Kubota WG1605-E3 Diagnostic Manual page 105

WG1605-G-E3,WG1605-L-E3,WG1605-GL-E3, DM
Gasoline Fuel System Diagnosis
Step
Were you referred to this procedure by a DTC
G1
diagnostic chart?
Connect the EControls GCP Display SW tool Perform
the On Board Diagnostic (OBD) System Check.
Key On Engine Off.
System Stopped Mode.
G2
Check for DTC 87, 88, 91, 92, 627, 628, 629.
Are any fuel pump DTCs present in the ECM?
If codes are present follow those procedures first.
Verify that the Gasoline fuel tank has a minimum of
1/4 tank of fuel.
G3
Does the vehicle have fuel?
Check the fuel supply line from the tank to the fuel
pump for leakage, crimping, kinks or restriction.
G4
Was there a problem found?
Check the electrical connections at the fuel pump and
insure they are secured and tightened.
G5
Was there a problem found?
Check the Fuel Temperature and Pressure electrical
connectors at the Fuel Pressure Manifold.
G6
Was there a problem found?
Check the fuel delivery lines, to and from, the Fuel
Pressure Manifold for kinks, crimps or blockage of
G7 fuel flow.
Was there a problem found?
Key Off Engine Off.
Remove the fuel inlet hose to the injector rail.
Place the hose end into a container Key On Engine
G8 Off.
Did fuel flow from the hose during the prime
sequence?
Key Off Engine Off.
Using a volt meter place one probe on the VBAT
connector to the fuel pump and ground Key On.
G9
Engine Off.
Was the voltage > 80 % of VBAT?
Check the 10 Amp fuel pump fuse.
G10
Was there a problem found?
Check the fuel pump relay power supply.
Key off Engine Off.
Using a DVOM place the positive probe on Pin 5 at
the fuel pump relay and battery ground Key On.
G11
Engine Off.
Was the voltage > 80 % of VBAT?
Check the supply voltage to the relay.
Using a DVOM place the positive lead on Pin 3 at the
G12 relay and battery ground.
Was the voltage > 80 % of VBAT?
Action
1-95
Value(s) Yes
Go to
–
Step G3
Go to the
– applicable
DTC Table
Go to
–
Step G4
Go to
–
Step G2
Go to
–
Step G2
Go to
–
Step G2
Go to
–
Step G2
Go to
–
Step G2
Go to
> 80 % of VBAT
Step G16
Go to
–
Step G2
Go to
> 80 % of VBAT
Step G16
Go to
> 80 % of VBAT
Step G13
ECM SYSTEM
No
Go to
Step G2
Go to
Step G3
Put fuel into
the fuel tank
Go to
Step G5
Go to
Step G6
Go to
Step G7
Go to
Step G8
Go to
Step G9
Go to
Step G10
Go to
Step G11
Go to
Step G12
Repair Supply
voltage wiring
KiSC issued 12, 2016 A