Kohler Command PRO ECH749 Service Manual

5.1
Section 5
EFI Fuel System
5
Section 5
Electronic Fuel Injection (EFI)
System
Contents Page(s)
Description
Fuel Pump Module Connector Removal ................................................................................................................. 5.2
Initial Starting/Priming Procedure ........................................................................................................................... 5.2
Fuel Recommendations .............................................................................................................................................. 5.2
EFI Fuel System Components ................................................................................................................................... 5.3
Operation...................................................................................................................................................................... 5.3
Important Service Notes ...................................................................................................................................... 5.3-5.4
Electrical Components
Electronic Control Unit (ECU) ............................................................................................................................ 5.4-5.5
Wiring Harness ............................................................................................................................................................ 5.5
Electrical System ................................................................................................................................................... 5.5-5.8
Cranksha Position Sensor ........................................................................................................................................ 5.9
Thro le Position Sensor (TPS) and ECU Reset and TPS Learn Procedures ............................................... 5.9-5.11
Engine (Oil) Temperature Sensor ................................................................................................................... 5.11-5.12
Intake Air Temperature Sensor ............................................................................................................................... 5.12
Oxygen Sensor ................................................................................................................................................... 5.13-5.15
Manifold Absolute Pressure (MAP) Sensor .......................................................................................................... 5.16
Fuel Injectors ...................................................................................................................................................... 5.16-5.19
Ignition System .................................................................................................................................................. 5.19-5.20
Spark Plugs ................................................................................................................................................................ 5.20
Ba ery Charging System ......................................................................................................................................... 5.20
Fuel Components
Fuel Pump .......................................................................................................................................................... 5.20-5.22
Fuel Filter ................................................................................................................................................................... 5.22
High Pressure Fuel Line ................................................................................................................................... 5.22-5.23
Purge Port and Vent Hose Assembly ..................................................................................................................... 5.23
Thro le Body/Intake Manifold Assembly ............................................................................................................. 5.23
Idle Speed Adjustment (RPM)......................................................................................................................... 5.23-5.24
Initial Governor Adjustment ...........................................................................................................................5.24-5.25
Troubleshooting
Troubleshooting Guide............................................................................................................................................. 5.26
Fuel System ........................................................................................................................................................ 5.26-5.27
Fault Codes ....................................................................................................................................................... 5.27-5.35
Troubleshooting Flow Chart............................................................................................................................ 5.35-5.36
Flow Chart Diagnostic Aids ............................................................................................................................ 5.37-5.38
EFI Service Tools ................................................................................................................................Refer to Section 2

Kohler Command PRO ECH749 Specifications

General

Fuel System	Carburetor
Starter	Electric
Governor Type	Mechanical
Lubrication System	Full Pressure
Fuel Type	Gasoline
Crankshaft Orientation	Horizontal
Bore	3.27 in (83 mm)
Cooling System	Air
Oil Type	SAE 10W-30
Spark Plug Gap	0.030 in (0.76 mm)
Valve Clearance - Intake	0.004 - 0.006 in (0.10 - 0.15 mm)
Crankshaft Type	Varies by model
Crankshaft Thread Size	Varies by model
Crankshaft Length	Varies by model
Crankshaft Diameter	Varies by model
Type	Overhead Valve (OHV)