Ok, I just changed the ecu in my car back to a p72. I originally had a p28 ecu w/ an obd2 to obd1 conversion harness. So when I put the p72 back in, it gave me an engine checklight code 54 CKF - crank fluctuation sensor. I know that the p28 doesn't mean the sensor hooked up so where exactly is this sensor so I can hook it back up? Can anybody take pics to show me?

 

Ok, where does the crank fluctuation sensor plug into? I think I found the plug and its unplugged but i can't find any spot to plug it in.

 

i'm not too good w/ obd2 stuff, so excuse me, but crank sensors are normally magnetic (or hall effect) sensors located on the crank pulley or in the distributor. check in those too spots, if all else fails, call a dealer and ask where its located.