Tema: ZB 1.9 cdti fails to start, U2105 , U2139

[kaliope]

Hi mates,

I turned the key in the ignition today so as to start the bus, and nothing....no reaction...no activity. So i tired again and this time all was fine. I thought it was the immobiliser blocking the igintion but the story repeated a few times within a day. So plugged in the opcom and I got:


U2105 - CAN-Bus No Communication with the engine control module
U2139 - Invalid Data from CIM (Steering Column Module

P0115-71 - Engine Coolant Temperature Signal Range/Performance
P0460-71 - Fuel Level Sensor Circuit Range/Performance
P0500-71 - Vehicle Speed Signal Range/Performance
P0654-71 - Engine Speed Signal Range/Performance
P0550-71 - Mileage Circuit Range/Performance

B0655 - Brake-Light Switch Circuit Incorrect Signal

the code errors were distributed as follows:

CIM: 1 error
ABS/ESPTC/ECU: 1
EHPS (powered steering) : 1
IPC ECU: 5
DIS: 1

So the whole thing seems to be about U2105

Any ideas appreciated. I found on the web an almost identical issue on ZB and it occured it was broken wires between the ECU and the fusebox. I took the ecu off and all seems fine. I had a look at the wires getting out of the ecu and all seems fine. No dampness, no breakages.

A mate suggested checking relay no 14, K13, 70A. What I find interesting, when I took the relay off, the situation was exactly the same. No reaction of the fuel pump, no reaction of the starter, the ESP and the Spanner lights on, the fuel gauge goes down after a few seconds. However, getting a new relay didn’t help. But sure it must this relay’s circuit.




I made a video   

As you can see, first there is no reaction, no fuel pump, no glow plugs just the spanner and the ESP lights on and after a few sec the fuel gauge goes down and then the Fs appear on the display.

Then I turn the ignition on a few times and all is fine, the engine is ready to start


Then, I take the K3 relay off, then it comes back to the first situation, ie, no fuel pump, no glow plug, the fuel gauge goes down etc.


So, as you can see, it must something with this K3 relay circuit, am I right?
Zaffy fails to start, U2105 and U2139 error codes

Each time the errors are deleted, they all come back once the issue reoccurs.

[zruspi]

Can you start the engine?
I think it may be the alternator. Failing the alternator without battery has left.
To test, can you start the car with another car or starter battery?

[MAguayo]

I didn't took a look on codes with OPCOM, but it may be the same that ocurred to my zafira.

See CIM fuse (number 34 on UEC) Here you have

I had a known special cause, but Gorgel 999 doesn't know why it fused

[kaliope]

Well, for sure it is not the alternator. This an electrical problem. There is probably no communication between the circuit of relay 13 and the ECU

[kaliope]

the Zafira was at the electrician for one week. He finally said it was the ECU. The ECU was rapaired for 120 euro and I thought the problem was over. Today the same thing, again the same errors. I am helpless. I took the car the Opel Service. They will diagnose it tomorrow

[kaliope]

I picked up the car from the Opel Service. The ECU was changed.

[Chicago]

Does the car work properly again?

¿Vuelve a funcionar el coche correctamente?

[kaliope]

Yes the ecu has been changed and the problem hasn't come back. It all cost me 500 euros

[Chicago]

Ah, OK, all's well that ends well...

Ah, OK, bien está lo que bien acaba...