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Wrong data! ecm is killing it! nissan pathfinder 3.3l datsun? – Auto Repair Chat

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99 thoughts on “Wrong data! ecm is killing it! nissan pathfinder 3.3l datsun?”
  1. Avataaar/Circle Created with python_avatars Richard Gordon says:

    Good detective work again.👍

  2. Avataaar/Circle Created with python_avatars Medkow74 says:

    Did this to my A/C unit. I changed a gas valve in my furnace out and put everything back together, furnace works great again, then comes summer. After a week or two it just doesn't seem the A/C is working quit right. Here because my UV light in my furnace discolored the the 24v wires on the PCB I switched the 1st and 2nd stage wiring for the compressors in the A/C unit. The board outside was so confused.

  3. Avataaar/Circle Created with python_avatars Adrienne Fraschetta says:

    Glad u figured it out !!!

  4. Avataaar/Circle Created with python_avatars James says:

    great video as always. as soon as it showed rich on one bank and lean on the other i suspected the sensors were switched between banks causing a feedback loop.
    given that both sensors plug up at a similar location, it looks like a pretty easy error to make, especially if one isn't tagging the plugs or replacing/reconnecting the sensors one at a time so mistakes like this cannot happen

  5. Avataaar/Circle Created with python_avatars James Reardon says:

    Good job mate!

  6. Avataaar/Circle Created with python_avatars Damion Richter says:

    you didnt connect em wrong when they replaced the sensor they mismatched plugs bro

  7. Avataaar/Circle Created with python_avatars wisemjk says:

    Hv you been watching Ivan?

  8. Avataaar/Circle Created with python_avatars Just Me says:

    I'll share a story, similar to this one but I'm an electrician and it was in my trade. Went to a customer on a fault complaint that the underfloor heating in the shower was getting really hot even tho they had the thermostat set to low. Well I didn't diagnose it at first because my work order just stated that I should replace the floor thermostat. The thermostat has a sensing bulb that goes in a tube that goes into the floor between the heating element, so it switches the floor heating on and off according to the actual temperature of the floor, not just the room.

    Well a few days later I get a recall and still doesn't work. I start to dig into it a bit more. There are two thermostats side by side, one for the shower floor and one for the sauna floor. I talk to the customer. They have recently had some carpentry work done and they moved the wall that has the thermostats about 20cm. It is a timber wall. After some measuring and stuff I came to the conclusion that the carpenter had mixed up the sensing bulb tubes. So the shower thermostat was sensing the sauna floor and vice versa. So when the sauna floor was cold, it turned on the shower floor heating. That of course made the sauna sensing bulb hot (because it was in the shower floor tube) and therefore did not turn on the sauna floor heating leaving the shower floor sensing bulb cold.

    Long story short: electric floor heating, two thermostats with floor sensing bulbs that got mixed up.

  9. Avataaar/Circle Created with python_avatars Toto555 says:

    Liked your straight into the project, without the intro better. But don't object.

  10. Avataaar/Circle Created with python_avatars Jason Hodges says:

    See a union brothers' sticker on the windshield.

  11. Avataaar/Circle Created with python_avatars alan dawson says:

    when you had the wiring diagram, why you not check the color codes for the signal wires in the harness?

  12. Avataaar/Circle Created with python_avatars Lewingjr says:

    Instead of the guess and by golly shouldn’t you have just looked at the wire colors on the harness against the wiring diagram you had up?

  13. Avataaar/Circle Created with python_avatars Oscar Bravo says:

    Looks like you're off the ground, sir. As always, the content is top-notch and full of great objective reasoning and critical thinking. Can you imagine if the customer had gone somewhere else? Two barrels of partshot!

  14. Avataaar/Circle Created with python_avatars woodwerkman1 says:

    Looks like your keeping plenty work Ray. Good for you especially vas a startup repair shop

  15. Avataaar/Circle Created with python_avatars 3Dilettante says:

    is there a fix for that belt squeak on the power steering pump? I got stuck in a sandstorm with my '01 taco and its made that same noise (when i crank the weel) ever since.

