TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
Troubleshooting Guide
12
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
REFER TO
Battery is discharged
Test Procedure 1 – Battery on page 12-10
Key switch failed
Test Procedure 4 – Key Switch (Starter Circuit)
Failed starter and/or starter solenoid
Test Procedure 7 – Starter Control Circuit on
Start relay failure
Test Procedure 8 – Start Relay on page 12-19
Loose or improper wiring
Check for proper wiring and tighten any loose
connections.
One or both 30-amp fuses blown
Test Procedure 2 – Fuse on page 12-13
Neutral switch failure (failed open)
Test Procedure 17 – Neutral Switch
Transmission shifter linkage is binding or is
out of adjustment
Forward/Reverse Shifter Cable Adjustment on
Engine does not start (starter motor does not
function).
Diode 1, 2, 5, or 6 failed closed
Test Procedure 12 – Wire Harness Diodes on
Incorrect nozzle opening pressure
Injection nozzle clogged
Failed injection pump
Fuel overflow pipe clogged
Fuel leak caused by loose injection pipe
retaining nut
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Fuel pump failure
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Air filter is dirty or clogged
Air Filter Replacement on page 16-21
Fuel filter clogged or dirty
Engine does not run smoothly.
Water or dirt in the fuel system
Muffler or exhaust pipe restricted with carbon
or other substance
Air filter is dirty or clogged
Air Filter Replacement on page 16-21
Throttle linkage out of adjustment
Engine Control Linkages on page 16-18
Restricted fuel flow
Clutches are not backshifting properly
Low cylinder compression
Incorrect injection timing
Seized engine parts
Uneven fuel injection
Loss of engine power.
Poor injection nozzle performance
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
TABLE CONTINUED ON NEXT PAGE
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Page 12-3
Содержание Carryall 1500 2016
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