97 XJ engine RPM increase in conjunction with check engine light.

Craigabooey · Aug 25, 2010

Ok so i am driving my 97 XJ, 4.0 with auto tranny to work today and all of a sudden engine rpms increase from 2000rpm to around 3000rpm and the check engine light illuminates. Truck runs fine and drives fine. Did I lose overdrive? Any ideas?

Craig

kastein · Aug 25, 2010

What DTC codes? If you bring it to an auto parts store they can read them for you, write em down and post them here. Did the vehicle keep moving or feel like it was losing speed, or anything like that? Did it drive fine in lower gears or at lower speeds?

Craigabooey · Aug 26, 2010

Ok I got hold of a DRBII scan tool! The code is PO0705. Its listed in the book as Transmission Range Sensor Circuit Malfunction (PRNDL Input). Any takers?

joe_peters · Aug 26, 2010

That should be your NSS--it is the input to the TCU of the physical gear selected.

Search NSS*, plenty of information on NAXJA

for clean/lube/adjust.

97GreenXJ · Aug 26, 2010

I had to rebuild the NSS on my 97 a few days ago. It's a really simple process as long as you're careful while pulling the contacts and springs out... I would also suggest tying a piece of string to the plug when you remove the sensor so that you have something to pull it back into the engine compartment with...

Craigabooey · Aug 26, 2010

Ok looks like I will be rebuilding my NSS. That makes sense since i have had a couple of no start conditions which when I jiggle the shifter handle the truck starts, plus my reverse lights almost never come on....

joe_peters · Aug 26, 2010

Sounds like a plan, the code, the no-crank, the reverse lights, all NSS related.

JP Magazine article: http://www.jpmagazine.com/techartic...eep_cherokee_neutral_safety_switch/index.html

97 XJ engine RPM increase in conjunction with check engine light.

Craigabooey

NAXJA Forum User

kastein

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Craigabooey

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joe_peters

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97GreenXJ

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Craigabooey

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joe_peters

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