ISF steering ECU Mod
02-04-23 | 03:35 PM
#31
Rookie
Joined: Dec 2022
Posts: 48
Likes: 12
From: Ontario
Follow up with regard to installing the IS F steering ECU (Part# 89650-53042).in IS 250/350. Can a new unit be installed then be driven without issue to dealer to calibrate? Once at the dealership, is there anything specific the service manger would need to know, or just state that a new steering ECU was installed and would like a calibration performed (or don't mention I installed it for fear of them not wanting to do it, and just state you want the steering ECU recalibrated as "preventive maintenance"? What would the calibration service cost? It would be great if there was a list of known members with Toyota Tec stream experience in a given region of the country, who may be able to assist, if unable to bring to a dealership!
I also have techstream but not sure how to go about the process.
02-04-23 | 04:04 PM
#32
Instructor
Joined: Feb 2017
Posts: 1,211
Likes: 316
From: Ontario
02-05-23 | 05:34 AM
#34
Instructor
Joined: Dec 2019
Posts: 790
Likes: 118
From: State
Thank you primavera for adding the link; My thoughts on installing an ISF Steering ECU https://www.clublexus.com/forums/is-...ering-ecu.html
The following replies from that link were helpful (please see replies further below)
I also came across the following link;
2012 Steering ECU Retrofit (2010 F) - CL Member removed ECU from 2010 IS F (part 89650-53040) and installed part 89650-53041 (2011 - 2012 IS F);
https://www.clublexus.com/forums/is-...it-2010-f.html
Installation: This was pretty straightforward and the easiest part of a rather stress-free process. It involves removing the battery and battery tray, which reveals the steering ECU just beneath it (images below). You then have three bolts and three connectors to remove, before pulling the ECU and reversing the process to install the new one. No additional parts or any modifications were necessary.
Calibration: I purchased mine new, so it didn't provide any assist out of the box. It's possible other steering functions could be affected, so for this very reason I'd highly recommend doing this at your dealer or somewhere you can get access to a Techstream and/or a person who knows what they're doing. I happened to be at my dealership with one of the awesome techs willing to volunteer his time. He plugged in the laptop and had to clear a few aspects of the cars memory, before going through a process detailed in the software. This involved an illumination of the steering dash-light (which was normal), some manual 90 degree turns and centering of the wheel, a period of steering "vibration" (wheel turns itself under computer control), and a nice confirmation to signal all went well. It really is a simple step-by-step process where you read instructions and just hit "next".
Replies from My thoughts on installing an ISF Steering ECU;
Reply #37 - Got my ECU a couple days ago and installed it but couldn't get Techstream to initialize it so I have an appointment in one week at the stealership. Can't wait to get it in and running.
Reply # 40 - 2 things: 1) Since you are installing the new ecu, you will have codes, something like these: C1515 Torque Sensor Zero Point Adjustment Undone & C1525 Rotation Angle Sensor Initialization Undone. You must clear all the codes before you can able to program the ecu which is the EMPS submenu. 2) Your VCI knock off cable might not have enough juice to program the ECU, you might see initialization and connection lost messages. In this case, just get the real deal cable or bring your car to the dealer.
Reply # 63 - So tomorrow I have a 2011 ISF Steering ECU coming in (part number 89650-53041), but my local Lexus dealer doesn't want to calibrate it because its a non OE part. I don't have Techstream and I don't have the proper cable. @Yamehoo , can you help me with this? I'm going to be in Socal next week, arriving on Wednesday. If you have some time, either next Thursday or Friday I can swing by. Let me know if that is OK with you
Reply # 69 - The service manager actually got back to me last night by email and they will do it...for $434! He said no warranty, if for some reason it doesn't work I will still owe the money. For a 10 minute job. I think that's their way of saying we don't want the liability. I don't think all dealerships follow this path, as I've heard a few members had it done at a Toyota dealership for $150. Anyway if you can find a used one I would go that path, but 2011 and on are hard to find used
Reply #76 - Side note, I heard back from a local Lexus dealership (still waiting for Toyota's response):Good morning, as you might already be aware, the power steering ECU and steering gear assembly work in conjunction with each other. This is indeed an unusual request and it might simply not work. As long as you are aware that we are willing to try and initialize the torque and angle sensors for you, providing you sign off on liability and warranty issues that might arise from the work. We will try to accommodate your request and let you know if the computer allows for the combination or not. Hope this helps. Regards, Shop Foreman
Reply # 99 - Calibrating the new EPS ECU with Tech Stream - https://photos.google.com/share/AF1Q...BSd2Y3YXhiSnRB
Reply # 118 - All of them are compatible (convertible may not be ??). If used, no calibration needed, if new, calibration is needed @ the dealer or w/ somebody who has a legit copy of techstream.
