Neon L4-2.0L SOHC (1995)
Voltage Signal: Description and Operation
Charging System Voltage Too High
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.
THEORY OF OPERATION:
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 sensor and the sensed
voltage system voltage at PCM pin # 11. The control voltage is compared to the sensed voltage continuously during running. If the sensed voltage
is less than the control voltage the PCM will supply more ground to the field circuit. If the sensed voltage is more than the control voltage the
PCM will supply less ground to the field circuit.
POSSIBLE CAUSES:
-
Generator internal short
-
Generator field driver short to ground
-
The sensed battery voltage is less than actual
-
Powertrain control module failure
