5B.1
Section 5B
EFI Fuel System
5B
CH26, CH745
Section 5B
Electronic Fuel Injection (EFI)
Fuel System
Contents Page(s)
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) and Initialization Procedure ........................................................ 5B.7-5B.10
Engine (Oil) Temperature Sensor .............................................................................................. 5B.10-5B.11
Oxygen Sensor ......................................................................................................................... 5B.11-5B.13
Electrical Relay ......................................................................................................................... 5B.13-5B.14
Fuel Injectors ............................................................................................................................ 5B.14-5B.17
Ignition System.......................................................................................................................... 5B.17-5B.18
Spark Plug........................................................................................................................................... 5B.18
Wiring Harness ......................................................................................................................... 5B.18-5B.19
Battery Charging System .................................................................................................................... 5B.19
Fuel Components
Fuel Pump................................................................................................................................. 5B.19-5B.20
Fuel Pressure Regulator ........................................................................................................... 5B.20-5B.22
Fuel Filter ............................................................................................................................................ 5B.22
Fuel Rail .............................................................................................................................................. 5B.22
Fuel Line ................................................................................................................................... 5B.22-5B.23
Throttle Body/Intake Manifold Assembly.............................................................................................. 5B.23
Idle Speed Adjustment (RPM) ................................................................................................... 5B.23-5B.24
Initial Governor Adjustment ....................................................................................................... 5B.24-5B.26
Troubleshooting
Troubleshooting Guide ........................................................................................................................ 5B.26
Electrical System....................................................................................................................... 5B.27-5B.33
Fuel System ........................................................................................................................................ 5B.34
Fault Codes............................................................................................................................... 5B.34-5B.42
Troubleshooting Flow Chart ...................................................................................................... 5B.42-5B.43
Flow Chart Diagnostic Aids ....................................................................................................... 5B.44-5B.45
EFI Service Tools ............................................................................................................. Refer to Section 2
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