Service manual

CANDoo Professional
189
In the table above, please note that the first row of the table is not an actual fault, rather it is a total
snapshot of all faults combined.
Fault States
The DI Fault system has three fault states:
 Inactive
 Active
 Occurred
Inactive Faults
"Inactive" means that a fault is not currently active, and has not been active since the ski has been
powered up
Active Faults
"Active" means that the fault is currently happening now; the underlying problem causing the fault
still exists and must be fixed.
Occurred Faults
"Occurred" means that a fault became active since the ski was powered up, but at this moment, it is
not active.
Fault State Examples
An example will help illustrate the fault states and how the fault states can confuse technicians that
don't undstand them fully. First, let me describe how the DI engine management system works in
the context of faults. The DI Engine Management System (EMS) uses input from a large number of
sensors to calculate the proper amount of fuel to inject as well as the ignition timing. If the EMS
loses a signal from a critical sensor, like the TPS for example, or gets input from the sensor that
doesn't make sense, it cannot compute the proper fuel to inject so it throws a fault, lights the Maint
light, and puts the ski into Limp Mode (reduced engine RPM capability).
Example 1:
You (or your customer) is riding the DI, and hits a wake. The connection to the Manifold Air
Pressure Sensor (MAPS) loses contact temporarily from the abrubt jarring when the ski hit the
wake. The EMS system senses this, throws a fault, ski goes into Limp Mode. Immediately after
the ski hits the bump, the connection to the MAPS is now good again, and the user rides the ski
back to the dock. At this time, the fault is not Active, but the ski is still in Limp mode. For this
particular fault, the ski must be shut off and restarted to resume normal operation. (most faults that
result in limp mode resume normal operation once fault cause goes away and the ski is returned to
idle, but a few (like MAPS or TPS) require the ski to be shut off and restarted)
Upon returning to shore, if you were to read the faults using Candoo before shutting off the ski , you
would notice that the fault shows to be Occurred. However, it is very rare that you would return to
shore, connect CANDooPro, and read the ski. Most of the time, ski is shut off, and the next time
you power it up and read the ski, the MAPS fault would show as inactive. Most DI faults are