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Old 25th March 2020, 21:56   #1
chicochapman
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Default Problem "ECU not present or not connected"

Toaf won't talk to my airbag ECU. It reads everything else.
T4 won't connect either as I've been to see BigRuss a couple of times last year.
So I decided to do a bit of continuity testing but first job access the ECU
Fortunately I'd watched Russ do this and more fortunately, the fixing bolts down
by the side of each seat hadn't been replaced by a previous owner, so I was able
to get at it without removing the seats, the whole centre console as well as avoiding
sruggling with the gear knob. Still fiddly to undo the torx fasteners holding the DCU in place
but a bent 1/8thW ring spanner(pictured) came in useful!






To facilitate the point to point testing I made up these leads terminating in a stub
of guitar string of matching diameter.





First up was the K-Bus, testing for continuity between Cavity 7 of the diagnostic
socket(C0040) and cavity 9 of the harness connector (C0256) – all good.
Next tested for12V+ on cavity 5 of the harness connector – all good and then
tested the ground on cavity 6 – all good.
I had a new identical spare unit (YWC 107090) which I fitted but still Toaf wouldn't read it.


So I've still got the annoying airbag warning light and because I can't connect to the DCU,
no means of finding where the fault is.


Any help would be much appreciated.
Malc
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Old 25th March 2020, 22:52   #2
vitesse
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Default

Standard Toaf will only read the airbags up until about 2002 and then Rover started using Autoliv. As your car is a later model you have to, if you haven't already tried, use the SRS Autoliv Tool available from the Toaf website. Another complication is that the tool requires Vista or higher to run it, but it works.

Regards
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Old 26th March 2020, 08:12   #3
marinabrian
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If you've tried to connect to the SRS DCU with it hanging on the connector like that, you can now throw it in the bin.

If power is applied to the SRS DCU without it being correctly earthed, it automatically logs it as crash data, and is scrap.

The connector must be unplugged, before the unit is unbolted, and the secondary earthing strap removed.

Fuse 12 in the passenger compartment fusebox is often removed by people attempting to "bypass" the SRS system, which results in non communication with T4, TOAF in standard format has an issue communication with the Autoliv system fitted to your car.

Time for another DCU I'm afraid

Brian
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O ring failure guide HERE an invaluable guide to O ring failure modes, that don't include nonsense about positioning of clips on KV6 thermostat pipework
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Old 26th March 2020, 17:32   #4
chicochapman
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Thanks very much for that Brian. Just never occurred to me that you could "fry" these things. Does a new one (£) have to be paired with the car and if so do you know if it can be done with Toaf?
Thanks again,
Malcolm
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Old 26th March 2020, 17:39   #5
chicochapman
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Quote:
Originally Posted by vitesse View Post
Standard Toaf will only read the airbags up until about 2002 and then Rover started using Autoliv. As your car is a later model you have to, if you haven't already tried, use the SRS Autoliv Tool available from the Toaf website. Another complication is that the tool requires Vista or higher to run it, but it works.

Regards

Thanks for the info. The "off assembly" date for my car was 2nd Sept 2002
so having downloaded the Toaf SRS tool, I'll try that first - after, that is I've bought a new DCU and managed to install it safely!!
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