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Old 10-13-2013, 03:18 PM   #1
ThatDaveGuy
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Default 2002 SC2 Won't Shift

SC2 w/114k, automatic trans will not shift out of 1st.
No Check Engine Light, no codes.
Installed a replacement trans from a boneyard but it too will not shift out of 1st. But now we have codes - they say incorrect gear ratio for 2nd, 3rd, & 4th. Is this a bad transmission or is there a PCM issue?

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Old 10-13-2013, 05:19 PM   #2
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1996 SW2
Default Re: 2002 SC2 Won't Shift

What number of transmission did you install? From what model of car did it come?

Do you still have the old transmission? How recently, and how frequently, were the fluid and filter changed?

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Old 10-13-2013, 08:22 PM   #3
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Default Re: 2002 SC2 Won't Shift

The exact codes are P0732, 733, and 734.

The SN on the old trans is 82Z156136 - I'll have to remove the coil pack to read it from the replacement.

The VIN on the car: 1G8ZY12712Z156136
The VIN of the donor car: 1G8ZH52802Z275232 - it was printed on the label from the boneyard.

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Old 10-13-2013, 09:09 PM   #4
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1996 SW2
Default Re: 2002 SC2 Won't Shift

The donor transmission came from a 2002 SL1, an SOHC car. The transmission will not work in your car.

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Old 10-13-2013, 09:09 PM   #5
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Default Re: 2002 SC2 Won't Shift

According to your Vin#s the 8th number on your car is 7 and the donor car is a 8 you installed the SOHC Auto trans in your DOHC car thats the wrong Transmission, the gear ratios are different for the SOHC car, you need a transmission out of a DOHC car.

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Old 10-16-2013, 04:58 PM   #6
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Default Re: 2002 SC2 Won't Shift - Update

The boneheads at the boneyard had mislabeled the trans in their inventory.
So we got the correct model trans but from a 1999 car.

The trans shifts but VERY hard.
Before installation we drained the fluid, replaced the front seal and the filter. Once in place, we added fresh fluid.

I've seen references to some sort of a re-learn procedure for the PCM. Is this something we should try and if so, can someone post the instructions of a link?

Thanks!

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Old 10-16-2013, 06:29 PM   #7
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Default Re: 2002 SC2 Won't Shift - Update

Just drive it smoothly and gently. It defaults to very hard shifts and gradually decreases line pressure until a happy median is reached. If you have messed up its learning cycle, then pull the PCM B fuse and start over - poorly learned behavior takes forever to go away.

Takes about an hour and maybe 30 miles in my experience.

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