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Oh my. God yeah you're important opening Z Hood Hello everybody good day to you! Welcome back! This is a Nissan Pathfinder I forgot the Year We're gonna check on that. customer states that uh is stalling and running rough and uh, misfiring things that nature. So uh, let's go ahead and get this into the shop.
Let us connect our diagnostic devices. Yeah, what do we got here? 1999 99 Pathfinder Let's get it in the shop. connect our scan tools, see if we have trouble codes. We'll take a look at the engine, see what's going on here.
Rough start too. 272 1075 miles on the clock. Yeah, we're getting up there with this thing. Pretty clean though.
Nice. There it is. There's that old money light. yeah it feels rough like even just right here in the parking lot.
Moving on in around the corner of death, our steering pump I was hard over on the on the steering wheel. That was belt slippage. good. Nuzzle you in right about here.
I'd say that's good. Parking is the auto and popping's your hood. All right. Let's see what we got going on here.
Okay, we're looking like a 3.3 liter. V6 Here someone has put uh, looks like spark plug wires. a cap wraps a whole distributor that looks kind of new. Yeah this distributor has been replaced.
It looks like okay I wonder what is wrong I wonder what it could be All right? Scan tool coming in. Let's take a look at our trouble codes. let's see what's going on here. Oh scan tool powering on.
Beep right there. Okay, all right, we're going into scanner. We're finding Nissan dots and where are you? Dotson there we are. Automatic I think this is too old for Auto ID Waiting waiting.
It's not gonna do it. Canceling waiting on canceling. Okay, we're in. Had to manually input.
uh. automatic transmission with air conditioning. Use the Nissan adapter key I don't have any Sun adapter cable. We're just going to skip that.
The I hope that doesn't turn into a hindering Factor What? No communication. That's not good. We don't want that here. We uh, went ahead and backed out a Nissan specific and I went into a global OBD Let's see if I can talk to it like that.
Come on. Okay, it has detected one. ECU Continue Continue with global protocol. Please continue.
Okay, we want to display trouble codes. Let's go into that. Okay, here we go. We've got a P300 random slash multiple cylinder misfire detected That's fairly generic.
It's just saying that we found a misfire. Then we've got a P0174 fuel trim system lean. Bank Two: we are lean. Oh, next challenge, we got codes.
Can we get data I Want to see some live data? Fingers crossed. Give us data please. Still collecting. Oh oh, we've got some live data.
This is good. Now there's our mass airflow. 5.97 grams per second. That's okay.
Pressures There we go. Here's the fuel trim action. Short terms: Doesn't tell me which bank it is yet? Long term: I'm assuming that's bank one and then down here is Bank two. So we've got positive 20 Short Terms on Bank Two: Yeah, there it is. Field Trim Bank Two and we have negatives on Bank one. So one says one thing, the other says another thing. What is going on here? Check some O2 voltages. Let's make sure these are switching.
Okay, here's our O2 Bank One Let's give it some throttle. Here we're looking at our top graph. What we want to see is this thing: switching high low high low high low. It looks like Bank One is not what is Uh Bank two.
Doing it is sensing the oxygen levels uh in the exhaust stream and the ECM is constantly trying to uh manage the fuel Curves in order to reach an optimal air fuel ratio. So you know we see this one's not doing anything either. It's not switching I Wonder if I can reset fuel trims? Let's just see if I can reset fuel trims? Those O2 sensors should just start doing what uh, what they would do normally and we could monitor them at that point to see if one of them is hanging up The most clear data. blah blah blah Well, we know what the codes are.
We know what the symptom is. We know that fuel trims are rich on one side. lean on another side. So I'm going to go ahead and clear everything out and we're going to go back and revisit.
the O2 sensor data Okie Dokes All the diagnostic data has been cleared. That should mean that field trims have been cleared. Let's go back and display that data one more time. You know your car is well loved when it's spotless at 300 000 miles and 25 years old and it's got a thumb Notch worn into it.
Let's find those O2 sensors one more time. See how short tent, short trim short term that's reset to zero. All this fuel Trends are nearing zero. So let's watch those oxygen sensors.
There's Bank One There's Bank two. Let's see which one of them is not happy. Let's go into graph. We're going to do a two graph and we want to do O2 sensor Bank two: The Bank 102 sensor is still not switching very well.
