2007 Mazda 3 AT Issue - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 6 (permalink) Old 02-16-2019, 12:59 PM Thread Starter
Bicycle Rider
 
Join Date: May 2017
Location: Indiana
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2007 Mazda 3 AT Issue

A few weeks ago, got in 2007 Mazda 3 and started it up like normal. Put in reverse and felt strong jolt. Noticed AT light on dash. Also, noticed car was apparently in limp mode as the accelerator pedal was non-responsive. Read the codes and got a P0123 - Throttle position sensor.

To my knowledge, this car does not have a separate TPS, it is part of the throttle body. Please let me know if that is incorrect. I removed the throttle body and cleaned it thoroughly. Also, noticed that the black plastic housing on one end was cracked, but not separated. Put it back on the car, cleared the codes, disconnected the battery for about 30 mins, then started it up. Same issue.

Thinking something must be wrong with throttle body, I put a new one on. Cleared the codes, disconnected battery for several minutes, then started it up. Same issue.

Read something about the input speed sensor on the transmission being a potential issue. Replaced it, cleared the codes, disconnected battery, started it up. Same issue.

Not sure where to go next. Would like to think that tranny is not toast, but not sure now. The car is not driveable. No accelerator response until you get past about 80% to the floor. Feel like I would get killed trying to drive it somewhere to get checked out. Towing is an option, but would be a waste if it is truly the transmission, as the car would basically be totaled. 2007 with 190k miles on it. Would like to keep driving it if I can fix it, but hope is beginning to fade.

Appreciate any ideas you have. Anyone ever experienced this?

Thanks
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post #2 of 6 (permalink) Old 02-17-2019, 09:02 AM
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Quote:
Originally Posted by GoJo View Post
... Same issue...
I'm assuming you're saying that it's still setting a P0123 OBD code. If so, you need to test the TPS wiring with a multimeter.
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2011 3i 2.0 A/T 130K miles (daughter's ride which I maintain)
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post #3 of 6 (permalink) Old 02-17-2019, 05:14 PM
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Quote:
Originally Posted by m3iguy View Post
I'm assuming you're saying that it's still setting a P0123 OBD code. If so, you need to test the TPS wiring with a multimeter.
Good suggestion. Also, the A/T light means that you should also check for codes in the transmission ECU. Will need more than a basic code reader that only checks engine ECU codes to be able to access the TCM. That code along with the TPS code from the PCM may lead to a common denominator.

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post #4 of 6 (permalink) Old 02-21-2019, 08:34 PM
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Quote:
Originally Posted by GoJo View Post
A few weeks ago, got in 2007 Mazda 3 and started it up like normal. Put in reverse and felt strong jolt. Noticed AT light on dash. Also, noticed car was apparently in limp mode as the accelerator pedal was non-responsive. Read the codes and got a P0123 - Throttle position sensor.

To my knowledge, this car does not have a separate TPS, it is part of the throttle body. Please let me know if that is incorrect. I removed the throttle body and cleaned it thoroughly. Also, noticed that the black plastic housing on one end was cracked, but not separated. Put it back on the car, cleared the codes, disconnected the battery for about 30 mins, then started it up. Same issue.

Thinking something must be wrong with throttle body, I put a new one on. Cleared the codes, disconnected battery for several minutes, then started it up. Same issue.

Read something about the input speed sensor on the transmission being a potential issue. Replaced it, cleared the codes, disconnected battery, started it up. Same issue.

Not sure where to go next. Would like to think that tranny is not toast, but not sure now. The car is not driveable. No accelerator response until you get past about 80% to the floor. Feel like I would get killed trying to drive it somewhere to get checked out. Towing is an option, but would be a waste if it is truly the transmission, as the car would basically be totaled. 2007 with 190k miles on it. Would like to keep driving it if I can fix it, but hope is beginning to fade.

Appreciate any ideas you have. Anyone ever experienced this?

Thanks
Just wondering, does the transmission work normally for even a couple minutes upon starting the car?

Also, the cracked housing could be a problem if the crack is on the side part the throttle body and not before the throttle body. After it allows air to enter and not be run by the sensors.
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post #5 of 6 (permalink) Old 09-03-2019, 11:12 AM
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Just had this issue with my 06 hatchback with 192,000 miles. Thought it was the transmission mount but original mount looked good and new mount didn't make any difference. Ended up being the TCM (Transmission Control Module). I used this site: https://store.allcomputerresources.c...r-service.html

to repair the unit. Took about a week and works great but now I'm experiencing some other issues that I think are completely unrelated (p0011 and p0016), stalling and rough idle that appeared several days later
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post #6 of 6 (permalink) Old 09-04-2019, 06:53 PM
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Echoing above, you probably need a good scanner to see the TCM codes. I had the AT light a few years ago and had it repaired by www.ModuleRepairPro.com
They have a lifetime warranty on the repair and I had no issues for two years until I sold the car.

Hope that is helpful
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