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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1605 (Transfer Case - Mp 1625/1626-NQF) >> Diagnostic Information and Procedures >> DTC P2160 or P2161 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Key OFF. Let sit for 2 minutes to ensure that the ECM shuts down.
  2. Disconnect the X1 connector from the VSS. Using the J 35616-2A GY probes, test for less than 0.1 V between the following circuits and a good ground.
    • VSS high signal circuit, VSS harness X1 pin A.
    • VSS low signal circuit, VSS harness X1 pin B.
    • If the voltage is greater than the specified value, test the affected circuit for a short to voltage. If all circuits and connections test normal, test the ECM for proper operation.
  3. Key ON, engine OFF. Test for a diagnostic 2-3 V (low current) between the following circuits and a good ground.
    • VSS high signal circuit, VSS harness X1 pin A.
    • VSS low signal circuit, VSS harness X1 pin B.
    • If the voltage is less than the specified value, test the affected circuit for an open/high resistance, short to ground or short together. If all circuits and connections test normal, test the ECM for proper operation.
    • If the voltage is greater than the specified value, test the affected circuit for a short to voltage. If all circuits and connections test normal, test the ECM for proper operation.
  4. Test the VSS for proper operation.
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