3
SECTION 3 - TROUBLESHOOTING AND SPECIAL TOOLS
TROUBLESHOOTING ------------------------------------------------------------------------------------------------------------------------------------- 26
Preliminary Instructions ------------------------------------------------------------------------------------------------------------------------------ 26
Check Ignition System ------------------------------------------------------------------------------------------------------------------------------- 26
Check Fuel System - Carbureted Engine -------------------------------------------------------------------------------------------------------27
Check Fuel System - Fuel-Injected Engine (EFI) ---------------------------------------------------------------------------------------------27
Check Fuel System Pressure - EFI and EFI-ETC -------------------------------------------------------------------------------------- 28
Check Compression Components ---------------------------------------------------------------------------------------------------------------- 29
Compression Test --------------------------------------------------------------------------------------------------------------------------------29
Cylinder Leakdown Test ------------------------------------------------------------------------------------------------------------------------29
Cylinder Balance Test -------------------------------------------------------------------------------------------------------------------------- 30
Check Crankcase Breather ------------------------------------------------------------------------------------------------------------------------- 31
Troubleshooting Guide - Gasoline Fueled Engines ------------------------------------------------------------------------------------------ 32
Troubleshooting Guide - Gaseous-Fueled Engines ------------------------------------------------------------------------------------------ 35
Additional Troubleshooting Help -------------------------------------------------------------------------------------------------------------------36
Electrical Systems ------------------------------------------------------------------------------------------------------------------------------------- 37
Alternator ------------------------------------------------------------------------------------------------------------------------------------------- 37
System Diagnosis - Alternator ---------------------------------------------------------------------------------------------------------- 37
Charging System Identification ----------------------------------------------------------------------------------------------------------37
Testing Alternator Output ---------------------------------------------------------------------------------------------------------------------- 38
20 Amp Regulated Alternator ----------------------------------------------------------------------------------------------------------- 38
Output Test - 20 Amp Alternator --------------------------------------------------------------------------------------------------38
Regulator-Rectifier Test- 20 Amp ------------------------------------------------------------------------------------------------ 38
20/50 Amp Regulated Alternator ------------------------------------------------------------------------------------------------------- 38
Output Test - 20/50 Amp Alternator ----------------------------------------------------------------------------------------------38
Regulator-Rectifier Test - 20/50 Amp --------------------------------------------------------------------------------------------38
Anti-Afterfire Solenoid - Carbureted Engines --------------------------------------------------------------------------------------------- 39
Testing the Battery -------------------------------------------------------------------------------------------------------------------------------39
BatteryVoltageTest ------------------------------------------------------------------------------------------------------------------------39
Battery Load Test ---------------------------------------------------------------------------------------------------------------------------39
Test Engine Wiring Harness ------------------------------------------------------------------------------------------------------------------ 40
Test Engine Wiring ------------------------------------------------------------------------------------------------------------------------- 40
Test Engine Wire Harness Continuity -------------------------------------------------------------------------------------------------40
Engine Wiring Harness Diagram ------------------------------------------------------------------------------------------------------- 41
Carbureted and Gaseous Engine Wire Harness Connector Pin-Out ---------------------------------------------------- 41
Oil Pressure ----------------------------------------------------------------------------------------------------------------------------------------42
Test Oil Pressure Switch ----------------------------------------------------------------------------------------------------------------- 42
24 vanguardpower.com
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