C191

C191 plug and injector wiring

The C191 is a connector on the engine loom of Motronic 1.3 cars. It allows you to disconnect the wiring to the fuel injectors without having to remove the entire loom.

It is located underneath the intake manifold, and is a known water trap. The resulting corrosion of the wires leads to mis-fuelling, either to failure of the injectors or lack of data from the temperature sensor to the ECU.

If your C191 has rotted away, it is acceptable to cut it out and join the two halves of the loom together to cure the problem.

Pin	Colour	Circuit	To	Image
1	Brown/Red	Coolant Temperature Sensor	ECU pin 45
2	Brown/Orange	Coolant Temperature Sensor	Ground G103
3	Brown or Brown/Yellow	Coolant Temperature Sender	Ground G200
4	Brown/Violet	Coolant Temperature Sender
5	Red/White	Fuel Injectors	DME relay
6	Brown/White	Fuel Injectors 1, 3, 5	ECU pin 16
7	Brown/Yellow	Fuel Injectors 2, 4, 6	ECU pin 17