Polaris 850 SKS 155 2020 User Manual

4
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
© Copyright Polaris Inc.
4.1
ENGINE ELECTRICAL
CHAPTER 4
ENGINE ELECTRICAL
GENERAL INFORMATION. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . . .. . ... . ... . . .. . . .. . . .. . 4.2
DIAGNOSTIC POWER CONNECTOR . . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. 4.2
ENGINE PROTECTION FEATURES . ... . . .. . . .. . . .. . ... . ... . ... . ... . . .. . . .. . ... . ... . .. . . ... . ... . ... . ... 4.3
ENGINE TEMPERATURE PROTECTION MODES . .. . . .. . . .. . ... . ... . ... . .. .. . . .. . ... . ... . .. . . ... . ... . 4.3
ENGINE OVERHEATING TROUBLESHOOTING . . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . . 4.3
DETONATION (DET) PROTECTION MODES . . .. . . .. . . .. . . ... . ... . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . 4.4
DETONATION (DET) TROUBLESHOOTING . ... . ... . .. . . ... . ... . ... . ... . ... . ... . .. . . ... . ... . ... . ... . .. 4.5
EXTENDED IDLE ENGINE SHUTDOWN MODE . . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . . . 4.5
CLEANFIRE FUEL INJECTION (CFI) SYSTEM . . ... . .. . . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . .. 4.6
CLEANFIRE FUEL INJECTION OVERVIEW .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . 4.6
EXHAUST GAS TEMPERATURE (EGT) SENSOR . . ... . . .. . . .. . . .. . . .. . . .. . ... . ... . . .. . . .. . . .. . . .. . ... 4.7
AIR TEMPERATURE / PRESSURE SENSOR (T-MAP) . .. . . .. . ... . ... . ... . ... . ... . . .. . ... . ... . ... . .. . . . 4.8
CRANKSHAFT POSITION SENSORS (CPS). ... . ... . .. . . .. . . .. . . .. . . .. . . ... . ... . .. . . .. . . .. . . .. . . .. . . .. 4.8
CRANKSHAFT POSITION SENSOR AIR GAPS. . . .. . . .. . . .. . . .. . . .. . ... . ... . . .. . . .. . . .. . . .. . ... . ... . .. 4.9
IGNITION COIL PACKS.. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . ... . . .. . . .. . . .. .4.10
ENGINE COOLANT TEMPERATURE (ECT) SENSOR . . .. .. . . .. . . .. . ... . ... . ... . ... . . .. . . .. . ... . ... . .4.10
KNOCK (DET) SENSOR .. . . .. . .. .. . . .. . . .. . . .. . . .. . ... . ... . . .. . . .. . . .. . . .. . ... . ... . ... . . .. . . .. . . .. . .. 4.11
FUEL PRESSURE SENSOR. .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . .4.11
ELECTRONIC CONTROL UNIT (ECU) . . ... . . .. . . .. . ... . ... . ... . ... . ... . . .. . ... . ... . .. . . ... . ... . ... . ..4.12
ECU (CNA) 34 PIN CONNECTOR PINOUT . ... . . .. . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ... . ... . ..4.12
ECU (CNB) 34 PIN CONNECTOR PINOUT . ... . . .. . ... . ... . .. . . ... . ... . ... . ... . ... . .. . . .. . . ... . ... . ..4.13
ECU LABEL INFORMATION . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . ... . ... . ... . . .. . . .. . . .. . ... . ... . .4.14
ECU LOCATION / MOUNTING . . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ..4.14
THROTTLE POSITION SENSOR (TPS) . . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. .4.16
THROTTLE POSITION SENSOR (TPS) OVERVIEW . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . .. .. . . .. .4.16
THROTTLE POSITION SENSOR (TPS) TESTING .. . . .. . . .. . . .. . . .. . .. .. . . .. . . .. . . .. . ... . ... . ... . . .. .4.16
TPS WIRE ROUTING. .. . . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . .. . . ... . .. . . .. . . .. . . .. . . .. . . .. . . .. . .4.17
POLARIS ELECTRONIC REVERSE CONTROL (PERC) . . ... . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. .4.18
PERC OVERVIEW. . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . . .. . ... . . .. . . .. . . .. . . .. . . .. . . .. . ... . . .. . . .. . . .. . . ..4.18
PERC OPERATION. . ... . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . .4.18
PERC FORWARD OPERATION . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . . .. . . .. . . .. . . ... . ... . .. . .4.18
PERC TROUBLESHOOTING NOTES. ... . ... . ... . .. . . .. . . ... . ... . ... . ... . .. . . .. . . .. . . ... . ... . ... . .. . .4.18

Polaris 850 SKS 155 2020 Specifications

General

Brand	Polaris
Model	850 SKS 155 2020
Category	Snowmobiles
Language	English