Nissan came in poor idle cutting out since motorway thrash. Cleaned idle control valve and checked adjustment of throttle switch. still no better. found an air bypass screw which got us a reasonable idle it idled with the switch/potentiometer disconnected. however fan didnt cut in and mil light now flashing which it didnt before to be fair . Customer says that these faults were not present when he brought it in! fan is ecu controlled . run flash code and it gives 14 long flashes and 3 short which according to the table is code 143 but i cant find 143 listed anywhere. it will clear using the proceedure but comes back within 5 mins.
What i want is to identify this code and then i can tell this guy where to get off. he is acusing us of blowing the ecu cos he saw us with a power probe which i hasten to add was used only to power the fanup not introduce a live into the ecu. people like this guy make me want to shut the doors and hang up my spanners! Anyway any help would be great here.

thanks

are you sure you are reading the flashes correctly
as far as we know all codes are two digits
code 43 is throttle position sensor/circuit which could tie in with what has been done HTH

Hi Mark, as far as i can tell yes, it definatelly flashes 14 long and then 3 short, i have done it so many times now i begin to doubt myself, dealer cant help except a proper read with their equipment, owner has been explained to and happy for dealer to read it. it clears easilly but as soon as this click comes from behind glovebox after switching off it comes back. will leave for dealer to have a shufty

Hi

Not sure what engine you have here, but I have found these Nissans can leak coolant into the ISCV from the throttle body, this then shorts back to the ECU. In extreme cases it blows the 10amp ECU battery feed.

Hope this helps

Simon