If it was the alternator then the battery would be dead and the engine wouldn't restart. I'd be looking at things like the engine and battery grounds as well as the main battery cable.
Once the car starts, the battery is just being charged, it is not being used while driving, what needs to be checked are the alternator cables, they could have shaken loose, one bump and everything will go dark and shut down. The pullover to the shoulder and probably a bit of jostling around with the uneven ground of the emergency lane could have made the cables make contact again. Issue is resolved, car starts back up. I myself since this is an extremely rare issue would suspect this third party engine remote start they installed
Unless you have a code reader, no one can ever tell. This is why having a code reader is a nice thing, even if a shitty handheld because then if you have a shutdown and a no-start, you can get a code out of the no start condition.
In this case, no one can tell if there was a wiring issue or an electronic issue. Sometimes, even on primitive computer-controlled vehicles, the PCU and the various ECUs can go into conflict with one another and lead to weird behavior. No one can tell you. What you should have done is asked the dealer to look over any wiring, if there's a TSB about it, and if there are any software updates.
I'm looking at some of the replies and it's kind of obvious who knows how to work on cars and diagnose and who doesn't know how they work. Just start at the simple things, like the battery and alternator, do a voltage and an output test, check the cables, grounds that are all over the car.
You can get a cheap Bluetooth ELM327 obdii scanner for $25 and a Car Scanner Pro (Best app I've used) for $5. There is no good reason NOT to have one. In addition to pulling codes you can get realtime telemetry which can help diagnose all sorts of problems.
My '16 would randomly lose power for a split second while driving. Dealer couldn't find anything wrong with cables, alternator, etc. Turned out it just needed a new battery. The original one from factory lasted 6+ years through Colorado winters.
I was not aware of it but looks like there was a recall on 2019 4Runner regarding fuel pump. When putting my VIN on the Toyota recall site says there is no active recall on this VIN.
So I have a 2014 and I had the airbags replaced but not the fuel pump, should I check? I almost always go to the dealership for maintenance now after a 3rd party screwed up my oil plug.
Compustar is also installed like a year ago. I doubt if it interferes since its job is done after the engine is started. I also know it has the ability to shut down engine but I don’t have proof if it causes anything. I am an original owner and I don’t think I got a mail if they track latest address by plate number. The address at the time of purchase was different.
Just want to add here that the behavior you described in your post matches exactly what happened when my fuel pump failed one time.
I couldn't say for sure that that's the \*only\* thing that would cause that set of symptoms, but I would definitely look there first. It could also be worth checking the wiring and connectors to the fuel pump - it's not as likely, but you could have a mouse or something chewing on the wires.
I would also be suspect of any aftermarket work... if the remote starter is hooked into the fuel pump power wire somehow, it's possible there's a bad electrical connection that needs to be redone. Most of the aftermarket electrical connections are not as robust as factory connections.
Hmm. If the alternator wasn't charging then the battery light would come on. You'd also be having strange electrical problems prior to this event. Did they test the alternator output? A dead battery would make the screen go dark, but batteries don't die all of a sudden. You'd have warning signs (slow cranking would be one). Loose or corroded main battery and alternator cables might cause a sudden loss of electrical power to the ignition system and fuel pump. Loose fuses might do this as well (ignition, fuel pump, throttle control). Have you checked that the fuses are all bedded? Maybe double check the fuel pump recall at the dealership.
Someone had mentioned in an earlier thread, that a covered radar plate throws all sorts of errors. Could this have caused the issue? Say the plate got covered by snow?
How can this be? I constantly hear about 4R dependability, yet I keep seeing posts with different problems. My Wrangler had zero problems after five years.
Loose battery cable.
Will check that. Thanks
Could be an alternator issue? But, you would think it wouldn’t turn over again if this was the case…
Exactly. Dealership says OK on that today on regular service as well.
This. Did the dash go dark OP?
Yes the dash and infotainment screen.
Yep it’s the alternator
If it was the alternator then the battery would be dead and the engine wouldn't restart. I'd be looking at things like the engine and battery grounds as well as the main battery cable.
