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Hi, I am new to the forum, and this is my first post. I have a 2004 ztw with a 2.3 that I had in the shop. The tech found a p2557 code and, replaced the smog pump fuse. The cel went away then returned the next day. I checked the fuse, relay, and solenoid... all good. How can I check voltage at the pump harness if the system may or may not be engaged. I don't want to change the pump for the heck of it, its pretty pricey. Thanks.
 

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BodyKits=PantiesDrop
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13,168 Posts
I have an extra one from my 04 that I don't need...
 
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