Doosan D35C-5 FDA04 Operation & Maintenance Manual page 102

Operation Section
Basic Troubleshooting(LP)
The MI-07 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
Problem
Engine Cranking
but Will Not Start
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
No VR Sensor Signal
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.
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, Fuses

replacement
Repair/replace as required
See Maintenance Section, LP 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 Engine Service Manual

Test pressure regulator/converter operation
See Engine Service Manual

See Advanced Diagnostics
Verify the VR signal is present
See Advanced Diagnostics

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Corrective Action