Help

[Little Colin]

I need some advice please. I tried jump starting my 57 1.6 Ford focus and cross wired the leeds, realising I had done wrong with a big spark I took the cables off and went and brought a new battery. Car won't start at all ive checked my fuses and it says engine system fault. Have i broken it 

Cheers for any help Colin 

 

[Tdci-Peter]

2 hours ago, Little Colin said:

cross wired the leeds, realising I had done wrong with a big spark I took the cables off and went and brought a new battery. Car won't start at all ive checked my fuses and it says engine system fault. Have i broken it 

In theory, all car electronic systems are specified to withstand reverse voltage and over-voltage. But in practice, with all the interconnections in a car, things often do get damaged.

I assume you have checked the fuses in the engine bay fuse box as well as the passenger fusebox under the glove box.

You will need to run diagnostics on it, probably not just a standard OBD2 tester, as this may only read codes from the ECU. Systems like the Ford IDS, or the readily available Forscan will try to make contact with all the modules in the car.

Some bits must be working, just to get the systems fault light or message up.

But it could be quite a hard job locating a fault. It may need a specialist.