ELECTRICAL
10.29
STARTER SYSTEM
TROUBLESHOOTING
Starter Motor Does Not Turn
G
Battery discharged - low specific gravity
G
Loose or faulty battery cables or corroded
connections (see Voltage Drop Tests)
G
Related wiring loose, disconnected, or
corroded
G
Poor ground connections at battery cable,
starter motor or starter solenoid (see
Voltage Drop Tests)
G
Faulty starter button
G
Faulty ignition switch (Do other systems
function?)
G
Faulty starter solenoid or starter motor.
G
Engine problem - seized or binding (Can
engine be rotated easily with recoil
starter?)
Starter Motor Turns Over Slowly
G
Battery discharged - low specific gravity
G
Excessive
circuit
resistance
-
poor
connections (see Voltage Drop Test
below)
G
Engine problem - seized or binding (Can
engine be rotated easily with recoil
starter?)
G
Faulty or worn brushes in starter motor
G
Automatic compression release inoperative
Starter Motor Turns - Engine Does Not Rotate
G
Faulty starter drive
G
Faulty starter drive gears or starter motor
gear
G
Faulty flywheel gear or loose flywheel
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 the meter leads across the connection to be
tested. Refer to the chart on next page to perform
voltage drop tests on the starter system.
Voltage should not exceed:
1 DC volts per connection
STARTER LOCKOUT
TROUBLESHOOTING
The starter lockout is controlled by the PDM. Pin ’G’
of the PDM senses the transmission signal and
determines if the switch is in Neutral or Park. When
the conditions are met, the PDM will activate Pin ’A’ to
ground the starter solenoid. Pin ’B’ of the PDM senses
when the brake is applied. The PDM 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:
G
Transmission switch for proper function
G
Starter solenoid for proper function
G
Brake switch for proper function
G
Wire harness, loose connections/pins
(including the PDM) leading to and
from these components
G
Proper ground to frame
Should all these items be found in working order, the
PDM may be at fault.
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Summary of Contents for 2009 Trail Blazer 330
Page 94: ...ENGINE 3 48 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 110: ...FUEL SYSTEM CARBURETION 4 16 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 124: ...BODY STEERING SUSPENSION 5 14 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 196: ...ELECTRICAL 10 4 REVERSE LIMIT SYSTEM P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 226: ...ELECTRICAL 10 34 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 227: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BOSS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 228: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BOSS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 229: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BLAZER P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 230: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BLAZER P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...