Mazda 3 2009 automatic - Engine stalling problem

Tiny
SANA01200
  • MEMBER
  • 2009 MAZDA 3
  • 2WD
  • AUTOMATIC
  • 40,400 MILES
My car is Mazda 3 bought as brand new in 2009. Current mileage is about 65000km (approx. 40400 miles).

My car died suddenly while I was driving in August 2013. Basically the engine was turned off and I couldn't restart the car. After some difficulties (3 weeks for a diagnostic), a mechanic (Mazda dealer) diagnosed that we need to replace a PCM. So we did.

2 weeks ago I faced the exactly same problem again. Only difference this time is that I could restart the car. However, the car engine stalled for a few time within about 5 kilometers. My car was sent back to the garage again. A mechanic cannot find a problem at all….

Any suggestion?
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Thursday, March 13th, 2014 AT 1:20 AM

6 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Is the vehicle presently running properly?
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Thursday, March 13th, 2014 AT 5:26 AM
Tiny
SANA01200
  • MEMBER
Hello Tiny

It runs fine but stops soon while I am driving so I have to restart again.

I just received a quick message from the garage telling me the problem is the instrument cluster (combiné des instruments est défectueux) if I understand him correctly.

Q: Is this problem difficult to identify?
He took more than 10 days to diagnose.

Q: Could this problem be related to the previous PCM problem?
The problem this time is the exactly the same as last time.

It's just under 5 year old but I need to get a new car if the problem persists . It has already cost me thousands of EUR .

Any advice will be greatly appreciated.
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Thursday, March 13th, 2014 AT 6:10 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I have to be honest. I can't think of anything in the instrument cluster that would cause the engine to shut down. Is the check engine light still coming on? And yes, the PCM could be causing the issue.
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Thursday, March 13th, 2014 AT 8:33 AM
Tiny
SANA01200
  • MEMBER
Thank you very much for your quick reply again.

As for the check engine light, I am not sure if it's coming on nor not. I have to ask the mechanic. If it's coming on, what does it mean? Sorry about this stupid question.

According to his repair estimate, a speedometer needs to be replaced . How come? Did you come across a similar problem?

He also noted the continuity between the instrument cluster and PCM need to be checked (le control de la continuite entree le PCM et le combine d'instrument ) requiring 2H.

I am not a tech savvy but feel it is the PCM problem or he somehow didn't connect well last time he installed the PCM .

Total 1800 EUR.

I am not convinced at all.
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Thursday, March 13th, 2014 AT 10:04 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I'm not sure how the speedo would cause the engine to stall. If the speed sensor is bad, it will cause shifting problems and the speedo wouldn't work correctly or not at all. As far as the electrical test, he is just checking to see if there are any broken wires (open circuits).
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Friday, March 14th, 2014 AT 8:38 AM
Tiny
SANA01200
  • MEMBER
I see. I found a post on the web, who had a similar problem as mine and somebody suggested to check the speed sensor also.

To answer to your previous question if the check engine light is coming on or not, basically all the lights of the instrument panel lit up when the engine died and the gear indicator counted down through the gears 4, 3, 2, 1, until the car simply coasted to a halt. It was simply the matter of restart of the engine to proceed for a while until the next failure.

Sorry to ask you again but just to confirm your opinion that the instrument panel generally and a speedometer specifically should have no such impact on the engine management and therefore can't be the cause of the engine failure? Would we be correct also in our understanding that such control of the engine is the primary function of the "PCM"?

Thank you very much again for your expertise and advice. We really appreciate it as we feel this garage is simply trying to avoid his responsibilities under the warranty for the replacement of the PCM last year.
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Sunday, March 16th, 2014 AT 11:15 AM

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