P0722 after Engine swap.

3131 Views 3 Replies 2 Participants Last post by Harvey's Autohaus, Jul 21, 2010

Jeff_Wolf

Discussion Starter · Jul 21, 2010

I bought a 99' 9-5 Sedan with a bad transmission and a 00' 9-5 Sedan with a bad motor with the intention of mating the good transmission to the good motor inside the 00' body. I removed both powertrains without breaking anything major and swapped the wiring harness, intake manifold and brake booster pump onto the 99' engine, again, without any major difficulty and then put the new powertrain into the car.

I also did maitenance items like dropping the oil pan, installing new strainer, cleaning any sludge out of the top, checking the timing chain... ect.

The car is an automatic.

Upon reconnnecting everything it started up with no problem. I go to put it reverse to back it off the lift and NOTHING and the same with every other gear. The idle drops as it normally would when going being put into a gear but no movement in any gear and with any amount of throttle.

After 5 minutes or so of shifting back and forth the dash lights up and the transmission light comes on w/ the engine light. I say to myself, "Good, atleast now I'll know." I go in to the garage and grab Tech 2 and pull P0722 with it. So, upon googling the the numerous articles and looking in WIS and EPC, I look for ground issues and wiring harness faults. I can find none. I also switched the sensor out with the one off of the bad transmission and put that in. No dice. Still giving me a P0722 code and not moving. I'm wondering if I missed something stupid or the transmission is shot...

The transmission is in the car and uses the same harness that it was originally put in so I don't think it's that.

If anyone has ever done a swap and had this problem I would love to hear about it and any possible solutions anyone might have.

Thanks

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Harvey's Autohaus

· #2 · Jul 21, 2010 (Edited)

even though po722 is an out put signal code, Did you make sure the torque converter rubbed on the inside of the transmission case when you installed the engine? The torque converter has a two step input when getting it to engage into the transmission oil pump. If the torque converter isn't engaged it to the transmission pump all the way than you get nothing. No output.... = torque converter not in all the way = No input No out put. Or the pins have backed out of the trans connector "Look Closely" Or you tore a wire. That's about it.

When you spun the torque converter it should have rubbed a little on the inside of the Bell housing/trans case. That way you know the TQ is engaged in the pump all the way before reassembly.

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Jeff_Wolf

Discussion Starter · #3 · Jul 21, 2010

Your talking the torque converter should have been rubbing against the back of the case, the front being where the bell housing meets with the engine.

I don't recall it rubbing but I do recall when spinning the torque converter in it would spin around until it dropped down onto those two notches. I couldn't get a finger in behind it.

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Harvey's Autohaus

· #4 · Jul 21, 2010

Jeff_Wolf said:
Your talking the torque converter should have been rubbing against the back of the case, the front being where the bell housing meets with the engine.

I don't recall it rubbing but I do recall when spinning the torque converter in it would spin around until it dropped down onto those two notches. I couldn't get a finger in behind it.

Thats Great then. You just need to Inspect that harness over every inch. & especially the pins at the connectors. I've found quite a few backed out.

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