How to check if computer is bad.

10

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 replaced...how 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 out of 2 people think this is helpful.

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

10

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

1 out of 1 people think this is helpful.

you could start searching for a vacuum leak...one 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 out of 3 people think this is helpful.

the grounding to your ECM is tenuous at best...as 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 out of 3 people think this is helpful.

Your Answer

Add photo

Related Questions

Cherokee

Looking for a Used Cherokee in your area?

CarGurus has 59,550 nationwide Cherokee listings starting at $2,500.

ZIP:

Search Jeep Cherokee Questions

Jeep Cherokee Experts

#1 swtcat13
swtcat13
Reputation 1,340
#2 Daniel Guillen-Pizzorni
Daniel Guillen-Pizzorni
Reputation 1,290
#3 Luis660399
Luis660399
Reputation 1,130
View All

Related Models For Sale

Used Jeep Grand Cherokee
1,046 Great Deals out of 74,229 listings starting at $950
Used Jeep Wrangler
275 Great Deals out of 18,614 listings starting at $2,995
Used Jeep Compass
253 Great Deals out of 20,509 listings starting at $2,400
Used Jeep Wrangler Unlimited
307 Great Deals out of 45,597 listings starting at $9,990
Used Jeep Patriot
339 Great Deals out of 27,567 listings starting at $2,500
Used Jeep Renegade
143 Great Deals out of 25,499 listings starting at $11,659
Used Toyota 4Runner
281 Great Deals out of 20,895 listings starting at $1,995
Used Jeep Liberty
254 Great Deals out of 7,338 listings starting at $990
Used Ford Escape
1,347 Great Deals out of 95,801 listings starting at $995
Used Ford Explorer
832 Great Deals out of 75,042 listings starting at $1,200
Used Ford F-150
2,255 Great Deals out of 209,705 listings starting at $1,499
Used Honda CR-V
822 Great Deals out of 60,379 listings starting at $900
Used Dodge Charger
285 Great Deals out of 27,348 listings starting at $2,250
Used Jeep Commander
73 Great Deals out of 1,697 listings starting at $3,300
Used Toyota RAV4
644 Great Deals out of 70,828 listings starting at $2,350