ls 430 jerking on downshift 3-2&2-1
#1
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ls 430 jerking on downshift 3-2&2-1
ls 430 2004 model gulf spec vehicle has developed a jerky and shaky downshift(3-2&2-1).
many technicians tell me this is because of a faulty ecu
i have only one option of getting an old ecu since new ecu is too expensive.
but the challenge here is i get a japan right hand drive vehicle's ecu ,of the same model but my technicians say we need to do some remapping of the used ecu to suit my car & to do this they are gonna charge me high.
please can anyone out there help me with this issue.
many technicians tell me this is because of a faulty ecu
i have only one option of getting an old ecu since new ecu is too expensive.
but the challenge here is i get a japan right hand drive vehicle's ecu ,of the same model but my technicians say we need to do some remapping of the used ecu to suit my car & to do this they are gonna charge me high.
please can anyone out there help me with this issue.
Last edited by jubin; 07-23-17 at 11:34 PM.
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Can you expand a little on the common problem with 2004 rough transmission shifts? I have owned my LS430 for about a month now with 94k miles and noticed the transmission upshifts roughly at times or stays in gear a bit longer and results in a jerky acceleration when applying light throttle. Hoping this can be resolved with a ECU flash (and eventually a trans fluid change).
Thank you!
#4
Lexus Fanatic
Hi Tallguy,
Can you expand a little on the common problem with 2004 rough transmission shifts? I have owned my LS430 for about a month now with 94k miles and noticed the transmission upshifts roughly at times or stays in gear a bit longer and results in a jerky acceleration when applying light throttle. Hoping this can be resolved with a ECU flash (and eventually a trans fluid change).
Thank you!
Can you expand a little on the common problem with 2004 rough transmission shifts? I have owned my LS430 for about a month now with 94k miles and noticed the transmission upshifts roughly at times or stays in gear a bit longer and results in a jerky acceleration when applying light throttle. Hoping this can be resolved with a ECU flash (and eventually a trans fluid change).
Thank you!
#6
My indy did the reflash for 100. The combo of reflash and multiple D/F's solved the problem. Now smooth.
#7
I've owned my car since 81k, and it's now near 95k and had 3 drain/fills........I think there is a certain light acceleration scenario where the car decides not to stay in 3rd and goes back to 2nd. I've always assumed that's just the car, meaning although it's not underpowered, it still has to follow some algorithm when shifting, and pressing lightly on the throttle causes the above imho (as if it wanted to get into 3rd earlier than later, but now the rpms were not advancing as it had thought and needs to go back to 2nd)....meaning stepping on hit harder, the above shift doesn't happen, just continues on....my .02
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#8
Lexus Fanatic
I'm thinking a car is a car (this vehicle has plenty of torque at x rpm), meaning, if you press the gas too lightly and suddenly you're heading uphill, without more gas applied, the vehicle needs to go into a lower gear...this is why I'd rather just have a clutch and not let the vehicle decide....
#9
I'm thinking a car is a car (this vehicle has plenty of torque at x rpm), meaning, if you press the gas too lightly and suddenly you're heading uphill, without more gas applied, the vehicle needs to go into a lower gear...this is why I'd rather just have a clutch and not let the vehicle decide....
#10
Lexus Champion
Lexus knew that their intended customers would not be interested in stick shift. That is why it was not even offered (much less considered) as an option. Those that want otherwise now should look at other cars.
#11
Lexus Fanatic
If there's still a place you can go and see vehicles with clutches, it would likely be third world countries, and Europe too.
#12
Instructor
iTrader: (37)
ls 430 2004 model gulf spec vehicle has developed a jerky and shaky downshift(3-2&2-1).
many technicians tell me this is because of a faulty ecu
i have only one option of getting an old ecu since new ecu is too expensive.
but the challenge here is i get a japan right hand drive vehicle's ecu ,of the same model but my technicians say we need to do some remapping of the used ecu to suit my car & to do this they are gonna charge me high.
please can anyone out there help me with this issue.
many technicians tell me this is because of a faulty ecu
i have only one option of getting an old ecu since new ecu is too expensive.
but the challenge here is i get a japan right hand drive vehicle's ecu ,of the same model but my technicians say we need to do some remapping of the used ecu to suit my car & to do this they are gonna charge me high.
please can anyone out there help me with this issue.
There's a tsb for it. TC 006-04. You can try that first. I took mines to the dealer to do the tsb, but same problem. Then they said to change the ecu. I paid $1800 for a new ecu. Now it's running normal now.
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