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Posted

I bought a 96 ls400. It was running rough and after inspection noticed that the capacitors were leaking and subsequently ate through the traces on the circuit board. Instead of trying to repair the board I ordered a new ecu that was supposed to be “ plug and play” after giving them my vin. After receiving the part the car would crank fine but no start. Sent it back and got another and same thing. Is there anything I can do so I don’t have to ship this one back and wait another 3 weeks? ( plugged the old ecu back in and car did start). Ordered from Flagship One ( if it matters)


Posted
1 hour ago, James Sharp said:

I bought a 96 ls400. It was running rough and after inspection noticed that the capacitors were leaking and subsequently ate through the traces on the circuit board. Instead of trying to repair the board I ordered a new ecu that was supposed to be “ plug and play” after giving them my vin. After receiving the part the car would crank fine but no start. Sent it back and got another and same thing. Is there anything I can do so I don’t have to ship this one back and wait another 3 weeks? ( plugged the old ecu back in and car did start). Ordered from Flagship One ( if it matters)

CoPilot reaction:

Quote

Here are a few steps you can take:

  1. Contact Flagship One Customer Service: Reach out to Flagship One directly and explain the situation. They might be able to expedite the process or provide additional troubleshooting steps. You can contact them via phone at (516) 766-2223 or email at [email protected].

  2. Check Compatibility: Ensure that the replacement ECU is fully compatible with your vehicle. Sometimes, even a VIN-specific part can have variations that affect functionality.

  3. Inspect the Installation: Double-check the installation process to make sure everything is connected properly. Sometimes, a small wiring issue can cause the ECU to malfunction.

  4. Consult a Professional: If you're comfortable with it, you might want to take the car to a professional mechanic or an auto-electrician. They can run diagnostics and ensure that the new ECU is functioning correctly.

  5. Consider Rebuilding the Old ECU: If the original ECU was working fine before the capacitors leaked, you might consider having it rebuilt with new capacitors. This can sometimes be a more reliable and cost-effective solution.

 

Posted

CoPilot reaction. Bizarre.

Could it be the immobiliser? If you've had the battery off and ECU out? The car is cranking but not firing.

If I had the battery off my old GS (can't remember with my old LS but same era) the car would have to sync to the key and if I remember rightly it could take up to 10 minutes with the key in and all ignition lights on before I turned it off and attempted a start. Try that. 

If no luck try posting on the UK forum. https://www.lexusownersclub.co.uk/forum/ 

Posted

Thank you for the reply. I have tried numerous things and heard different things about the 96 having an immobilizer or not but I haven’t tried that and will this evening. 

Posted

Leave it a good 10 minutes.

And if it works you can put up a picture or two of your '96. Loved mine.

IMG_20211030_133738024_HDR2.thumb.jpg.8e5d54fadced945cf0d5e89addb19f5b.jpg

  • Like 1
Posted (edited)

 I got a ECU from flagship for my 99 ls 400. and the car would not start. They sent a key that was suppose to start it, it didn't. I can't remember where I sent the key and ecu. I tried everything that was suggested, nothing worked.  The ecu and key came back in 2or3 day installed inserted key turn it. and it started up. Something to think about

  

Edited by Abe Scott
needed to add a space
Posted

Tried what you suggested but no luck but thanks for the info anyhow. I guess it’s back to the drawing board. Lol. This is my first Lexus so I’m completely new to all of this. After reading some other posts on different forums I’m thinking it is the immobilizer doing all this. I just need to find the proper way to reset it. Most of the shops near me won’t touch it because of its age. 

Posted

Thanks Abe. I spoke with Flgship and they stated that it didn’t have an immobilizer so no help there. I’m wondering if a locksmith could offer any help? Maybe be able to reprogram it ? As usual I will keep trying 

Posted
14 minutes ago, James Sharp said:

Thanks Abe. I spoke with Flgship and they stated that it didn’t have an immobilizer so no help there. I’m wondering if a locksmith could offer any help? Maybe be able to reprogram it ? As usual I will keep trying 

I've used an auto-locksmith before. They are expensive, but I now have a remote that works. Some Costco stores have one or two auto-locksmith company representatives. You may want to check with them if you are a Costco member.

  • Thanks 1
Posted
14 hours ago, rich1068 said:

CoPilot reaction. Bizarre.

