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Home >> Saturn >> 2001 >> L300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1637: Generator "L" Terminal Circuit - Low Input >> Code Enable Criteria

Code Enable Criteria

DTC sets when generator terminal "L" input voltage at ECM is less than 4 volts for more than 3 seconds.

NOTE: DTC may set if generator terminal "L" input is low with engine speed between idle and 1000 RPM. Time to set DTC varies up to one minute.
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