Hi, I am new in here but my mate told me that this is best zx club. So i decide you may will help me.

 

Well changed my injectors and than I was changing chip i left my ecu opened and some how smokes came out from ecu. So now i am looking for a problem.

I took new ECU, new ptu, new relays and fuses and its still the same.

Than we connected conzult program and it's showing error code 21.

So what could it be? I know its some ignition circuit error.

Another thing, spark plugs give only very small sparks and i thing injectors dont give any fuel to the cylinders.

It's could be some burn wire fault or what?

 

Please help me dont know what to do and how can help me.!

Ignition circuit fault, check the PTU connectors. either that or the CAS / coilpack connectors.

 

But i would lay my bet on the PTU connectors.

 

as for the other issues of fuel, are you sure the injectors are firing, you could need a new wiring loom if the old ECU heated up, it might of melted the engine loom at some point creating a short.

 

Oh and welcome to best 300zx z32 forum in the UK

Thanks mate

 

Oh yeah i checked the CAS with other one and its ok.

What could be wrong with ptu or coilpack connectors ?

 

So if i will change a loom, is it hard to pull it out from interior to outside? I heard that is takes a lot time?

And if its not loom fail than its a time waste.

Thanks mate

 

Oh yeah i checked the CAS with other one and its ok.

What could be wrong with ptu or coilpack connectors ?

 

So if i will change a loom, is it hard to pull it out from interior to outside? I heard that is takes a lot time?

And if its not loom fail than its a time waste.

 

are you good with a volt metre, if you are you could always check the continuity of the wiring loom, though that might take a while.

 

But first get the PTU off, check the connectors for corrosion.

 

Engine loom is relatively easy to change, just need to remove the ecu's and a plate that stops the loom from exiting out of the fire wall, then its a case of unplugging it from the engine and plugging the new one in, even if it doesnt fix the problem, you would have fresh connectors on everything, so would eliminate a major headache.

The earlier Die cast finned type 1 PTU often fails check first if faulty you may have to fit a type 2 unit.

Well i checkes my ptu with another one and its working ok. I dont want to believe but only one thing that can be wrong and can think about is wires.

 

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Well i checkes my ptu with another one and its working ok. I dont want to believe but only one thing that can be wrong and can think about is wires.

are you good with a volt metre, if you are you could always check the continuity of the wiring loom, though that might take a while.

 

But first get the PTU off, check the connectors for corrosion.

 

Engine loom is relatively easy to change, just need to remove the ecu's and a plate that stops the loom from exiting out of the fire wall, then its a case of unplugging it from the engine and plugging the new one in, even if it doesnt fix the problem, you would have fresh connectors on everything, so would eliminate a major headache.

 

Ok i got spare ecu loom so i can change but can i take that metal plate which hold loom from exiting if the front dash panel is on??

How i can reach that srew just to undo?

Ok i got spare ecu loom so i can change but can i take that metal plate which hold loom from exiting if the front dash panel is on??

How i can reach that srew just to undo?

 

you need to remove the ECU's if you remove the passenger seat as well so you can basically lay down and look up, you should see the panel is accessible even with the dash in place. as with anything on the 300zx, its tight but doable lol

you need to remove the ECU's if you remove the passenger seat as well so you can basically lay down and look up, you should see the panel is accessible even with the dash in place. as with anything on the 300zx, its tight but doable lol

 

Thanks mate, tomorrow i will have a try :)

But if I will change a loom and its still will be the same? Lol

Thanks mate, tomorrow i will have a try :)

But if I will change a loom and its still will be the same? Lol

 

if its still the same after then, then at least we can rule out the loom as a possibility, which should make things easier. Make sure you clean all connectors on the items you are plugging the loom into.

if its still the same after then, then at least we can rule out the loom as a possibility, which should make things easier. Make sure you clean all connectors on the items you are plugging the loom into.

 

I just tried to take the loom out, but its impossible to pull out and undo that metal plate which stops loom from exeting. Only one way to remove front panel. Does anyone knows another way to take loom out from interior????

Right OK. Today i had a chance to change engine loom. I installed but its the same. Engine dont want to start.

What could it be???!!!

Is just getting annoying.

New ecu, new ptu, new relays and loom but its still the same!

Please does anyone knoes what could it be? O just know any good zed mechanic that can come to my house.

Right OK. Today i had a chance to change engine loom. I installed but its the same. Engine dont want to start.

What could it be???!!!

Is just getting annoying.

New ecu, new ptu, new relays and loom but its still the same!

Please does anyone knoes what could it be? O just know any good zed mechanic that can come to my house.

 

have you got sufficient fuel getting to the injectors? are they even firing? if you unplug and remove the cas, and then spin the spindal for the CAS on the engine, you should hear the injectors clicking (electric on but engine not running)

Have you checked all of the fuses? I would start with the ones on the passenger side in the engine bay.

I think I had code 21, it was the fuel temp sensor on the fuel rail, it's just a spade connector, but this wouldn't stop it starting or running.

Well injectors not firing its not giving any fuel to cylinders.

 

Yes also i cheched all fuses.

 

I can change fuel temperature sensor but does it will do anything with starting engine?

 

That a nightmare. Where i can find a good zed mechanic that can fix this thing??

Are you getting any spark?

Are you getting any spark?

 

Mate i got no spark as well, last week i checked and i had very small spark but now after engine loom swap i dont have AGAIN.

 

I cant understand anymore what could be wrong?

 

No spark an no fuel i think that is connected somehow. Is there any chance that if injector not firing than spark doesnt work as well, may be ecu should do this?

I have a code 21 at the moment. From what I understand, Spark issues can be down to: PTU, coilpack, CAS, ECU.

 

Fuel issues are down to: Fuel pump (pressure), CAS, ECU.

 

So if you have both, then I guess it's either CAS or ECU, or both.

I have a code 21 at the moment. From what I understand, Spark issues can be down to: PTU, coilpack, CAS, ECU.

 

Fuel issues are down to: Fuel pump (pressure), CAS, ECU.

 

So if you have both, then I guess it's either CAS or ECU, or both.

 

 

That a good answer mate but i all ready changed my Ecu and i also checked my Cas on other zed.

Last night i thought it can be my imobiliser but its not.

Well if your truly stumped then there's always zedworld. If I can't fix mine soon, it'll be going there :blink:

when you changed the ecu and loom check that you havent over tightened the central bolt on the loom plug to the ecu, if over tightened will cause poor or NO connection for some of the cars systems, just needs to be nipped up not tight.

I've just got my car to start. Once I got another PTU, it didn't start, so I used electrical contact cleaner on as many units and harnesses as I could easily get to. Gave them all a very good clean and it started on the first crank. :laugh:

 

So for you it may be as simple as giving all the relevant connections a ruddy good clean, because corrosion on the terminals can stop these cars dead in their tracks.