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The biggest problem is that you're not sure you even need an MPEM.

Get a tool to depin the connectors, they're very cheap, and clean each pin individually. Do not cut the ends of unless they are nearly rotted right off

You've been given a lot of good advice here, good luck

Update, I bought a used ECU without key from eBay, and CanDooPro Home Edition. Replaced the ECU, used the CanDooPro to program my keys to it, the ski starts but refuses to idle, throws codes P1611 and P0608. I removed the idle bypass valve and it was corroded and probably not functioning which...

I called the dealer that looked at it last and they pulled the paperwork and said he remembered them looking at it. The service guy said they swapped an ECU onto it and the ski ran, so he was 99% sure the ECU needs to be replaced, cost $750 plus 1 or 1.5 hours labor= about $900-1000 with tax...

Could I use an ECU from a 2004 supercharged ski?? I can get one for $500 with the MPEM, ECU, and a programmed key

I cleaned all battery and ground connections. I then disconnect the positive lead on the starter and connected a spare positive cable to a good battery and engine ground, it cranks normal that way. Once the computer gets involved it cranks like in the video, almost starts, then the starter lets...

From the 2002 SeaDoo service Manual Resistance Test Disconnect the CPS plug connector from the wir- ing harness and check the resistance of the sensor itself. The resistance should be between 190 Ω and 290 Ω. Otherwise, replace the CPS. If resistance tests good, reconnect the CPS and disconnect...

https://www.youtube.com/watch?v=HDrlmFoSoSw

I said the cylinder bores were good. Engine was removed and milky oil completely removed from every part. Crankshaft was good, rods not bent, head looked good, injectors are spraying fuel, spark is good, compression is 130 on all cylinders, spark plugs are making spark.

I picked up a 2002 SeaDoo GTX 4 tec from a guy who got it from another guy. So the history was kind of unknown. The guy said that he bought it as a project and took it to the dealer for repair and they told him it had an engine with rusted cylinders and the ECU was bad. I brought it home and...