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Old 07-28-2022, 06:03 PM   #1
Keblar
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2002 SL2
Default Troubleshooting TAAT Hard Shift

I've been scouring the archives for troubleshooting tips on transmission hard shifting. It's never had what I'd call reverse "slam" but reverse has been finicky and a little hard for years. As long as you were patient and held the brake until actually shifted though, it was fine.

Recently though it began hard shifting in all ranges. With a P0706 code (transmission range sensor). Downshift was even rougher. Even violent sometimes. Hard enough up and down to stop driving for fear of damage. Plus now reverse definitely has a "slam".

I cleared the PCM - No change. Did a fluid and filter change with Valvoline Blue (Hence my TranSynd and TES 295 questions last week). It was dark and definitely needed it, but not burnt or black - still, no change.

I ran the Wolfman Reverse Slam Fix, although without any additive, not expecting it to actually do anything. BUT, while the upshift and reverse are still hard, the downshift jerk is almost completely gone. I may actually try some seafoam trans tune and run the fix again since I plan on refilling with full synth anyway to see if the "fix" helps anything else. I doubt it but...

I still have to confirm the Transmission range sensor switch too, but I haven't seen any other transmission codes since resetting the PCM.

Still it IS seeming more and more like I'll need a rebuilt valve body. Going to keep looking to see if I'm missing any other possibilities.
...
2002 SL2 335k + Miles
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Old 07-30-2022, 07:48 PM   #2
Keblar
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Default Re: Troubleshooting TAAT Hard Shift

I tested the Transmission Range Sensor / Switch as shown in the RichPin video and got no continuity tone when shifted into drive.

I loosened up the bolts to see if i could adjust it, but still got zero tone throughout the full range of adjustment. This means the switch is just bad, right? Am I missing anything? If i understand correctly, even an electrical issue wouldn't matter in this case. The continuity test just indicates that the internal switch isn't closing, and electrical connections play no part in this. I think I read someplace that the test can even be done without the key turned on.

Edit: Fetchitfido provided the FSM for the switch replacement procedure in THIS POST and it doesn't even indicate to "Connect the transaxle range switch harness connectors" until after the range has been set testing continuity on the new switch. In which case, I'm ordering a new switch.
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2002 SL2 335k + Miles

Last edited by Keblar; 07-30-2022 at 07:57 PM. Reason: New info
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Old 07-30-2022, 11:55 PM   #3
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Default Re: Troubleshooting TAAT Hard Shift

I'm not sure which switch terminals you are using for the adjustment, but if you use the correct ones there will be continuity (tone) in only P and N; can't use any forward gear or R.
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Old 07-31-2022, 10:27 AM   #4
Keblar
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Default Re: Troubleshooting TAAT Hard Shift

Quote:
Originally Posted by billr View Post
I'm not sure which switch terminals you are using for the adjustment, but if you use the correct ones there will be continuity (tone) in only P and N; can't use any forward gear or R.
From the FSM:
"Place the transaxle in Drive (D). Use an ohmmeter or continuity tester to check for continuity across terminals on the selector switch. Rotate the transaxle range switch from the left fender towards the engine until continuity is achieved."

This uses the 2 terminals from the single plug on the very top, not from the connectors on the side. I assume The P and N test you're referring to are for the Neutral Safety Switch portion. Not sure since I've thankfully never had to test that. [knock, knock]
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Old 07-31-2022, 01:38 PM   #5
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Default Re: Troubleshooting TAAT Hard Shift

Yeah, my mistake on the P/N vs D, sorry. I'm old and it was late at night, that's my excuse and I'm sticking with it!

That top "test" terminal is separate from the range function, and has a quite narrow range of contact compared to the range switch. Point is, The range function may still be OK, and can be easily checked using live-data. I would not rush to change that switch just yet. On my gen1 the switch was easy to disassemble, yours may be the same and you could peek inside to inspect or verify how it operates.

I don't think the range switch will cause harsh shifts, anyway. That is controlled by the "fill time" for the clutches and line-pressure (LP). Both can be checked using live-data and a pressure gauge.

Have you checked the LP fuse and solenoid? Have you done the "fuse pull" test for LP?
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Old 07-31-2022, 04:14 PM   #6
Keblar
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2002 SL2
Default Re: Troubleshooting TAAT Hard Shift

The LP Fuse checks out, but I haven't done the "fuse out" test (i over looked that procedure), or tested the solenoid. Given the 0706 code I wasn't going to open the valve body cover until I checked out the switch 1st. When I couldn't get continuity I assumed it was bad didn't go any further.

I read that the sweet spot for the D test was small, so slid the switch pretty slowly and left a little friction on the bolts when checking/adjusting. It's not impossible that i missed it, but man, if the adjustment needed is THAT fine, I'm not sure anyone ever manages.

I haven't been able to find my scanning dongle anyway, and the switch is ordered. At the risk of wasting $60 on the part, I'll probably have to wait until the new one is installed and move on to solenoids and line pressure afterwards if it isn't solved. I'll need a line pressure gauge and possibly new scanning tool before then anyway if I can't locate it.

I am a little confused though, is the line pressure solenoid separate from the other solenoids on the valve body? Would it be included in a rebuilt body, or would it have to be ruled out / replaced on its own regardless?
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