past 2,000 rpms but driving it wont go above 2,000 RPMs do you have any ideas for that? it idles fine, but it just doesn't have the power it used to. I was thinking it might be because I didn't clear my codes but I still think I should have power.

dave1123

BTW, I just had an amazing discovery. Liquid Electrical Tape! I looks just like Flexseal and paints on with a brush in the bottle. Real nice for sealing the ends of shrink tubing or insulated butt splices.