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Ecu, Bcu.... Change


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Posted

hi guys i have got a c5 2.0 hdi lx which seems to be riddled with problems. my turbo does not seem to be cutting in and acceleration is poor. the engine management light has come on cos of the turbo and has put me own onto limp home mode. ie cant do more than 2500 revs.

my mate is scraping his c5 and i have access to some of his parts... now to get to my questions

1) can i swap the ECU alone from his car... would my key work??? would the mileage on the digital display change... well he has got more than 200k on his clock :angry: .

2) would i have to change the BCU along with the ECU.... i guess i would need to change the keys and remote and stuff then which would be a bummer.

3)what about the audio system would mine work if i change the ECU and what other problems can be expected from a good working ECU from another car...

cheers

Posted

forget the ECU swap yours is linked to your car I would suggest having it checked for fault codes then post them here so we can scrutinise them and give you a proper resolve.

 

ps get his MAF sensor if he will part with it as this is a common issue with your problem

Posted

To make the engine ECU work you would also need the BSI and the ignition key set as these component are all programmed for the immobilizer operation.

 

If you fit the BSI to your vehicle you do need to be aware of the Mileage indicator problem that you speak of.......in simple terms whichever component has the highest mileage recorded in it will over write the component with the lower mileage.....so a 200,000 mile BSI will over write a 70,000 mile speedo and this is non reversable. In some instances for diagnostic purposes it can be done but dont connect the speedo.....only problem is you cant see if the diagnostic lamp has come on!

 

With regards swopping radios........the vehicle chassis number is programmed into the radio and also the BSI, so if a radio is fitted into a vehicle or connected to a BSI with a different chassis number it wont work.

 

The Radio can have the chassis number reprogrammed if you want to make use of a secondhand unit.....but the BSI Cant have it reprogrammed.

 

Should also be noted that for a BSI to be compatible with another vehicle the vehicles should have the same level of equipment other wise you will find some functions on the vehicle may not work.

Posted
forget the ECU swap yours is linked to your car I would suggest having it checked for fault codes then post them here so we can scrutinise them and give you a proper resolve.

 

ps get his MAF sensor if he will part with it as this is a common issue with your problem

 

k thanx guys guess i wont go anywhere near the brain transplant. here are the fault codes P0101 - mass or volume air flow, P0110- intake air temp sensor 1 circuit, p0100- mass or volume air flow "a" circuit coherence.

what i have done so far is to check the small tubings just infront of the engine bulkhead. am a ships engineer and not equipped to check in much detail. my mechanic seems to quite a well informed but seems to be on the verge of shooing off on a holiday... so i am stuck half way with some parts that may be scavenged not but dont think i will get it in 2 weeks time when the mech comes back... so any advice appreciated and pls do let me know what the usual suspects are so as to scavenge the parts....

cheers

Posted
k thanx guys guess i wont go anywhere near the brain transplant. here are the fault codes P0101 - mass or volume air flow, P0110- intake air temp sensor 1 circuit, p0100- mass or volume air flow "a" circuit coherence.

what i have done so far is to check the small tubings just infront of the engine bulkhead. am a ships engineer and not equipped to check in much detail. my mechanic seems to quite a well informed but seems to be on the verge of shooing off on a holiday... so i am stuck half way with some parts that may be scavenged not but dont think i will get it in 2 weeks time when the mech comes back... so any advice appreciated and pls do let me know what the usual suspects are so as to scavenge the parts....

cheers

 

Definately get the MAF sensor, sounds like the classic symptoms, and is a breeze to fit, 2 screws and a jubilee clip ! Better still, just grab the whole air filter assembly, as the MAF sits on the end of it. The air temp sensor is also part of the MAF sensor. They do take some stick, and for the sake of £60 new from ebay, I am going to replace mine every 2 years, such is the effect it has on driveability and economy.

 

Good luck.

Posted
Definately get the MAF sensor, sounds like the classic symptoms, and is a breeze to fit, 2 screws and a jubilee clip ! Better still, just grab the whole air filter assembly, as the MAF sits on the end of it. The air temp sensor is also part of the MAF sensor. They do take some stick, and for the sake of £60 new from ebay, I am going to replace mine every 2 years, such is the effect it has on driveability and economy.

 

Good luck.

k thanx guys i have checked my MAF sensor by taking it off... and looking inside the tubing.... it is definitly knackered.... the mirror thingamy was full of dirt and opaque.... the arms protruding out was badly corroded... so that has to go... will be a couple of days before i get the sensor so will keep you posted...

oh by the way the turbo does not seem to be kicking in and there is a major lack of power going up inclines on the motorway... are these connected and what other parts would u guys recomend... i have another issue will post it as a new post as no one seems to have had this odd one

Posted
k thanx guys i have checked my MAF sensor by taking it off... and looking inside the tubing.... it is definitly knackered.... the mirror thingamy was full of dirt and opaque.... the arms protruding out was badly corroded... so that has to go... will be a couple of days before i get the sensor so will keep you posted...

oh by the way the turbo does not seem to be kicking in and there is a major lack of power going up inclines on the motorway... are these connected and what other parts would u guys recomend... i have another issue will post it as a new post as no one seems to have had this odd one

i wouldnt try anything else till youve replaced the mass airflow as the other codes could be as a result of the mass airflow being u/s

Posted
i wouldnt try anything else till youve replaced the mass airflow as the other codes could be as a result of the mass airflow being u/s

k i have got the MAF sensor changed... and still no joy with the turbo it seems to be taking while t kick in and am not getting the accleration it is supposed to give in the 1st 3 gears.... as for the the incline bit it is still horrible doing 30+ nd seeing those huge rigs overtake me along the inclines. i dont get enough power on the 4th and 5th gear to pull the car and on the 3rd gear the darn limiter kicks in so am stuck on both ends....

the diag still seem to be showing a oil sensor fault.... though i dont see what it has to do with the turbo....

oh as for mileage i still seem to averaging around 9-10 miles a liter or 40-45 MPG

Posted
k i have got the MAF sensor changed... and still no joy with the turbo it seems to be taking while t kick in and am not getting the accleration it is supposed to give in the 1st 3 gears.... as for the the incline bit it is still horrible doing 30+ nd seeing those huge rigs overtake me along the inclines. i dont get enough power on the 4th and 5th gear to pull the car and on the 3rd gear the darn limiter kicks in so am stuck on both ends....

the diag still seem to be showing a oil sensor fault.... though i dont see what it has to do with the turbo....

oh as for mileage i still seem to averaging around 9-10 miles a liter or 40-45 MPG

Is your engine lite on and your running in limp mode. And your up to dates with a service

Posted
k i have got the MAF sensor changed... and still no joy with the turbo it seems to be taking while t kick in and am not getting the acceleration it is supposed to give in the 1st 3 gears....

 

You must check and be 100% sure that there is no leak in the inlet side of the manifold downstream from the turbo - I've seen this problem quite a few times. This needs to be 100% checked before any more serious costs are incurred.

 

Some cars have a manifold absolute pressure sensor (MAP) and if this damaged or disconnected then the same problem will arise.

 

If the service is showing the car might be in limp home mode - this also needs sorting......

 

Not sure what limitations the oil level warning might be placing on you....

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