Chrysler PT Cruiser Service & Repair Manual page 359
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- Owner's manual (491 pages) ,
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- Owner's manual (368 pages)
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PT
CHARGING
DESCRIPTION - CHARGING SYSTEM
OPERATION - CHARGING SYSTEM
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CHARGING
DESCRIPTION - CHARGING SYSTEM
The charging system consists of:
• Generator
• Decoupler Pulley (If equipped)
• Electronic Voltage Regulator (EVR) circuitry
within the Powertrain Control Module (PCM)
• Ignition switch (refer to the Ignition System sec-
tion for information)
• Battery (refer to the Battery section for informa-
tion)
• Inlet Air Temperature (calculated battery tem-
perature 1.6L)
• Battery Temperature Sensor (2.0L, 2.4L, and
2.4L turbo)
• Voltmeter (refer to the Instrument Cluster sec-
tion for information if equipped)
• Wiring harness and connections (refer to the
Wiring section for information)
• Accessory drive belt (refer to the Cooling section
for more information)
OPERATION - CHARGING SYSTEM
The charging system is turned on and off with the
ignition switch. The system is on when the engine is
running and the ASD relay is energized. The ASD
relay is energized when the PCM grounds the ASD
control circuit. This voltage is connected through the
PCM or IPM (intelligent power module) and supplied
to one of the generator field terminals (Gen. Source
+) at the back of the generator.
The generator is driven by the engine through a
serpentine belt and pulley or decoupler pulley
arrangement.
CHARGING
TABLE OF CONTENTS
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ator is controlled by the EVR (field control) circuitry
contained within the PCM. This circuitry is con-
nected in series with the second rotor field terminal
and ground.
Battery temperature is detected using a stand
alone sensor for vehicles having 2.0, 2.4, and 2.4L
Turbo engines. For 1.6L engines vehicles battery
temperature is predicted using the values of 4 exist-
ing sensors inputs. These inputs are Inlet Air Sensor,
Coolant Sensor, Vehicle Speed Sensor, and Fan State
(on/off). The charging lamp will come on if either the
inlet air temperature, coolant temperature, or vehicle
speed sensor fail. If one of these sensors fail the
charging system will default to 13.5 Volts. This tem-
perature data, along with data from monitored line
voltage (ASD voltage sense circuit), is used by the
PCM to vary the battery charging rate. This is done
by cycling the ground path to control the strength of
the rotor magnetic field. The PCM then compensates
and regulates generator current output accordingly
to maintain system voltage at the targeted system
voltage based on battery temperature.
All vehicles are equipped with On-Board Diagnos-
tics (OBD). All OBD-sensed systems, including EVR
(field control) circuitry, are monitored by the PCM.
Each monitored circuit is assigned a Diagnostic Trou-
ble Code (DTC). The PCM will store a DTC in elec-
tronic memory for certain failures it detects. Refer to
On-Board Diagnostics in the Electronic Control Mod-
ules(Refer to 8 - ELECTRICAL/ELECTRONIC CON-
TROL
MODULES/POWERTRAIN
MODULE - DESCRIPTION) section for more DTC
information.
The Check Gauges Lamp (if equipped) monitors:
charging system voltage, engine coolant tempera-
CHARGING
8F - 23
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CONTROL
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