How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Roy Your Own Question
Roy
Roy, ASE Certified Technician
Category: Nissan
Satisfied Customers: 5455
Experience:  Nissan Master technician
8127795
Type Your Nissan Question Here...
Roy is online now
A new question is answered every 9 seconds

how do i reset my computer on a 2002 nissan xterra

This answer was rated:

how do i reset my computer on a 2002 nissan xterra

ricardo hohl :

hi, welcome to J.A there are two ways to reset the ECU one is with a scanner looking up ecw options and the other is by disconnecting the negative side of the battery for 1 minute and reinstalling the negative back on , make sure all accessories are turn of before attempting a reset reboot procidure

JACUSTOMER-lthn51lv- :

Do you think that this will resolve the mileage problem that i have described?

ricardo hohl :

yes this will reset all factory values back to specs ,if everything is good

JACUSTOMER-lthn51lv- :

Orginaly it said that the person that was going to answer this was a lead tech at a Nissan Dealer . What happened to that person?

ricardo hohl :

sorry we are master certify and lead techs in all fields, not necessarily working at a dealer but on line as a technical assistance experts we also provide information and help to the dealers.

JACUSTOMER-lthn51lv- :

The reason I did not accept the answer is because when I initialy sent the information in with my situation I had listed everything that we had serviced recently , and that after our service our mileage dropped from 18 to 14 . I also asked about resetting the timing and what is the best procedure for the computer to re-learn . After that a 20 year lead tech at a Nissan Dealer said he would be answering my questions and then your name appeared .

ricardo hohl :

OK you don,t have to s]accept if you feel more confortable talking to a

ricardo hohl :

another expert that will be fine with me, you are a valuable customer and making you feel comfortable is our goal if you will like me to opt out i can do that , no offence taking

JACUSTOMER-lthn51lv- :

Thanks Ricardo.

ricardo hohl :

you are welcome., i am going to opt out just wait another expert will take the question sorry for the misunderstanding and good night. .

HI!

 

There is a special step to set your timing, you do not need to unhook your battery , try these steps to set timing and idle for base settings . Thanks let me know if you have

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here

Attachments are only available to registered users.

Register Here
any more questions, ROY!

Customer: replied 5 years ago.
Roy . Thanks . I do not have a timing light or a computer to read the codes . Do you think i should reset the ECU by disconnecting the battery and if yes . Is there a proper way to have the ECU relearn

HI!

 

I would make the base settings first with timing light with throttle switch disconnected , and set base idle then you can clear ECM by removing battery overnight , what I do is use a scan tool and reset it then also check fuel trim to see if you could have a fuel mixture problem, that can cause you mileage problem a scan tool is the best way to find a problem . you could have a weak 02 sensor or bad air flow meter, they should also be inspected , you can try your battery first and see if that will help . I hope this helps Thanks ROY!

Customer: replied 5 years ago.

Would my mileage be inconsistent with a weak O2 sensor?

yes a bad 02 sensor can cause poor mileage
Roy, ASE Certified Technician
Category: Nissan
Satisfied Customers: 5455
Experience: Nissan Master technician
Roy and 7 other Nissan Specialists are ready to help you
Customer: replied 5 years ago.

Roy . Thanks for your help

your welcome and good luck, ROY!

Related Nissan Questions