be 90 percent and the off-time 10 percent.
Charging System Indicator
The IPC illuminates the charge indicator in the message center when the following occurs:
z
The PCM detects that the generator output is less than 11 volts or greater than 16 volts. The IPC receives
a class 2 message from the PCM requesting illumination.
z
The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives
a class 2 message from the body control module (BCM) indicating the system voltage.
z
The IPC performs the displays test at the start of each ignition cycle. The indicator illuminates for
approximately 3 seconds.
z
The ignition is on, with the engine off.
STARTING SYSTEM DESCRIPTION AND OPERATION
The PG-260L is an non-repairable starter motor. It has pole pieces that are arranged around the armature within
the starter housing. When the solenoid windings are energized, the pull-in winding circuit is completed to
ground through the starter motor. The hold-in winding circuit is completed to ground through the solenoid. The
windings work together magnetically to pull in and hold in the plunger. The plunger moves the shift lever. This
action causes the starter drive assembly to rotate on the armature shaft spline as it engages with the flywheel
ring gear on the engine. At the same time, the plunger closes the solenoid switch contacts in the starter solenoid.
Full battery voltage is then applied directly to the starter motor and it cranks the engine.
As soon as the solenoid switch contacts close, current stops flowing thorough the pull-in winding as battery
voltage is now applied to both ends of the windings. The hold-in winding remains energized; its magnetic field
is strong enough to hold the plunger, shift lever, starter drive assembly, and solenoid switch contacts in place to
continue cranking the engine. When the engine starts, the pinion gear overrun sprag protects the armature from
excessive speed until the switch is opened.
When the ignition switch is released from the CRANK position, voltage is removed from the starter solenoid S
terminal. Current flows from the motor contacts through both windings to ground at the end of the hold-in
winding. However, the direction of the current flow through the pull-in winding is now in the opposite direction
of the current flow when the winding was first energized.
The magnetic fields of the pull-in and hold-in windings now oppose one another. This action of the windings,
along with the help of the return spring, cause the starter drive assembly to disengage and the solenoid switch
contacts to open simultaneously. As soon as the contacts open, the starter motor is turned off.
SPECIAL TOOLS AND EQUIPMENT
SPECIAL TOOLS
Special Tools
Illustration
Tool Number/Description
2004 Hummer H2
2004 ELECTRICAL Engine Electrical - Hummer H2