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Discussion Starter #1
I recently did a gas motor swap in a 09 smart passion. Motor is the same as the original that was in the car. I hooked up the harness to the engine on the engine stand. After installing the motor and trans I have one electrical plug from the engine harness with no home. It's a 4 wire plug. I also get a p0108 and p0110. Map/iat sensor is plugged in and I swapped it with another but same codes come up. When I clear the codes the p0108 will not clear. I tried to plug the map into the mysterious 4 wire plug but won't fit. Do these cars have a maf? The plug is on the opposite side of the map sensor. I looked at wiring diagrams for all the gas model 451 and this plug doesn't seem to exist. The wire colors are yellow/black, green/black, black, brown/black. Any help would be greatly appreciated.
 

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Just last night finished an engine swap, almost forgot one of the O2 sensors? Get a picture up maybe I can help as it's fresh in my mind, for a day or so.
 

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Discussion Starter #5
I think I have to get more posts under my belt before I can post pics. Or maybe it's just my phone. Anywho the plug looks just like the iat/map sensor plug.
 

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After driving for a bit my battery light came on.... Bingo!!! The mysterious plug goes to the alternator. Just gotta let the engine cool and I will route it over to the alternator.
 
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