Kubota WG1605-E3 Diagnostic Manual page 109

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
LPG / Natural Gas Fuel System Diagnosis
Step
Were you referred to this procedure by a DTC
L1
diagnostic chart?
Connect the EControls GCP display SW (EDIS).
Key On Engine Off System Mode Stopped
L2
Are any DTCs present in the ECM?
Verify that the LPG / Natural Gas fuel tank has a
minimum 1/4 tank of fuel, and that the manual valve
L3 is open.
Is the tank valve open and fuel in the tank?
Connect a 0 to 69 kPa (0 to 0.70 kgf/cm
gauge to the primary test port of the dual stage
regulator (DSR).
Key On Engine Running System Running Mode
L4
Observe the pressure reading, for the DSR primary
pressure.
Is the fuel pressure ABOVE the specified value?
Turn OFF the ignition.
Disconnect the LPG / Natural Gas Fuel lock Off
electrical connector.
Install a test light between the 12 V supply pin of the
LPG / natural gas Fuel lock-off connector and battery
L5
ground, or connect a DVOM between the two pins.
Crank the engine. The test light should illuminate or
12 V should be present.
Does the test light illuminate?
Using a DVOM, check the resistance of the LPG /
natural gas fuel lock-off.
L6
Is the resistance within the specified range?
Turn the ignition OFF.
Close the manual shut-off valve on the LPG / natural
gas tank.
CAUTION
• When disconnecting LPG / natural gas fuel
L7
lines, liquid LPG / natural gas may be present.
Perform this step in a well ventilated area.
Slowly loosen the fuel inlet hose fitting, at the inlet of
the LPL.
Was fuel present, when the fitting was loosened?
Engines fitted with a LPG / natural gas in-line fuel
filter:
L8A
Slowly loosen the inlet to the fuel filter.
Was fuel present, when the fitting was loosened?
Engines fitted with a integrated filter to the LPL.
Remove the filter from the LPL.
Empty the contents, of the inlet side of the LPG /
natural gas fuel filter, onto a clean surface.
Inspect the contents of the LPG / natural gas fuel
filter, for an excessive amount of foreign material or
L8B water.
If necessary, locate and repair the source of
contamination.
Verify if the LPG / natural gas fuel filter is not
restricted or plugged.
Was a problem found?
Action
2
, 0 to10 psi)
1-99
Value(s) Yes
Go to
–
Step L3
Go to the
– applicable
DTC Table
Go to
–
Step L4
14 to 24 kPa
(0.14 to Go to
2
0.24 kgf/cm , Step L13
2.0 to 3.5 psi)
Go to
12 V
Step L6
Go to
12 to 24 W
Step L7
Go to
–
Step L8B
Go to
–
Step L11
Go to
–
Step L11
ECM SYSTEM
No
Go to
Step L2
Go to
Step L3
Refuel tank
and Open
Valve
Go to
Step L5
Go to
Step L12
Go to
Step L14
Go to
Step L8A
Go to
Step L9
Go to
Step L9
KiSC issued 12, 2016 A