The following replies from that link were helpful (please see replies further below)
I also came across the following link;
2012 Steering ECU Retrofit (2010 F) - CL Member removed ECU from 2010 IS F (part 89650-53040) and installed part 89650-53041 (2011 - 2012 IS F);
https://www.clublexus.com/forums/is-...it-2010-f.html
Installation: This was pretty straightforward and the easiest part of a rather stress-free process. It involves removing the battery and battery tray, which reveals the steering ECU just beneath it (images below). You then have three bolts and three connectors to remove, before pulling the ECU and reversing the process to install the new one. No additional parts or any modifications were necessary.
Calibration: I purchased mine new, so it didn't provide any assist out of the box. It's possible other steering functions could be affected, so for this very reason I'd highly recommend doing this at your dealer or somewhere you can get access to a Techstream and/or a person who knows what they're doing. I happened to be at my dealership with one of the awesome techs willing to volunteer his time. He plugged in the laptop and had to clear a few aspects of the cars memory, before going through a process detailed in the software. This involved an illumination of the steering dash-light (which was normal), some manual 90 degree turns and centering of the wheel, a period of steering "vibration" (wheel turns itself under computer control), and a nice confirmation to signal all went well. It really is a simple step-by-step process where you read instructions and just hit "next".
Replies from My thoughts on installing an ISF Steering ECU;
Reply #37 - Got my ECU a couple days ago and installed it but couldn't get Techstream to initialize it so I have an appointment in one week at the stealership. Can't wait to get it in and running.
Reply # 40 - 2 things: 1) Since you are installing the new ecu, you will have codes, something like these: C1515 Torque Sensor Zero Point Adjustment Undone & C1525 Rotation Angle Sensor Initialization Undone. You must clear all the codes before you can able to program the ecu which is the EMPS submenu. 2) Your VCI knock off cable might not have enough juice to program the ECU, you might see initialization and connection lost messages. In this case, just get the real deal cable or bring your car to the dealer.
Reply # 63 - So tomorrow I have a 2011 ISF Steering ECU coming in (part number 89650-53041), but my local Lexus dealer doesn't want to calibrate it because its a non OE part. I don't have Techstream and I don't have the proper cable. @Yamehoo , can you help me with this? I'm going to be in Socal next week, arriving on Wednesday. If you have some time, either next Thursday or Friday I can swing by. Let me know if that is OK with you
Reply # 69 - The service manager actually got back to me last night by email and they will do it...for $434! He said no warranty, if for some reason it doesn't work I will still owe the money. For a 10 minute job. I think that's their way of saying we don't want the liability. I don't think all dealerships follow this path, as I've heard a few members had it done at a Toyota dealership for $150. Anyway if you can find a used one I would go that path, but 2011 and on are hard to find used
Reply #76 - Side note, I heard back from a local Lexus dealership (still waiting for Toyota's response):Good morning, as you might already be aware, the power steering ECU and steering gear assembly work in conjunction with each other. This is indeed an unusual request and it might simply not work. As long as you are aware that we are willing to try and initialize the torque and angle sensors for you, providing you sign off on liability and warranty issues that might arise from the work. We will try to accommodate your request and let you know if the computer allows for the combination or not. Hope this helps. Regards, Shop Foreman
Reply # 99 - Calibrating the new EPS ECU with Tech Stream - https://photos.google.com/share/AF1Q...BSd2Y3YXhiSnRB
Reply # 118 - All of them are compatible (convertible may not be ??). If used, no calibration needed, if new, calibration is needed @ the dealer or w/ somebody who has a legit copy of techstream.
Last edited by ELexis; 02-05-23 at 06:48 AM.
09-02-23 | 08:08 AM
#35
Instructor
Joined: Dec 2019
Posts: 790
Likes: 118
From: State
I understand pricing will fluctuate from region to region however, what would be approximate pricing for the Dealership to perform the recalibration of the NEW ECU after installing, as well as approximate time to for the Dealership to complete the process (once the service itself begins)?
09-02-23 | 08:20 AM
#36
Pit Crew
Joined: Oct 2015
Posts: 232
Likes: 19
From: California
I understand pricing will fluctuate from region to region however, what would be approximate pricing for the Dealership to perform the recalibration of the NEW ECU after installing, as well as approximate time to for the Dealership to complete the process (once the service itself begins)?
09-02-23 | 08:45 AM
#37
Instructor
Joined: Dec 2019
Posts: 790
Likes: 118
From: State
Thank you. Did you make the Dealership aware that you had installed the ECU and just needed it to be recalibrated,and it was performed with no additional questions etc.?
