2000 4.7 died on freeway on got day/Vents not blowing - JeepForum.com
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post #1 of 6 Old 06-19-2019, 03:41 PM Thread Starter
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2000 4.7 died on freeway on got day/Vents not blowing

I know there are many posts on this issue...the electrical gremlins with the WJ. I have read about issues of stalling gauges going crazy and other electrical anomalies. I have done my due diligence but I thought I would also include my specific situation and see what you guys had to say.
about a month ago I bought a 2000 grand Cherokee limited with 112000 miles on it and it's super clean and ran perfectly up until the time I took it to my mechanic for a post-purchase once-over. he called me that afternoon and said everything looks great except when they took it on a test drive on the freeway it completely died it would then turn over but not fire up. he ran some diagnostics and did some research online and ultimately decided on replacing the crank position sensor. He then took it for a test drive about twice as far as the first time and it made it all the way back to within a block of the shop and then died again.
At this point the vents also stopped blowing air and a couple of the vent position lights would not light up on the dash.
I have read about replacing the PCM the camshaft position sensor cutting down the torque screws on the PCM and many other potential fixes for this issue.
I was able to pick up the Jeep the next morning and it started right up and has been drive perfectly however I have not taken it on a freeway run longer than a couple miles and the temperature has cooled down. On that note the day it was at the mechanic it was over a hundred degrees here in Northern California.
Here are my questions.

These are the questions that I have.

1. Does the fact that the vents stopped blowing around the same time offer any clues to the issue?
2. I realized that the day I dropped it off at the mechanic I just gave him my key and not the fob. Would this cause any potential issues with the sentry key system?
3. If you are me what would the next step be you would take? There is an independent shop here in town with a really good reputation for having skilled mechanics would you start their or with the more DIY solutions?

Thanks for any help I appreciate it, Matt

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post #2 of 6 Old 06-19-2019, 04:35 PM
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YOU HAVE not mentioned anything about the shop scanning and finding any codes.

I am guessing the system is AZC - see attachment - we can run a self diagnostics on this system. see attachment for HVAC controller types.

use this link scroll down to self diagnostic mode and do test.
Attached Images

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 6 Old 06-19-2019, 05:10 PM Thread Starter
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Thanks for the self diagnosis link. I will post any codes soon.
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post #4 of 6 Old 06-21-2019, 01:22 PM Thread Starter
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Here are the AZC codes that came up after doing the self diagnosis.


The obd scanner showed no codes.

Does this help with understanding the problem.

Thanks, Matt
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post #5 of 6 Old 06-21-2019, 03:31 PM
2004 WJ 
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I would re-calibrate the AZC, then run diagnostics one more time.

2004 Jeep Overland WJ 4.7 H.O. (Bought new in Oct 2003)
2014 Jeep Overland WK2 5.7 Hemi (Bought used in 2016 w/7k miles)
1970 Ford Mustang Boss 302 (in Family since 1974)
2013 Ford Mustang Boss 302
2011 BMW 328i
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post #6 of 6 Old 06-21-2019, 04:16 PM
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the duel zone HVAC re-calibrates every 20 key cycles, the reason why it breaks the blend doors off!
have you done the key on/off 3 times to get any codes displayed up on the dash where the mileage usually is? sometimes shows more than a simple code reader.
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