Car broke down - ODB error codes 14 and 24

[yoshi123]

Thanks, I'll try to check all the grounds. My mechanic says harnesses and such like just don't fail in Toyotas though. I have to work through

- coil packs test
- spark plugs
- ignitor test

As the car warmed up, then failed. Cooled down for 1h20mins then ran. I am considering something is getting hot and failing e.g.ignitor.

The TOMS ecu does a few things, delimits boost, delimits speed. Ignition timing advance (more responsive lower rpms). Boost seems to be set to 1.6bar on this one if you let it control the solenoid - my solenoid is controlled by Blitz boost.

If you run it, you'll need 99RON at worst, 100RON ideally.

No links but you could check the TOMS website.

[pwpanas]

Originally Posted by yoshi123

Thanks, I'll try to check all the grounds. My mechanic says harnesses and such like just don't fail in Toyotas though. I have to work through

- coil packs test
- spark plugs
- ignitor test

As the car warmed up, then failed. Cooled down for 1h20mins then ran. I am considering something is getting hot and failing e.g.ignitor.

The TOMS ecu does a few things, delimits boost, delimits speed. Ignition timing advance (more responsive lower rpms). Boost seems to be set to 1.6bar on this one if you let it control the solenoid - my solenoid is controlled by Blitz boost.

If you run it, you'll need 99RON at worst, 100RON ideally.

No links but you could check the TOMS website.

Agreed - harnesses and such like just don't fail in BONE-STOCK Toyotas. However, yours isn't. As you might guess, the quality of work associated with aftermarket modifications varies widely, which is why that is the most significant variable in why your Supra is behaving so erratically...and thus our first candidate for troubleshooting.

Note: The coil pack test specified in the TSRM is pretty useless. Oem coilpacks get weak long before they fail, and the only way to test a weak coilpack is to swap it out*. However, there is one thing related to the coilpacks you can check for: The heat from the 2jz-gte often causes the plastic coilpack harness connectors to fail (the plastic breaks inside the connector), which can result in erratic ignition. New coilpack connectors are inexpensive and can be ordered from Toyota; they're pretty simple to install too.

In addition, the easiest way to test the ignitor is to swap it out with a used one from another Mkiv Supra Turbo.

If your Supra hasn't had the coolant changed regularly, I've seen oem temp sensors fail from corrosion...that could be related.

Re: The TOMs ECU - is it completely 'plug-and-play'? ...or does it need to be wired in (solder/crimping/etc.)?

Do you have a link to the Toms web site?

*Since oem coilpacks are consumeable - they really only last about 75,000 miles - purchasing a spare one for testing isn't a bad investment at all. If the problem ends up being the coilpacks and your mileage is >75K, just get five more coilpacks and swap them all.

[yoshi123]

Thanks - what is the symptom of an erratic coil pack? I thought the car would misfire and stutter first....in my case the car just DIES and the engine runs sweet otherwise.

My temp sensor seems fine, had a rad failure few months ago so the fluid has been changed.

The TOMS ECU is an entire ECU. It is a Toyota ECU reprogrammed by TOMS. It plugs straight into the connectors, so I doubt there is a duff connection here, but obviously cannot rule that out either.

I'm going to fault trace the ignition system and sparks/coils this week. See what I can find.

[pwpanas]

Originally Posted by yoshi123

Thanks - what is the symptom of an erratic coil pack? I thought the car would misfire and stutter first....in my case the car just DIES and the engine runs sweet otherwise.

My temp sensor seems fine, had a rad failure few months ago so the fluid has been changed.

The TOMS ECU is an entire ECU. It is a Toyota ECU reprogrammed by TOMS. It plugs straight into the connectors, so I doubt there is a duff connection here, but obviously cannot rule that out either.

I'm going to fault trace the ignition system and sparks/coils this week. See what I can find.

I was only telling you about coilpacks since you mentioned them in your post. I agree bad coilpack(s) doesn't seem to be the primary cause of your Supra's issue(s).

Good luck with troubleshooting. If you have the TSRM, I'd recommend following the step-by-step procedures within. Please keep us informed.

[yoshi123]

Thanks, will post up my findings here. I'm leaning towards the ignitor or a bad ECU, outside chance coil packs/MAF.

[pwpanas]

Originally Posted by yoshi123

Thanks, will post up my findings here. I'm leaning towards the ignitor or a bad ECU, outside chance coil packs/MAF.

Any updates?

[yoshi123]

I haven't had my friend over with the oscilliscope to do the testing.

However, I did this

- started car, let idle. Car cut out between 20-30minutes. Felt the ignitor, it was hot/warm.

- let car cool down, prob 30 mins. Started car, cut out immediately. Felt ignitor, it was cold.

This is making me consider it isn't the ignitor.

2nd thing I did was pull the TOMS ECU. I found brown liquid stuff on one connector of the 5 connectors of the TOMS ECU. I thought this would be the problem. So I clean up the connector, and put in a STOCK ECU inside this time. Car still cut out. Damn.

I took apart the TOMS ecu, didn't see any components leaking. Odd.

Spoke to my mechanic, said check sparks, HT leads, ignitor, coils. He then said I'd have to check the fuel pump after this...

I will hopefully check by next week, although if we presume something is heating up and failing, then it tend would rule out the ignitor as this was stone cold and the car still failed to start. The car then started fine the following morning. It could still be the ignitor of course but it's an outside chance. And I think I can rule out the ECU also.