Originally Posted by
stevieturbo
the fuel pump will earth to the chassis. It absolutely will not run down the length of the car as a wire, and it absolutely will not be connected to the ISCV
There is no possible way a fuel pump can burn out an ecu, because it is not connected to the ecu. ( and only a very very very silly person would try and connect it directly to the ecu )
The ecu will trigger a relay, and this will provide 12v power to the pump when required, which will be wired down the length of the car.
thanks for the reply ive basically just had to re trace my steps as a process of elimination. the original wiring didnt go directly to earth from the pump it went up to the inertia cut out in the boot and then back into the loom into and around the back panal. to read a wiring diagram you have to no how to read them properly which i dont. looking at the diagram it does eventually go to earth but not directly. models with lamb sencors share the same earth. and also pins 19 and 1 which are earths that are bolted to the throttle cable bracket and solenoide perg valves cat model. you are correct it doesnt go to the icv on second look the wire crosses over but not teed to it. my main worry is now i didnt re earth this wire bit of a school boy error there. ive just sent the ecu to auto dynamix at newton abbot james worked for motor sport developments at blackpool for a long time running there workshop him and stuart are cosworth gods nobody no's anymore than them about sierra cosworths they started the original tunning scene back in the 90s. theres quite a big voltage drop when the starter motor is engaged . theres no resistance from the main earths to engine or chassis so im fuked if i no could possably be engine loom there five hundred quid. so its beyond me . jamie lamb proffesional auto electrian is coming out early new year