TROUBLESHOOTING AND ELECTRICAL SYSTEM:
DIESEL VEHICLES
TROUBLESHOOTING GUIDE
SYMPTOM
Engine does not start (starter motor does not
function).
Engine does not run smoothly.
Loss of engine power.
TABLE CONTINUED ON NEXT PAGE
POSSIBLE CAUSES
Battery is discharged
Key switch failed
Failed starter and/or starter solenoid
Start relay failure
Loose or improper wiring
One or both 30-amp fuses blown
Neutral switch failure (failed open)
Transmission shifter linkage is binding or is
out of adjustment
Diode 1, 2, 5, or 6 failed closed
Incorrect nozzle opening pressure
Injection nozzle clogged
Failed injection pump
Fuel overflow pipe clogged
Fuel leak caused by loose injection pipe
retaining nut
Fuel pump failure
Air filter is dirty or clogged
Fuel filter clogged or dirty
Water or dirt in the fuel system
Muffler or exhaust pipe restricted with carbon
or other substance
Air filter is dirty or clogged
Throttle linkage out of adjustment
Restricted fuel flow
Clutches are not backshifting properly
Low cylinder compression
Incorrect injection timing
Seized engine parts
Uneven fuel injection
Poor injection nozzle performance
2008-2012 All-Wheel Drive Maintenance and Service Manual
Troubleshooting Guide
REFER TO
Test Procedure 1 – Battery on page 12-12
Test Procedure 4 – Key Switch (Starter Circuit)
on page 12-17
Test Procedure 7 – Starter Control Circuit on
page 12-19
Test Procedure 8 – Start Relay on page 12-20
Check for proper wiring and tighten any loose
connections. See Wiring Diagram on page
12-8.
Test Procedure 2 – Fuse on page 12-15
Test Procedure 17 – Neutral Switch
(Transmission) on page 12-30
Forward/Reverse Shifter Cable Adjustment on
page 17-18
Test Procedure 12 – Wire Harness Diodes on
page 12-26
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Air Filter Replacement on page 16-22
Fuel System on page 16-8
Exhaust System on page 16-5
Air Filter Replacement on page 16-22
Engine Control Linkages on page 16-18
Fuel System on page 16-8
Clutches on page 16-26
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
12
Page 12-3
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