That's I Don't like what we're doing here because we shouldn't have it stepping up and down. We should just be going up and down. up and down. Scroll down to this one that Sensor 2 on bank one.
This one's monitoring the cat converter. This one's not really switching either I wonder if I can unplug these? Let's see what fuel trims do. Okay, here we go: I Switched this to a two graph and I just selected the Bank One Sensor One voltage and Bank two Sensor One voltage. These are the pre-cat O2 sensors.
These are the ones that the ECM uses to determine how much fuel to give each Bank of cylinders. So you've got bank one which is like cylinder one, three, five, and Bank two which is going to be like two, four, and six. Looks like our O2 sensor are Upstream Bank 2 Sensor one just died on us. The Bank 1 sensor.
it is switching. It's kind of sloppy. This may be a result of the fuel trims being completely 180 opposite directions because one side's running rich and one side's running lean so this may be affected by that. But it does look like our our O2 sensor on bank 2 has died out. So we've got Bank two sensor one. Again, that's pre-cat no volts. It seems to be dead, so that doesn't mean the sensor died. It may have a power supply or some other issue.
Let's go ahead and pull up some service data and uh, maybe we can take a look at what supplies power to that Upstream O2 sensor. Okay, we can even see it here on the pit list. zero volts. So it's just gone in a closed loop and now all of a sudden fuel trims are getting.
uh, they're going into the negative here on Bank One. But we're also in the positive here on Bank two 25 and negative 25. So these things are running opposite of each other. See if uh voltage came back for that? Uh, Bank two Upstream could have zero volts.
Okay, I'm looking at the service data and I've got the diagram for both of the front oxygen sensors pulled up. We've got left front and right front right here and I'm reluctant to believe it's a power supply issue because they also share power at this 25 amp fuse right here coming out of the fuse block. So they share a power fuse which is going to be bear with me here. Let's unhighlight this.
this right here is power supply to both O2s. So I don't believe we have a power supply issue because the Bank 1 sensor is operating. We've got com lines to our ECM on bank one and Bank two and then we have our grounding circuit. That's this one here.
I Think this is grounding. Okay, that goes to uh oh that passes through the firewall at a grommet. I Think that's just all grounds. Yeah, these are these look like grounds NCAA love to read into that I don't know what NCA is I'm assuming those are grounds.
Hmm, Okay, well we know which one we're focusing on that's going to be Bank two Upstream we're still not getting voltage Let's Uh, let's go ahead and identify that uh, that sensor and uh, take a look at it and see what's going on. Okay, according to this graphic, if this is the front of the engine cylinders one, three, and five, that is the passenger side of the vehicle that's going to be bank one, cylinder, two, four, six, That's the driver's side of the vehicle That's going to be Bank two and it looks like Bank Two Sensor: One pre-cat on the exhaust is our affected sensor. Let's go ahead and visually inspect it, and if it's easy enough, we'll pull it out and take a look at the sensing device inside of it. So let us power this thing down.
Look at here. now. there's voltage on the circuit. See that.
Hang on. restarting. No communication, blah blah yeah. Go back to where you were all right.
I Did see a little bit of voltage on that circuit. It did switch a little bit. Let's go ahead and pull it out and take a look at it. three. Powering down, there's more voltage engine off than there is engine on. Look at that now. unfortunately for me, the Bank 2 Upstream is the sensor that is under the intake. Here we can.
We can see it way down yonder, kind of far away. if someone replaced that before. It looks kind of newish-ish Yeah, that is newish. Ish I Can see the white on the sensor.
Hmm, it runs up and over. Looks like it connects over. here. There's our connector.
Okay, okay, here's the connector for the Bank two. This right here is connected for Bank One Uh, I Think those are the correct ones. Let me retrace these one more time. Well, seeing as how this thing has one, two, three, four new sensors on it that makes this horse a different color, doesn't it? This is our Bank one.
I'm sorry Bank two Upstream Right here. These connectors look okay. that was the clip on that's broken but I don't think that's it because it was fully seated. This one right here.
this is, uh, the Bank One Upstream I wonder I wonder I wonder I'm gonna flip-flop these connectors. Is this gonna work? Yeah, as it is. See what? I've just done there I Just flip-flopped the connectors. So now the Bank One sensor is connected to the Bank 2 side of the harness.
