Air Temperature / Pressure Sensor (T-Map); Crankshaft Position Sensors (Cps) - Polaris 850 PRO-RMK 155 2020 Manual

ENGINE ELECTRICAL
AIR TEMPERATURE / PRESSURE
SENSOR (T-MAP)
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The T-MAP sensor is mounted the top of the air box.
The T-MAP supplies the ECU with air intake temperature
and barometric pressure information.
Test the T-MAP using Digital Wrench to verify the return
signals match the current environment. A digital
multimeter can be used to test the resistance values for
both the temperature and pressure sensors. Compare
results to table below.
AIR TEMPERATURE / AIR PRESSURE SENSOR
(T-MAP)
Pins 1 to 2 (Temperature)
Pins 1 to 4 (Pressure)
Pins 3 to 4 (Pressure)
4.8
59 °F (15 °C) ≈ 3000Ω
68 °F (20 °C) ≈ 2500Ω
77 °F (25 °C) ≈ 2000Ω
2400 - 8200Ω
3400 - 8200Ω
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
CRANKSHAFT POSITION SENSORS
(CPS)
Two crankshaft position sensors are used to determine
engine direction, ignition / fuel injection angles and
engine speed.
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The 2 tooth CPS picks up 2 inner flywheel teeth and
determines crank angle.
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The 5 tooth CPS picks up 5 outer flywheel teeth and
determines the following:
• Judge direction of rotation (forward and backward)
• Ignition advance angle control
• Injector drive angle control
• Excess advance ignition control at reverse
• MAG / PTO cylinder detection
The sensors must be in the correct position or the engine
will not run. A sheared flywheel key will cause the engine
to not start or to shut off.
Test both position sensors using a digital multi-meter.
Compare resistance values to specification. The
crankshaft position sensors are not serviceable. If testing
reveals replacement is required, the stator assembly
must be replaced.
CRANKSHAFT POSITION SENSOR
RESISTANCE VALUES
SENSOR WIRE COLORS
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WHT – WHT/RED
Two-Tooth
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GRN – WHT/GRN
Five-Tooth
RESISTANCE
VALUES
@ 68 °F (20 °
C)
190 Ω +/- 15%
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