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2003 Mazda MPV Trans


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tdigreg
User

Jun 7, 2018, 9:09 AM

Post #1 of 15 (313 views)
2003 Mazda MPV Trans Sign In

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
Hammer Time profile image

Jun 7, 2018, 1:18 PM

Post #2 of 15 (252 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (248 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (236 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (234 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (231 views)
Re: 2003 Mazda MPV Trans Sign In


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
Hammer Time profile image

Jun 7, 2018, 2:16 PM

Post #7 of 15 (221 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (169 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (150 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (148 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (144 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (138 views)
Re: 2003 Mazda MPV Trans Sign In

No, it does not



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

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 15 (132 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (128 views)
Re: 2003 Mazda MPV Trans Sign In

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 15 (94 views)
Re: 2003 Mazda MPV Trans Sign In


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.)






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