crankshaft position sensor reluctor (tripper wheel)

[heavy equipment]

I want to modify the ckp on my grandson's '89 Cherokee to get it closer to the reluctor (tripper wheel). I don't have a reluctor out where I can measure it. Can someone get me the outside diameter? I've read the articles about enlarging the mounting holes on the ckp, but I want to make sure the reluctor doesn't knock it off.

Thanks for any suggestions.

[SilverXJ]

Why?

[heavy equipment]

I've read on at least one of the Jeep forums that the sensor that gives intermittent problems can be improved by moving it closer to the reluctor. I want to try it, but I don't want to break it. I want to measure and calculate the smallest distance between the sensor and the reluctor wheel that will avoid interference.

[cruiser54]

Renix CPS Testing and Adjusting



Renix CPSs have to put out a strong enough signal to the ECU so that it will provide spark.

Most tests for the CPS suggest checking it for an ohms value. This is unreliable and can cause some wasted time and aggravation in your diagnosis of a no-start issue as the CPS will test good when in fact it is bad.

The problem with the ohms test is you can have the correct amount of resistance through the CPS but it isn’t generating enough voltage to trigger the ECU to provide spark.

Unplug the harness connector from the CPS. Using your voltmeter set on AC volts and probing both wires in the connector going to the CPS, crank the engine over. It won’t start with the CPS disconnected.

You should get a reading of .5 AC volts.

If you are down in the .35 AC volts range or lower on your meter reading, you can have intermittent crank/no-start conditions from your Renix Jeep. Some NEW CPSs (from the big box parts stores) have registered only .2 AC volts while reading the proper resistance!! That’s a definite no-start condition. Best to buy your CPS from Napa or the dealer.

Sometimes on a manual transmission equipped Renix Jeep there is an accumulation of debris on the tip of the CPS. It’s worn off clutch material and since the CPS is a magnet, the metal sticks to the tip of the CPS causing a reduced voltage signal. You MAY get by with cleaning the tip of the CPS off.

A little trick for increasing the output of your CPS is to drill out the upper mounting hole to 3/8” from the stock 5/16”, or slot it so the CPS bracket rests on the bell housing when pushed down. Then, when mounting it, hold the CPS down as close to the flywheel as you can while tightening the bolts.




Revised 01-26-2013