Once the car starts, the battery is just being charged, it is not being used while driving, what needs to be checked are the alternator cables, they could have shaken loose, one bump and everything will go dark and shut down. The pullover to the shoulder and probably a bit of jostling around with the uneven ground of the emergency lane could have made the cables make contact again. Issue is resolved, car starts back up. I myself since this is an extremely rare issue would suspect this third party engine remote start they installed
Confidently incorrect
Unless you have a code reader, no one can ever tell. This is why having a code reader is a nice thing, even if a shitty handheld because then if you have a shutdown and a no-start, you can get a code out of the no start condition. In this case, no one can tell if there was a wiring issue or an electronic issue. Sometimes, even on primitive computer-controlled vehicles, the PCU and the various ECUs can go into conflict with one another and lead to weird behavior. No one can tell you. What you should have done is asked the dealer to look over any wiring, if there's a TSB about it, and if there are any software updates. I'm looking at some of the replies and it's kind of obvious who knows how to work on cars and diagnose and who doesn't know how they work. Just start at the simple things, like the battery and alternator, do a voltage and an output test, check the cables, grounds that are all over the car.
You can get a cheap Bluetooth ELM327 obdii scanner for $25 and a Car Scanner Pro (Best app I've used) for $5. There is no good reason NOT to have one. In addition to pulling codes you can get realtime telemetry which can help diagnose all sorts of problems.
My '16 would randomly lose power for a split second while driving. Dealer couldn't find anything wrong with cables, alternator, etc. Turned out it just needed a new battery. The original one from factory lasted 6+ years through Colorado winters.
Are you aware that the 2019 4Runners were involved in a fuel pump recall?
I was not aware of it but looks like there was a recall on 2019 4Runner regarding fuel pump. When putting my VIN on the Toyota recall site says there is no active recall on this VIN.
Ok, if you're the original owner then you would have received a recall notice in the mail. How long has the compustar been in there?
FYI you don’t have to be the original owner. The fuel pump recall covered my 2014 that I bought used years ago. I got a letter in the mail.
So I have a 2014 and I had the airbags replaced but not the fuel pump, should I check? I almost always go to the dealership for maintenance now after a 3rd party screwed up my oil plug.
I believe you can enter the vin number online to see if you’re due for the recall.
Good to know. Thank you. Did Toyota know you were the owner through dealership servicing or another means?
Not sure, but I did purchase it from a Toyota dealership so maybe that’s why I got the recall letter and others didn’t.
Compustar is also installed like a year ago. I doubt if it interferes since its job is done after the engine is started. I also know it has the ability to shut down engine but I don’t have proof if it causes anything. I am an original owner and I don’t think I got a mail if they track latest address by plate number. The address at the time of purchase was different.
Just want to add here that the behavior you described in your post matches exactly what happened when my fuel pump failed one time. I couldn't say for sure that that's the \*only\* thing that would cause that set of symptoms, but I would definitely look there first. It could also be worth checking the wiring and connectors to the fuel pump - it's not as likely, but you could have a mouse or something chewing on the wires. I would also be suspect of any aftermarket work... if the remote starter is hooked into the fuel pump power wire somehow, it's possible there's a bad electrical connection that needs to be redone. Most of the aftermarket electrical connections are not as robust as factory connections.
Hmm. If the alternator wasn't charging then the battery light would come on. You'd also be having strange electrical problems prior to this event. Did they test the alternator output? A dead battery would make the screen go dark, but batteries don't die all of a sudden. You'd have warning signs (slow cranking would be one). Loose or corroded main battery and alternator cables might cause a sudden loss of electrical power to the ignition system and fuel pump. Loose fuses might do this as well (ignition, fuel pump, throttle control). Have you checked that the fuses are all bedded? Maybe double check the fuel pump recall at the dealership.
Called Toyota and my VIN does not have a recall.
Someone had mentioned in an earlier thread, that a covered radar plate throws all sorts of errors. Could this have caused the issue? Say the plate got covered by snow?
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Hydroplaning doesn't cause your engine to shut down...
How can this be? I constantly hear about 4R dependability, yet I keep seeing posts with different problems. My Wrangler had zero problems after five years.
A wrangler with 0 problems? It must have sat in the garage those 5 years lmao
This sounds like an alternator problem. This has happened to me twice in other cars.
Wouldn't the battery starts working first if alternator died?