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Home >> Chevrolet >> 1999 >> Blazer 4D Utility, 4WD, Automatic >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Case - Diagnosis - New Venture 233 (SELECTABLE 4WD) >> Diagnostic Tests >> DTC 4: Ram/ROM Failure >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform Diagnostic System Check - Transfer Case? If yes, go to next step. If no, go to DIAGNOSTIC SYSTEM CHECK .
  2. Replace transfer case shift control module. After replacing module, go to next step.
  3. Clear all DTCs from memory. Operate vehicle while pressing each of the buttons on the transfer case shift control switch. Does the DTC reset? If yes, go to step  2. If no, system is okay.
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