Sebring Convertible V6-2.5L VIN H (1997)
Voltage Signal: Description and Operation
Description of Operation
THEORY OF OPERATION:
The PCM monitors battery voltage input to determine fuel injector pulse width and generator field control voltage.
Injector Pulse Width
If voltage is low the PCM will increase pulse width (the period of time that the injector is energized).
Battery Temperature Sensor
The PCM uses the temperature of the battery area to control the charge rate. The signal is used to regulate the system voltage. The system voltage
is higher at cold temperatures and is gradually reduced as temperature is increased.
Generator Field Voltage
The PCM tries to maintain a system voltage between 12.9 volts and 15.0 volts. The voltage determined by the PCM as the final goal for the
charging system is called "control" voltage. This control voltage is determined from the battery temp sensor for ambient temperature and the
sensed voltage system voltage at PCM pin # 11. The control voltage is compared to the sensed voltage continuously during running.
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If the sensed voltage is less than the control voltage the PCM will supply more ground to the field circuit.
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If the sensed voltage is more than the control voltage the PCM will supply less ground to the field circuit.
NAME OF CODE: Charging System Voltage Too High
When Monitored:
With the ignition key ON and the engine running above 1500 RPM for 1 minute.
Set Condition:
This trouble code sets when the Powertrain Control Module (PCM) tries to regulate the generator field and there are no detected field problems
but, the sensed battery voltage continues to increase.
Possible Causes:
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Generator internal short
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Generator field driver short to ground
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The sensed battery voltage is less than actual
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Powertrain control module failure
NAME OF CODE: Charging System Voltage Too Low
When Monitored:
With the ignition key ON and the engine running above 1500 RPM for 1 minute.
Set Condition:
With no other charging system codes set. The battery sensed voltage is below the charging goal. The PCM senses the battery voltage, turns off the
field driver and senses the battery voltage again. If the voltages are the same the code is set.
Possible Causes:
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Defects in generator drive belt or adjustment
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High resistance between battery B(+) and generator B(+)
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High resistance between battery B(-) and generator B(-)
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PCM failure
NAME OF CODE: Generator Field Not Switching Properly
When Monitored:
With the ignition key ON and the engine running.
Set Condition:
This trouble code sets when the Powertrain Control Module (PCM) tries to regulate the generator field with no result during monitoring.
Possible Causes:
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Field driver circuit open or shorted
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Generator internal open or short
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Powertrain control module failure
