Operation Section
-69-
Basic Troubleshooting
The MI-04 systems are equipped with built-in fault
diagnostics. Detected system faults can be displayed by
the Malfunction Indicator Lamp (MIL) and are covered in
the Advanced Diagnostics section. Items such as fuel
level, plugged fuel lines, clogged fuel filters and
malfunctioning pressure regulators may not set a fault
code by the Small Engine Control Module (SECM).
Below are basic checks that should be made before
referring to the Advanced Diagnostics section, if engine
or drivability problems are encountered.
Locating a problem in a propane engine is done exactly
the same way as with a gasoline engine. Consider all
parts of the ignition and mechanical systems as well as
the fuel system.
Problem Probable Cause Corrective Action
Fuel container empty Fill fuel container
z Do not exceed 80% of liquid capacity
Liquid valve closed Slowly open liquid valve
Excess flow valve closed Reset excess flow valve
z Close liquid valve
z Wait for a “click” sound
z Slowly open liquid valve
Plugged fuel line Remove obstruction from the fuel line
z Close liquid fuel valve
z Using caution, disconnect the fuel line
(some propane may escape)
z Clear obstruction with compressed air
z Re-connect fuel line
z Slowly open liquid fuel valve
z Leak test
Broken Fuse - SECM Replace Fuse for SECM
z See Maintenance Section, Fuses
replacement
Clogged fuel filter Repair/replace as required
z See Maintenance Section, LP Fuel
Filter replacement
Faulty vapor connection between
the pressure regulator/converter and
the mixer
Check connection
z Verify no holes in hose
z Clamps must be tight
z Look for kinked, pinched and/or
collapsed hose
Fuel Lock-off malfunction Repair/replace Fuel Lock-off
z See G643E Engine Service Manual
Pressure regulator/converter
malfunction
Test pressure regulator/converter operation
z See G643E Engine Service Manual
Engine Cranking
but Will Not Start
Incorrect air/fuel or ignition/spark
control
See Advanced Diagnostics
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