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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 2: Encoder Fault >> 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. Disconnect the connector at the encoder motor. Turn ignition on, with engine off. Measure voltage between the transfer case encoder circuit channels "P", "A", "B", and "C" to ground. Does the voltage measure about 4.8-5.1 volts? If yes, go to step  4. If no, go to next step.
  3. Test the suspect circuit(s) for an open, short to power, or short to ground. Did you find and correct the condition? If yes, go to step  7. If no, go to step  6.
  4. Test the encoder signal ground circuit for an open or high resistance. Did you find and correct the condition? If yes, go to step  7. If no, go to next step.
  5. Replace transfer case encoder motor. After replacing motor, go to step  7.
  6. Replace transfer case shift control module. After replacing module, go to next step.
  7. 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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