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CHAPTER 4 MI-04 LP BASIC TROUBLESHOOTING
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
Engine Cranking
but Will Not Start
Tier
G420E/G424E
Probable Cause
Fuel container empty
Liquid valve closed
Excess flow valve closed
Plugged fuel line
Broken Fuse - SECM
Clogged fuel filter
Faulty vapor connection between
the pressure regulator/converter
and the mixer
Fuel Lock-off malfunction
Pressure regulator/converter
malfunction
Incorrect air/fuel or ignition/spark
control
LP Engine
Corrective Action
Fill fuel container
Do not exceed 80% of liquid capacity
Slowly open liquid valve
Reset excess flow valve
Close liquid valve
Wait for a "click" sound
Slowly open liquid valve
Remove obstruction from the fuel line
Close liquid fuel valve
Using caution, disconnect the fuel line
(some propane may escape)
Clear obstruction with compressed air
Re-connect fuel line
Slowly open liquid fuel valve
Leak test
Replace Fuse for SECM
See Maintenance Section of Operation &
Maintenance Manual, Fuses replacement
Repair/replace as required
See Chapter 3 Fuel Filter replacement
Check connection
Verify no holes in hose
Clamps must be tight
Look for kinked, pinched and/or
collapsed hose
Repair/replace Fuel Lock-off
See Chapter 3 Fuel Lock-off
Test pressure regulator/converter operation
See Chapter 9 Tests and Adjustments
See Chapter 5 Advanced Diagnostics
37
Basic Troubleshooting
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