[krissw]

Hi I have an Alto 2012 came out to start it this mornig.. notice that the fuel light didnt come on the dash and there is a yellow steering wheel with exclamation mark next to it on.. plugged in my ECB diagnostic tool.. no faults in the DTC . and then while it was still plugged noticed all the usual das lights on fuel etc... and it starts... when I unplug fuel light goes off but car still running! weird.. switch off car wont start again no fuel light lights showing etc.. but as soon as I plug the diagnostic device alll lights come on she starts and runs as normal.. any ideas? I have checked fuses.. all working non blown.. is it a relay fault and if so which one.. is it the relays in the engine bay or cabin

The only other thing I do have a Cobra alarm that was fitted professionally three years ago.. to operate doors as well set the alarm.. never had a problems with it before.. but wondered if that could be the fault?

Any ideas.. by the way I am retired mechanic..

 

[krissw]

You are losing the ground for the ECU, it is making circuit via the OBD tool..

thanks for the messages.. yes going to test all wiring now to find the suspect grounding fault might have to remove the clock to get at the wiring etc..