LEMON Manuals
: Even more car manuals for everyone
Home
>>
Chevrolet
>>
2003
>>
Corvette Base, 2D Convertible, Standard
>>
Repair and Diagnosis
>>
Electrical
>>
Charging Systems
>>
Diagnostic Tests
>>
DTC P1638: Pulse Width Modulation Signal Out Of Range
>>
Conditions For Setting DTC
Conditions For Setting DTC
During the key ON test, the PCM detects a PWM signal greater than 65 percent for at least 5 seconds.
Or, during the RUN test, the PCM detects a PWM signal less than 5 percent for at least 15 seconds.