right i have been trying to help someone with his z which stopped starting a while back now it turns over fine.

 

he has replaced

fuel pump

cleaned alot of the connectors

 

 

now i went over there today to have a look firstly there is a code 21 which is

 

ignition system circuit.

 

Malfunction Caused By:The ignition signal in the primary circuit is not entered during engine cranking or running.

 

check :Harness and connector

Power Transistor Unit

 

now i tried my series 2 ptu on his car reset the ecu which i thought was long enough (10 mins) and tried again. it still gives a code 21

 

we did eventially manage to get a little cough out of the ol gal before that battery went flat but thats it!!

 

now i said that we will try her tomorrow with a full battery and allow the ecu to forget overnight.

 

what i was thinking was would a tt start with a non turbo ecu?

what i was tinking was to take my ecu over to illiminate it from the equation.

 

now i went over there today to have a look firstly there is a code 21 which is

 

ignition system circuit.

 

Malfunction Caused By:The ignition signal in the primary circuit is not entered during engine cranking or running.

 

check :Harness and connector

Power Transistor Unit

 

now i tried my series 2 ptu on his car reset the ecu which i thought was long enough (10 mins) and tried again. it still gives a code 21

 

 

what i was thinking was would a tt start with a non turbo ecu?

what i was tinking was to take my ecu over to illiminate it from the equation.

 

 

Code 21 also refers to the cas unit ( primary circuit trigger) check the connection here, mark the position of the cas unit and then remove ( 3 x 10 mm bolts) then with the ignition on and the cas unit connected spin the drive shaft, if it is working the injectors will click and you will hear fuel been pumped around the fuel rail.

 

The injectors are smaller delivery on a non turbo so the ecu is mapped accordingly, its likely that the engine would flood using a n/a ecu as the larger TT injectors will be getting an incorrect signal, this may add to the problem as the engine could well be flooded anyway, this is common when issues with connections arise, ensure that the spark plugs are not fouled, very often the very action of looking for these faults can cause more similar faults as connections to sensors are easily disturbed.

 

Starting again with a fully charged battery is a good idea, once connected do a code check BEFORE attempting to start and all codes should be clear. Any codes that appear later if it does not start are current and should help towards pin pointing the problem.

 

Good luck matey

 

Jeff

Code 21 also refers to the cas unit ( primary circuit trigger) check the connection here, mark the position of the cas unit and then remove ( 3 x 10 mm bolts) then with the ignition on and the cas unit connected spin the drive shaft, if it is working the injectors will click and you will hear fuel been pumped around the fuel rail.

 

The injectors are smaller delivery on a non turbo so the ecu is mapped accordingly, its likely that the engine would flood using a n/a ecu as the larger TT injectors will be getting an incorrect signal, this may add to the problem as the engine could well be flooded anyway, this is common when issues with connections arise, ensure that the spark plugs are not fouled, very often the very action of looking for these faults can cause more similar faults as connections to sensors are easily disturbed.

 

Starting again with a fully charged battery is a good idea, once connected do a code check BEFORE attempting to start and all codes should be clear. Any codes that appear later if it does not start are current and should help towards pin pointing the problem.

 

Good luck matey

 

Jeff

 

thank you very much jeff for the detailed reply ;) your a star *

thank you very much jeff for the detailed reply ;) your a star *

 

Your very welcome, I will keep a check on the forum tomorrow so if you have anymore issues post them or pm and will try to help.

 

Jeff TT

ok an update on today tasks. checked the cas unit and all 6 injectors are firing when the cas is rotated. now we tried taking the fuel pipe off and cranking over the engine and found there was no fuel delivery.(has had new pump fitted)

 

what we did was using the tech article we bypassed the fuel pump ecu. chranked over and had fuel being fed to the fuel rail which was a result.

 

now we still are getting a code 21 and went round checking and cleaning connectors. so far illiminated

cleaned water temp sensor

 

cleaned tps sensor connector

 

checked spark with spare coil pack and plug (spark being delivered to each coil pack but not each coil pack individually etsted)

 

ptu (tried my series2 known working one)

 

maf (tried my known working one)

 

cas (cleaned and check injector clicking on each cylinder)

 

spark being delivered to coilpacks.

 

fuel now being delivered to rail

 

what we did find was that the ecu had some water marks over it, eg some rust in the flow direction across body of ecu. we took it out to inspect for internal water damage which there was non visable but what we did find was that the ecu had been socketed with a socket and a superchip eprom fitted, now the soldering is a lot to be desired so i have recommended that he try a stock ecu before we go any further in our investigation.

 

cheers for you help jeff

 

gaz

Well done for the checks you have done so far, the ecu water marks are very, very common so don`t get too worried by that.

 

Code 21 with a good spark is a conflict and a puzzle, know its a bit out there but a cambelt timing check may be a good idea, even just as an elliminator.

 

The right hand cover can be moved forward with some work and the belt alighned on the crankshaft and the two right hand camshafts.

 

Keep us updated on progress.

 

Jeff

another update. tried another ecu on the car today. also came up with the code 21!!!!

