11
Test Procedures
TROUBLESHOOTING AND ELECTRICAL
SYSTEM: GASOLINE VEHICLES
_
DIODE TROUBLESHOOTING GUIDE
DIODE
IN-LINE WIRE
LOCATION
(WIRES)
FUNCTION
FAILURE
CONDITION
SYMPTOM/COMMENT
Open
Will contribute to the premature failure
of the limit switch (switch is only used
in AWD vehicle).
Diode 1
w32 and w35
Front differential coil flyback diode
(only used in AWD applications but
still present in 2-wheel drive vehicle
harness)
Closed
The 10-amp fuse (on w109) will blow
repeatedly, with the key ON & pedal
depressed, until the diode has been
replaced.
Open
Difficult starting or not start at all
Diode 2
w40 and w41
Blocking diode for carburetor solenoid
control (powers carburetor solenoid
when key switch is in the START
position)
Closed
Starter will be activated when key
switch is in the ON position.
Open
Difficult starting and engine will shut off
shortly after key switch is moved from
the START to ON position.
Diode 3
w45 and w39
Carburetor solenoid control (powers
carburetor solenoid when key switch is
in the ON position)
Closed
Oil light may illuminate when key is in
START position until oil pressure rises.
Hour meter will be powered when key
switch is in the START position.
Open
Will contribute to the premature failure
of the key switch contacts.
Diode 4
w130 and w122
Carburetor solenoid coil flyback diode
Closed
The 10-amp fuse (on w109) will blow
repeatedly, when key is in ON position,
until the diode has been replaced.
Open
Will contribute to the premature failure
of the start relay contacts.
Diode 5
w131 and w129
Starter solenoid coil flyback diode
Closed
The 25-amp fuse (on w125) will blow
repeatedly, when key is in START
position, until the diode has been
replaced.
Page 11-20
2016 Carryall 1500/1700 and XRT 1550 Maintenance and Service Manual
Summary of Contents for Carryall 1500 2016
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