fault code 01257 isv help

[jonnaz]

hello

i get the 01257 fault code which is to do with the ISV. its Either:

1. A short circuit to +ve in N71 (ISV) or in the cable between N71 and contact 4 of the ECU.

2. A short circiut to earth in N71 or between N71 and ECU

3. fuse #24 faulty

4. open circuit in wiring


The ISV is new so i doubt it will be a fault with that and fuse 24 is fine i have changed it to make sure.

Is there an easy way to check the wiring for the ISV circuit? any tests i can do?

all help apriciated

Thanks

[jonnaz]

also i had an ecu that fried in the car i dont know why i left a diagnostic machine plugged in and maby the ignition on over night could be the cause it had been remapped last year. i have got a new ecu and i want to put the cips in out of the broken one. will this be ok or could it be the chips that caused the problem?

[jonnaz]

01257 code cleared and not appearing now, but im getting 0533 now.