12
Troubleshooting Guide
TROUBLESHOOTING AND ELECTRICAL
SYSTEM: DIESEL VEHICLES
TROUBLESHOOTING GUIDE
SYMPTOM
POSSIBLE CAUSES
REFER TO
Failed front drive gearcase engagement coil
Test Procedure 20 – Front Drive Gearcase
Failed differential limit switch
Test Procedure 19 – Front Differential Limit
Neutral switch failure (failed closed)
Test Procedure 17 – Neutral Switch
Front differential does not engage front wheels.
Failed front gearcase
Drive belt is worn, cracked, glazed, or frayed
Drive Belt Removal on page 16-27
Drive clutch malfunction
Drive Clutch Cleaning and Inspection on page
Torque converter does not shift smoothly.
Driven clutch malfunction
Loose alternator belt
See Alternator and V-belt Installation on
Loose electrical connection(s)
Check for proper wiring and tighten any
loose connections. See Wiring Diagram on
page 11b6.
Failed alternator
Test Procedure 21 – Alternator on page 12-33
Failed battery
Test Procedure 1 – Battery on page 12-12
Battery discharged.
60-amp fusible link failed
Test Procedure 22 – 60-Amp Fusible Link on
Hour meter adds increments with key switch
ON and engine not running.
Oil pressure switch failed open
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Failed low oil warning light or oil pressure
sensor
Test Procedure 29 – Low Oil Warning Light
Oil pressure switch failed closed
See the Kubota D722 diesel engine manual
(CC P/N 103840201).
Hour meter does not function.
Failed hour meter
Test Procedure 33 – Hour Meter on page 12-41
30-amp fuse (on w125) blows repeatedly.
Diode 1 or diode 5 in wire harness failed
Test Procedure 13 – Diode 1 on wire 32 on
page 12-27 and Test Procedure 15 – Diode 3
30-amp fuse (on w109) blows repeatedly.
Diode 2 or diode 6 in wire harness failed
Test Procedure 14 – Diode 2 on wire 40 on
page 12-27 and Test Procedure 16 – Diode 4
Bed lift motor failed
Test Procedure 36 – Bed Lift Motor on page
Bed lift switch failed
Test Procedure 37 – Bed Lift Switch on page
Bed lift does not function
Bed lift circuit breaker failed
Test Procedure 38 – Bed Lift Circuit Breaker
Page 12-6
2008-2012 All-Wheel Drive Maintenance and Service Manual
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