Engine Fuel System Voltage Test Procedure (Ecu Test) - Lincoln Electric Classic 300 MP Service Manual

LINCOLN ELECTRIC

ENGINE FUEL SYSTEM VOLTAGE TEST PROCEDURE (ECU TEST)

Service and repair should be performed by only Lincoln Electric factory trained personnel. Unauthorized
repairs performed on this equipment may result in danger to the technician or machine operator and will
invalidate your factory warranty. For your safety and to avoid electrical shock, please observe all safety
notes and precautions detailed throughout this manual. If for any reason you do not understand the test
procedures or are unable to perform the test/repairs safely, contact the Lincoln Electric Service Department
for electrical troubleshooting assistance before you proceed. Call 1-888-935-3877.
TEST DESCRIPTION
This test will determine if the Fuel System is getting the electrical power needed to function correctly.
MATERIALS NEEDED
Wiring Diagram
TEST PROCEDURE
1. Place the 'Run/Stop' switch into the Run position.
2. Locate the engine fault indicator, on the Fuel/Hour/LED gauge. See Figure F.5. See Wiring Diagram.
3. Observe the code indicated by the engine fault indicator and take the appropriate actions according
to Table F.1. See Figure F.6. See Wiring Diagram.
LIGHT CODE
RPM IS OVER 115% OF RATED RPM
LONG 1, SHORT 1
(2070 RPM).
LOW OIL PRESSURE DETECTED FOR 1
LONG 1, SHORT 2
SECOND.
"L" TERMINAL IS GROUNDED ON
LONG 1, SHORT 3
ALTERNATOR FOR 1 SECOND.
HIGH WATER TEMPERATURE
LONG 1, SHORT 4
DETECTED FOR 1 SECOND.
Table F. 1 – Engine fault indicator codes
FAILURE DETECTED
Classic® 300 MP Service Manual
POSSIBLE CAUSE – CORRECTIVE MEASURE
ACTUATOR IS STUCK – REMOVE ACTUATOR
AND VERIFY PLUNGER PULLS IN WHEN
ENERGIZED.
LOW OIL – CHECK OIL LEVEL ON DIPSTICK.
FAULTY OIL PRESSURE SWITCH – CHECK THAT
"WK" STUD IS OPEN WHEN ENGINE IS
RUNNING.
LEAD TO OIL PRESSURE SWITCH "WK" STUD
MAY BE GROUNDED – CHECK.
BROKEN OR LOOSE BELT.
LEAD TO "L" TERMINAL ON ALTERNATOR MAY
BE SHORTED TO GROUND – CHECK.
FAULTY ALTERNATOR – CHECK.
AMMOUNT OR QUALITY OF COOLANT
INCORRECT – CHECK.
FAULTY WATER TEMPERATURE SWITCH –
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