MPEM Test....
Yes, the mpem (multi-purpose electronic module) is similar to the power pack of an outboard. It has several more functions than the power pack but it’s similar. Years ago, we would refer to these components as the “brain” of our motors. The mpem receives its current from the battery. Its functions include the rev limiter, an integrated delay timer, which cuts off the power after 33 seconds of non use when the lanyard cap has been installed. It interprets and distributes information to the control features of the engine.
The primary cause of burning the 5 amp fuse normally means the starter solenoid is bad.
One more thing. You’ve not described any beeps from your DESS (digital electronic security system) lanyard when placing on your post. With a good battery, when you put the lanyard cap on your post, you should hear 2 short beeps. This means all is well and the engine is ready to start. If you don’t hear any beeps, then you may have a DESS problem. This lanyard cap has a ROM chip in it which is essentially an encrypted key for your specific PWC. This protects it from theft. If the mpem is bad, when placing the cap on the post, you should hear 8 short beeps. If you’re the original owner, then do you remember the beeps when it ran?
You can jump across the solenoid and turn the engine over all day long, but the mpem will keep it from starting if your lanyard cap or post is bad.
With the battery fully charged and you put on the lanyard cap, do you hear anything?.........if not, then this is really where we should be starting from. But the test parameters for the mpem are to follow, so go ahead and check it too.
Here is a list of results you should get from testing your mpem on the 717cc rotax. Make sure you have all the wires completely disconnected or damage to your meter can occur.
METER + ...........................METER - ................................Value
RED........................................RED........................................< 1 OHM
(ring terminal)......................(female terminal)
RED....................................RED/PURPLE.................................< 1 OHM
(ring terminal)......................(female terminal)
RED.......................................BLACK......................................> 20K OHM
(ring terminal)......................(ring terminal)
BLACK/RED..............................BLACK.....................................> 10K OHM
........................................(ring terminal)
WHITE/GREY............................BLACK.................................... >100K OHM
........................................(ring terminal)
TAN/BLACK..............................BLACK.....................................>200K OHM
........................................(ring terminal)
YELLOW/RED............................BLACK.....................................> 10K OHM
(female terminal)..................(ring terminal)
YELLOW/RED............................BLACK.....................................> 50K OHM
(male terminal).....................(ring terminal)
BLACK.....................................RED........................................> 10K OHM
(ring terminal).......................(ring terminal)
Sorry for the long post but trouble shooting an electrical problem is time consuming. In reading the manual, it does seem that you may have 2 problems. First, the lanyard cap and post may not be making the contact required to communicate with the mpem. Second, the solenoid may be the source of your blowing 5 amp fuse.
This post should give you enough information to reply to us so that we know where to go next. Let us know how you come out. We’re here to help!
