LEMON Manuals: Even more car manuals for everyone
Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 502 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information and Procedures >> DTC C0306 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the harness connector at the transfer case encoder motor (TCEM).
    2. NOTE:

    When test probing harness terminals, it is imperative to use the proper test probe from the most current version of the J 35616  GM-Approved Terminal Test Kit. Use of an improper test probe may deform the terminal, resulting in intermittent open conditions.

  2. Using the purple probe J 35616-4A, test for a 1.0-2.5 V diagnostic voltage between the motor B circuit, TCEM pin D, and a good ground.
    • If the voltage is greater than the specified range, test the motor B circuit for a short to voltage. If all circuits and connections test normal, test the TCCM.
    • If the voltage is less than the specified range, test the motor B circuit for an open/high resistance or short to ground. If all circuits and connections test normal, test the TCCM.
  3. Using the purple probes J 35616-4A, test for a diagnostic B+ (+0.0/-1.0 V) between the motor A circuit, TCEM harness pin A, and a good ground.
    • If the voltage is less than the specified range, test the motor A circuit for an open/high resistance, short to ground or short together condition. If all circuits and connections test normal, test the TCCM.
  4. Remove the encoder motor from transfer case. Using a paint pen or marker, place indexing marks on the encoder motor output gear and the mounting surface of the encoder motor.
  5. Connect the connector at the transfer case encoder motor (TCEM). Position the TCEM so that the indexing marks are visible from the side of the vehicle.
  6. Remove key. Wait 30 seconds. Key ON, engine OFF. Clear codes.
  7. Block wheels. Parking brake engaged. Transmission in Neutral. Using the Transfer Case Motor Control function of the Special Function feature of the scan tool, command the encoder motor forward and reverse. When commanded forward, the encoder motor drive gear should rotate in one direction. When commanded reverse, the encoder motor drive gear should rotate in the opposite direction.
    • If the encoder motor drive gear is unable to rotate, test the TCEM.
  8. Inspect the transfer case actuator shaft gear for a binding condition. If binding, remove the transfer case and repair the binding condition.
  9. Test the TCEM.
scientia non olet · About LEMON Manuals