Western MVP PLUS Series User Manual

Lit. No. 27366, Rev. 01 February 15, 2008
73
TROUBLESHOOTING GUIDE
NOTE: See the System
Overview – Controls section for
details on control time-outs and
wing functions.
The main purpose of the SCAT test is
to narrow down a problem as either
being electrical or hydraulic. Follow
the steps below to diagnose the
problem, then go to the appropriate
test as directed.
1. Verify that harnesses B and C
are properly attached to the
solenoid coils. Refer to the labels
on the hydraulic unit and the
electrical schematics in this
guide for details.
2. Install the Diagnostic Harness
(PN 29290-1) according to the
instructions on the following
pages.
3. When instructed to do so, perform
the SCAT test by activating the
control for each function and
checking for magnetic pull at all
eleven solenoid coils. A solenoid
coil is magnetized if a screwdriver
held nearby is attracted.
SOLENOID COIL ACTIVATION TEST (SCAT)
44310
S1 S2
S3
SOLENOID VALVE S1 S2 S3
VALVE TYPE SV08-2004 SVCV08-20 SV08-2004
WIRE COLORS WHITE GREEN BLUE
RED RED RED
MODULE CONNECTION PORT B
TORQUE SPECIFICATIONS
ALL SOLENOID VALVES: 19-21 FT-LB
ALL SOLENOID COIL NUTS: 48-60 IN-LB
MOTOR RELAY TERMINALS: SMALL 10-15 IN-LB
LARGE 25-35 IN-LB
MOTOR TERMINALS: 50-60 IN-LB
44319
S4
S5 S6
S7
S8 S9 S10 S11
SOLENOID VALVE S4 S5 S6 S7
VALVE TYPE SVCV08-20 SV08-2004 SF08-2015 SVCV08-20
WIRE COLORS TAN BLACK YELLOW BROWN
RED RED RED RED
SOLENOID VALVE S8 S9 S10 S11
VALVE TYPE SVCV08-20 SV08-2004 SF08-2015 SVCV08-20
WIRE COLORS GRAY WHITE GREEN ORANGE
RED RED RED RED
MODULE CONNECTION PORT C
TORQUE SPECIFICATIONS
ALL SOLENOID VALVES: 19-21 FT-LB
ALL SOLENOID COIL NUTS: 48-60 IN-LB
Harness B Solenoid Coil Connections
Harness C Solenoid Coil Connections
4. Compare the SCAT test results
with the testing charts on the
following pages.
If the motor relay LED is not
activating when it should, go to
the Motor and Motor Relay Test.
If a coil(s) is not magnetizing
when it should be, you have an
electrical problem. Using a test
light, check the ground wires
(not red) attached to the
improperly acting coil(s) for
switched ground while
activating any function on the
control except lower. If switched
ground is not present, go to the
Control/Cable/Plow Module Test.
If switched ground is present, go
to the Individual Solenoid Coil
Test.
If the motor relay and all coils
are working properly, you have
a hydraulic problem. Go to the
Hydraulic System Test.

Western MVP PLUS Series Specifications

General

Brand	Western
Model	MVP PLUS Series
Category	Snow Blower
Language	English