Service manual

CANDoo Professional
188
Sea Doo introduced the Direct Injection system in 2000. In general, the DI's are pretty reliable,
start easily, and have excellent fuel economy. The downside of these watercraft is that they are
hard to work on, especially if you do not have a diagnostic system like CANDooPro. The DI MPEM
has a decent fault monitoring system, so if a problem occurs and the watercraft trips a fault that
results in the Maintenance light coming on, that fault is logged internally to enable you to zero in on
the problem that caused the fault to occur. More severe faults also cause the watercraft to go into
"Limp" mode; a reduced RPM situation to prevent engine damage.
Please note that there are a number of problems that can occur with DI's that do not cause a fault
to occur. For example, the DI system does not monitor Fuel or Air pressure. If either one of these
are not proper, the ski will not run right, but a fault may not be tripped in the MPEM. Additionally,
the Regulator/Rectifier on DI's are a well-known problem area. If the regulator does not put out the
proper voltage, there may or may not be a fault generated for the condition. An additional failure
mode is the regulator putting out an excessive amount of what is called "AC ripple". This will not
throw a fault, but the watercraft will not run over a certain RPM without misfiring.
The Fault Page
The fault page shows details of all of the possible 32 DI faults, as well as displaying information
about the first fault that was triggered after the faults and conditions were cleared.
First of all, let me say that the DI Fault detection and logging system is actually pretty simple and
straightforward, once you understand the terminology and how it works. It has some severe
limitations that add to the problem, but once you understand the limitations, you can easily put a
plan in place to get around the limitations.