How to check if computer is bad.


Asked by Jun 22, 2013 at 09:45 PM about the Jeep Cherokee

Question type: Maintenance & Repair

I have a 2000 Jeep Cherokee Sport with a 4.0 that when the engine temperature reaches 208 degrees the engine rpm jumps up to 2000 - 3000 rpms, hoping you all could tell me why.  Also, how do you check the computer to see if it's bad?
Thanks for any and all information received.

5 Answers

you have a temp sensor that is giving errant info...think on this car it is more than a coolant sensor, it must measure air temperature too...this device an ambient air sensor should be you check is with the OBD-II connector located three feet from your ignition switch...any autoparts store will read your codes for you or your could buy your own scanner for around twenty bucks~

2 of 2 people found this helpful.

kind of leaning towards a vacuum leak...may not be your ambient sensor...really need the diagnostics please~


I took it in and had it scanned, but it is not giving any codes so the scanner couldn't find anything.

2 of 2 people found this helpful.

you could start searching for a vacuum way is to use an unlit propane torch...hold it above the suspected leak and note the increase in rpms~ computers don't go bad...grounding and voltage to them goes bad~

3 of 3 people found this helpful.

the grounding to your ECM is tenuous at they saw fit to put the 300 amp requirement on the same bus as the delicate 750 Ma requirement...very bad...electronics are delicate...starters are power hogs....a "fuzzy" ground connection translates to varying voltages and varying amperages (fuzzy power) which creates failure conditions....fortunately a SOLID connection to ground with a NEW battery will make it all better~ (should, in my experience)

3 of 3 people found this helpful.

Your Answer


Looking for a Used Cherokee in your area?

CarGurus has 53,658 nationwide Cherokee listings starting at $8,495.


Jeep Cherokee Experts

  • #1
  • #2
    Daniel Guillen-Pizzorni
  • #3
View All

Related Models For Sale

Used Jeep Grand Cherokee
873 Great Deals out of 71,780 listings starting at $900
Used Jeep Wrangler
374 Great Deals out of 20,526 listings starting at $2,500
Used Jeep Compass
258 Great Deals out of 55,178 listings starting at $2,200
Used Jeep Wrangler Unlimited
597 Great Deals out of 64,378 listings starting at $7,900
Used Jeep Renegade
293 Great Deals out of 23,458 listings starting at $10,995
Used Jeep Patriot
401 Great Deals out of 13,893 listings starting at $2,495
Used Toyota 4Runner
344 Great Deals out of 29,288 listings starting at $1,500
Used Ford Escape
1,161 Great Deals out of 107,336 listings starting at $995
Used Ford Explorer
1,079 Great Deals out of 68,008 listings starting at $1,200
Used Jeep Liberty
147 Great Deals out of 7,049 listings starting at $999
Used Honda CR-V
700 Great Deals out of 63,126 listings starting at $1,495
Used Chevrolet Equinox
1,010 Great Deals out of 78,056 listings starting at $2,222
Used Toyota RAV4
618 Great Deals out of 61,608 listings starting at $1,995
Used Dodge Durango
271 Great Deals out of 24,913 listings starting at $1,500
Used Ford F-150
3,009 Great Deals out of 230,578 listings starting at $1,300

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.