speedo problem

[aliaz]

Hi! I'm new to Jeeps.

I'm working on a 2004 Wrangler. At some point, someone swapped in an older transfer case with a mechanical speedo output, which obviously won't connect, and is causing a check engine light.

How do I convert this to the proper electrical sensor?


Here is my transfer case tag:




Thanks!
Don

 

[SteelHeadz]

You can swap that mechanical unit with the electronic sensor unit. Make sure you clock it correctly in the hole.

 

[aliaz]

You can swap that mechanical unit with the electronic sensor unit. Make sure you clock it correctly in the hole.

Does this tag mean I have a 4.11 gear?

If so, I need a 37 tooth gear, right? Assuming a 32" diameter tire...

 

[captjanes]

Jeep Speedometer Gears at Morris 4x4 Center

according to this i would use 36 IMO hope this helps

 

[aliaz]

according to this i would use 36 IMO hope this helps

This Wrangler is a Rubicon. The link you provided says that these gears are not compatible with the Rubicon.

Is that because the transfer cases are different, or is the Rubicon ECU different? I'm hoping I can just swap in the proper gear and sensor since it is not a Rubicon transfer case and all will be good.

Thanks

 

[Bounty__Hunter]

That is not a Rubicon transfer case, you just need an electronic speed sensor like any other '04 Wrangler (non-Rubi) and the proper speedo gear.

 

[aliaz]

That is not a Rubicon transfer case, you just need an electronic speed sensor like any other '04 Wrangler (non-Rubi) and the proper speedo gear.

I know it isn't a Rubicon transfer case. What I want to know is if the output of the non-Rubi speed sensor is the same as the Rubi speed sensor. If not, I'll need to change my ECU, correct?

This Jeep used to be a rubicon, but somebody stripped it of the rubicon goodies and put in who knows what. The 241 transfer case is now a 231, and the locking differentials are gone.

I'm just trying to get it to work again.

Thanks

 

[JPNinPA]

This Jeep used to be a rubicon, but somebody stripped it of the rubicon goodies and put in who knows what.

Are you sure they didn't just put the decals onand call it a rubi?? Sounds odd to me to strip a Rubi down to a standard TJ.. Check you VIn number, There is a site that will show what your jeep came with from the factory.
Also if I recall correctly if your speedo gear is off a lot from another sensor that measures engine speed you will get a CEL.

If I find the link I attach it later..

 

[Bounty__Hunter]

The signal should be the same, but the wiring connector will likely be different. No need to change the ECU. If you buy a new speed sensor from the parts store it will also include the body side of the wiring connector so you have to cut and splice it in.

Can you post a pic of the connector on the body side of the speed sensor?

 

[aliaz]

Are you sure they didn't just put the decals onand call it a rubi?? Sounds odd to me to strip a Rubi down to a standard TJ.. Check you VIn number, There is a site that will show what your jeep came with from the factory.
Also if I recall correctly if your speedo gear is off a lot from another sensor that measures engine speed you will get a CEL.

If I find the link I attach it later..

Yep, I had the VIN verified today at the dealership. It shows it was an original rubicon, and at one time had a 241 transfer case.

It currently has a CEL on because the speedo isn't connected at all

 

[aliaz]

The signal should be the same, but the wiring connector will likely be different. No need to change the ECU. If you buy a new speed sensor from the parts store it will also include the body side of the wiring connector so you have to cut and splice it in.

Can you post a pic of the connector on the body side of the speed sensor?

I bought a speed sensor, it plugs right in to what is left of the broken body side connector. Luckily it came with a new body side connector to splice in

 

[Bounty__Hunter]

Good deal. The engine computer also uses the VSS signal input so there are some slight engine performance issues if there's no signal, hence the CEL.