The Bank 2 sensor is connected to the bank one side of the harness. Let's go revisit data and uh, see if this suspected faulty sensor shows up on the bank one side, we should see no voltage occurring. Basically what this is going to confirm or deny is if that sensor that's already there is faulty or not. it makes no difference to me whether it's new or it's not new.
We're just going through the process of diagnosing right now and seeing as how the swapping connectors was actually fairly easy I Just went ahead and did that. We'll call it a time saving strategy. Okay, data's back up. We're scrolling down we're looking for let's find Bank One Sensor One and Bank two Sensor One that's Bank One Sensor One Look, it's switched sides.
Oh, there's some voltage. We got voltage. again. Well look what we have here.
We are getting voltages on Bank One Sensor One and Bank Two Sensor One: There's voltage. There's voltage I Wonder if there was a poor connection at the actual connectors? Let's go switching back real quick and make sure we got a good, solid connection. That may be all that is. Uh, what's wrong with this car? Go inside the cabin.
We'll reset everything one more time. So this is the bank two side that's plugged in where it's supposed to be I Had it disconnected. the bank One side is now plugged in again where it's supposed to be. I'm almost starting to think there was a bad connection right here.
Let's go see what the data tells us now and again. Look at that. Bank Two Sensor one is still hovering around zero volts. You can't see it highlighted.
I Think two Sensor one is not working when it's plugged into where it's supposed to be. Let's go ahead and unplug the Bank One sensor and we should see that fall to near zero. I Know this is a lot of back and forth, but since these things are so easy to reach Bank One disconnected. so we should see zero volts or mirror zero volts on that PIN Is this? Hang on? Maybe there's a huge delay in the day to give it a second. This thing was talking slow. Let's give it just a second. So I've still got bank one and Bank two sensors switched. they're plugged in and now they both seem to be online and fuel trims are coming back into play again.
I'm starting to just think that uh, we had a bad connection at that bank two sensor and it was dropping out and causing the thing to uh to go lean on on Bank two This is. this is a little odd. It doesn't uh, doesn't seem to make any sense I'm gonna go ahead and just switch those back to where they're supposed to be and then we're going to reset everything again and I'm going to remoditor it seem to be working now. it's like, like, sir, wasn't working earlier Dan Functioning wants to plug it into the connector for the other sensor.
So now that we've determined that the sensor, which is new, is capable of functioning, let's plug it back into where it goes. and uh, maybe we can just rule this out as a poor connection right here somewhere and we can take a look at those pins a little bit deeper. So let's head back into the cabin, revisit our data, and see if our fuel trims are stable or not. What do we got here and that's uh, what do we got? I Saw a negative number somewhere.
a big one, like negative 20 something. It's gone now here. I'm just gonna give this some some throttle and we'll hold it for a little while and we'll see what these, uh, short-term and long-term feel trims do. There we go.
Short term Bank Two went through the roof tank one. We're going negative again. What's going on here? Well, son of a biscuit I'm I'm getting frustrated here because I've got these two. Uh, I've got the two Upstream O2 sensors connected backwards.
So I've got the left side on the right side connector and the right side of the left side connector. I Cleared the fuel trims and now everything is operating exactly like it's supposed to be. Fuel trims are near zero. Look 1.6 for short term on Bank Two Negative: 1.4 for a short term on bank one.
Like that's that's all right where it should be. It's hovering right around zero and long terms are not trending I Don't understand because I I Plug these in backwards and everything is working like like it's supposed to be. What if? What if they were mixed up when they were replaced? I'm I wonder I really wonder I wonder if it just came in and we had the connectors flip flop from the get-go when those O2 sensors got to play got replaced originally because this is all exactly where it should be. But I Know that I crisscrossed those connectors. These guys. This one was found right here and this one was found right here. but it seems to be quite possible to get the actual sensor connectors out of our way. A sensor connector goes there.
Let's get this one out of here. We can readdress that later. Yeah, here, let me shut this down. I I'm suspecting that all this stuff was, uh, somehow got crisscrossed my accident at one point.
