Ski-Doo Ski Doo MX Z 2005 [214/1429] Overview

Ski-Doo Ski Doo MX Z 2005 [214/1429] Overview
Section04FUELSYSTEM
Subsection 03 (DPM SYSTEM)
OVERVIEW
NOTE: For Power TEK engines, refer to ENGINE
MANAGEMENT.
The carburetors are calibrated to operate at -20°C
(-4°F), at sea level. Under these conditions the
carburetors will properly fulfill engine air/fuel re-
quirements and the DPM is not used. Therefore,
the carburetor bowls are under atmospheric pres-
sure and the carburetors work as conventional car-
buretors.
NOTE: For engine starting and warm-up, the re-
quired richer mixture is supplied by a conventional
choke (enricher type).
When the temperature and/or altitude increases,
then the carburetor jetting becomes inappropriate
because engine needs less fuel. The DPM will
then decrease the carburetor bowl pressure which
in turn, leans the fuel mixture.
The DPM receives negative pressure created in
the carburetor venturi. A solenoid (controlled by
MPEM) opens the passage, when activated, to
decrease the pressure in the carburetor bowls.
SYSTEM TESTING
All DPM Models except Power Tek Engines
NOTE: For Power TEK engines, refer to ENGINE
MANAGEMENT.
Air Temperature Sensor
At 20°C(68°F), the sensor resistance must be
2500
±300.
Sensor should also be tested through all its oper-
ating range. Use the following chart.
Replace sensor if not within specifications.
TEMPERATURE
°C °F
RESISTANCE
(OHMS)
-30 -22 28 000
-20 -4 14 500
0 32 5500
20 68 2500
40 104 1200
60 140 600
80 176 320
100 212 180
120 248 120
Solenoid and MPEM
Static Test
Unplug electric connector of solenoid and connect
it to a 12 V battery. The solenoid must sound
when it opens. Otherwise, replace solenoid. Re-
peat test several times.
Dynamic Test
Air temperature sensor must be at 20°C(68°F).
For the test, operate the engine at the RPM spec-
ified in the following chart.
MODEL TEST RPM
All 3800
The solenoid must vibrate.
Otherwise, ensure fuse(s), wiring harness and
connections are in good condition and if so, try
a new MPEM and retest. Refer to ELECTRICAL
section.
PARTS REMOVAL AND
INSTALLATION
All DPM Models
Solenoid
At reassembly, ensure that solenoid seals are in
place.
mmr2005-104 195

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