I dont know how to get trouble codes for my 1989 jeep cherokee 4.0L. how do i get the codes?

 

Your Jeep is using the RENIX system and it does not store codes like the 91 and later Chrysler system.

 

can you please tell me some info about the RENIX system. this is my first jeep.

 

Are you having any problems? You can use a multimeter to diagnose a lot of problems on the Renix XJs.

 

sometimes my jeep will turn over but not start until i wait a lil bit

 

You hear the pump run for a sec or two when you turn on the Ign? Key it on and off a few times, few secs on each time. Then try it.

When you look around the forum, remember last year of Renix was 90

https://www.cherokeeforum.com/f51/he...ix-links-1397/

http://www.greatlakesxj.com/tech.html < I think the 90 is close enough

 

If you've got a multi-meter, test the CPS output.

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 it’s mounting holes with the first drill bit that just won’t fit through the original holes. Then, when mounting it, hold the CPS down as close to the flywheel as you can while tightening the bolts.
　
Revised 11-29-2011