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5B.1
Section 5B
EFI Fuel System
5B
Section 5B
Electronic Fuel Injection (EFI)
Fuel System
Contents Page(s)
Description
Initial Starting/Priming Procedure.........................................................................................................................5B.2
Fuel Recommendations...................................................................................................................................5B.2-5B.3
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 Procedures...................................................................5B.6-5B.9
Engine (Oil) Temperature Sensor ................................................................................................................5B.9-5B.10
Oxygen Sensor..............................................................................................................................................5B.10-5B.12
Electrical Relay .............................................................................................................................................5B.12-5B.13
Fuel Injectors ................................................................................................................................................5B.13-5B.16
Ignition System .......................................................................................................................................................5B.17
Spark Plugs ..............................................................................................................................................................5B.18
Wiring Harness .......................................................................................................................................................5B.18
Battery Charging System .......................................................................................................................................5B.18
Fuel Components
Fuel Pump.....................................................................................................................................................5B.18-5B.19
Fuel Pressure Regulator ..............................................................................................................................5B.19-5B.21
Fuel Filter .................................................................................................................................................................5B.21
Fuel Rail ...................................................................................................................................................................5B.21
Fuel Line........................................................................................................................................................5B.21-5B.22
Throttle Body/Intake Manifold Assembly ..........................................................................................................5B.22
Idle Speed Adjustment (RPM) ...................................................................................................................5B.22-5B.23
Initial Governor Adjustment ......................................................................................................................5B.23-5B.25
Troubleshooting
Troubleshooting Guide ..........................................................................................................................................5B.25
Electrical System ..........................................................................................................................................5B.25-5B.29
Fuel System..............................................................................................................................................................5B.30
Fault Codes ...................................................................................................................................................5B.30-5B.38
Troubleshooting Flow Chart ......................................................................................................................5B.38-5B.39
Flow Chart Diagnostic Aids .......................................................................................................................5B.40-5B.41
EFI Service Tools ............................................................................................................................... Refer to Section 2