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2003 Mazda MPV Trans


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tdigreg
User

Jun 7, 2018, 9:09 AM

Post #1 of 19 (735 views)
  post locked   2003 Mazda MPV Trans  

Working on someone elses 2003 MPV. When they brought it their complain was transmission harsh engagement and harsh shifts. The OD OFF light was flashing; tried to pull codes with scan tool-none. Jumpered the pins in the diagnosic box under the hood-no codes. Passed stall test, resistance and live tested all the solenoids through a connector on top the trans-all within spec. Put a line pressure gauge on the trans and its got good pressure actually just a little over spec; but, when it shifts into forth the pressure drops to zero. Ive changed the fluid and while it was dark, it smelled ok and there wasn't any noticeable chunks or debris. Now I discovered a P0327 code for a knock sensor. There's continuity to the sensor connector, no shorts, but there's no voltage from the pcm. There could possibly be a connection between the code and the trans.


Hammer Time
Ultimate Carjunky / Moderator
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Jun 7, 2018, 1:18 PM

Post #2 of 19 (674 views)
  post locked   Re: 2003 Mazda MPV Trans  

If the OD light is flashing then there are codes in the TCM and you will need a high end scan tool capable of accessing the TCM.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tdigreg
User

Jun 7, 2018, 1:45 PM

Post #3 of 19 (670 views)
  post locked   Re: 2003 Mazda MPV Trans  

Hey thanks for getting back with me. I was using a snap on verus.


Hammer Time
Ultimate Carjunky / Moderator
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Jun 7, 2018, 1:58 PM

Post #4 of 19 (658 views)
  post locked   Re: 2003 Mazda MPV Trans  

Were you accessing the TCM or the PCM?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tdigreg
User

Jun 7, 2018, 2:01 PM

Post #5 of 19 (656 views)
  post locked   Re: 2003 Mazda MPV Trans  

I just went to move it out of the shop--the problem's gone altogether. I had thrashed on it pretty hard before parking it.Unsure


tdigreg
User

Jun 7, 2018, 2:11 PM

Post #6 of 19 (653 views)
  post locked   Re: 2003 Mazda MPV Trans  


In Reply To
Were you accessing the TCM or the PCM?

Both.

I did some more driving with the gauge on it; it shifts great, the line pressure is dead on spec at idle not a little over like before, no light but it still drops line pressure to zero in forth.


(This post was edited by tdigreg on Jun 7, 2018, 2:13 PM)


Hammer Time
Ultimate Carjunky / Moderator
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Jun 7, 2018, 2:16 PM

Post #7 of 19 (643 views)
  post locked   Re: 2003 Mazda MPV Trans  

We have a trans expert here, gsferraro. He will be along eventually but if that OD light flashes again, try to get the codes. It probably had some sort of power interruption to lose them, possibly when you disconnected the trans connector to pin test.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



gsferraro
Enthusiast

Jun 9, 2018, 4:47 PM

Post #8 of 19 (591 views)
  post locked   Re: 2003 Mazda MPV Trans  

Hello,
On these transmissions, number one common issue is the high clutch piston cracks, they have been updated since. When the piston cracks(most of the time you cant see the crack) it will affect 3rd,4th,and 5th gears, may give you flared or runaway shifts. Gary


tdigreg
User

Jun 11, 2018, 6:01 AM

Post #9 of 19 (572 views)
  post locked   Re: 2003 Mazda MPV Trans  

I'm pretty sure though I haven't proven it yet; that my issues are knock sensor related. I had the knock sensor code when I was having tranny trouble, presently the trans is acting ok and the only thing I know I did was that I left the t-pins in the knock sensor connector.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 11, 2018, 6:09 AM

Post #10 of 19 (570 views)
  post locked   Re: 2003 Mazda MPV Trans  

The knock sensor input effects ignition timing, not transmission issues.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tdigreg
User

Jun 11, 2018, 6:25 AM

Post #11 of 19 (566 views)
  post locked   Re: 2003 Mazda MPV Trans  

But wouldn't the tcm need a knock sensor input?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 11, 2018, 6:41 AM

Post #12 of 19 (560 views)
  post locked   Re: 2003 Mazda MPV Trans  

No, it does not



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tdigreg
User

Jun 11, 2018, 7:42 AM

Post #13 of 19 (554 views)
  post locked   Re: 2003 Mazda MPV Trans  

Then why is it "fixed" when the knock sensor is ok?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 11, 2018, 8:29 AM

Post #14 of 19 (550 views)
  post locked   Re: 2003 Mazda MPV Trans  

I don't know it probably isn't. I have looked at the wiring diagram for the TCM and there is no knock sensor in the circuit.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



tdigreg
User

Jun 13, 2018, 6:29 AM

Post #15 of 19 (516 views)
  post locked   Re: 2003 Mazda MPV Trans  


Quote
On these transmissions, number one common issue is the high clutch piston cracks, they have been updated since. When the piston cracks(most of the time you cant see the crack) it will affect 3rd,4th,and 5th gears, may give you flared or runaway shifts.

Would this be an intermittent problem? (It's acting up again. No surprise 'cause I didn't fix anything.)


tdigreg
User

Jul 13, 2018, 12:16 PM

Post #16 of 19 (293 views)
  post locked   Re: 2003 Mazda MPV Trans  

WinkWinkWinkReplaced knock sensor and it's fixed!!!!!!!!!!!CoolCoolCoolCool


tdigreg
User

Jul 13, 2018, 12:19 PM

Post #17 of 19 (291 views)
  post locked   Re: 2003 Mazda MPV Trans  

BTW thanks for ALL the help.LaughLaughLaughLaugh


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jul 13, 2018, 1:00 PM

Post #18 of 19 (282 views)
  post locked   Re: 2003 Mazda MPV Trans  

That's a new one.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
Veteran / Moderator
Sidom profile image

Jul 13, 2018, 3:26 PM

Post #19 of 19 (272 views)
  post locked   Re: 2003 Mazda MPV Trans  


In Reply To
WinkWinkWinkReplaced knock sensor and it's fixed!!!!!!!!!!!CoolCoolCoolCool


mmmmm....I don't think so.....






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