LEMON Manuals
: Even more car manuals for everyone
Home
>>
Chevrolet
>>
2002
>>
Blazer 4D Utility, 4WD, Part Time
>>
Repair and Diagnosis
>>
Electrical
>>
Charging Systems
>>
Charging System
>>
Diagnostic Tests
>>
DTC P1638: Out Of Range Duty Cycle Signal
>>
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.