05-3
Section 05 DIGITAL PERFORMANCE MANAGEMENT (DPM) SYSTEM
Introduction
The engine is being started using the electrical or
the manual starter.
The DPM module increases pressure within all 3
carburetor bowls thus the air/fuel mixture is en-
riched. This is what we call the enrichment mode.
As soon as the spark plug gives off its first spark,
the DPM module calculates the enrichment time
and rate based on the engine temperature.
Approximately one minute after starting the en-
gine, the module goes from enrichment to stand-
by mode.
Carburetor bowls then receive the atmospheric
pressure, and the air/fuel mixture is identical to
that of carburetors without the digital perfor-
mance management (DPM) system.
If engine speed is increased to approximately
3000 RPM, the module goes from standby to
compensation mode. The air temperature must
exceed -20°C (-4°F) and the air pressure must be
lower than 1000 mbar.
Float bowls are now under vacuum and the air/
fuel mixture is leaner.
NOTE:
Both modes can never operate at the
same time. The system either makes the mixture
richer or leaner. Or, the mixture remains un-
changed when module is on standby.
DPM MODULE OPERATION
General
1. Engine temperature sensor, 3-09 housing
2. Enrichment solenoid, 3-11 housing
3. Compensation solenoid, 3-10 housing
4. Power supply (+ and -), signal for MPEM, air temperature sensor,
3-07 housing
5. Enrichment switch, 3-08 housing
6. Communication port (reserved to manufacturer), 2-05 housing
7. Atmospheric pressure nipple
Direct current is supplied to the module which is
protected with a 1 A fuse.
BLACK and WHITE/GRAY wires (2-05 housing)
are used for programming by the manufacturer.
Nothing must be plugged to this housing.
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