
4.21
ELECTRONIC CONTROL UNIT
OPERATION OVERVIEW
The ECU is a solid state component that serves as the
controller for the fuel injection system.
The ECU receives input from the EFI sensors including,
but not limited to:
• Engine Coolant Temperature
• Intake Temperature/Manifold Absolute Pressure (T-
MAP)
• Oxygen Sensor
• Throttle Position Sensor
The inputs cause the ECU to respond based on it’s
software calibration. The ECU responds by opening and
closing the output circuits of the EFI system. These
include but are not necessarily limited to:
• Fuel Injectors
• Electronic Throttle Control (ETC)
• Oxygen Sensor Heater
• Ignition Coil
• Idle Air Controller (IAC)
During
operation,
the
ECU
continually
performs
diagnostic checks of itself, each of the sensors, and
system performance. If a fault is detected, the ECU turns
on the “Check Engine” light in the speedometer and
stores the fault code in its fault memory. Depending on
the significance or severity of the fault, normal operation
may continue, or "Fail-Safe" operation (slowed speed,
richer running) may be initiated. A technician can
determine the cause of the “Check Engine” light by
referencing
the
“Instrument
Cluster
Trouble
Code
Display” and “Diagnostic Trouble Code Table” or by using
Digital Wrench®. The ECU requires a minimum of 7.0
volts to operate. The memory in the ECU is operational
the moment the battery cables are connected.
To prevent engine over-speed and possible failure, an
RPM-limiting feature is programmed into the ECU. If the
maximum RPM limit (7600) is exceeded, the ECU
suppresses the injection signals, cutting off the fuel flow.
This process repeats it self in rapid succession, limiting
operation to the preset maximum.
Maximum RPM Limit: 7600
Содержание Sportsman 850 Touring EPS
Страница 4: ......
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Страница 72: ...2 40 NOTES MAINTENANCE ...
Страница 78: ...3 6 OIL FLOW DIAGRAM ENGINE COOLING SYSTEM ...
Страница 93: ...3 3 21 WATER PUMP ASSEMBLY TORQUE SPECIFICATIONS ENGINE COOLING SYSTEM ...
Страница 94: ...3 22 STATOR COVER ASSEMBLY TORQUE SPECIFICATIONS ENGINE COOLING SYSTEM ...
Страница 100: ...3 28 VALVE COVER ENGINE COOLING SYSTEM ...
Страница 101: ...3 3 29 CAMSHAFT CARRIER CAMSHAFT ROCKER ARM ENGINE COOLING SYSTEM ...
Страница 102: ...3 30 CYLINDER HEAD VALVES INTEGRATED THROTTLE BODY ENGINE COOLING SYSTEM ...
Страница 103: ...3 3 31 VALVE AND SPRING HEIGHT DETAIL SPM850 ENGINE COOLING SYSTEM ...
Страница 104: ...3 32 VALVE AND SPRING HEIGHT DETAIL SPM1000 ENGINE COOLING SYSTEM ...
Страница 105: ...3 3 33 PISTON CONNECTING ROD ENGINE COOLING SYSTEM ...
Страница 106: ...3 34 CRANKSHAFT ENGINE COOLING SYSTEM ...
Страница 107: ...3 3 35 CRANKCASE ENGINE COOLING SYSTEM ...
Страница 108: ...3 36 CRANKCASE UPPER ENGINE COOLING SYSTEM ...
Страница 109: ...3 3 37 BALANCE SHAFT BALANCE SHAFT TIMING ENGINE COOLING SYSTEM ...
Страница 110: ...3 38 CRANKCASE LOWER WITH OIL PUMP ENGINE COOLING SYSTEM ...
Страница 111: ...3 3 39 STATOR COVER FLYWHEEL WATER PUMP COUPLER ENGINE COOLING SYSTEM ...
Страница 112: ...3 40 WATER PUMP WATER PUMP COUPLER STATOR ENGINE COOLING SYSTEM ...
