JEEP CHEROKEE 2000

[gsune]

Hi. a guy from Freeems told me that if i take a log from my tooth wheel he can write a code for me but only in freeems
regards

[jsmcortina]

How does that help?

James

[jsmcortina]

Have you taken a composite log using the "log crank and cam" spark mode ?

I've re-read this topic and I'm still unclear on what the exact crank and cam patterns are.

James

[jsmcortina]

What variations are there on this pattern?

Seems the Jeep 2000 and 2002 use the same crank pattern ? (3 groups of 4 teeth 20 degrees apart)
The 2000 sounds like it has a single cam tooth - but where is it phased?
Do all models have a cam sensor?

Matt makes mention of one version using the same crank wheel but a distributor? Is this confirmed?

The 2002 has a typically awkward cam pattern that I have a diagram of.

I've been working on a preliminary decoder in MS3.

James

[Matt Cramer]

What variations are there on this pattern?

Seems the Jeep 2000 and 2002 use the same crank pattern ? (3 groups of 4 teeth 20 degrees apart)
The 2000 sounds like it has a single cam tooth - but where is it phased?
Do all models have a cam sensor?

Matt makes mention of one version using the same crank wheel but a distributor? Is this confirmed?

The 2002 has a typically awkward cam pattern that I have a diagram of.

I've been working on a preliminary decoder in MS3.

James

I believe they all have a single cam tooth and same crank pattern, whether it has a distributor (I have one of the distributors with a single cam tooth sitting around our shop; we had been considering making a trigger wheel for it but never did) or distributorless setup. This setup first appeared in 1991.

I was able to find some notes in Alldata on the cam phasing from 1992. The cam / distributor sensor is a 5 volt Hall effect. It transitions from 0 to 5 volts shortly before the #3 cylinder reaches TDC - it's not clear just how many degrees before this point, and there's some adjustability in the distributor. The sensor transitions back from 5 to 0 volts 180 cam degrees later, before cylinder 4 reaches TDC (like most inline sixes, it has a 1-5-3-6-2-4 firing order).

[jsmcortina]

By good luck that seems to match up with the wheel pattern I'd written for the JimStim long ago.

I have two wheel decoders ready for testing in MS3 pre1.1 alpha 8 Phasing will almost certainly be incorrect though.

James

[gsune]

Hi. i´m back
hi i would like to install my ms2 with the pattern of my jeep 4.0 flywheel. if you can help me telling me if the new code for ms2 supports it. and which would be the setting in tunerstudio. thank you very much

[jsmcortina]

It is an MS3 decoder. Not available on MS2.

James