Torque converter engages too early

[22catch22]

Torque converter locks up/engages around 15-20 mph instead of around 40 mph. One specialist believes this may be due to a computer calibration problem? Any ideas?

 

[Mustangless]

what gear are you talking about.

second
TP MPH
4.98 32.00
1.58 32.00
1.09 20.00
0.98 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00

third
TP MPH
4.98 46.00
1.23 46.00
0.86 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50

fourth
TP MPH
4.98 97.00
1.84 97.00
1.35 78.00
0.49 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50

this is what the u4p0 tells it to lockup at. So in second gear 15-20 is normal.

TP is the throttle position. No throttle is usually around .95ish

 

[toyman]

what gear are you talking about.

second
4.98 32.00
1.58 32.00
1.09 20.00
0.98 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00

third
4.98 46.00
1.23 46.00
0.86 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50

fourth
4.98 97.00
1.84 97.00
1.35 78.00
0.49 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50

this is what the u4p0 tells it to lockup at. So in second gear 15-20 is normal.

Huh!! What do the numbers represent? I've got some issues with my AEM-EMS and would like to better understand some of the settings.

Thanks

 

[22catch22]

what gear are you talking about.

second
4.98 32.00
1.58 32.00
1.09 20.00
0.98 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00
0.00 9.00

third
4.98 46.00
1.23 46.00
0.86 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50
0.00 18.50

fourth
4.98 97.00
1.84 97.00
1.35 78.00
0.49 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50
0.00 35.50

this is what the u4p0 tells it to lockup at. So in second gear 15-20 is normal.

Not sure what all of the numbers mean and I probably should have mentioned that it is an automatic. The mechanics that have actually driven my car have said that they feel the torque converter engaging way too early. One of the transmision specialist went as far as saying he thought this was happening because the computer needed to be re-calibrated or updated.

 

[toyman]

I think we all knew that it was an automatic with the reference to torque converter and the U4P0 PCM. My query was more directed to Mustangless for what the numbers were telling us.

 

[Mustangless]

I went back and edited my post. Does it make sense now?

 

[toyman]

I went back and edited my post. Does it make sense now?

Almost. While not stated it appears that the TP reference is volts. You did note that closed TP volts=.95ish. Since that is the minimum what do the zero values represent. In my case the reference is TP% but that is a calculated value from the TP volt range (min to max). But I do get the picture.

 

[Mustangless]

I don't know why there are zeros. I guess it is just areas not used. I think max on my car is around 4.75. TP is in volts too.