206 speed sensor - between a rock and a hard place

[xsaras4ever]

Hello to all.

We have done a major transplant between 2 Peugeot 206s.

Donor car is 2003 Peugeot 206 1.4 hdi, with aircon.

Receiving car is 2002 Peugeot 206 1.4 hdi , with sunroof, no aircon .

We changed everything - engine gearbox , bsi , ecu front struts - almost everything except the cars own wiring loom. We also have not moved the aircon over to the receiving car.

Now we are between a rock and a hard place.

PP2000 is giving faults on the airbags and brakes because of the speed sensor.

Here is the issue

1.) The receiving car used to have the sensor on the gearbox, the donor did not - we think it picks it up from the wheels.
2.) The little blue connectors to join the wiring on the struts (brakes etc) to the car wiring loom are different between cars.

We can think of three solutions -

Solution 1

If we change the cars wiring loom over from one car to the other (nice big job) we will solve the speed sensor problem but what about the different wiring to the radiator fan ? And what about the wiring for the sunroof ?

Solution 2

If we use the receiving cars older engine wiring loom it will have the wiring for the gearbox speed sensor, and we can fit a new speed sensor to the gearbox because it currently has a blanking plate - however , will it transmit correctly to the donor bsi/ecu combination ?

Solution 3

If we cut off the blue connectors and solder on compatible ones , what will happen ?


Any advice greatly appreciated.

[BX]

If at all possible keep the BSI and the ECU proper to the car body. Check that both cars used the same injection system and that both engines are the same e.g. 8hx. Use the engine wiring loom from the engine of the 2002 car. Your 2003 car most likely had abs and therefore no speed sensor as the abs system fed the speed signal. Keeping the ECU & BSI proper to the body and transplant the differential housing extension which contains the Speedo sensor and reduction gear should be the easiest. This unit is held on to the diff housing with 3 M6 bolts.
The next option is to do a complete transplant including wiring looms and abs braking system.
It may be possible to program out the references to the abs and to wire in a sensor. I do not know enough about the differences in the 2 cars to say how to go about modifying the wiring. There may be differences in the networking but as I never had to get into it on a 206 I really don't know.
Good luck.

[xsaras4ever]

Hello and thanks for the informative reply.

Unfortunately the 2002 car got flooded and all electrics were dead.

Therefore, we have to use the newer BSI and ECU.

The speed sensor is popped down into the diff housing by one allen/key type bolt. If we remove the blanking plate on the newer gearbox we can fit a speed sensor housing and if we use the 2002 engine wiring loom we can connect to that sensor.

But will it transmit properly to the bsi and dashboard ? However , its not a lot of work or expense so is probably worth doing.

If we change over the 2003 car wiring loom to the 2002 car we can use the speed sensor contained within the abs and then we have done an almost 100% transplant, except for the air-con. That leaves us with the issue of the radiator fan and the sunroof.

Underneath the BSI the 2002 car has an extra relay and the 2003 does not - can anyone say what this is for ?

The chances are that the non-sunroof 2003 car has the wiring in the loom for the sunroof anyway - we must check it soon.

We have swapped over all the interior , airbags , complete dashboard, door wiring looms etc, so basically we have only the original bodywork and glass, rear axle and car wiring loom. Not much.........

The reason for all this work was the 2002 car was never declared to the insurance so has a valid set of paperwork, whereas the 2003 car was declared a write-off - even though only very mildly damaged.

BTW : we have used PP2000 to successfully put the correct VIN on the BSI. Is the DAM stored anywhere ?

[BX]

As you say its not a big job to put in a sensor. However there might not be a reduction gear in there to drive it. That's why I suggested changing the little housing. When swapping a be gearbox with a speed sensor I used always change that unit so the Speedo would be correct.(The gearboxes didn't necessarily have come from the same model)
Unfortunately I cannot give you any help other than that. I have bought RTA manuals to sort out items like that and found their information very good. Generally they contain the original wiring diagrams and detailed information on all the sensors. However I know nothing about how the speed signal is handled on the different 206 models. There is a possibility that your 2003 has multiplexing such as CAN or VAN that isn't on the 2002 one but as I said I don't know.
I think you probably have a very good handle on what you're at and there is no point in me speculating about what might or might not be. Like myself you probably like to suck it and see.

[xsaras4ever]

Hello to all.

All problems now fixed and a very calm dashboard.

We changed all the wiring looms from the 2003 car to the 2002 car and changed and rebuilt the rear axle too.

We also moved over the ABS block and all the brake pipes (as they were different)

ABS light stayed on for about 1km but is now functioning properly.

Once again thanks to all