Hi, i purchased nissan sentra 2014 with 110,000 miles on it. It started stalling on the go. I have diagonised it in nissan dealership and replaced the trottle body the problem didnt get fixed. i have no engine check light on the dashboard. If i disconnect the battery for some time and connects it after 3 minutes, it starts. when it stops i need to repeat the process again. can anyone know the issue ?
I have replaced mass air flow sensor, pvc valve, trottle body.
@kalyan-kurusali please keep all of your posts about this issue in this thread. Don't make a new Top Post about it.
To expand on Scotty's reply, not only are you resetting the ECM when you disconnect the battery you're also resetting all of the control modules when you do that. Modules like the Body Control Module, ABS module, Transmission Control Module...
Understand that all of these control modules are computers and they all communicate with the ECM (and each other) on a network. Any 1 of those control modules are capable of scrambling the network voltage signals (if it's malfunctioning) and taking down the entire communication . Nissan has a Fail Safe built into the ECM control if it loses communication with the BCM which can keep the car running, but if a control module is scrambling the network that won't work.
Not only that, the IPDM (underhood fuse box) also communicates on the network. It has the relays which provide power to the ECM, fuel pump, ignition system to name a few things and it's notorious for being problematic and it could just as easily be your problem.
In your case, you can't jump to the conclusion that you have a faulty ECM because it's very unlikely. You need someone who can check power and grounds to (and from) the IPDM and the ECM and also who has a good scanner (and who knows how to use it) to see if they can communicate with the ECM and all of the control modules when the car dies. They may need to connect a scope to the network to observe the voltage signal square waves to help diagnose the problem. Dealerships aren't very good at this type of diagnostic. They like to swap parts.
The one thing YOU can do when the car stalls is to check if you're getting spark and check if you're getting fuel. That could point you in the right direction. There's hundreds of youtubes on how to check for spark and fuel. This could be something as simple as a failing crankshaft position sensor or another sensor that's shorting out the 5 volt reference signal and dragging the other sensors on the circuit down with it. So start by checking for spark and fuel during a no start right after it stalls.
Come back to this thread and tell us what you find out
Well when you disconnect the battery all that does is reset the computer. So it seems like you have some type of computer module problem. Those can be absolute hell to diagnose. Good luck!
hey scotty, can you suggest me a good solution to this problem ?
Anything done at the dealership will be a disaster. Get a competent, independent mechanic.
should I repair the car or sell it ?
if i reprogramme the ecm unit at the delarship, will it solve the issue ?
if i get used one, that needs to be reprogrammed at the dealer. can anyone give me a good solution to this ?
hi, i tried replacing the mass airflow sensor from autozone, the car ran very good for 2000 miles and now its not starting again. the dealership people tested the car with new MAF sensor from nissan and it solved the issue. if i replace the part from the showroom will i get the same issue again ?