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Home >> Chevrolet >> 2011 >> Suburban C2500 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Transfer Case - Mp 3010-NP0) >> Diagnostic Information and Procedures >> DTC C0392 >> Transfer Case Shift Control Module (TCCM)

Transfer Case Shift Control Module (TCCM)

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  1. Key OFF. Disconnect the X1 connector.
  2. Key ON, engine OFF. Connect the EL-49742  harness.
  3. Test for 4.5-5.5 V between the TCCM 5-volt reference pin, TCCM X1 pin 4, and the ground terminal of the EL-49742  harness, black terminal.
    • If the outside the specified range, replace TCCM.
  4. Key OFF.
  5. Connect the TCCM X1 connector. Disconnect the TCCM X2 connector.
  6. Key ON, engine OFF.
  7. Test for B+ (+0.0/-1.0 V) between the TCCM low reference pin, TCCM X2 pin 9, and the B+ terminal of the EL-49742  harness, red terminal.
    • If the outside the specified range, replace TCCM.
  8. Test for B+ (+0.0/-1.0 V) between the TCCM rotational position sensor pin, TCCM X2 pin 11, and the B+ terminal of the EL-49742  harness, red terminal.
    • If the outside the specified range, replace TCCM.
  9. Go to Circuit/System Testing.
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