Can a ECU be tested?

[Gibbon]

Another question

I bought a second hand Blitz 1JZ ECU. When connecting to my 1JZ, it runs fine for about 2 minutes, then floods the engine with fuel - to the point where the cylinders fill with fuel.

Swapping back the OEM ECU and the engine runs perfectly.

I've had the ECU looked at by someone who knows them backwards, and after he fixed a blown resister - it still does the same thing.

The guy I bought it off claims that the ECU needs tuning before running correctly, but my guy says that even tho' it has a blitz chip it is still a learning ECU and that it is faulty.

Is it possible to 'test' a ECU somehow to find out if it's faulty?

Thanks.

[oldcorollas]

sure, make up a timing circuit to act as the ignition trigger, put in pots as the temp sensors, another pot for the AFM/MAP and TPS, and outputs as LED's or going to a scope...

basically just need to replicate the inputs and outputs it would usualyl have..

the Megasquirt uses one (megastim) to check it's operation.

for your check, it would help to have a scope to check the changes in pulse width

[JetspeedCamry]

Or you could do the basic checks of resistance and voltage outlined in the service manual for your particular ECU? Do aftermarket ECU's have the same guides as factory ones?

[RT104GT]

In a word yes it can.

back in 1988 I made a whole simulated engine on a bench even drove the dizzy with a drill and had sparks going everywhere.

Most sensors can be replaced with potentiometers or batteries.

[Gibbon]

Thanks for the replies - but there's no way I can do any of that yet

What if I rephase the question a bit? - is there a blitz agent in Aus or somewhere that actually does the chip mods - or does it only happen in Japan? Google is not helping on this one...

[sideshow]

if the ecu is a 1jz std ecu with a blitz modified chip in it then it cannot be tuned easily
i dont think there is any blitz people in australia

all ecus like mines blitz etc etc are programmed in japan using their special chip burning tools so i doubt u will find them here

so i cant understand why it would need further tuning

i think the guy is just fuking you around

you can try pulling the ecu apart and while its running ently twist and flex the circuit board

to see if the problem comes and goes maybe theres a bad solder join somewhere

i would just try get your money back and dont waste any more time on it

and just by a microtech
atleast they have many people in australia that know them very good

[Gibbon]

Thanks Sideshow - the dude I bought it off on the forums swears that it needs to be tuned

He claims it came straight off a working car.

Does it make a difference if the OEM one is a auto ECU, and the blitz is a manual ECU.

[sideshow]

if your running manual gbox then it doesnt mattert what ecu u use

but when im at the jap imports and they have like a mines or blitz or whatever brand ecu

they are pre programmed

just ask him if they need to be programmed who the fuk in australia can do it

my reply is no one

i doubt you can tune it here in australia

the only thing you can do is find out what th eblitz ecu was tuned for

eg: what exhaust what injectors what this what that

so unless your engine had the similar specs that the ecu weas tuned for then your wasting your time and probably wasted yur money

anyway i see this very often but i dont mind it cause it just keeps me working fixing other peoples fuk ups hehehehe

[amichie]

Another question

I bought a second hand Blitz 1JZ ECU. When connecting to my 1JZ, it runs fine for about 2 minutes, then floods the engine with fuel - to the point where the cylinders fill with fuel.

Swapping back the OEM ECU and the engine runs perfectly.

I've had the ECU looked at by someone who knows them backwards, and after he fixed a blown resister - it still does the same thing.

The guy I bought it off claims that the ECU needs tuning before running correctly, but my guy says that even tho' it has a blitz chip it is still a learning ECU and that it is faulty.

Is it possible to 'test' a ECU somehow to find out if it's faulty?

Thanks.

There is a company in Western Sydney that will do full ECU scan for about $100 and give you a report.

I'll try and find out the contact details and send them to you.

[sideshow]

unless they can plug the ecu into a working car with matching engine

cannot see how they can test the ecu to 100% with all temps
all throttle ranges etc etc

usually what they test is the crank signals and the outputs

i have sent ecus for testing and they have actually asked me for wiring diagrams for the ecu

so go figure

they can test ecus but make sure if you get it repaired you get warranty or something saying they have fixed it cause sometimes i have seen that it doesnt cure the problem

and another thing is everyting might be working ok but the mixtures may be wrong and makin car run rich

how the fuk are ecu testers goin to test mixtures on the bench



i have hardly ever had probs with toyota or nissan ecus

mitsubishis have the worst record for ecus fuking up

at end of day if it runs perfect on a std ecu then thats telling you something