Torque converter engages too early

2

22catch22

New Member

Aug 26, 2008

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Oct 2, 2008

#1

• Oct 2, 2008

• #1

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

Member

Jun 27, 2003

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Oct 3, 2008

#2

• Oct 3, 2008

• #2

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

10 Year Member

Jul 19, 2007

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Vernon BC

Oct 3, 2008

#3

• Oct 3, 2008

• #3

Mustangless said:

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.

Click to expand...

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

 

2

22catch22

New Member

Aug 26, 2008

12

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Oct 3, 2008

#4

• Oct 3, 2008

• #4

Mustangless said:

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.

Click to expand...

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

10 Year Member

Jul 19, 2007

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Vernon BC

Oct 4, 2008

#5

• Oct 4, 2008

• #5

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

Member

Jun 27, 2003

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Oct 4, 2008

#6

• Oct 4, 2008

• #6

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

 

toyman

10 Year Member

Jul 19, 2007

1,944

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Vernon BC

Oct 4, 2008

#7

• Oct 4, 2008

• #7

Mustangless said:

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

Click to expand...

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

Member

Jun 27, 2003

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Oct 4, 2008

#8

• Oct 4, 2008

• #8

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.