Shifter post ECM replacement

Tiny
KEELYALEECESHANKS
  • MEMBER
  • 2004 MAZDA 3
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 23,000 MILES
I bought the car listed above that needed a new ECM. We cranked the car before bumper pulling it just to see if it would start. It did, yadda yadda, turned key on but did not start it, put car in N, release all brakes, and pull. About 15 miles down the road we pull over, put in transmission fluid and start the car allowing the fluid to run through the gears. Off again start pulling. Five miles later the shifter makes a popping noise and my steering wheel locks up completely. Able to push it to the side of the road, we put the battery back on, turn it on (not over) unlock the steering wheel, remove battery and begin to bumper pull it straight to the house. Once there, we put the battery back on and start it so transmission fluid can run through the gears again. As I go to shift the gears, it shifts up to park, back to reverse and gets stuck. As in stuck in reverse on the dash. Shifter moves but gears don't change. 2 weeks later I replace the ECM with a preprogrammed to my VIN ECM and the dash says it's in drive. It will shift down to manual on dash and shifter but still does not show shift for anything above Drive and the wheels don't move. So it's definitely not in neutral. Help me fix my mommy mobile!
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Saturday, June 12th, 2021 AT 4:08 AM

2 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

The range sensor for the transmission controls what position shows on the selector.

I posted the procedure for the replacement of the sensor for you.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

You need to get that resolved first before seeing if there are other issues with the transmission. If the incorrect signal is sent to the ECM, the transmission will not operate correctly.

Roy
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Saturday, June 12th, 2021 AT 5:22 AM
Tiny
ASEMASTER6371
  • EXPERT
I got an email that you replied but nothing came through.

Can you resend your response?

Roy
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Saturday, June 12th, 2021 AT 6:22 AM

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