Last x Days Posts  1 | 3 | 7 Days  Search  Topics  Tree View  Help
  Soarer Central * Mechanical - V8 * Toyota - Lexus ECU compatibility Previous Previous    Next Next  

Author Message
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 6
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Saturday, October 11, 2014 - 08:20 am, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hello all,

My Toyota Soarer is running rough. Recently decided to change the spark plugs as the seller claimed that this would fix the rough running. As I was pulling out the old plugs I found that the plugs of the centre 4 cilinders (3,4,5&6) were completely black. I thought this was strange but put the new plugs in anyway.

With the new plugs I'm still experiencing nasty misfire's. I hooked up a oscilloscope to check the injector signal's. And I've found that the centre 4 injectors get 2 signals. So they are opened twice instead of once. Resulting in a way too rich mixture in those cilinder's, resulting in misfire's.

A little bit of research led me to believe my ECU might be faulty. We hooked up the oscilloscope to the ECU internals to see where it's going wrong. (Risky I know). The transistor signals from the driver chip (transistor array chip) seem to be in order. But somewhere in the end stage powertransistors for the injectors, the signals of two injector groups get combined.

I'm now looking for a replacement ECU (pn. 89661-24220) but I can't seem to find one ANYwhere.

I just found a SC400 unit from 1996 (pn. 89661-24453) and I'm wondering if this will work.

http://www.ebay.com/itm/96-Lexus-SC400-1UZFE-V8-ECU-ECM-PCM-Engine-Computer-Control-Unit-89661-24453 -C-/360986014695?pt=Motors_Car_Truck_Parts_Accessories&hash=item540c7173e7&vxp=mtr

Cheers, Mees
Jamie Richards
TryHard
St.john's
v8

Posts: 226
Reg: 06-2009

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Saturday, October 11, 2014 - 10:02 am, by:  Jamie Richards (Nwb40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hey i had the same mis-fire,same set of plugs were running rich, i got one from a sc400 ECU #89661-24240 about 5 months ago working good so far
Rob Charles
Tinkerer
Victoria
V8 UZZ31

Posts: 100
Reg: 07-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Saturday, October 11, 2014 - 12:06 pm, by:  Rob Charles (Pearl_white) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

This might be interesting~

http://ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

Also, if you need an ECU fixed (recapped) - give this guy a call. He will do it for $75.
A friend had his done a few months ago and his car came back to life. No issues so far.

Daniel Blackham - Import Nation.
Sales Manager
Mob: 0423 296 014

(Based in vic, but I'm sure he could post...)
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 7
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 12:26 am, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Jamie thanks a million! Finally some new found hope on this issue!

Is there something I should consider or look out for, given the fact that my Soarer is a Japan import. Will a US spec ECU work no problem?

Thanks Rob. They were indeed covered in dry carbon.


Upload




We did already replace the capacitors. (Not all of them, only the faulty ones.)
Jamie Richards
TryHard
St.john's
v8

Posts: 227
Reg: 06-2009

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 12:47 am, by:  Jamie Richards (Nwb40gt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

My car is jap-import as well, i got the ECU plugged right up pulled the main fuse gave it some time to reset and she fired right up. The only thing i notice with my car now is that its not as aggressive as it use to, the power is there but comes in a lot smoother now, which i believe is because the Lexus would have a smoother power curve because its all about luxury. But other than engine still runs great
Tom Richards
Goo Roo
nsw
V8

Posts: 1975
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 07:18 am, by:  Tom Richards (Tomr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

how do you know the faulty caps???.

After 20yrs, all the electros should be replaced.

Just because you cannot see leakage, does not mean they are ok!
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 8
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 08:52 am, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Tom we measured the removed caps with a Phillips PM6303 RCL meter. And the capacitors we didn't remove in fear of damaging the multilayer printboard we tested with the capacity function of a multimeter.

Tomorrow we're gonna hook up the oscilloscope again. To make sure we're not missing anything. At the end of the day this stuff is my dads profession. And he can't comprehend why we haven't figured it out yet .

If we're still drawing a blank tomorrow I'll be ordering a replacement ECU.
Rob Charles
TryHard
Victoria
V8 UZZ31

Posts: 107
Reg: 07-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 12:39 pm, by:  Rob Charles (Pearl_white) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Mees, a sign of a bad ECU is also that it overfuels and causes misfires on certain cylinders - and your plugs die.

I highly suggest replacing ECU capacitors regardless if it checks out 'ok'.

The ECU's in these cars (the caps) break as they get old. Caps burst and leak over the board. Caps might also not have any evidence of failure.
"This is an age and standing up issue - A junkyard ECU won't fix it".

You should seriously consider getting the ECU recapped by the person i mentioned above (or walk in to any electrical tv repair shop...)

Most ECU's break after around 12 or so years.
All Soarers are over 12 years old now.

If somebody works on your ECU and breaks it - They will replace the part for you via warranty, if they work in a shop or what not.

The other thing which I read the other week was that If you have alternator issues with the soarer, plugs can foul, and cats can glow.

At $75 for a full ecu repair, you should consider it before you go spending hundreds on something you don't need.

