astra h 1.7cdti u2105 error. dead car

**zorgman** · 17th April, 2010, 09:33 PM

hi
totally stuck on my car now cannot get it to start so heres what is going on
u2105 fault code can bus error.
no speedo
no tacho
oil light comes on and goes out
esp light on
car with spanner light on
fuel gauge goes to half then drops to 0
no starter ( a relay clicks on engine fusebox)
fully charged battery with 90amp slave using welding cable jump leads.
have changed complete fusebox checked everything in sight now im stuck.
cant find ecu only a circuit board in fuse box and a load of connectors in boot
have read every thing i can find on net but no answers. have seen article on cim unit but indicators lights etc all work.
so now im stuck have only used car for 5 miles since i got it 3 weeks ago (private sale so no going back)
please anyone on here can help as this seems the only place where i can get proper help.

**synkrotronic** · 17th April, 2010, 10:33 PM

Hi
Disconnect battery.
On diagnostic socket,try to read resistance with digital multimeter,between 6 and 14 pins (can lines).Must read 55-65 Ohm if can lines ok.

Regards

**synkrotronic** · 17th April, 2010, 10:50 PM

Hi again.
U2105- No communication ABS with Engine
Maybe dashboard problem or need to reprogram car
Remember can bus communicate with all ecm on car(engine,airbag,abs,immo...)

Regards

**smirnoff_rules** · 17th April, 2010, 10:54 PM

sounds like the ecm ( not ecu )is playing up there about 500 notes too

**obdmaster** · 17th April, 2010, 10:59 PM

Think the ecm on these is just behind the bumper on the n/s in england that is, and the plugs get full of water as does the loom underneath the covering of loom and corrodes.

On these CAN cars, with CAN problems, do a global test clear all codes and the unit which has the most codes return is USUALLY the faulty unit m8. Learnt this on vectra c what had a CIM problem on opels the CIM unit is the CAN gateway m8.

**racin-snake** · 17th April, 2010, 11:01 PM

try the connections on the back of the clocks if its like the corsa c then it may be a poor connectin there ?
cheapest option hope someone else can shed some light ?

**Meat-Head** · 17th April, 2010, 11:07 PM

the word on the street says CIM but it's 11pm on a saturday night.

**cristi_onofrei** · 17th April, 2010, 11:18 PM

check can line from ABS to engine, is common problem and is cut close to ECM
HI speed CAN : CIM, UEC, ABS, ECM
if exist in this line interruption car don't start

**zorgman** · 18th April, 2010, 12:52 AM

thanks for info.
only code shown is u2105 (perm) wont clear, will look for the ecm unit sun morn. this cim thing, only thing thats behind wheel is indicator arms

**dafdiagnos** · 18th April, 2010, 07:19 PM

check can network, should be 60 ohm if ok across can h and can L. if broken circuit, will be 120 ohm. will also get 2.5v can h to earth & 2.5v can L to earth- will determine which side is broken

**Meat-Head** · 18th April, 2010, 08:42 PM

Originally Posted by dafdiagnos

check can network, should be 60 ohm if ok across can h and can L. if broken circuit, will be 120 ohm. will also get 2.5v can h to earth & 2.5v can L to earth- will determine which side is broken

Is this for ANY can car or just this make/model

Sorry for hijacking.

**obdmaster** · 18th April, 2010, 09:09 PM

Originally Posted by Meat-Head

Is this for ANY can car or just this make/model

Sorry for hijacking.

This will help you meat head m8

**zorgman** · 18th April, 2010, 10:27 PM

intresting reading that pdf. why do i think that ive got a expensive repair on my hands here, but i stick it out im sure that makers are geting far far too technical for thier own good ie: relying far too much on computers to run the car even main dealers dont know what there doing now by what iv read its a case of replace and see what happens with the poor punter paying the cost

**dafdiagnos** · 19th April, 2010, 09:59 PM

Originally Posted by Meat-Head

Is this for ANY can car or just this make/model

Sorry for hijacking.

yes mate, this is the norm for any 12 / 24v vehicle can network

**nutloose** · 20th April, 2010, 01:12 AM

the ecm is usually behind the plastic arch liner of the n/s/f wheel, below the fusebox which is also an active controller on the canbus (H,M and L). Bothof which along with the CIM have to be coded including VIN and PIN as a matched set to properly function.
Water in the "underbonnet module"(fusebox) may cause your faults.
You can connect directly to the modules with diagnostic tools on the bench.

disconnect all non essential controllers and attempt to find the area of canbus causing the fault.

you may find the ecm number is 0281012694