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Hello Guys ,
have flash my ecm tahoe 2001 , engine runs fine but the transmission 4L60E shift only up by very high rpm or stay in gear , what is wrong , have change gear ratio and tyre high ,still the same , mechanical gears work fine L3 L2 L1 , cables looking good from the trans
A 4L60e only shifts when instructed by the PCM; it cannot delay the shift due to RPM or anything else.
So this is definitely a problem with either the PCM reading the vehicles speed incorrectly (via the VSS) or the tune being set that way.
This is why Frank asked if the speedometer was reading incorrectly. If the speedometer reads 10 mph when you are driving 50 mph we know where to start looking. The tune does convert VSS signals into MPH for the speedometer and trans shifting.
A 4L60e only shifts when instructed by the PCM; it cannot delay the shift due to RPM or anything else.
So this is definitely a problem with either the PCM reading the vehicles speed incorrectly (via the VSS) or the tune being set that way.
This is why Frank asked if the speedometer was reading incorrectly. If the speedometer reads 10 mph when you are driving 50 mph we know where to start looking. The tune does convert VSS signals into MPH for the speedometer and trans shifting.
I am new with this , also the forum , but will learn it all
I hope give good response , the engine is put in ford f100 1956 , I also learning with hp tuners , I see now in the scanner screen when I drive with the laptop on the cable , no speed , it stays zero , TPS give good value , gears range switch good value , vcc sensor is wired to 20 and 21 on red but I see no wire to 50 on red , this must be dark green/white stripe 817 ,
Yes with no speed sensor signal it will not shift or will but at very high rpm. You can set up to shift by RPM and TPS but this is not the most desirable set up.
__________________ Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
OK , thanks , go check first the wiring , when I pull out the vcc sensor and let it wired , can I check it then when I move a magnet up and down it , can I see that then on the screen in hp tuners , think must see then the speed goes up
OK , thanks , go check first the wiring , when I pull out the vcc sensor and let it wired , can I check it then when I move a magnet up and down it , can I see that then on the screen in hp tuners , think must see then the speed goes up
You are clearly on the right path now. The VSS probably creates 4+ pulses per second for even 1 mph. So you'll need fast hands to get any reading in HP Tuners. The 4L60e/4L80e have an output shaft with a "gear" of about 24(?) teeth under the VSS. What kind of trans do you have in your custom car?
My englisch is not so good , I am from the netherlands , but try to do it good .
I mean , with the hand is not fast enough like you say , when I take a old gearwheel , and put it in a drilling machine , and let turn around by the sensor , looks me the same
have the speedometer working now , purple/white wire from vcc sensor was bad , still not shifting up
next question , what is the difference between the throttle position sensor and the other with (SAE) writing by ,
only one give value when step one the gas , the other stays at zero
have the speedometer working now , purple/white wire from vcc sensor was bad , still not shifting up
...
next question , what is the difference between the throttle position sensor and the other with (SAE) writing by ,
only one give value when step one the gas , the other stays at zero
To confirm, you have seen or logged "Vehicle Speed" in HP Tuners when the car is moving? You pictures don't show any speed.
While I have used HP Tuners a lot, I have also noticed that some of the "Thottle position" values stay at Zero while "Throttle Position SAE" does change. I don't know, you could ask on their forum, but I simply never examine or log these unused values (called PIDs).
Looking at you pics, I though your idle Advance is very low at 8 degrees and might lead to surging if the next cell value is much higher. Also, at just 1450 RPM, your advance of 40.5 degrees is very high; might not hurt, just strangely high.
the speed is zero becauae car is standing in park , speedometer works , the pics are to see for all the values , tps stays at zero , tps sae give a value , I look futher
thanks
Wonder if he ever solved this , I hate when people never follow up.
I was just in Germany last week. Maybe I should have gone to see him and twisted his arm to give us a followup. Hmmm, he might have forced me to fix it.
i was just in germany last week. Maybe i should have gone to see him and twisted his arm to give us a followup. Hmmm, he might have forced me to fix it.
lol lol
__________________ Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
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4l60e shift only by high rpm 
