Notices
SC - 1st Gen (1992-2000)

ECU Replacement Procedure

Thread Tools
 
Search this Thread
 
Old May 9, 2024 | 05:48 AM
  #1  
tonythe93sc400's Avatar
tonythe93sc400
Thread Starter
Rookie
 
Joined: Jul 2023
Posts: 29
Likes: 0
From: Alabama
Default ECU Replacement Procedure

Anyone know if there's a specific new ECU program procedure I have to follow for a 95? Just replaced the ECU on mine because of bad capacitors and replaced it with a "tested" unit, but I'm getting no CEL when key is IG ON and no start, just cranking.
Is there a specific procedure other than making sure the battery is disconnected?
Reply
Old May 10, 2024 | 03:44 AM
  #2  
t2d2's Avatar
t2d2
Lead Lap
10 Year Member
Liked
Loved
Community Favorite
iTrader: (8)
 
Joined: Apr 2014
Posts: 4,770
Likes: 273
Default

Tested by who? Sounds like either a defective or mismatched ECU. (Or some pins didn't seat properly when disconnecting and reconnecting.)

Nothing needs to be done ... just plug in the new ECU and give it a little time to learn your driving habits (not that I've ever noticed its behavior change).
Reply
Old May 10, 2024 | 06:18 AM
  #3  
tonythe93sc400's Avatar
tonythe93sc400
Thread Starter
Rookie
 
Joined: Jul 2023
Posts: 29
Likes: 0
From: Alabama
Default

Originally Posted by t2d2
Tested by who? Sounds like either a defective or mismatched ECU. (Or some pins didn't seat properly when disconnecting and reconnecting.)

Nothing needs to be done ... just plug in the new ECU and give it a little time to learn your driving habits (not that I've ever noticed its behavior change).
Supposedly, the seller.
I'm going to return it because it doesn't work.
So the only thing I should have to do is plug it in with battery off, then reconnect?
If that's the only thing, then it definitely doesn't work.
Btw it is the exact same part no. and version.
Reply
Old May 10, 2024 | 07:15 AM
  #4  
t2d2's Avatar
t2d2
Lead Lap
10 Year Member
Liked
Loved
Community Favorite
iTrader: (8)
 
Joined: Apr 2014
Posts: 4,770
Likes: 273
Default

Originally Posted by tonythe93sc400
So the only thing I should have to do is plug it in with battery off, then reconnect?
Correct.

Btw it is the exact same part no. and version.
With 25-30 year old used parts, you never know for sure that what you're looking at is what it appears to be... Someone could have swapped ECU cases while servicing a bunch of them, for example.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
t0ekn3e
GS - 2nd Gen (1998-2005)
10
Jul 22, 2025 09:04 PM
snydertalo
RX - 2nd Gen (2004-2009)
0
Jul 26, 2023 01:46 PM
aalimi
GS - 3rd Gen (2006-2011)
2
Apr 23, 2023 07:04 PM
Cavedog
SC430 - 2nd Gen (2001-2010)
4
Jun 1, 2022 11:50 AM
sdbrow6
RX - 1st Gen (1999-2003)
15
Feb 10, 2022 09:26 AM




All times are GMT -7. The time now is 05:18 PM.

story-0
2026 Lexus IS 350 F Sport Review: The Last of Its Kind Still Rocks

Slideshow: the 2026 IS 350 isn't all that new, and that's why we love it!

By Michael S. Palmer | 2026-06-04 14:35:23


VIEW MORE
story-1
Top 10 Most Confusing Things Lexus Has Ever Done!

Slideshow: 10 most confusing things Lexus has ever done.

By Joe Kucinski | 2026-06-04 09:40:55


VIEW MORE
story-2
2026 Lexus ES Review: Lexus Re-Embraces Founding Principles

Slideshow: Our First-Drive Review of the 2026 Lexus ES!

By Michael S. Palmer | 2026-05-29 20:30:16


VIEW MORE
story-3
10 Lexus Bargains That are Cheaper Than a New Toyota RAV4

Slideshow: 10 Lexus bargain that are cheaper than a new Toyota.

By Joe Kucinski | 2026-05-20 10:28:20


VIEW MORE
story-4
8 Weirdest Things Lexus Has Ever Built

Slideshow: From hoverboards to luxury yachts, these are the strangest projects Lexus has ever attached its badge to.

By Verdad Gallardo | 2026-05-16 11:34:36


VIEW MORE
story-5
10 Lexus Designs That Have Aged Like Fine Wine

Slideshow: Some luxury cars chase trends, but these Lexus models look better now than they did when they first rolled into showrooms.

By Verdad Gallardo | 2026-05-06 17:58:29


VIEW MORE
story-6
8 Tips for Improving Your Hybrid or Plug-in Hybrid's Efficiency!

Slideshow: How to Get the Best Fuel Economy with a Hybrid and Plug-In Hybrid!

By Michael S. Palmer | 2026-05-05 20:54:44


VIEW MORE
story-7
10 Best Lexus Models No One Remembers

Slideshow: 10 best Lexus models no one remembers.

By Joe Kucinski | 2026-05-05 17:33:28


VIEW MORE
story-8
TRD Off-Road Premium: Best 2026 4Runner, Except This One Thing

Slideshow: diving into 4Runner TRD Off-Road Premium's pricing, performance, fuel economy, features, and amenities!

By Michael S. Palmer | 2026-04-23 13:09:18


VIEW MORE
story-9
Top 10 Lexus & Toyotas to Drive Before You Die!

Slideshow: the 10 Lexus and Toyota vehicles you need to drive before you die.

By Joe Kucinski | 2026-04-23 10:34:24


VIEW MORE