When you say the you have a short circuit at the fuses do you mean they are both blown? I had a look at the wiring diagrams for the 206 MUX and it is a bit surprising both brake light fuses are blown. They are separate circuits. The most likely way this would happen is if the cable to the back of the car was damaged. Are there any problems with the tail lights. I doubt this is related to your ECU problem.
I have attached two diagrams for your car. The first is the synopsis for the injection. The second shows the connection between the engine fuse box and the ECU. When you turn the ignition on the engine ECU closes a relay (master relay) in the Engine fuse box. This relay then provides the main power supply to the ECU. I have known this relay to fail and if that happens it quite likely that PP2000 will not be able to communicate with the ECU.
You need to do some voltage measurement at the engine fuse box. You need to find the black 16 pin plug and push the red probe in the back of pin 13 and the black probe needs to touch an unpainted part of the car body. When the ignition is OFF you should read 12V and when the ignition is ON you should read 0V. It would be worth repeating the test at pin 8. It should be 0V with the ignition OFF and 12V with the ignition ON.
A couple of things from you diagnostic results:
(i) The car can have up to 5 keys. The synchronisation tell you the remote buttons have been pressed on one of the five key recently. No for all five is normal.
(ii) Do you still have a Peugeot radio?
One final question does the car crank? The starter motor is not connected to the ECU so the car should still crank.
Hello Ian,
Thanks for looking with me to this problem.
Right now.. I unplugged the wires from the BSI and looked for physical burns or damage on it.( it doesn’t seem like it got real damaged. I didn’t looked inside. Monday I will hook it back in the car again and start continue to the wires and voltages.
The fuses of the brakes 21 and 20 were not blown, I was just measuring the voltage on them.. and it seemed they were grounded when measuring them, while the other fusses one the board had voltage on them. I think it was my misinterpretation of the relay.. I think it will show voltage when I push the break switch of course..(my fault of interpretation) I think for those two fuses.
As answering your questions.. 1* yes.. the car cranks around and for the rest I cant see any wrongs on the car… 2* The original radio I took out on the moment I bought the car years back to replace it with a aftermarket radio (that’s why PP2000 doesnt shows the radio).
On Monday I’m going to get on with the car and hook the BSI back into the car and start measuring more wires as you suggested on the fuse box (now I have a diagram.. thanks for that!). Today I got also a hand on the software Autodata 3.45, but again this software only shows the numbers on the wires as plugs and not the wires as colors so. In this way I have to start first every time at the base to figure out what goes where, before excluding (but I have the time)..
Also what I noticed.. is when the car was starting before this all happened.. On switching the contact to on, I could always hear the fuel pump make a bzzzzz sound to pump the fuel to the engine. It must be the ECU what is not working now, that it doesn’t give the command to the pump now. (anyway.. its just a little detail).
I will start continue the search Monday again.. and take your points with it.
Greetings