Could it be the immobiliser? If you've had the battery off and ECU out? The car is cranking but not firing.

If I had the battery off my old GS (can't remember with my old LS but same era) the car would have to sync to the key and if I remember rightly it could take up to 10 minutes with the key in and all ignition lights on before I turned it off and attempted a start. Try that. 

If no luck try posting on the UK forum. https://www.lexusownersclub.co.uk/forum/ 

CoPilot is now part of Microsoft's Bing (and Office 365). It is an Artificial Intelligence program (like Chat GPT) that accepts questions about most topics. Answers are displayed in seconds. It is superior to the older Google and Bing in that it researches hundreds of sources to find relevant answers. Try it!

Posted

Thanks for the info from everyone. Guess im just going to have to send it back to Flagship again. Also I was able to get me a cheap code reader and got a p1600 code which from what I’ve researched it says ecu not getting power. Also I looked everywhere under the dash and can’t find an immobilizer box of any sort so it may be just the unit. We will see. Will post once I receive it again and let you know. 

  • Like 1
  • Thanks 1
Posted
On 1/1/2025 at 2:14 AM, RX400h said:

CoPilot is now part of Microsoft's Bing (and Office 365). It is an Artificial Intelligence program (like Chat GPT) that accepts questions about most topics. Answers are displayed in seconds. It is superior to the older Google and Bing in that it researches hundreds of sources to find relevant answers. Try it!

I'm aware of what CoPilot and all the other AI programs are. Just find it odd AI search engine responses are posted here as possible solutions when usually they are generic at best.

Posted
12 hours ago, rich1068 said:

I'm aware of what CoPilot and all the other AI programs are. Just find it odd AI search engine responses are posted here as possible solutions when usually they are generic at best.

Actually, the answers are generic only if your question is generic. By specifying the year, make, and model of the vehicle, CoPilot can more closely focus on answers tailored to that vehicle.

Posted

My lexus is a99 ls 400 the immoblizer is to the right of the ignition switch, almost in the radio space. I found it while installing a remote start.

  • 2 weeks later...
Posted
On 1/1/2025 at 3:20 PM, James Sharp said:

I was able to get me a cheap code reader and got a p1600 code which from what I’ve researched it says ecu not getting power. Also I looked everywhere under the dash and can’t find an immobilizer box of any sort so it may be just the unit.

With that code, it's a good idea to check all the fuses for your circuit. I do not have a manual for a 1996, as mine is the generation after (98+).

Look in both the interior and under-hood fuse boxes, and check all fuses labeled for ECM, Ignition, Engine, etc.

If any are blown, replace and see if they blow again. If so, there's little to do getting help tracing the short through a screen, and it'd be up to you or a qualified mechanic to do so.

If any aforementioned fuses are not getting power to them- check for a bad relay. If possible, swap the relay with another identical relay in the fuse box and see if the issue moves with the relay (swapping the ECM relay with the fuel pump relay, etc.) Also have someone turn the key on/off with a finger on the relay; if it is working properly, you will feel and hear a small click from it. If you have no click, but inputs to the relay are good, the relay is bad. ** It is important to know that the inverse is not true; if the relay does click, it isn't guaranteed to be good- you need to confirm that through other checks**

If the relay for your computer does not interchange with any others, you can check the inputs, which should be as follows: two pins will have positive 12 volts, near 0 ohms to battery positive. One pin will have a ground, near 0hms to battery negative, and one pin will be the output for the relay, which will have resistance to ground, and an open circuit to battery positive.

Posted

I can install the old ecu and car starts fine it just runs extremely bad. So ecu is the problem. I have ecu sent back and I am waiting for replacement. I am just trying to see if I can find something that I can try to keep from playing musical ecu’s. Lol. The company I bought it from says there is no immobilizer on this year but it seems strange that it starts and runs with old ecu but only cranks with new one. 

  • 4 weeks later...
Posted (edited)

I have the same issue.  Just had my ECU rebuilt and installed it this evening.  It will crank but not start.  The battery is brand new.  The immobilizer warning light is not lit up.  Any ideas?

Thanks,

James

 

Edited by colqhoun

Posted

I got a different ECU from flagship and the car started and ran just fine. They finally got it right after multiple tries so not sure what the actual problem was ( can’t get them to give me any answers) 

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