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Jeep Wrangler JK
JK General Discussion
Replacing ECU
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<blockquote data-quote="WestCoastDan" data-source="post: 463484" data-attributes="member: 23120"><p>When purchasing a replacement ECU, they require the VIN to "program" it correctly.</p><p>I assume this means to get all of the settings for things such as lights, door locks, etc. that may be different from another model.</p><p></p><p>I gave them my VIN and confirmed it, then placed my order.</p><p></p><p>"New" ECU arrived today and I began what I expected to be an easy 1,2,3-type swap; disconnect battery, remove aux relay box to access the ECU connections, then do a quick R&R on the ECU, relay box, and battery connections.</p><p>Everything went as expected up to this point, then I started the vehicle.</p><p></p><p>It ran smoothly for about 5-10 seconds then stalled.</p><p>I started it again w/ the same result.</p><p>I repeated this effort maybe 10 times, all stalling after a few seconds as if the key wasn't programmed or the power was cut.</p><p></p><p>I decided to try the OBDII reader and my JSCAN program to check for codes.</p><p></p><p>Now my JSCAN license does not recognize the new ECU and I cannot perform the diagnostics.</p><p>In addition, when I tried to restart the vehicle, I get NOTHING. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3996" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3996" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3996" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3996" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3996" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /> </p><p></p><p>This Jeep is really getting on my LAST nerve.</p></blockquote><p></p>
[QUOTE="WestCoastDan, post: 463484, member: 23120"] When purchasing a replacement ECU, they require the VIN to "program" it correctly. I assume this means to get all of the settings for things such as lights, door locks, etc. that may be different from another model. I gave them my VIN and confirmed it, then placed my order. "New" ECU arrived today and I began what I expected to be an easy 1,2,3-type swap; disconnect battery, remove aux relay box to access the ECU connections, then do a quick R&R on the ECU, relay box, and battery connections. Everything went as expected up to this point, then I started the vehicle. It ran smoothly for about 5-10 seconds then stalled. I started it again w/ the same result. I repeated this effort maybe 10 times, all stalling after a few seconds as if the key wasn't programmed or the power was cut. I decided to try the OBDII reader and my JSCAN program to check for codes. Now my JSCAN license does not recognize the new ECU and I cannot perform the diagnostics. In addition, when I tried to restart the vehicle, I get NOTHING. :mad: :mad: :mad: :mad: :mad: This Jeep is really getting on my LAST nerve. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Replacing ECU
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