Sensodrive Gearbox ECU, no power.

Hi
My C3 sensodrive has problem.
Lexia gives fault: Gearbox, no power supply.
It also shows voltage 0,0V.
Fuses ok, what next?

Teme wrote: ↑Thu Jun 02, 2022 11:00 am Hi
My C3 sensodrive has problem.
Lexia gives fault: Gearbox, no power supply.
It also shows voltage 0,0V.
Fuses ok, what next?

Hi

Check the fuse F4 10A in the BSM for continuity.

Look for 12v at the sensodrive ECU would be a good start.

Depending on the presence of the supply voltage you can work from there - forwards to the ECU or backwards to the BSM module.


What is the history of the car, as in, what happened before the fault.

How does the car behave, can it start. does it run? Tell us what you found and did before connecting lexia

Hi

I just bought this car.
According previous owner, after start of slippery (isy) surface, indicator in dashboard went to (-) and.
After stop of engine, didn't start anymore.
Lexia shows P0560 and car does not start.
Fuses I have measured, so at least at fuse voltage is.

What is good place to get/buy repair manual with electrical diagrams?

Teme wrote: ↑Fri Jun 03, 2022 10:05 am Hi

I just bought this car.
According previous owner, after start of slippery (isy) surface, indicator in dashboard went to (-) and.
After stop of engine, didn't start anymore.
Lexia shows P0560 and car does not start.
Fuses I have measured, so at least at fuse voltage is.

What is good place to get/buy repair manual with electrical diagrams?

Buying a broken C3 is really not worth the effort. There are still good runners that a broken ECU one is worth very little. Some people have access to many donors to swap parts over, but, if you are not in that position it may be better to sell the broken one on and get a working one.

The first place for diagrams is haynes manual but they are limited and quite generic. Good for basic faults but your P0560 makes it look very much like a bad ECU/BSM. Without a running engine it won't be possible to check the voltage from alternator and this risks damaging any replacement parts you fit.

I boungt this 2003 one with 200€.
I'll going to get it running, lets see what happens

If you have lexia installed on your laptop, also install SEDRE for the diagrams you need. You will need to find SEDRE with google, but Lexia and SEDRE go well together.

There is a fuse in the wiring loom on the gearbox. Not sure but I think you might have to undo the tape on the loom to get to it.

If that fuse has blown you will need to find out why. It would most likely be one of the three actuator motors or damage to the wiring loom on the gearbox.

The gear selector actuator tends to be reliable but the clutch actuator can be exposed to water and salt. There are a lot of videos on Youtube about pulling the actuator apart and re-greasing it. That's where I would start.

Another thing is thinking about changing the clutch. If you don't know the history of the car then you wont know how good the clutch is. That wont have anything to do with your current problem, just something to think about.

You can by-pass the sensodrive inter lock and start the engine.

https://www.youtube.com/watch?v=mcV_vLEJLDo


Make sure the ignition is on and the gearbox is in neutral. DO NOT TRY THIS IF THE GEARBOX IS STUCK IN GEAR!!!!!! You can use a spanner on the gear shift actuator output arm to get the gearbox into neutral.