09 Citroen C2 1.4 Electrical Issues

[alex_alex]

LEXIA is reporting that there is no BATTERY voltage at the ECU. And you are not getting any voltage at the actuators.
There are a number of sources of power to the gearbox ECU but there is only 1 source that comes directly from the battery for the high current required by the actuators.
Power to the actuators comes through the ECU. I doubt that the ECU would be capable of cutting power to the actuators. So I would say that the ECU is not getting battery power in the first place.
What fuse are you checking? Have you traced THAT fuse to the battery and to the gearbox ECU connector?
On the 48 pin "green" connector at the gearbox ECU, there should be 1 thick green and yellow wire going to 3 pins of the connector. There should be another similar gauge (but different colour) wire going to another 3 pins of the same connector. That is battery power and ground. You should have 12V between those pins on that connector AT ALL TIMES.
If you do have power at the pins of the connector then check the pins in the receptacle of the ECU. Look for corrosion.
If you do not get 12V between those sets of pins then the fuse is blown or there is a wiring problem.

Exactly I have 3pin cable blue positive, and I have 3 pin green yellow negative. All 3 pin I have 12.07v

[alex_alex]

I checked insaid ECU GEARBOX voltage it's similar
3pin Blue 12.17 v

[alex_alex]

Still flash auto. Show. ,,- - ,,
I have P1795 . I don't know where it's problem,?

[GiveMeABreak]

Looks like you may need a new actuator as it has reached end of service life:

Fault Code:	P1795
Description of Fault:	Gearbox counter information: Coherence. The number of engagements and disengagements of gears has exceeded 1000000 cycles. Ignition switched on.
Conditions for Fault to clear:	Following replacement of the gear engagement actuator.
Downgrade Modes whilst Fault is active:	-
Symptoms:	-
Suspect Areas:	Gear engagement actuator Piloted manual gearbox ECU

[ozvtr]

Well you got rid of the P1702 power error but your P1795 error is back.
As Marc indicates, the P1795 seems to be a problem with the gear selector actuator.
You could try actuator tests in LEXIA but it might not perform them with the code set.
If you clear the code does it just come back?
I am not familiar with the process but you could try going through the actions, in LEXIA, of removing and installing the actuator. Don't actually remove the actuator from the car, just go through the process in LEXIA.

It's seems to be complaining that the actuator has done more than 1 million cycles and needs to be replaced! If you can fool the ECU into believing that you have replaced the actuator that might clear the fault?

[GiveMeABreak]

I can only think of it as being a safety issue - in that after this number of actuations there may a risk of the actuator playing up and that could have implications for driving safety.

I'm just speculating of course, but I can see why the system would attempt to prevent gear engagement after so many cycles. The potential scenario I'm thinking of is if the actuator fails and possibly drops the car from fourth or fifth gear to first gear unexpectedly.... So the software may have a set number of cycles before it won't play ball. If that's the case, I'm not so sure telling it the actuator has been replaced would be advisable. I'll see if there is anything else I can see...

Counters are maintained for the following:

The gearbox ECU memorises the number of moves made by the following components:

• The gear selector
• The controls at the steering wheel
• The clutch actuator
• The gearbox actuator

Of course there are various initialisation procedures to be carried out if any of the Clutch, Clutch Actuator, Gearbox Actuator, Gearbox ECU, Gearbox, Gear Selector or Steering Wheel Gear Controls are replaced.

[r4dzik]

hello, did you find the solution? i got exactly the same issue since a month. Spent much money and non mechanics solved the issue...

[alex_alex]

hello, did you find the solution? i got exactly the same issue since a month. Spent much money and non mechanics solved the issue...

Hi mate.
I didn't find the problem.If you know what the problem please let me know. Thanks

[PerfectBalance1]

Based on my experience with the Citroen C2 and its electrical issues, I can provide the following insights. I have encountered the exact same problems, including airbag failure, ABS failure, brake system failure, antipollution failure, electric circuit failure, airbag failure (again), seatbelt failure, and service requirement, on two separate occasions.

The first incident occurred approximately two years ago after a period of inclement weather consisting of rain and snow, during which the car remained stationary for about a week. The second incident took place around a week ago, following a period of approximately 14 days during which the car was not used, coinciding with another bout of rainy weather.

In response to these issues, I took the car to the garage, where we attempted a simple solution. We removed the battery for an hour and then reinstalled it, which effectively resolved the problems. The mechanic explained that these cars are particularly sensitive to rain, which can trigger false signals. Additionally, if the car remains unused for extended periods, the battery power diminishes, resulting in incorrect indicators being displayed.

Therefore, before investing any money into repairs, I recommend checking the battery and the alternator as the root cause of the issues is likely related to these components.