Let's let's start over and uh, pretend I'm where where this was at one other point. So I've got everything disconnected. Let's say we just changed all the sensors. Here's our wiring harness.
I Found these two connectors connected here. These two connectors connected down there, right? You found a clue. Let's go with what we know. What we know is this: this thing right here is going to be critical.
We know that this goes right in here. See that now. these can't go over here because now there's not enough reach even if we route this on this side because they don't reach. So I think that these go here in here and I think that these two the longer ones go over here.
That's what I'm starting to think here. so let's wire this up as if this connector is going to go here on this side. Is that going to work? Yep, click q1 and then this one which is the downstream for Bank two. Let's say that one goes on this side, but we're not even going to connect that just yet.
Let's just connect the upstreams. So this looks like a downstream and this is our Upstream connect those and we'll go ahead and clip that on to the little bracket here. I Choose this one. Please go on to the little bracket.
There we go And then our Upstream sensor on bank 2, which is over there. We'll connect that one to the bracket as well. Do not make a liar out of me. Okay, so the only thing left unconnected is our Catalyst monitoring O2 sensors.
Those are the downstreams. We can deal with those later. Let's go back and restart this and to verify our data. Yeah, I'm starting to think this thing came in with the wires backwards.
Okay. Engine running again. Short-term Bank Two Field trim is looking good. Short-term Bank One Fuel Trim That one's still looking good.
They're hovering around zero. so let's see what the sensors are doing. Bank one has some voltage. Bank Two Yes, where's Bank Two Bank Two has some voltage.
Okay, I'm gonna run this for a moment at high idle and we're just gonna see what those fuel trims do. Short-term Bank One is switching high, low, high low. We're seeing a little bit of negative. A little bit of positive.
Same thing with Bank two. A little bit of negative. A little bit of positive. Long-term Bank One is steady 8.6 4.7 on Bank two.
Anything within the plus or minus 10 is of no consequence fake One Sensor has voltage that's switching Bank two sensor has voltage that is switching and Sensor 2 and Sensor 2 are both open circuits that are defaulting at 0.3 volts to make sure that these are on the correct side. So let's go ahead and unplug Bank one. We know what Bank One is. that's the passenger side. Let's disconnect the Bank One sensor real quick and we should see that voltage drop Bank One Upstream Disconnected Now let's head back into the cabin, raise the idol again and we'll see that Bank One does not have any activity. Okay, O2 Sensor Bank one Volt: 0.3 That's what we've already determined to be our open circuit voltage that reads on the PID and then Bank two. Sensor One: We're still switching here. We're going high, low, high, low.
so that's a confirmed fix. It was disconnected or it was connected on the wrong sides. We have the harness side connectors in the wrong position. This connector was over here.
This connector is over here and the harness was rerouted this way so it would reach and we failed to plug in. What we know which is that little wiring harness securing, zip tie thing. Firm fix. No parts needed.
Now all we need to do is determine which of these connectors is for the uh, the downstream O2 sensors. I Believe it's self-explanatory but you never know. So let's plug in the bank 2 Downstream and then we'll confirm that it has activity scan tool. If if we have activity on the bank one side then then we know that this one is also switch.
How does this go? It goes like this: fairly certain that's in the right spot. so I'm just going to put it on a bracket I Don't know if I said bang two but this is the Bank One Sensor two that's Post Cap So let's see. look for activity on Bank One Sensor two O2 Voltage Bank One Sensor two point seven volts and O2 sensor bank 2 Sensor 2 which is still disconnected 0.3 volts. We're getting somewhere now.
this is this is confirmed fixed I think we got it. let's plug in this other side and then secure that wire and I believe that's off the road. so if you in right here and then we'll secure that back down on its little uh little clip thing. do I cannot see.
ah there's a flashlight. Come on guy. get on there. Oh man, my guy's gonna be so thrilled to find out he doesn't have to spend any money.
I mean he's gonna spend some money but we're not. Uh, we're not buying parts, No parts. Cannon Okay, these are connected where they're supposed to be. Let's go recheck our data just to confirm everything.
This is awesome and look at that. Okay, let's graph it. Yeah, all four of these. they're all four switching high Low high low.
Let's take a look at our four bar graph O2 Sensor voltage. Look at that. These are our down streams. These are our Upstreams right here.
