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2002
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Blazer 4D Utility, 4WD, Part Time
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Charging System
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Diagnostic Tests
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DTC P0622: Out Of Range Duty Cycle Signal
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Conditions For Setting DTC
Conditions For Setting DTC
During the ignition ON test, the PCM detects a PWM signal is out of range.
During the RUN test, the PCM detects a PWM signal less then 5 percent for more than 6 seconds.