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Home >> GMC >> 2005 >> Jimmy Part Time, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Transfer Case >> Transfer Case - NVG 233-NP1 >> Diagnostic Information and Procedures >> Diagnostic Trouble Code (DTC) Displaying >> Transfer Case Shift Control Module (TCCM) Self-Test

Transfer Case Shift Control Module (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
    • Diagnostic enable circuit for an open or high resistance
    • 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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