Everybody's switching like they're supposed to. We you were getting into a negative feedback loop where it was sending a signal or it was getting information saying this site is Rich and this side is lean so it added Fuel and took away Fuel And then what it said is this side is even more rich and this side is even more lean. So it added Fuel and took away fuel until both fuel trims were maxed out on either side. Then the ECM couldn't try to compensate anymore and that's where we got into the running rough condition. But the graph is Beautiful Everything is doing what it's supposed to be doing. That is. Uh, that's that. Like, we got a confirm fix here.
There's no parts necessary. Uh, simple error in installation things happen. Oh I Need to go back in. Let's go ahead and clear those codes one more time just in case any have been set.
Okay, we're not going to need any more under hood lumens. So uh, let me get this thing out of here and then we're gonna go out, hit the road and go on a quick test drive. 3.3 liter. All right.
Well, this scanner is clearing all of the uh, all the information and doing one more reset. We're gonna go ahead and back this thing out and go for a quick test drive. Make sure all of our numbers say whether or stay where they're supposed to stay and get pretty close right there. All right, hitting the road here.
it's feeling pretty smooth. Yeah, it's got a good Power Band There's no stalling, there's no sputtering, there's no misfires. Problem solved. It was a simple installation error.
The computer got all flippy floppy, didn't know what to do, it was getting incorrect signals from the incorrect side, and the actions it was trying to taking was the uh, the opposite of what it was trying to achieve. Still, glancing down at the scan tool on occasion, and our fuel trims are right in line. Long terms and short terms, everybody's hanging out and hovering near zero. This is a hundred percent win.
Super pleased with the results here. So uh, that being said, I'm gonna go ahead and oh my God yeah, you're important. Let me go ahead and close this video out right now. and I will do so by thanking each and every one of you for watching the city right here.
Uh, not that one. I was talking about me? No, just kidding. I'm not that self-deprecating Uh, but I would like to thank you again for watching this video. As always, hope you enjoyed this video.
If uh, you did, in fact, enjoy this video. Please feel free to let me know about that in the comment section down below. Let me know if you ever encountered something like this while trying to diagnose a problem. Or let Me know if you actually cause something like this while trying to repair a problem.
That should be a fun comment thread. So again and as always, thank you for watching and most importantly, do not forget to have yourselves a great day! See you guys later in! Nissan Datsun Okey dokey! Back at the shop, we just backed into a parking space, revisiting our fuel trims one more time. Long terms are hovering at zero. Short terms are doing what they should be. No check engine light, no problem with the sensors, We're good to go. Car is parked powering down. Re-ending of: Pathfinder See you guys later.
Good detective work again.👍
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.
Glad u figured it out !!!
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
Good job mate!
you didnt connect em wrong when they replaced the sensor they mismatched plugs bro
Hv you been watching Ivan?
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.
Liked your straight into the project, without the intro better. But don't object.
See a union brothers' sticker on the windshield.
when you had the wiring diagram, why you not check the color codes for the signal wires in the harness?
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?
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!
Looks like your keeping plenty work Ray. Good for you especially vas a startup repair shop
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.
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.
This is why different components should have individually styled plugs/receptacles.
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…
Nice catch Ray
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.
Definitely time for a better Scan tool Ray👍
my one upstream sensor reading wont go over .400 but its moving up n down, any idea. other fluctuates bw 0.00 to .900
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.
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
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!! 🤣
thats wild and awesome ray lol make an ecm go to war on itself by swapping the wires because of a previous dudes change
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!
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.
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
glad to see your busy, I wonder how long before you have to hire help.
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!
I had same issues with a Kia v6….
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.
You know the o2 power doesnt effect the signal right? Just the heater?
Ar end of video .. typical Sony head unit
Great work at diagnosis of the issue
hmmm vids are way better now…more info on whats, & whys is a huge plus..resubscribing
Who Da think it. I know I wouldn't have.
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!".
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!
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
Excellent! 👍😁
Wondering if the "PT" stands for "patience tester." Way to be patient Ray, great job!
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!
It's like riding a bike with your arms crossed and left hand on right handlebar and vice-versa. very hard to do!
Electronic Diagnosis Mantra: It's Always The Connector….Unless there is software involved.
