10.38
ELECTRICAL
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
VOLTAGE DROP TEST
The Voltage Drop Test is used to test for bad connections.
When performing the test, you are testing the amount of
voltage drop through the connection. A poor or corroded
connection will appear as a high voltage reading. Voltage
shown on the meter when testing connections should not
exceed .1 Vdc per connection or component.
To perform the test, place the meter on DC volts and place
th
e meter leads across the connection to be tested. Refer
to the chart on 1.47 to perform voltage drop tests on the
starter system.
Starter Lockout Troubleshooting- EFI
The starter lockout is controlled by the ECU. Pin #52 of the
ECU senses the transmission signal and determines if the
switch is in Neutral or Park. When the conditions are met,
the ECU will activate SSCB #2 Pin 'N' to ground the starter
solenoid.
Pin #35 of the ECU senses when the brake is applied and
ac
tivates Pin #2 pin to ground the solenoid. The ECU will
allow starting in Neutral or Park without the brake applied.
Applying the brake overrides this system and allows
starting regardless of transmission shift position.
Items to check when diagnosing a no-start condition are:
• Transmission switch for proper function
• Starter solenoid for proper function
• Brake switch for proper function
• Wire harness, loose connections/pins (including
th
e ECU) leading to and from these components
• Proper ground to frame
• Proper voltage to solenoid
• Key switch for proper function
Should all these items be fou
nd in working order, the ECU
or starter motor may be at fault.
Starter Lockout Troubleshooting- H.O.
The starter lockout is dependent on the transmission
switch being in Neutral or Park. When the conditions are
met, a ground is activated at the starter solenoid.
Starting is allowed in Neutral or Park without the brake
a
pplied. When the brake is applied, it also grounds the
starter solenoid. Applying the brake overrides the entire
system and allows starting regardless of transmission shift
position.
Items to check when diagnosing a no-start or starter run-
on cond
ition are:
• Transmission switch for proper function
• Starter solenoid for proper function
• Brake switch for proper function
• Wire harness for loose connections, or bad
ha
rness diodes leading to and from these
components
• Proper ground to frame
• Key switch for proper function
Should all these items be found in working order, the
har
ness diodes (non-serviceable) or starter motor may be
at fault.
Voltage should not exceed
.1 Vdc per connection
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