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Kr50

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    Barnfind R50 road to rescue.

    in 96-2004 R50 Pathfinders

    Posted

    7 hours ago, Slartibartfast said:

    Looks like the fuel pump itself has white/blue and black wires. Black goes to body ground, white/blue goes through two fuel pump relays for some reason, through a 15a fuse, to the battery. EL-698 of the '02 manual has the wiring diagram. Check for power at the fuse, then at the first relay, then at the second relay, make sure both relays are clicking. If you have power to a relay, but it's not clicking, and the relay itself tests good, check for signal. Looks like Relay 2 is controlled by ignition signal (key on, relay on) and Relay 1 is switched by the ECM. If Relay 2 has no signal, I'd expect some kind of wiring fault; if relay 1 has no signal, I'd wonder if some anti-theft bollocks in the ECM might be playing up. Looks like one is switched on the positive side and the other is switched on the negative side, so keep that in mind while you're testing.

     

    You can get the EL section here. The diagram I'm looking at is on EL-698. There should be a "location of electrical units" or "harness layout" diagram somewhere in there showing the locations of the relays, ground points, and connectors. The fuse box diagram showing which fuses are which (they're numbered in the electrical diagrams, not labelled, because everyone likes an extra layer of BS in between you and the thing you're looking for) is in the foldout.

     

    The pump only needs 12v across the white/blue and black to run, so if it turns out to be a wiring issue, you could just hotwire it to get it going (or at least to test it). If the anti-theft is what's locking it out, though, you might not have spark or injector pulse either.

    I will definitely doing this procedure this weekend and let you know how it goes. Also many thanks for the diagrams. It definitely helps a electrical noob like me. If worst case it ends up being something like an ECM thats gone bad. Would another ECM just plug and play from a different car?

    Barnfind R50 road to rescue.

    in 96-2004 R50 Pathfinders

    Posted

    So made some updates today. I checked the fuel pump connector and the wore with 4 prongs gets power and the 2prong which is connected directly to the wore leading to the pump doesnt get any power. Slight change in frequency when turning the ignition on. So i checked all the relays and fuses that’s associated with the fuel pump and they seem fine. I pulled the back fuel pump relay panel( next to the amp) and found out theres only one relay. Im guessing theres 2 and one conector was just hanging. I bought another relay and connected that and still no success. What else would factor fuel pump not getting power? Is theres a common issue on pathfinder? Im kinda running out of ideas.

    Barnfind R50 road to rescue.

    in 96-2004 R50 Pathfinders

    Posted

    So finally managed to get the new starter. That was not a fun job at all lol. Now it cranks and engine seems to try to start but seems like no fuel coming in. So i pulled a hose from the filter line and turned ignition on and no fuel came out although i hear a buzzing noise when turning on ignition for about 4 seconds and goes out. I took the fuel pump cap off and kept my hand on it while my buddy turned ignition on but there was no vibration just sound from underneath thats hard to pinpoint. Does anyone have any ideas of what it could be? Any places i could check if the pump is working for sure. 
    thanks

    Barnfind R50 road to rescue.

    in 96-2004 R50 Pathfinders

    Posted

    18 hours ago, Dbot said:

    I bought mine at 206k mi and did it around 212k mi but there's been people who've had the issue with the screws falling in the intake way earlier. It's a roll of the dice. You could either be missing screws right now or you could go another 50k before dropping a screw. I'd recommend doing it when you do the IACV gasket.

    The 2001 and 2002 Pathfinders have a IACV gasket that gets brittle and eventually fails. When it fails, it drips coolant on electronics which shorts them out which has a chain reaction that shorts out the ECU. Power Valve screws won't work themselves loose sitting in a barn, but the 18 year old rubber gasket keeps aging whether it sits or drives. I would recommend buying the cheap gasket and an impact screw driver to change this first. While you're there, you have access to the power valve screws with just a few more turns of the wrench.

     

    Barnfind R50 road to rescue.

    in 96-2004 R50 Pathfinders

    Posted

    5 hours ago, PathyGig12 said:

    That’s most likely a stuck solenoid on the starter. For a temporary fix you could try tapping it. I was getting that same click-no start issue intermittently before swapping my starter but now it’s gone

     

    I will try tapping it. Starter solenoid comes with the starter as a single unit i assume. I checked on rockauto and theres a seperate drop down for it. Thanks for the reply

    Barnfind R50 road to rescue.

    in 96-2004 R50 Pathfinders

    Posted

    Hello all. I just bought a 2002 pathfinder with 167000 miles that was sitting in a barn for the last 3 years. Its pretty clean but has a starting issue im trying to diagnose. I just installed a brand new battery and tried to start it but all i hear is one click and no cranking. Im leaning towards the starter but would like to get some ideas here first. I will post some pics when i get a chance to take some proper ones.

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