discontinued ecu / harness - JeepForum.com
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post #1 of 12 Old 09-18-2019, 10:52 AM Thread Starter
Mtexcursioner
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discontinued ecu / harness

My daughter's CRD WK keeps dying and leaving her stranded. After three attempts we finally have a diagnosis that makes sense. However, the solution per the dealer is replacing the ecu and wiring harness both of which are discontinued. He also says they won't reprogram a used ecu. Any suggestions that would keep it out of the scrapyard?

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post #2 of 12 Old 09-18-2019, 11:21 AM
jtec
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sounds like a shotgun diagnosis, new PCM/ECU and harness... We can try some second guessing and suggestions the questions may suggest a path to check out.

I am guessing-
The jeep dies, won;t restart. Anything to add?
What if any CODES were present or pending?
What is getting lost - injector pulse, fuel pump?

Jeep is stock, no programmers, chips, engine modifications, emission deletes, anything added or plugged in?

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 12 Old 09-18-2019, 12:30 PM Thread Starter
Mtexcursioner
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I had already wondered about the wiring harness being an issue as I had read that some other WK CRD owners had experienced something similar with damage near the battery area that caused the same problem. The codes would be all over the place i.e. all injectors, etc. GDE program otherwise stock.
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post #4 of 12 Old 09-18-2019, 02:13 PM
YouStupidBunny
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Could you provide more details beyond "keeps dying"?
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post #5 of 12 Old 09-18-2019, 02:18 PM
jediknight
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Maybe this is an option for you

https://www.aftermarketecushop.com/d...diesel-ecu-ecm



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post #6 of 12 Old 09-18-2019, 02:39 PM Thread Starter
Mtexcursioner
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engine stops running and she has to get off the road. Sometimes it will restart other times she's had it towed only for it to start later and do it all over again.
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post #7 of 12 Old 09-18-2019, 05:07 PM
jediknight
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Quote:
Originally Posted by Mtexcursioner View Post
engine stops running and she has to get off the road. Sometimes it will restart other times she's had it towed only for it to start later and do it all over again.


On the driver side, check the wiring harness that cross on top of the AC compressor line. It is between the battery and the engine. It is accessible from the top. Make sure this is not rubbing between each other.


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post #8 of 12 Old 09-18-2019, 09:41 PM
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Garage
yeah sounds like an intermitten short or loss of ground.
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post #9 of 12 Old 09-18-2019, 10:08 PM
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When does it stall? At idle? When on gas? On hot days? After driving a while? Details can help the forum offer suggestions.

Dealers are great at some things, but diagnosing beyond their scanners is often beyond their skill and patience level. When a dealer tells you the PCM is bad, it often means there are no stored codes and they are stumped.

With the limited information given, does this scenario accurately describe your stalling?
Usually fine with cold starts
Intermittent stalling after motor is warm/hot
Stalling occurs when coming to a stop or randomly at idle
Sometimes restarts after stall, but stalls again on gas
Restarting after cool down is usually fine

If that accurately describes the situation, look at your Crankshaft Position Sensor and Camshaft Position Sensor. Those sensors, especially the crankshaft position sensor is prone to heat damage and failure. When they are heat damaged, the problem usually starts with a random stall here and there, but progressively gets worse. Timing goes nuts, it stalls, and they don't always set or store codes.
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post #10 of 12 Old 09-20-2019, 09:48 PM
jediknight
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Quote:
Originally Posted by YouStupidBunny View Post
look at your Crankshaft Position Sensor and Camshaft Position Sensor. Those sensors, especially the crankshaft position sensor is prone to heat damage and failure. When they are heat damaged, the problem usually starts with a random stall here and there, but progressively gets worse. Timing goes nuts, it stalls, and they don't always set or store codes.

Good call!!



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post #11 of 12 Old 09-23-2019, 10:05 AM Thread Starter
Mtexcursioner
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Thanks for the help. I'll provide an update later on.
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post #12 of 12 Old 09-24-2019, 09:08 AM
02zedr2
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I had the same problem jeep would die about after running for 15 min, would and crank but no start, towed it home and fired right up, drive for 10 min and died again, literally like someone shut the engine off, towed it how again and it started right up. Scanned it and came back with crankshaft code, changed the sensor on the left hand side by the bell housing and haven't had a problem since
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