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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 338 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC P2160 or P2161 >> Circuit/System Testing

Circuit/System Testing

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  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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