Ray has an addictive personally. I can't wait to get home from my work to watch Ray work. Should I seek help? HAHAHA!
Any one else catch the white Chevy truck didn't have any brake lights? I think he needs a little Rainman magic sprinkled on it.
I wonder if the fact that the drivers side is bank 2 and not bank 1 like most vehicles threw the other guy off and he connected them backwards….
This kind of video makes me think I'm watching Eric O 🤣
At least this nissan doesn't have that junk jacco transmission in it!
I can tell by the sound of your voice that this application of logic and the scan tool live data fixed the issue without parts!
It also confirms that being particular about putting where the engineers designed them to be routed is IMPORTANT!
Hey Ray you are the men!!
Greetings from Colombia South America!!
I love your videos, and I think this is the first Pathfinder in videos since I started watching you sin February 2022!! And I say so because I own o e of those, and can tell you those are the best Nissan ever made
Been there before.😖 I call that the old "Repair the Repair". Some times the "Repair the Repair" becomes the "Repair the Repair and then the Repair". Keep on Keep-in on brother, love your YouTuben.👍🏽
WOW, Ray! Awesome diagnosis!
Where are your paper floor protectors?
Hi Ray, I love your videos and just wanted to tell you I lived 10 miles away from the Longines watches factory :p
Take good care !
This was a very good job in diagnostics. Your shop doesn't have room for a parts cannon. Good work.
Good job Ray.
I have messed up wires on a previous vehicle I was doing a spark, plug change and messed up two wires and that was it I knew better not to pull all of them out. I did pull one of them out at a time I just blanked on two of them.
It wasn't o2 sensors (i don't have a scan tool to even test such a thing), but trailer wiring…I've chased so many bad grounds that can cause all sorts of weird things to happen.. These days i just default to a all new wiring harness as soon as i have just about any issue with trailer lights. Spending hours chasing down grounds just isn't worth the 20$ worth of wire and 30-60 minutes to just go all new.
I also NEVER use chassis ground on trailers (if your ground wire fails, you can get intermittent ground through the tow ball.)
That engine looks all too familiar…. lmao. Mine doesn't have the EGR system though. I had issues with my own O2 sensors, which was really frustrating me. Discovered that O2 codes went away when the alternator went out and ran off the battery for a couple of days, of all weird things. Ran a new alternator charging wire and haven't had issues with them since.
Fun facts about this engine:
There is, interestingly enough, a service bulletin that exists for some of those 3.3s (maybe it was the 3.0? they use a lot of similar components) in certain environments to run a new ground wire from one side of the engine to the other to fix grounding issues.
Back connectors on the valve cover are bank 1, front connectors are bank 2.
Both upstream and downstream are wideband sensors.
The engine only uses the Camshaft sensor for ignition timing (which is built into the dizzy).
The bearings in the dizzy are known for going bad, and as the engine warms up, it'll cause the engine to run rougher and rougher, ultimately stalling until it cools down. Unit is not intended to be serviceable, but be fully replaced.
The crankshaft sensor is not keyed, it's only used to detect misfires.
One overheat may warp the heads, have fun with that. Block is iron, heads are aluminum.
ASCD is Nissan's term for the cruise control module (Automatic Speed Control Device).
As Electronic Engineer who knows squat about cars in general, I was watching you do the initial swap of sensor connections and going – 'I know what is wrong'. But could not see how the vehicle manufacturer made this so easy to get wrong (ability to swap). Seems like you caught on in a logical fashion and sorted it. VERY impressed Ray.
And really like your knew neon-sign-on. Very cool.
In my younger years I would purchase any vehicle that was a good deal and needed abit of work to flip, out of all the check engine lights I saw and was told it was an O2 sensor.. I think this is the first vehicle I’ve seen where that was the issue 😂
Suzuki Motorcycles have a Secondary Throttle Valve Actuator (STVA) to provide low speed torque. It has a gray and a black connector inches away from each other but the connector shape and pin outs are the same. VERY common failure is to cross them up and get ERROR codes and no run.
I'm remembering when I was a kid, back in the 80's, and the mechanic's shop had a Snap-On engine analyzer. It had a big TV screen and it showed some similar analytics. Now, Ray has a machine that does a lot more & is handheld. My how times have changed.
