Hi, I bought a 2007 Peugeot 206 for my children who have recently got their driving licenses. The car worked fine for maybe a month but then from one day to another it wont start. It just cranks but nothing happens.
There is is no spark and the plugs are dry so it seems like no fuel is injected.
I have actually had exactly the same problem on our other Peugeot some years ago and in that case it was a broken wire between the ECU and the relay box. I believe its the same problem now but apparently not the same wire since they have not the same ECU and different wire colours. I have checked the voltage on the fuses and I have 12V on F4 and F8 but not on F15. I suspect that the relays dont get power from the ECU due to a broken wire. The problem is to know which wire. I find it very hard to check the wires since the holes in connector for the ECU are so narrow. I'm afraid to damage them if i put in a probe by force. I have tried from the back where the cables go in to the connectors but its hard to conform that I really have contact there since all wire colours change on their way to their relay box.
I have also made a readout with PP2000 and I had some fault codes but they have not showed up again after I erased them.
Does anyone know which wire trigger the relays? I found a wiring diagram in another thread but its not complete so I cant figure out which wire it is and to which connector it goes.
Can anyone suggest what to use as a probe for the ECU connectors to be able to measure resistance between ECU and relay box?
(The ECU is a Valeo J34P with two smaller and one larger connector)
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Sounds like an imobiliser fault ? Does the car ping when you try to start ? Can you hear the fuel pump working ? I am not certain just trying to help out seem like it could be something simple not as complicated as first thought.