Anyone changed an ECU?

[Tiberius]

Just wondering if anyone had changed an ECU, and how was the information tranfered from one to another? i.e. chassis number, milage, etc?

or is it not stored on the ECU.?

Its on a 2005 1.9tdi ALH

Thx in advance

[Tech1e]

Is it a new ECU?

You need security login codes to transfer all the info. If you dont have the codes then its a dealer only job.

[Tiberius]

Haven't yet priced new.

Some on ebay about £175, but they arent the correct letter suffix.

I have only one code, that came in a white plastic holder.

So it looks to be a dealer job, ouch.

[shark_90]

There are various tools out there that can read PIN codes. What are you trying to do and why?

[Tiberius]

The current ECU is thowing up a few codes that I cant get rid of.

I can drive around for and hour with the laptop connected and showing no codes, then all of a sudden I get these codes together. I think that when the ECU gets warm a dry joint makes a bad connection.

17957 - Boost Pressure Regulation Valve (N75): Open or Short to Ground

P1549 - 35-10 - - - Intermittent

18027 - Glow Plug Relay (J52): Open or Short to Ground

P1619 - 35-10 - - - Intermittent

17849 - EGR Valve (N18): Open Circuit or Short to Ground

P1441 - 35-10 - - - Intermittent

19561 - Valve for Intake Manifold Flap (N239): Open or Short to Ground

P3105 - 35-10 - - - Intermittent

17660 - Cold Start Injector (N108): Open or Short to Ground

P1252 - 35-10 - - - Intermittent

01314 - Engine Control Module

013 - Check DTC Memory - Intermittent

Airbags

00532 - Supply Voltage B+

07-10 - Signal too Low - Intermittent

Centr. Locks

01044 - Control Module Incorrectly Coded

35-00 - -

Someone of tdiclub has had a simalar problem and was fixed with another ECU.

So I was going to get a new or secondhand ECU and install it, just wandering if anyone had? and how to go about it.

[rwbaldwin]

Before changing the ECU I would change relay 428. I think this is more likely to be the cause.

[Basil]

do a search - I posted up the way to do it some time ago.

HTH

Bas

[Guest westallc]

try the relay mate 428 or the 409 should do the trick:thumbup:

[Tiberius]

Erm, looked under the bonnet for the 428 relay next to the air cleaner and its not there. The box isnt even there for the relay.

Anyone have any idea where it is?

[Tiberius]

Thank for advice on the 428 relay but I dont think its fitted to this model. There is no additional relay box mounted on the bulkhead next to air filter.

I cannot find it in the footwell either. But one of the relays must be powering the ECU does anyone know which one from this picture??

[Tech1e]

The ECU power relay is in the car, very prone to fail as our learned rwbaldwin has said.

I thought the ECU power relay was 109.

But a fool proof way to find out which one it is is clear your fault codes, pull each relay out and when you cant start the car and get those faults again thats the kiddie.

[Tiberius]

Thanks all,

Just looked on Autodata and that only gives me a circuit diagram, but without the relay identifiers :(

Will try lummox's suggestion tommorrow and report back. Maybe put a voltmeter in Fuse 34 to see if that saves time.

[Tiberius]

Looks like the ECU power relay on this car is a 469 relay, and damm that relay for giving me trouble for the past 6 months.

Replace and everything is running fine, thanks to you all.

[DGW]

Good to hear it is now fixed, and thanks for the feedback on the offending relay.