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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 >> Diagnostic Information and Procedures >> Diagnostic Trouble Code (DTC) Displaying >> TCCM Self-Test

TCCM Self-Test

  1. Observe the transfer case shift control switch indicators while turning the ignition switch to RUN. A properly operating system will flash all indicators and then will return to the current gear. If the system is operating normally, then proceed to Displaying Codes.
  2. If the TCCM failed the Self-Test, then test the following circuits.
    • Battery Positive Voltage (40 and 1640), and Ignition 3 Voltage for battery voltage
    • Ground Circuit for ground
    • Transfer case shift control switch connector
  3. If the above circuits are normal but the TCCM still fails the Self-Test, replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .
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