Lit. No. 27366, Rev. 01 February 15, 2008
62
TROUBLESHOOTING GUIDE
INTRODUCTION
All malfunctions of the MVP PLUS™
snowplow can be categorized as
structural, electrical or hydraulic.
Structural issues are generally
related to the blade wings, T-frame,
lift frame and mount components and
are usually identified by visual
inspection. However, electrical and
hydraulic issues can be difficult to
trace.
Read and understand the Theory
of Operation before attempting
troubleshooting.
Because of the relative complexity of
the MVP PLUS snowplow electrical
and hydraulic systems, some
conditions must be eliminated in
order to develop valid tests.
If the listed conditions are not met,
the procedure can result in
inaccurate results and wasted time.
In many cases, satisfying the listed
conditions alone solves the problem.
1. Go to the Before You Begin
section (next page), and satisfy
the listed conditions. These
conditions must be met before
proceeding to any of the tables
and tests that follow.
2. If a lighting problem exists,
proceed to the proper Headlamp
Troubleshooting tables for a list
of basic test questions and
solutions to common problems.
3. If still having problems or the
problem is not related to the
headlamps, go to the Hydraulic
System Testing Section.
4. Follow along sequentially
through the tables and tests,
referring to the Hydraulic &
Electrical Schematics and
System Overview sections as
needed. Eventually the problem
is identified at the component
level.
ELECTRICAL TESTING
Read and understand the electrical
circuit operation information in the
Theory of Operation section. A
simple 12-volt (12V) test light with a
ground lead can be used for circuit
testing in most cases. The exception
is the paired multiplex wiring, which
carries a low level signal from the
control to the Plow Module.
When directed to check for 12V,
ground the test lamp lead and probe
the terminal. When asked to check
for ground, attach the test lamp lead
to +12V and probe the terminal.
NOTE: 12V is a nominal value. If
using a voltmeter, actual voltage
will vary with the vehicle and
presence of loads in tested
circuits. Continuity alone does not
guarantee a good circuit. Poor
connectors or damaged wires may
have continuity but be unable to
carry sufficient current.
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