  16. Avataaar/Circle Created with python_avatars Patrick Sewell says:

    Had a fun experience similar to this with my 04 grand caravan 3.8 when a shop replaced my upstream and downstream 02s and then a P0430 came out 0f nowhere, but looking at live data, the sensor data was not coming through at all and the shop then wanted me to buy a brand new ECU and reflash it. I did my own research and found out the craziest thing. The auto parts stores sell a Bosch brand "compatible" interchangeable O2 sensor which happens to plug in using the factory writing harness and screws right in no issue… Shop actually agreed to replace the Bosch O2 sensors with exact replacement Bosch O2 sensors in case the new ones that were previously purchased were faulty from the factory, however the issue persisted. I still did more research and found the craziest thing. Apparently these Bosch sensors only send data to the ECU using a negative ground signal whereas the factory O2 sensors used a positive voltage signal to send and read ground data on the same wire. Replacing with any other brand of O2 sensor immediately fixed the issues with the check engine trouble code and the rough running issues. The shop was in disbelief, lol. The only way I found it was watching a random YouTube video that a shop did with the same 3.8 l that was in a Dodge charger or something like that and it had the exact same issue and replacing that Bosch O2 sensor was the fix… Good lesson here is that even if a shop sells you a compatible part and it plugs in and screws in doesn't mean it is still compatible, lol. I actually had to pull up the spec sheets on that exact model Bosch sensor to determine how the data was sent and then of course researched the data connection on my caravan side and that's how I knew immediately that that would cause an issue. Craziest fix I've ever seen in a long time.

  17. Avataaar/Circle Created with python_avatars Aaron Gurtler says:

    This is why different components should have individually styled plugs/receptacles.

  18. Avataaar/Circle Created with python_avatars Krisemann says:

    Installed an O2 sensor on a Volvo 850 a few years back (the old one gave in at 200k miles), and the car would run lean and die. Could not figure out what was going on. Took it to a shop, who could not figure out what was going on either. Finally the dealer looked into it and found out the O2 sensor was the wrong type and was for the 20 valve 5 cyl engines, not the 10 valve engines. I have not had O2 issues on my current car (Audi A8) yet…

  19. Avataaar/Circle Created with python_avatars Thomas Lockard says:

    Nice catch Ray

  20. Avataaar/Circle Created with python_avatars Blade says:

    I was watching you doing the diagnostic on the car, and I was just getting ready to type in the comments, "I wonder if the connectors are backwards", and 5 seconds later you mentioned that they might be backwards. that was awesome.

  21. Avataaar/Circle Created with python_avatars Shooter Ace says:

    Definitely time for a better Scan tool Ray👍

  22. Avataaar/Circle Created with python_avatars w.k k says:

    my one upstream sensor reading wont go over .400 but its moving up n down, any idea. other fluctuates bw 0.00 to .900

  23. Avataaar/Circle Created with python_avatars vilefly says:

    Only 2 things cause fuel trim to skew in opposite directions: 1) timing chain jumped a tooth/VVT cam gear bad 2) swapped o2 sensors. The swapped o2 sensors have a milder symptom compared to the other, and therefore are tricksey and false, just like nasty hobbitses.

  24. Avataaar/Circle Created with python_avatars adam norwood vlogs says:

    This video reminded me of when I had a transmission shop rebuild my transmission in my 2001 Tahoe and they had the electrical connectors swapped so it wouldn’t shift out of 2 gear and they couldn’t figure it out so I picked up and took it to the Chevy dealership and pluged the connectors in the right places

  25. Avataaar/Circle Created with python_avatars five0pd310 says:

    I was finally able to guess the correct diagnosis before Ray let us in on it! I feel like I've now accomplished everything in my life I've needed to!! 🤣

  26. Avataaar/Circle Created with python_avatars Zundfolge1432 says:

    thats wild and awesome ray lol make an ecm go to war on itself by swapping the wires because of a previous dudes change

  27. Avataaar/Circle Created with python_avatars Keith Standiford says:

    Love it! I was screaming at the screen when you first swapped them: "They're swapped, unplug one!" But I didn't have to wait long!

