Western Snowplows Midweight Series, Mechanic'S Manual

Page: 88 / 104

Lit. No. 48163, Rev. 00 March 15, 2016
88
TROUBLESHOOTING
NOTE: See the Controls section for details on
control time-outs and blade 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 harness B is 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.
NOTE: The 29290-1 Diagnostic Harness Kit
can be used with or without the snowplow
connected to a vehicle. Follow the appropriate
instructions for each testing situation.
3. When instructed to do so, perform the SCAT
test by activating the control for each function
and checking for magnetic pull at all three
solenoid coils. A solenoid coil is magnetized if
a screwdriver held nearby is attracted.
SOLENOID COIL ACTIVATION TEST (SCAT) — Snowplows with FLEET FLEX Electrical System
4. Compare the SCAT test results with the testing
charts on the following pages.
5. If the motor relay LED is not activating when
it should, go to the Motor and Motor Relay
Test .
6. If one or more coils are not magnetizing when
they 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 the function
that should energize the coil(s). 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 .
7. If the motor relay and all coils are working
properly, you have a hydraulic problem. Go to
the Hydraulic System Test .
S1
S2
S3
Solenoid Coils