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Jeep Wrangler YJ
YJ General Discussion
Help with wiring harness
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<blockquote data-quote="Walt Jaquith" data-source="post: 426231" data-attributes="member: 18654"><p>You've got a fuel injected engine, and I believe I can see the plastic rail for the plugs for the injectors in the background. As long as there are six injector plugs you should have either a 4.0 or 4.2 EFI harness. I have heard that there are differences between them, but haven't seen anything to confirm it. The harness should cumulate in a large plug for the ECM. Did the ECM come with it? You'll need one, and they're getting hard to find.</p><p></p><p>I would download the <a href="https://wrangleryjforum.com/attachments/jeep-wrangler-yj-wiring-diagrams-pdf.115642/" target="_blank">YJ wiring diagrams</a> and start tracing some wires by their colors. That's a fast way to tell what connectors are supposed to go where, and you can match them up to components on the engine. On page 8W-75 there's a list of sensors, and that would be a good place to start. For instance, for the 4.0 the throttle position sensor has three wires; Black/Light Blue, Orange/Dark Blue, and Violet/White. Find a connector with wires that match that, tag it, and keep going. You'll need to be pretty familiar with all this to get it working.</p><p></p><p>Good luck. It's a big job, but the satifsaction when she finally runs is pretty cool.</p></blockquote><p></p>
[QUOTE="Walt Jaquith, post: 426231, member: 18654"] You've got a fuel injected engine, and I believe I can see the plastic rail for the plugs for the injectors in the background. As long as there are six injector plugs you should have either a 4.0 or 4.2 EFI harness. I have heard that there are differences between them, but haven't seen anything to confirm it. The harness should cumulate in a large plug for the ECM. Did the ECM come with it? You'll need one, and they're getting hard to find. I would download the [URL='https://wrangleryjforum.com/attachments/jeep-wrangler-yj-wiring-diagrams-pdf.115642/']YJ wiring diagrams[/URL] and start tracing some wires by their colors. That's a fast way to tell what connectors are supposed to go where, and you can match them up to components on the engine. On page 8W-75 there's a list of sensors, and that would be a good place to start. For instance, for the 4.0 the throttle position sensor has three wires; Black/Light Blue, Orange/Dark Blue, and Violet/White. Find a connector with wires that match that, tag it, and keep going. You'll need to be pretty familiar with all this to get it working. Good luck. It's a big job, but the satifsaction when she finally runs is pretty cool. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Help with wiring harness
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