jxhxb

well my sisters car is an 02 civic ex coupe and weve had problems with it turning itself off randomly and we had to replace her battery just because it was old and warn out and we took it to get it smogged and it failed because they said it needs a drive cycle done to it?? so she looked up all the drive cycles and the dealership printed them out for her and seh tried them NUMEROUS times and they didnt work...... so is there a way the dealership can just like trip her ecu so it says a drive cycle was performed?? i dont see why anyone would haveto do that after they change their battery??

and also we were thinking about replacing her ecu because we're thinking that might be the cutout issue with her car turning off...but what ecu does she have? its an automatic by the way

thanks for the help

HONDAPARTSMANMIKE

well anytime you disconnect the battery or clear the cel it will restet your monitors and they willhave to reset themselves. it usually takes a few drive cycles anywhere from 50-100 mile of drivin. i would check your backup fuse and make sure its good. no sure which one it is. if its bad monitpr will never set.

the dealer cant do anything other than drive it and get the monitor to pass and also check the back up fuse. there a tool you can buy it cost about 80 buck that plugs into the dlc and will beep when monitor are set

jxhxb

what fuse am i looking for tho? is it called the backup fuse?

jxhxb

fuse is fine...

whats the ecu that runs these??? i think she has a bad ecu because her car is always shutting itself off and we already changed the ignition switch. her battery..etc

Psda

If the primary electrical system including battery and alternator are not working properly voltage can drop enough that an engine will stop. But if you can restart the car immediately then those components are probably good. The thing is if you do not drive a car regularly without the lights and heater on the battery will never become completely charged. So start by attaching a battery charger overnight and check the terminal voltage of the battery. It has to be above 12.2 volts.

It is extremely unlikely that the engine control computer would randomly shut off the car like that without showing errors in live data and trying to set codes that could be observed while the car was still running..

​​​​If the battery is fully charged that is above 12.2 volts in the morning before you start the car, my guess is that there is probably a bad electrical connection in your primary electrical system, at the battery the main grounds or to the ECU. This can happen with a combination of flexure and corrosion where the cable meets its crimp on terminal.

Check those cables by flexing them near their connectors with the engine running.before jumping into replacing the ECU. If I'm right when you flex the cable the engine will stop. If that doesn't do it then if that car is worth more than $2,000, I would consider taking it to a diagnostic tech rather than a dealership's auto mechanics