hello all , new subscriber here ( all thou ive visited here before for various bits )
my poor trusty renault scenic 2002 , 1.9 dci has finally died , so i am posting here for some advise
drove the car to the petrol station after work last week , no problem , filled up ( with the correct fuel ) and then it wouldnt start . turning over , but wont fire .
checked the immobiliser and that was fine ... took it to the garage and the fault codes came up as crank shaft sensor and that the ecu had fried ( in the words of the mechanic )
he said just write it off :-(
sureley there is something i can do ??
so ... advice is needed please
can i get a reconditioned ecu , or a new one from ebay
i see ecus on ebay with keys and immob kit .. so im guessing you have to change the lot
It was only a kwik fit mechanic that told me , because that's my local garage . He says the ecu was showing as blown as we had tried to jump start it with leads
I do get a lot of condensation in the car even thou I can't see any leaks . So I thought water must of got in somewhere which would explain electrics blowing
I'll tow the car home , fix the sensor and get the fault codes from him
The ECU is basically an industrial computer in the engine bay. The makers know that it will take all sorts of abuse that would kill a home PC.... like stray electrical energy, heat, moisture, vibration, shock.
So it is pretty rugged. They know people will need to jump start the motor so protect against the sort of spikes this can cause.
It can fail but millions out there don't. It is one of the more reliable components on a modern car.
The connection to the outside world is the diagnostics port. By law, this has to comply with OBD, European, diagnostics design.
And does.
But the basic OBD architecture does not suit modern car electronics and certainly doesn't give Renault all they wanted.
So there is much that can be read by a generic reader that makes little if any sense. And much that a generic reader will not even see.
If a generic reader is plugged in, the unwary can see strange readings, especially if the battery level is low or has been.
Very easy to take a flying leap to an incorrect assumption based on those.
Last week, in the cold, my battery decided to give up.... Wirr...wirr...wu...dead...... jump start.
The dashboard was telling me things like not in neutral, press brake or clutch, despite those not applying.
What an OBDii reader would have found, dunno but short term errors, probably plenty.
Please feel free to correct, always willing to learn and while open to criticism, believe an explanation would help not only myself but others reading.
Right then . The car is home and on my drive . I've purchased a new tdc sensor , which will be the first job . I can see it on the right of the engine - any tips how to get to it ?
kwak fot is almost as much good as the orange bike shop for technical expertise.
renault cars need specialists (even some reno dealers have a hard time sorting out customers cars and they are supposed to be trained up to fix them)
if you need to do diags on them you must have a RENO CAN-CLIP (originals or clones are more than good enough and far better than cheapo ELM toys...)
TDC is under the induction pipes on the top of the gearbox. undo the jubliee clips on the intercooler and intake pipes on the back of the engine.
then you have lots of room to work with.
do make sure you refit and make the jubilee clips are tightened up as its a high pressure system.
easy to do, and you just saved yourself £150 in garage bills.
If no pump heard you may have tripped the ineria switch or its faulty with ign on check it has 12v either side of the switch dont forget to press the button as well
ron