Get OBD readings using key

[MarksmanAkula]

I've read about it before on here, but I cant seem to remember how to get codes to show up using just they key.

Isn't it true that the key method will sometimes display codes a scanner may not?

 

[XWrench3]

the key method worked on the original obd systems. but i dont know if that works anymore. in order to use it it was turn the ignition key on and off something like 5 times in rapid succession, ending in key on. i used it a lot in our old dodge neon. but that system was not always error free. on one occasion, it said the car needed a tps, when in reality it just had a bad plug wire. that was an expensive plug wire!

 

[Billwill]

It stopped working from the 2005 KJs I believe.

XRench3 can try it on his 2005 KJ.

Without starting the engine, rapidly turn the ignition ON/OFF 3 times.

After the last ON action leave the ignition ON and the Odometer display will show stored codes from the oldest to the latest.

You cannot erase codes using the KEY method but the last few codes can be investigated...the first codes to roll out could be ancient and no longer valid.

The Export Models such as I have seem to need 4 ON/OFF actions...I will check to see if 3 actions work on my 2002 Export CRD!

My Jeep uses only PCI Bus and even the local Bosch agents cannot pull codes or erase codes...only the Dealers with their DBIII readers can do so.

You guys with newer Jeeps should find a code reader that works on your Jeep and make use of it!

Yesterday my Jeep "Pinged" at me and died. I pulled out my Laptop which I always carry with me...pulled the last codes using the KEY method which pointed to the Oil Pressure Sensor according to the codes I have stored on my Laptop along with the 2002 Service Manuals, Tools, a big hat and a Multi-meter.

I topped up with oil...which I always carry with me and Jeep seems OK!

This old girl KJ of mine does burn oil and leaks a bit....fortunately the Owner does not leak yet!

 

[MarksmanAkula]

Does anyone have a good reader that works with Jeep’s? I have one, but it’s just a basic run of the mill engine code puller and such

 

[tommudd]

05s still work, at least it does on my 05, after that, NOPE

 

[Billwill]

05s still work, at least it does on my 05, after that, NOPE

Thanks for clearing that up....Now we know that 2006 onwards you definitely need a good reader.

 

[lfhoward]

I pull codes for my 08 from my Scangauge II, which is always there.

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Old pic!!! I now have 174K on the odometer!!

 

[LibertyTC]

A few of us have the less expensive ScanGauge copy.
Autel ****-Trip which works well for code reading/clearing & Viewing Gauges through the OBD2.

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[Jeremy-WI]

I bought one of those elm327 devices on amazon years ago and use my smartphone with torque pro app to read codes. I have an old auto xray scantool but I have never used it on my 06 KJ