09-02-23 | 04:20 PM
#38
Pit Crew
Joined: Oct 2015
Posts: 232
Likes: 19
From: California
yes, and I paid $145 for them to do it. This was many years ago. At first the service people didn’t know what I was referring to. But then they went back inside and talked to some specialist there and he came out and knew what I was talking about and did it right then and there in a few minutes.
09-03-23 | 09:02 AM
#39
Instructor
Joined: Dec 2019
Posts: 790
Likes: 118
From: State
yes, and I paid $145 for them to do it. This was many years ago. At first the service people didn’t know what I was referring to. But then they went back inside and talked to some specialist there and he came out and knew what I was talking about and did it right then and there in a few minutes.
ISF steering ECU Mod (unsure if newer TechStream software version exists than what was used in the videos shown. So I assume process may vary);
Reply # 99 - Calibrating the new EPS ECU with Tech Stream - https://photos.google.com/share/AF1Q...BSd2Y3YXhiSnRB
Toyota/Lexus Electric Power Steering (EMPS) - Torque Sensor Adjustment (Type 4)
https://www.youtube.com/watch?v=F0Ob...t%20(Type%204)
Procedure shown;
- USB cable from TechStream Computer to OMD port on vehicle. The Initializing USB Computer Drive screen appears
- Check for updates pop up appears (Update Now, Update Later, Cancel). If Cancel is selected, the vehicle diagram screen is shown
- Select/Press Connect to vehicle selection n left
- The Vehicle Connection Wizard pop up is displayed (Connecting to vehicle Please Wait...)If NOTE: REDUCED FUNCTIONALITY pop up appears, Select/Presss offline mode
- Then the Confirm the Vehicle Information / and PRESS NEXT pop up appears
- Enter the vehicle information (Division - Lexus) / Model - IS250/IS350 etc. / Model Year **** / Engine (2GR-FSE etc.) / Options - Others) then Select/Press Next (the Please Wait..... Pop up appears)
- The System Selection Menu screen will then appears when the Please wait...ends.
- Select/Press the Chassis tab (Tabs shown - All ECUs / Powertrain / Chassis / Body Electrical
- Then Select/Press the EMPS (Electronic Power Steering) column cell on right, then click the ARROW located at bottom right of screen. After clicking, Please wait..... is displayed
- The Diagnostics Code screen is then shown (C1515 Torque Sensor Zero Point Adjustment Undune / C1525 Rotation Angle Sensor Initialization Undone). Thes codes will need to be cleared prior to continuing the calibration process. To do so, click on the Engine Icon at bottom left. The DTC Clear Pop up will appear (clearing DTC's will also erase the following diagnostic information from the ECU if available: Freeze Frame Data / Monitor Status and Results. Would you like to store this data before clearing? [NOTE: If the ECU controls multiple systems EG Engine & Cruise Control] diagnostic information in the other systems will also be cleared). Select Clear then click OK.
- The Parameter screen will be shown. I was unable to confirm the next few steps prior to receiving the Welcome to the Torque Sensor Adjustment wizard Pop-Up (This function is used to center the steering wheel if: the EPS ECU has been replaced / The steering gear assembly has been replaced There is a difference in turning force when turning right or left) Press Next to proceed.
- The Utility Selection Menu is displayed (Confirm the following conditions: -Vehicle is stopped / IG switch is ON / In case of HV, IG switch is READY ON). Press Next to proceed
Pop-Up now shows: Turn IG switch OFF and ON / In case of HV, turn IG switch READY OFFand READY ON). Press Next to proceed
Pop-Up now shows: Confirm the PS warning light is ON. PS light is located in the RPM display). Press Next to proceed
Pop-Up now shows: Perform the following operations then press Next; 1. Set the steering wheel to the center position. 2. Turn the steering wheel another direction 90 degrees or more. 3. Turn the steering wheel back to the center position. 4. Turn the steering wheel the opposite direction 90 degrees or more. 5. Turn the steering wheel back to the center position. Click Next
Pop-Up now shows: NOW CALIBRATING, Time Remaining......40 seconds....
Pop-Up now shows: Confirm the steering wheel is centered (Note- During the next step, the steering wheel will vibrate. Do not touch the wheel while it is vibrating). Click Next to proceed
- After steering while stops vibrating, NOW CALIBRATING, Time Remaining......will be shown.
- Torque Sensor Adjustment is Complete is displayed after calibration has completed.
PHOTO from Toyota/Lexus Electric Power Steering (EMPS) - Torque Sensor Adjustment (Type 4)
https://www.youtube.com/watch?v=F0Ob...t%20(Type%204)
Last edited by ELexis; 09-03-23 at 09:05 AM.
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