TROUBLESHOOTING AND ELECTRICAL SYSTEM:
GASOLINE VEHICLES
Test Procedures
11
DIODE TROUBLESHOOTING GUIDE
DIODE
IN-LINE WIRE
LOCATION
(WIRES)
FUNCTION
FAILURE
CONDITION
SYMPTOM/COMMENT
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.
TEST PROCEDURE 10 – Diode 1 on wire 32 and 35
See General Warnings, Section 1, Page 1-2.
1.
Disconnect battery and spark plug wire(s).
See Disconnecting the Battery – Gasoline/Diesel Vehicles on
2.
Disconnect the two-pin connector between the front gearcase and the wire harness.
3.
Set the multimeter to the diode test function.
4.
Connect the black (–) probe of the multimeter to the frame (ground).
5.
Connect the red (+) probe of the multimeter to the 18-gauge gray wire (w34) on the two-pin connector (wire
harness side).
6.
The reading should indicate an over limit (no continuity). If the diode conducts current (shows continuity, e.g.
beeps) with the meter probes connected as described, the diode has failed and must be replaced.
Harness Diode Removal on page 13-18.
7.
Reverse the multimeter probes and note the reading. The multimeter should indicate approximately 540 mV,
however, a range of 400-700 mV is acceptable.
8.
If the readings obtained in the previous steps are incorrect, replace the diode.
2008-2012 All-Wheel Drive Maintenance and Service Manual
Page 11-21
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