Kohler LH630-775 Service Manual page 41

Electronic Fuel Injection (EFI)
Contents
Description
Initial Starting/Priming Procedure .................................................................................................................... 5B.2
Fuel Recommendations ........................................................................................................................................ 5B.2
EFI Fuel System Components .............................................................................................................................. 5B.3
Operation ................................................................................................................................................................ 5B.3
Important Service Notes ...................................................................................................................................... 5B.4
Electrical Components
Electronic Control Unit (ECU) .................................................................................................................... 5B.4-5B.5
Engine Speed Sensor ..................................................................................................................................... 5B.5-5B.6
Throttle Position Sensor (TPS) & "Auto-Learn" Initialization Procedures ......................................... 5B.6-5B.8
Engine (Coolant) Temperature Sensor ....................................................................................................... 5B.8-5B.9
Oxygen Sensor ............................................................................................................................................ 5B.9-5B.11
Electrical Relay ......................................................................................................................................... 5B.11-5B.12
Fuel Injectors ............................................................................................................................................. 5B.12-5B.15
Ignition System ......................................................................................................................................... 5B.15-5B.16
Spark Plugs ........................................................................................................................................................... 5B.16
Wiring Harness ................................................................................................................................................... 5B.16
Battery Charging System ................................................................................................................................... 5B.16
Fuel Components
Fuel Pump .................................................................................................................................................. 5B.16-5B.17
Fuel Pressure Regulator .......................................................................................................................... 5B.17-5B.18
Fuel Filter .............................................................................................................................................................. 5B.19
Fuel Rail ................................................................................................................................................................ 5B.19
Fuel Line ................................................................................................................................................................ 5B.19
Throttle Body/Intake Manifold Assembly ....................................................................................................... 5B.20
Idle Speed Adjustment (RPM) ........................................................................................................................... 5B.20
Initial Governor Adjustment ................................................................................................................. 5B.20-5B.22
Troubleshooting
Electrical System ...................................................................................................................................... 5B.22-5B.25
Fuel System .......................................................................................................................................................... 5B.26
Fault Codes ................................................................................................................................................ 5B.26-5B.33
Troubleshooting Flow Chart .................................................................................................................. 5B.33-5B.34
Flow Chart Diagnostic Aids ................................................................................................................... 5B.35-5B.36
Common Complaints/Problems ............................................................................................................ 5B.36-5B.37
Section 5B
Fuel System
Section 5B
EFI Fuel System
Page(s)
5B.1
5B