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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Case - NVG 233-NP1 (Two Speed SELECTABLE) Service >> Description and Operation >> Transfer Case Description and Operation >> Transfer Case Shift Control Module >> RAM/ROM Check

RAM/ROM Check

The transfer case shift control module compares the current internal operating program with a stored operating program. This comparison allows the shift control module to evaluate if the shift control module's RAM and ROM are operating properly. Should the shift control module detect a problem with the internal operating program, a diagnostic trouble code (DTC) of 4 is stored indicating the shift control module's memory is damaged.

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