
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
ft
Position Sensor ........................................................................................................................................ 5.9
Thro
tt
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
tt
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
tt
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
Summary of Contents for Command PRO CH749
Page 1: ...SERVICE MANUAL ECH630 ECH749 HORIZONTAL CRANKSHAFT ...
Page 2: ......
Page 4: ......
Page 76: ...6 6 Section 6 Lubrication System ...
Page 94: ...7 18 Section 7 Electrical System and Components ...
Page 112: ...8 18 Section 8 Disassembly ...
Page 126: ...9 14 Section 9 Inspection and Reconditioning ...
Page 153: ......