  28. Avataaar/Circle Created with python_avatars Damien Villano says:

    I did something similar to myself. Replaced an oxygen sensor and reset the codes. Only to have the same code come back shortly after that. I replaced the wrong one lol. Fortunately I hadn't thrown it away so it was an easy fix.

  29. Avataaar/Circle Created with python_avatars rick englund says:

    I was watching the Wolverines and Buckeyes highlights and your video was beside on my YouTube feed. You were more entertaining. I’m glad you have many more videos

  30. Avataaar/Circle Created with python_avatars Hawkertech says:

    glad to see your busy, I wonder how long before you have to hire help.

  31. Avataaar/Circle Created with python_avatars Me Z says:

    Ray, you should really put in an exhaust system for when you leave the cars idling. My job's auto shop has this system where they attach a giant flexible hose to the exhaust pipe and it sucks the exhaust up and out the roof. Gotta look out for the wife unit and little ones!

  32. Avataaar/Circle Created with python_avatars Manny Velez says:

    I had same issues with a Kia v6….

  33. Avataaar/Circle Created with python_avatars Andrew Roman says:

    Aside from guessing which connector goes where, you can jump the supply and return pins of the connectors and set a high voltage fault that should read something like "bank 1 sensor 1 shorted to high source" so you know exactly what sensor goes to which connector

    Also another reason to replace one sensor at a time so you don't mix up the connectors.

  34. Avataaar/Circle Created with python_avatars Mark Rix says:

    You know the o2 power doesnt effect the signal right? Just the heater?

  35. Avataaar/Circle Created with python_avatars ᗒᗕ MIKE HUNT ᗒᗕ says:

    Ar end of video .. typical Sony head unit

  36. Avataaar/Circle Created with python_avatars ᗒᗕ MIKE HUNT ᗒᗕ says:

    Great work at diagnosis of the issue

  37. Avataaar/Circle Created with python_avatars Aamber says:

    hmmm vids are way better now…more info on whats, & whys is a huge plus..resubscribing

  38. Avataaar/Circle Created with python_avatars CombatKarl says:

    Who Da think it. I know I wouldn't have.

  39. Avataaar/Circle Created with python_avatars JoeVK says:

    I once did a tune up on a '92 Grand Prix 3.1 and hooked all the plug wires up wrong. I ripped all the plug wires off all at once like the big dummy I sometimes am, and when putting the new wires on, guessed that the front bank was bank 1, and the rear bank was bank 2. Nope. Exact opposite. The engine would try to start, but would kick backwards and die. Grabbed my handy dandy Haynes manual (no internet back then), looked up the firing order, and immediately did the Homer Simpson "DOH!".

  40. Avataaar/Circle Created with python_avatars Roger D says:

    That is a major design error of Nisson! They should have had the brains to KEY THOSE SENSOR CONNECTORS so they COULD NOT be MIXED UP!

  41. Avataaar/Circle Created with python_avatars Roger D says:

    On that Nisson Pathfinder with the suspected swapped connectors. If you closely examine the schematic diagram, you may find that the wire color code will guide you as to which sensor is connected to what output connector. Examople…. the red, black, white wire on pin 2, matches up with the red, black, white pin 2 of the sensor connector

  42. Avataaar/Circle Created with python_avatars Valve Geek says:

    Excellent! 👍😁

  43. Avataaar/Circle Created with python_avatars Jeffrey Evens says:

    Wondering if the "PT" stands for "patience tester." Way to be patient Ray, great job!

  44. Avataaar/Circle Created with python_avatars cheeseburgerbeefcake says:

    That panasonic stereo sound is a blast from the past! Daaaayum. The only thing your guy will be a bit grumpy about is the previous guy not doing it right and asking for your time to at least in part be paid for by the guy who dun did it wrong; but nice diagnosis! Using cable routes to eliminate the doh is 10/10!

  45. Avataaar/Circle Created with python_avatars Joe Schmohe from Simcoe says:

    It's like riding a bike with your arms crossed and left hand on right handlebar and vice-versa. very hard to do!

  46. Avataaar/Circle Created with python_avatars Cliff Cordes says:

    Electronic Diagnosis Mantra: It's Always The Connector….Unless there is software involved.