09 Citroen C2 1.4 Electrical Issues

[ozvtr]

I have exactly this problem my car Citroen c2 1.6 vtr petrol. I can't not found problem. I chege abs sensor.
Abs pump and not resolved.

Did you change the pump and ECU or just the pump (or just the ECU)?
It is very unlikely for 3 of the 4 ABS sensors to fail at the same time! So I would look much closer at the electrical connector at the ABS ECU for corrosion or a bad contact.

Seems that after a million gear changes the gearbox ECU says you need to look at your gear change actuator. If you are not having any trouble with the sensodrive gearbox, I would try a gearbox reset. It's in your owners manual.
WOW! A million gear changes in a Sensodrive gearbox and no actuator troubles?? I had clutch actuator troubles within 100Km of owning my C2! Have you owned the car from new?

[alex_alex]

Hi .
So I find problems abs .
It's bee poor contact abs sensor and I repair contact abs. And now it's work abs.

And now I it's another problems. It's stuck in ""Auto ""
I not can't put in ""N"" code P1795 Gearbox information Coherence

[alex_alex]

Hi Guys.
Please need help cod error P1795.
Stuck in ""Auto"" not can't put in ""N""
Last error cod.
Thanks

[ozvtr]

try a gearbox reset. It's in your owners manual.

Did you?

[GiveMeABreak]

Looks like you need a new gearbox actuator as it's reached the end of service life. According to the fault it has reached over 1 million cycles. A new one is just under £1200 excluding fitting.

Fault Code:	P1795
Description of Fault:	Gearbox counter information: Coherence. The number of engagements and disengagements of gears has exceeded 1000000 cycles.
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

[wheeler]

Before doing anything else with this you need to try carrying out a gear-change & clutch auctuator programming procedure with Lexia. When doing this it’s very important to have good battery support or the procedure may just keep failing. I would suggest having another running car connected with jump leads when doing it.
You may well find this sorts the issue.

[GiveMeABreak]

Often the clutch actuator can fail and the self adjustment system may not reset properly with a worn clutch, so are usually replaced with a new clutch at the same time given the labour involved. But in your case it is referring to the gearbox actuator. If the reset mentioned by Wheeler does not work, then it may be the brushes in the gearbox actuator that have worn.

Examination and further fault finding can be time consuming and costly though.

[alex_alex]

Hi Guys.
I another problems after I tried update gearbox after it's show me this Fault code P1702. Please

[alex_alex]

try a gearbox reset. It's in your owners manual.

Did you?

Exactly in manual following instructions and nothing chenge. no click. No clakt. No krik. nothing . Battery 14.3 V
Flashing ""Auto""". Not ""N"". Just tow ""- - "" and that's it.
Yes mate try restart gearbox. But after this show error
P1702.
I not understand I repair Uno broken other....
What happened..... why....
1.Clutch acurator new.
2.Selector gearbox secondhand it's very good... and my old selector gearbox it's very good..
3. Gearbox I chenge clutch 2000 mile just drive.
Thanks

2

[alex_alex]

Before doing anything else with this you need to try carrying out a gear-change & clutch auctuator programming procedure with Lexia. When doing this it’s very important to have good battery support or the procedure may just keep failing. I would suggest having another running car connected with jump leads when doing it.
You may well find this sorts the issue.

Exactly following procedure but not hellp. But i tried programming clutch acurator and gear box after did me error 1702. ECU Power Latch

[ozvtr]

You have no main battery voltage to the gearbox.
There is a fuse in the gearbox harness on the gearbox, labeled BMF1. It supplies power to the gearbox ECU directly from the battery. It might be blown. Or there is some problem in that main battery cable connection from the battery to the ECU. If the fuse is blown it is probably an overload from one of the actuators. Possibly a stuck motor or an actuator is jammed.

You have some other odd things there too. Like the ignition key position is invalid and the coolant temperature is 0'C?

The rest of the stuff just shows that the engine was not running at the time.

[alex_alex]

Hi Ozvr.
what GEARBOX ECU could I replace s122754011 b?
Thanks

[ozvtr]

Unfortunately I'm not sure. But I could only imagine that the difference is in the software and hardware revisions.
It runs on the CAN bus for either the CAN_VAN or all CAN BUS cars so I can't see why any functional ECU wouldn't work.
On the surface the ECU appears to be working as it is talking to LEXIA.
Did you check for the fuse in the wiring loom?

[alex_alex]

Unfortunately I'm not sure. But I could only imagine that the difference is in the software and hardware revisions.
It runs on the CAN bus for either the CAN_VAN or all CAN BUS cars so I can't see why any functional ECU wouldn't work.
On the surface the ECU appears to be working as it is talking to LEXIA.
Did you check for the fuse in the wiring loom?

Yes mate I check voltage to fuse. All ok.
I have 12 v to ECU GEARBOX. But not have voltage to
GEARBOX acurator.
When I reprogramming Lexia after did my error P1702.
Thanks

[ozvtr]

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.