Tranny guys inside----> Couple of questions on TCC
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Joined: Feb 2001
Posts: 187
From: in the 951
Tranny guys inside----> Couple of questions on TCC
Ok, just scanned the computer and immediately got a DTC 37, Brake switch stuck on. This is something I am going to get replaced as soon as the dealers are open on Tuesday.
I mention that because maybe it will have something to do witht he problem I am seeing.
When I put the car in OD, I watch the logs and the TCC DC goes from 0 to 90.17% at 6 MPH. Of course locking up at that slow of a speed makes the slip speed somewhere around 300 RPM. If I keep accelerating, the TCC stays locked up and the slip rpm will go down, but I'm observing the following:
1. TCC goes to 90.17% (and stays there) ANYTIME I go iver 6mph
2. TCC is either 0 or 90.17% I never see 100% or any other numbers
3. The TCC doesn't seem to care about TPS, because it comes on even with the TPS at 35% (It may be even more but I didn't get over 35% tps on the run I logged)
4. If I accelerate really slowly on the fwy (Keep TPS % below 12 or so) I can get up to 75MPH with a very small amount of slip rpm (Around 10-20), however if I take my foot off the gas, then give it a little more TPS (Around 15-20%) she will once again have a 200-300 RPM slip RPM.
I looked at some logs I had from a while ago, when the brake switch DTC was not there, and I observed the same TCC/Slip RPM problem.
My question is this. Is the Torque Convertor fried, or do I need a new TCC Solenoid? Or is there something in the ECM that could be programmed to make it act like this? I haven't looked at the program yet, I just ordered tunercat and I don't expect to get the definition file until tuesday as well.
Thanks in advance. If you're interested in the Datamaster logs, you can find them here.
I mention that because maybe it will have something to do witht he problem I am seeing.
When I put the car in OD, I watch the logs and the TCC DC goes from 0 to 90.17% at 6 MPH. Of course locking up at that slow of a speed makes the slip speed somewhere around 300 RPM. If I keep accelerating, the TCC stays locked up and the slip rpm will go down, but I'm observing the following:
1. TCC goes to 90.17% (and stays there) ANYTIME I go iver 6mph
2. TCC is either 0 or 90.17% I never see 100% or any other numbers
3. The TCC doesn't seem to care about TPS, because it comes on even with the TPS at 35% (It may be even more but I didn't get over 35% tps on the run I logged)
4. If I accelerate really slowly on the fwy (Keep TPS % below 12 or so) I can get up to 75MPH with a very small amount of slip rpm (Around 10-20), however if I take my foot off the gas, then give it a little more TPS (Around 15-20%) she will once again have a 200-300 RPM slip RPM.
I looked at some logs I had from a while ago, when the brake switch DTC was not there, and I observed the same TCC/Slip RPM problem.
My question is this. Is the Torque Convertor fried, or do I need a new TCC Solenoid? Or is there something in the ECM that could be programmed to make it act like this? I haven't looked at the program yet, I just ordered tunercat and I don't expect to get the definition file until tuesday as well.
Thanks in advance. If you're interested in the Datamaster logs, you can find them here.
Thread Starter
Registered User
Joined: Feb 2001
Posts: 187
From: in the 951
I just remembered one other thing...
With this car, when you take your foot off the gas, it feels exactly like a clutch is engaged because you hear and feel the engine compression braking. Is this normal? On almost every other auto I've driven, when you take your foot off the gas it would "coast"?
I've found it will "coast" if you take your foot off the gas, and then reapply to the gas a very small amount (TPS of < 5%)
With this car, when you take your foot off the gas, it feels exactly like a clutch is engaged because you hear and feel the engine compression braking. Is this normal? On almost every other auto I've driven, when you take your foot off the gas it would "coast"?
I've found it will "coast" if you take your foot off the gas, and then reapply to the gas a very small amount (TPS of < 5%)
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