I had someone change the spark plug leads after I had parked a forklift to service, I changed plugs, oil,and filters and leads changing one at a time put it back couldn't work out why it wouldn't run, all the best to you and your loved ones
I had a customer with a c-10 that he had another shop put an LT-1 from a camaro in. They put the ecm on the wrong side of the engine bay so the o2 sensor wires were on the wrong sides
Great video great content great explanations as to what your doing 👍👍👍keep up the good work
You sir are definitely a master of your craft. Thank you for doing a fantastic job
I’m still here, good common sense diag. Proves the numbers never lie !
Wow that was a good one 👍like an automotive who done it. Well done. 🇦🇺
Nice fix but what is that red light in dash 8(
Can only hope to find a mechanic as honest and educated as you are someday. Until then I'll just keep driving new cars with a warranty lol
This is why I do things one at a time so there is no error when putting things back into their homes just something my dad thought me if there is something with multiples do one at a time so you don't run into problems in the near or not so near future
I was involved with an issue along these lines. Rebuilding a Ford 370 motor out of my F600 wrecker. Daryl (GM mechanic) took the engine apart and numbered the rods and caps GM style. I put things back together using Ford’s numbering. By the time I got halfway done things started getting tight. We figured it out quickly enough and no harm no foul. A year or so later he offered to help me with the trans. I told him I was happy with 4 forward gears and one reverse gear.
maybe they plugged them in backwards
This is how you build customers for life.
This reminds me of being in auto shop and the teacher would unplug sensors and cut wires and plug in things wrong, just like it was in the video
Fault finding, always for the win 🙂
Come across this sort of issue myself a few times. Always made me wonder…. Am I being tested by one of those hidden camera news shows, customers testing my honesty, or are people really capable of changing their own parts then messing up the easy part….
I'm glad you heard me saying that the connectors were probably switched 😂
And this is why, like plug wires, you do one at a time. Learned that the hard way. Great job running it down Ray !
Excellent diagnostics, using voltage and trims!
Ray, I was so impressed with your diagnostic skills. I am thrilled you opened your own shop and you and your family deserve the best! Best wishes from Ogden, UT!
Easy fix.
I would love to see the customers reaction to this stuff?
My grandfather who has passed away (we all called him grandpa don), used to love to tell me a joke about the name “Datsun” and how they came up with it
that is some dumb design, connectors not keyed to prevent mistakes, …poor build design
So you use STABILANT on connectors, on those plug types. VW dealer uses it when screwy problems, ya buy a small bottle and mix with Alcohol, just use a drop or two on contacts…
Where is the, telephone jingle ?
Ray nice video. Usually you would think the sensor plugs would different. Must be the same exact sensor
The music sounds like something from the movie "The Running man"… very retro. Good find on the O2 sensors
Rule #2: Always work on connectors you can easily reach first! Relevance to the problem is irrelevant. 😵💫
I can't count the number of time I used this method to figure out what plug goes where in a harness. When you have so many unplugged and they all look almost the same, Just connect the harness to the connection points then based on the length of the wire you can tell where the plug goes. It can't reach here so it must go here, what's in here that plugs into it? Works all the time. Manufacturers for most part avoid using the same exact plugs with the same exact lengths close together, USUALLY LOL
Keep up the good work Ray. These type of videos are why you're followed on you tube so closely. Keep em coming.🤓
At 4.30 my 2.7L Santa Fe had that. it was a clogged oil supply to one part of the cam caused by a missing head guide pin (Former owner did do something?). The cam had melted in some spots. Refurbished head on bank 2 and some reading on how use a wrench and it still runs 3 years later. Did only misfire on idle warm and i would post pics of the cam if yt would allow
Been watching for a long time. I do work on my own car and scooter as well. Story don’t trust right parts are ok vehicle all the time. Was given a free scooter. Took one year after replacing ignition coil and spark plug three times that what was in there when I had the scooter wasn’t correct. It did work good enough though. Also the person had put the wrong unrestricted drive boss on it. Now with proper drive boss and ignition coil and spark plug she starts like a beauty and goes 48mph being a 49cc. Lesson go back to specs for vehicle.
😂 How’s this new intro format working for you guys n gals?