Страница 113: ...3 3 41 DRIVE COUPLER REAR STARTER GEAR ENGINE COOLING SYSTEM ...
Страница 141: ...3 3 69 CRANKCASE ASSEMBLY UPPER ENGINE COOLING SYSTEM ...
Страница 143: ...3 3 71 BALANCE SHAFT TIMING ENGINE COOLING SYSTEM ...
Страница 145: ...3 3 73 CRANKCASE SEALANT AND TORQUE VALUES ENGINE COOLING SYSTEM ...
Страница 154: ...3 82 NOTES ENGINE COOLING SYSTEM ...
Страница 160: ...4 6 FUEL TANK FUEL TANK ASSEMBLY VIEW FUEL SYSTEM ...
Страница 170: ...4 16 EFI SYSTEM LAYOUT EFI SYSTEM ASSEMBLY VIEW FUEL SYSTEM ...
Страница 204: ...4 50 NOTES FUEL SYSTEM ...
Страница 217: ...5 5 13 DRIVE CLUTCH SERVICE DRIVE CLUTCH EXPLODED VIEW ALL MODELS PVT SYSTEM ...
Страница 245: ...6 6 11 Primary Shaft Rear Output Shaft Reverse Shaft Coupler Input Shaft TRANSMISSION ...
Страница 246: ...6 12 Cam Shift Shaft Bellcrank Shift Shaft TRANSMISSION ...
Страница 254: ...6 20 TRANSMISSION EXPLODED VIEW TRANSMISSION ...
Страница 330: ...7 74 NOTES FINAL DRIVE ...
Страница 338: ...8 8 STEERING EPS STEERING ASSEMBLY VIEW EPS MODELS STEERING SUSPENSION ...
Страница 372: ...8 42 NOTES STEERING SUSPENSION ...
Страница 374: ...9 2 BRAKE SYSTEM TROUBLESHOOTING 9 25 BRAKE SYSTEM TROUBLESHOOTING 9 25 BRAKE NOISE TROUBLESHOOTING 9 26 BRAKE SYSTEM ...
Страница 377: ...9 9 5 BRAKE SYSTEM ASSEMBLY VIEWS SPORTSMAN SCRAMBLER 850 BRAKE SYSTEM BRAKE SYSTEM ...
Страница 378: ...9 6 SPORTSMAN SCRAMBLER 1000 BRAKE SYSTEM BRAKE SYSTEM ...
Страница 379: ...9 9 7 SPORTSMAN SCRAMBLER INTERNATIONAL BRAKE SYSTEM BRAKE CALIPER EXPLODED VIEW BRAKE SYSTEM ...
Страница 381: ...9 9 9 BRAKE SYSTEM ...
Страница 436: ...11 22 INSTERMENT CLUSTER TROUBLESHOOTING INSTRUMENT CLUSTER KEY OFF NO POWER ELECTRICAL ...
Страница 437: ...11 11 23 INSTRUMENT CLUSTER KEY ON NO POWER ELECTRICAL ...
Страница 438: ...11 24 INSTRUMENT CLUSTER NO HIGH BEAM INDICATOR ELECTRICAL ...
Страница 439: ...11 11 25 INSTRUMENT CLUSTER NO INCORRECT FUEL LEVEL ELECTRICAL ...
Страница 492: ...11 78 EPS TROUBLESHOOTING ELECTRICAL ...
Страница 497: ...11 11 83 BREAKOUT WIRING DIAGRAMS AWD NON ETC AWD INPUT ETC COOLING FAN CRANKSHAFT POSITION SENSOR ELECTRICAL ...
Страница 499: ...11 11 85 INTAKE AIR TEMP SENSOR NON ETC THROTTLE POSITION SENSOR NON ETC TMAP ETC TMAP NON ETC ELECTRICAL ...
Страница 500: ...11 86 NOTES ELECTRICAL ...