PCM Obituary

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08-13-2019, 09:46 AM

#16

alpine.adrenaline

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Join Date: Aug 2009

Location: 9000 ft, CO

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Year: 1999 XJ

Model: Cherokee

Engine: I6 4.0L

P0113 and P0118.
Thanks for your help with this. I feel like the solution is staring me right in the face so I appreciate the second set of eyes.

Last edited by alpine.adrenaline; 08-13-2019 at 12:10 PM.

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08-13-2019, 06:40 PM

#17

Dave51

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Join Date: Jan 2017

Location: Connecticut

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Year: 2000

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Dave51

I would just reset the CEL. I'll bet it will clear and stay clear.

Quote:

Originally Posted by alpine.adrenaline

I can clear the CE light with my OBDII reader and it blinks off, then immediately back on. I

Quote:

Originally Posted by alpine.adrenaline

P0113 and P0118.

Fortunately, I didn't bet a lot.

Quote:

Originally Posted by alpine.adrenaline

That's correct- With key on, I get 2.5v when probing the wire, whether the sensor is plugged in or not. I get 2.5v at the IAC and ECT pinouts (15 and 16) on the PCM whether or not the PCM harness is plugged in.

I think not getting 5 volts with the sensor unplugged is the killer. Any chance of borrowing a good PCM?

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08-20-2019, 11:00 AM

#18

alpine.adrenaline

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Year: 1999 XJ

Model: Cherokee

Engine: I6 4.0L

Yep, it was the PCM. Ordered another one from carcomputerexchange.com and after checking one more time for any shorts or lack of continuity at the PCM harness I plugged it in and it fired right up. I'm hoping that when they get my core they can tell me exactly what went wrong. It runs better now than it has for years, I think.

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Dave51 (08-20-2019)