Remember - a junkyard ECU is going to be ruined also due to age. So either recap your current one, or buy a junkyard ecu and recap that instead. This way at least you have your current ECU to fall back on :-)

Good luck!
Tom Richards
Goo Roo
nsw
V8

Posts: 1976
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 03:08 pm, by:  Tom Richards (Tomr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

not a 100% test what you have done.( you are not testing any change due to temp, and not under voltage. I am not sure if your device checks leakage or only capacitance)

You will find "really stuffed" caps but not the "I am working at below 100%" ones.
Matthew Salkeld
TryHard
South Australia
1JZ powered 180sx

Posts: 248
Reg: 07-2008

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 04:15 pm, by:  Matthew Salkeld (Munkymatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I don't think there are any caps on the injector output channels anyway; there's a real gung-ho attitude on soarercentral which declares that any problem that might be related to the ECU is caused by bad caps... I think any competent electronics repairer will be able to figure it out.

Many of the injector related problems I've read about concerning soarers come back to degraded wiring and shorts of that nature, so it might pay to look past the ECU (unless you've isolated the problem to the ECU already).
Matthew Salkeld
TryHard
South Australia
1JZ powered 180sx

Posts: 249
Reg: 07-2008

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 04:16 pm, by:  Matthew Salkeld (Munkymatt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Also, that cap meter he's using will indeed show "not 100% ones", as you put it.
Tom Richards
Goo Roo
nsw
V8

Posts: 1977
Reg: 08-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Sunday, October 12, 2014 - 07:38 pm, by:  Tom Richards (Tomr) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

matthew , i do doubt what you saying regarding the accuracy of the meter.

I worked for PHILIPS semiconductors for 9 yrs
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 9
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, October 13, 2014 - 05:28 am, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Well today was a bit of a bust. We took de ECU apart again to replace all remaining caps. We also extensively checked the injector wiring. No anomalies could be found (with a multimeter). We also tested the injector groups by manually connecting the female ECU pins to ground and listening with a stethoscope. I'm now sure the wiring is not the issue.

When we then put the ECU back in and tried to start the car again the battery died. So grabbed another one and got the car started.
The misfire problem is still there, no change. However we managed to screw up the ecu connectors of the car with the measurements. So when I rotated the ecu to hook up the oscilloscope the car started running even worse. Eventually stalling.

So now we have two problems

I just contacted another forum member about a refurbished ECU.

And I'll be replacing the bad ECU connector (female) pins this week.
Dave Rose
Goo Roo
wa
UZZ31 / ML320 CDI

Posts: 2539
Reg: 03-2007

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Monday, October 13, 2014 - 10:28 am, by:  Dave Rose (Sand_groper) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Sounds as though the car is in cold startup mode ?
extra signals to rich up mixture , could be a sensor problem ,
Jamie, the US one would be sequential injection same as 96-97 JP ones ,should be better on fuel.
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 10
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, October 14, 2014 - 03:27 am, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Dave if that's true, would it enrich the mixture on 4 cylinders only?

Also, the engine starts running rough immediately after cold startup.
Dave Rose
Goo Roo
wa
UZZ31 / ML320 CDI

Posts: 2542
Reg: 03-2007

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, October 14, 2014 - 06:39 pm, by:  Dave Rose (Sand_groper) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

That could be the sensor is saying the engine is cold when its warmed up ,permanently on full start up mode have a search (cold start injectors)
http://soarercentral.com/sc-forum/messages/282/2340.html
Phil Harbrow
Tinkerer
NSW
UZZ30, UZZ31, LS400 & IS300

Posts: 70
Reg: 07-2005

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Tuesday, November 11, 2014 - 09:51 am, by:  Phil Harbrow (Gt_v8_4l) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I have had my UZZ30 firing on only four cylinders and using copious amounts of fuel.

The problem, I had blown a coil by leaving the ignition on for three hours charging my mobile phone. I now have plenty of spare coils.
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 11
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Friday, November 14, 2014 - 09:03 pm, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I finally got my ECU back! The mighty v8 is finally running as it should now! Major happy.

Had it repaired by Darryl Geller in Georgia (eBay id: roadrunner4444)
http://www.ebay.com/usr/roadrunner4444

It was a bit of a wait but that's not a surprise as I live in the netherlands. It was definitely worth it however.
I did end up putting the old sparkplugs back in as with the new plugs the engine was still not running completely as it should. Turned out the sparkplugs I bought were not the right ones.

Thanks everybody for you're help!
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 12734
Reg: 11-2004

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Saturday, November 15, 2014 - 01:13 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Glad you had a win, it's a good feeling when they run well. :-)
Mees Godwaldt
Tinkerer
Utrecht
V8

Posts: 12
Reg: 10-2014

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Saturday, November 15, 2014 - 02:41 am, by:  Mees Godwaldt (Mees) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Absolutely! I already balanced a coin on the camcover at idle
Scott Vim
Goo Roo
Vic
Soarer (1uz) Chaser (1jz)

Posts: 1188
Reg: 12-2010

Top of pagePrevious messageNext messageBottom of page Link to this message

Rating: N/A
Votes: 0 (Vote!)

Saturday, November 15, 2014 - 03:40 am, by:  Scott Vim (1uz1jz) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

50 cent coin.

Add Your Message Here
Eye Candy
Click for full size
Bold text Italics Underline Center Text Upload photo from your hard drive Make a List Make a Table Make an Image Thumbnail Create a hyperlink Insert a clipart image Formatting Help
         

Username: Important Posting Information:
If asking a question, have you done a search to see if your question has already been answered?
Be aware that the use of SMS-speak eg "u" instead of "you" etc, will get your post deleted.
Password:
Enable HTML code in message
Automatically activate URLs in message

  Administration Administration      Log Out Log Out Previous Previous      Next Next