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Transmission slow response to throttle

Tiny
BLESSING EWOBOR
  • MEMBER
  • 2007 LEXUS ES 350
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 212,245 MILES
Hello, the vehicles transmission is not smart while accelerating as if some of the solenoid are not responding the way they supposed. I don't know if I can get the circuit diagram of the transmission. If I can measure resistance without removing the oil pan. No codes on it memory.
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Friday, September 17th, 2021 AT 8:10 PM

36 Replies

Tiny
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If I use that harness connector shown in the image, what would be the pinout?
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Friday, September 17th, 2021 AT 8:23 PM
Tiny
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  • MECHANIC
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Hi,

First, I attached the wiring schematic for the transmission circuit. I cut the pics in half to make them more readable. I did overlap them so you can follow from one to the next.

The connector you attached a picture of, what specifically is it for?

As far as tests, they really need to be done using a scan tool. I have diagnostics, but they are specific to codes.

Let me know what I can do to help.

Take care,

Joe

See pics below.
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Friday, September 17th, 2021 AT 10:37 PM
Tiny
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Thank very much.
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Saturday, September 18th, 2021 AT 1:01 AM
Tiny
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How can it be carried out using scan tool?
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Saturday, September 18th, 2021 AT 1:02 AM
Tiny
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  • MECHANIC
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Hi,

The diagnostics using a scanner are listed by diagnostic trouble codes. Let's narrow it down. Is it all gears that you experience the issues with or one specific shift? For example, the 2-3 shift.

Let me know.

Joe
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Saturday, September 18th, 2021 AT 8:03 PM
Tiny
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Good morning, that is one of the problems, how will I know the exact shift that has issue?
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Saturday, September 18th, 2021 AT 10:32 PM
Tiny
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Hi,

Are you able to feel it when it happens shifting?

Let me know.

Joe
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Sunday, September 19th, 2021 AT 5:56 PM
Tiny
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Yes, it can be felt while shifting.
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Monday, September 20th, 2021 AT 7:17 PM
Tiny
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But I felt that it can be shift manually if the solenoid are connected to a switch panel with the shift schedule known.
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Monday, September 20th, 2021 AT 7:21 PM
Tiny
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Do you feel it in all gears? Also, if you can control the solenoids, yes you can cause it to shift. You should be able to perform this with a scan tool that can communicate with the transmission circuits.

Joe
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Monday, September 20th, 2021 AT 8:41 PM
Tiny
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I was considering to shift it manually, I mean connecting switch to the transmission and controlling the shift manually while the vehicle is moving.
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Tuesday, September 21st, 2021 AT 7:13 PM
Tiny
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Hi,

See if that is something your scan tool will let you do. I don't see why it wouldn't work.

Let me know.

Joe
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Tuesday, September 21st, 2021 AT 7:33 PM
Tiny
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Okay, hope you are not angry with the stupid boy?
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Tuesday, September 21st, 2021 AT 7:59 PM
Tiny
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Hi,

Absolutely not. You are always welcome to ask me questions. There is no such thing as a bad question. I actually look forward to finding your questions. And in no way do I feel anyone is stupid. LOL I wish I could work with you. I would learn a lot.

You take care of yourself and feel free to ask any questions.

Take good care of yourself,

Joe
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Tuesday, September 21st, 2021 AT 8:28 PM
Tiny
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Good morning sir, most of the questions I am asking, the idea is to find a way of testing if the transmission itself is bad, that the problem is not electrical issue or hydraulic circuit problem. Using the connector show below, I am just trying to connect it to the transmission solenoid so that I can be activating them manually, shift the gear myself as the vehicle is moving if I can have the transmission shift schedule. That thing on the diagram below will be connected to the transmission and switch panel will be connected to it.
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Wednesday, September 22nd, 2021 AT 6:34 PM
Tiny
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Hi,

No problem. I attached below what I believe you need. If there is something different, let me know.

Take care of yourself,

Joe
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Wednesday, September 22nd, 2021 AT 7:34 PM
Tiny
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Get back you sir.
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Thursday, September 23rd, 2021 AT 3:06 AM
Tiny
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Hi,

I haven't heard from you for a couple of days. Have you been able to make any progress? I'm interested in knowing.

Joe
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Saturday, September 25th, 2021 AT 7:27 PM
Tiny
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Good morning sir, thank you for your concern. From the shift schedule, if the gear did not shift at particular vehicle speed that it supposed then there is a problem, for instance at 90km/hour, if the vehicle is still at fifth gear then something is wrong?
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Saturday, September 25th, 2021 AT 7:45 PM
Tiny
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For the second diagram with "check for shock and slip", when is transmission said to be slipped?
Is it failing to move to higher gear or when it moved to higher gear then back to lower gear then move again with the acceleration pedal still press?
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Saturday, September 25th, 2021 AT 7:53 PM

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