Section 06 ENGINE MANAGEMENT (SDI)
Subsection 01 (OVERVIEW)
DIAGNOSTIC MODE
The malfunctions are recorded in the memory
of the ECM. The memory of the ECM can be
checked using the VCK (Vehicle Communication
Kit) (P/N 529 035 981) to see the fault codes. Re-
fer to the DIAGNOSTIC PROCEDURES section.
ROTAX ELECTRONIC REVERSE
(RER)
There is 3 main components used for the RER
system : the start/RER switch, the ECM and the
crankshaft position sensor.
The ECM receives signals from the crankshaft po-
sition sensor (CPS) for the following functions:
– Forward engine rotation.
– Reverse engine rotation.
– Crankshaft position and engine RPM.
The ECM recognizes a signal sent by the
START/RER switch.
When switch is activated and engine is not run-
ning, ECM allows normal engine starting.
When switch is activated and engine is running,
ECM cuts off ignition. Therefore, engine RPM
gradually drops.
When engine reaches a low
threshold RPM, ECM sends an ignition spark at
a great advance creating a thrust which reverses
engine rotation.
Under a threshold low RPM or above drive pulley
engagement speed, the RER function is disabled.
Nothing takes place when pressing Start/RER but-
ton.
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