CJ7365

Already replaced Coolant Temp Sensor, and verified Ohms reading sensor is good. I am also receiving the 5 volts from the PCM


Engine runs, but still have CEL with code 22


Looking for suggestions

ehall

you can see if the computer is getting any data by hooking up a scanner that is compatible with the old MOPAR OBDI diagnostics

might be a dirty connector at the PCM, but I would check to see if the computer is getting any data first

CJ7365

Ok, I will disconnect the connector to the PCM and clean the connectors.


Where would the OBD I scanner connector be, and what does it look like

madmanmarty

did u disconnect the battery to clear the code?

CJ7365

Yes, just came in from, checking continuity from sensor connector and PCM connector 2 and 4, tests good.


Also I have another PCM that I switched out and same problem.


I am pretty much stumped.


Jeep starts up, but still have code 22 after resetting battery.


Jeep runs good, but wont idle down for about 3 seconds, obvious because of the ECS.




still looking for suggestions

CJ7365

Just for the sake of it, got another Coolant temp sensor, all is fine, just goes to show you, just because its new, does not mean it works.


thanks for all the suggestions

ehall

IIRC its in the engine bay next to the brake booster

madmanmarty

CJ,out of curiosity what brand did you buy both times?

CJ7365

The first one was the AZ brand Duralast.

Then the last one was from Oriellys, I believe masterpro

I haven't taken the first one back AZ yet

madmanmarty

Thanks that's what I thought.
For sensors the way to go is OEM.
I had a problem until I got the mopar brand.

CJ7365

I did a continuity check on the AZ duralast sensor, and there are 2 pin on the sensor and one of them had continuity to the outside housing of the sensor.


When I got the new sensor, there was no continuity on either pin to the housing sensor.


The Autozone sensor did check out on the right ohm for temp reading, and that is what was confusing the hell out of me, It basically forced me to check the wiring to the PCM along with cleaning the PCM connector.


But all is well, at least shes running good now.

madmanmarty

Glad to hear your old '94 is good to go.

ehall

MOPAR or Standard brands, rockauto.com sells both. House brands are a waste of time and money.