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tdigreg
User
Jun 7, 2018, 9:09 AM
Post #1 of 19
(3479 views)
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2003 Mazda MPV Trans
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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.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 7, 2018, 1:18 PM
Post #2 of 19
(3418 views)
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Re: 2003 Mazda MPV Trans
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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.
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tdigreg
User
Jun 7, 2018, 1:45 PM
Post #3 of 19
(3414 views)
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Re: 2003 Mazda MPV Trans
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Hey thanks for getting back with me. I was using a snap on verus.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 7, 2018, 1:58 PM
Post #4 of 19
(3402 views)
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Re: 2003 Mazda MPV Trans
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Were you accessing the TCM or the PCM?
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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.
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tdigreg
User
Jun 7, 2018, 2:01 PM
Post #5 of 19
(3400 views)
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Re: 2003 Mazda MPV Trans
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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.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 7, 2018, 2:16 PM
Post #7 of 19
(3387 views)
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Re: 2003 Mazda MPV Trans
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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.
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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.
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gsferraro
Veteran
Jun 9, 2018, 4:47 PM
Post #8 of 19
(3335 views)
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Re: 2003 Mazda MPV Trans
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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
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tdigreg
User
Jun 11, 2018, 6:01 AM
Post #9 of 19
(3316 views)
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Re: 2003 Mazda MPV Trans
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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.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2018, 6:09 AM
Post #10 of 19
(3314 views)
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Re: 2003 Mazda MPV Trans
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The knock sensor input effects ignition timing, not transmission issues.
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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.
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tdigreg
User
Jun 11, 2018, 6:25 AM
Post #11 of 19
(3310 views)
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Re: 2003 Mazda MPV Trans
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But wouldn't the tcm need a knock sensor input?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2018, 6:41 AM
Post #12 of 19
(3304 views)
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Re: 2003 Mazda MPV Trans
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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.
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tdigreg
User
Jun 11, 2018, 7:42 AM
Post #13 of 19
(3298 views)
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Re: 2003 Mazda MPV Trans
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Then why is it "fixed" when the knock sensor is ok?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 11, 2018, 8:29 AM
Post #14 of 19
(3294 views)
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Re: 2003 Mazda MPV Trans
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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.
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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.
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tdigreg
User
Jul 13, 2018, 12:16 PM
Post #16 of 19
(3037 views)
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Re: 2003 Mazda MPV Trans
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 Replaced knock sensor and it's fixed!!!!!!!!!!!
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tdigreg
User
Jul 13, 2018, 12:19 PM
Post #17 of 19
(3035 views)
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Re: 2003 Mazda MPV Trans
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BTW thanks for ALL the help.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 13, 2018, 1:00 PM
Post #18 of 19
(3026 views)
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Re: 2003 Mazda MPV Trans
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That's a new one.
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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.
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Sidom
Veteran
/ Moderator
Jul 13, 2018, 3:26 PM
Post #19 of 19
(3016 views)
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Re: 2003 Mazda MPV Trans
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mmmmm....I don't think so.....
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