 

FFS!! its sooo annoying as she wants to fire i can feel it in me bones LOL

 

EVERY NOW AND AGAIN SHE STUTTERS THEN JUST CONTINUES TO TURN OVER

 

what pins can i check on the ecu loom to check continuity to the ptu? also when we tried the cas the injectors clicked. now could there still be a potential problem there?

Did you test for spark on all, or just 1 ?

 

I know its a pain to do, but it may be worth pulling out each sparkplug, and cleaning it. If through all the attempted starts she has flooded, then the plugs can fowl and you may even have since rectified the fault by changing ECU/PTU/CAS ..etc but it still wont start becuase of fowled plugs.

Edited January 29, 201015 yr by Yowser

sounds like its flooded after trying so much, pull the fuel pump fuse (under bonnet infront of drivers side dash) its green i think? then turn engin over with a count of about 10 seconds.. this will deflood the engine now try putting the fuse back & give it a go? mine wouldnt start for love or money when it was flooded..even if left for days!! might be worth drying the plugs too?

Did you test for spark on all, or just 1 ?

 

I know its a pain to do, but it may be worth pulling out each sparkplug, and cleaning it. If through all the attempted starts she has flooded, then the plugs can fowl and you may even have since rectified the fault by changing ECU/PTU/CAS ..etc but it still wont start becuase of fowled plugs.

 

tested for spark on all connectors

 

flooding wouldnt cause a code 21 tho would it. there is still a problem on the ignition circuit regardless weather its flooded or not. but we will try taking plugs out. also going to try a continuity test on the loom from ptu to ecu.

Takes just seconds to check for flooding mate, just whip the fuse out for the fuel pump in the small fuse box drivers side by brake/clutch servo.

Try to start and after about teh 5th try, if it is almost there or is there in starting, job done.

 

It is strange with a code 21 as technically the injectors arn't delivering fuel, but you have tested and got fuel, so a flood test given how quickly you can do it, has gotta be worth a go.

smithy

Takes just seconds to check for flooding mate, just whip the fuse out for the fuel pump in the small fuse box drivers side by brake/clutch servo.

Try to start and after about teh 5th try, if it is almost there or is there in starting, job done.

 

It is strange with a code 21 as technically the injectors arn't delivering fuel, but you have tested and got fuel, so a flood test given how quickly you can do it, has gotta be worth a go.

smithy

 

i have taken the fuel pump fuse out and de-flooded the engine but she still not having it she still just turning over and thats it im well and truly stumped now like gaz said she wants to start i can feel it :(

hello mate i had a code 21 on mine,

it wouldnt start, but mine had no spark,my problem was my battery was not bolted in and had cut loom next to it which goes to coil pack relay,

hope you get it sorted mate,

youve replaced the PTU, but what about the connector? its not dirty isit?

 

i would focus on getting code 55 before going down the flooded route.

 

would also doube check the CAS & connector also.

 

are you sure all 6 injectors are clicking? not just 1 or 2?

youve replaced the PTU, but what about the connector? its not dirty isit?

 

i would focus on getting code 55 before going down the flooded route.

 

would also doube check the CAS & connector also.

 

are you sure all 6 injectors are clicking? not just 1 or 2?

 

all 6 are clicking. thats what i want to try and do is clear the code 21. once we are back to a code 55 then we can check other problems.

 

btw we did clean the connector.

I had the same problem...code 21...

Try looking at the ecu conector...i switched my ecu with another two and had the same code...finaly we discovered that some of the ecu's pins are crooked and when we plugged the first ecu in it pushed out the conectors from the plug...so they just barely made contact with the ecu... We pushed them back in, and the code 21 dissapeared...MAGIC...

But to discover the problem we passed through 3 ecu, 5 ptu, 24 coils, 2 ptu wirings...and a lot of nerves... Finaly we measured the tension going to the coils and 2 were getting very weak current...but sparked very light so we could be fooled...

hello mate

if its code 21 ignition circuit, id check coil pack relay,wiring,

the wiring runs up by the battery,

mine must of been breaking for ages, battery rubbed through 2 wires,it stopped dead when i went round a corner and broke 1 wire completley,but the 2 wires could of been touching and maybe showed up as a fault in the circuit,

hope you sort it,

ok before i left on holiday i checked everything you guys have said and still no luck the ptu cable behind the battery is fine no signs of rubbing i have also de-flooded the engine and re-checked all the fuses but still no life i am currently in lanzarote and will carry out more checks when i get back cheers for all your help guys and please feel free to keep helping as i need it

ok before i left on holiday i checked everything you guys have said and still no luck the ptu cable behind the battery is fine no signs of rubbing i have also de-flooded the engine and re-checked all the fuses but still no life i am currently in lanzarote and will carry out more checks when i get back cheers for all your help guys and please feel free to keep helping as i need it

 

phil i now have my new datascan cable for my pda so could come over when your back to check if you like?

 

hope it works this time:cursing:

awesome i am back now got back last night dam its cold here im free 2moz about half4 or im free sat and sunday morning so whenever your free will be cool i hope it works to i been looking at my car all day scratching my head

just checking but would the knock sensor have anything to do with my problems like i have said to gaz im not a wizz with zeds so i dunno if that could be it or not?