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Home >> Cadillac >> 2013 >> Escalade Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Transfer Case - Mp 3023/3024-NQH) >> Diagnostic Information and Procedures >> DTC P2160 or P2161 >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.

VSS

  1. Key OFF.
  2. Disconnect the X1 connector from the VSS. Using the J 35616-3 GY probes, test for 1200-2140 Ω between the VSS high signal circuit, VSS pin A, and the VSS low signal circuit, VSS pin B.
    • If the resistance is outside the specified value, replace the VSS.
  3. Test for greater than 10 M Ω between the following circuits and a good ground.
    • VSS high signal circuit, VSS pin A.
    • VSS low signal circuit, VSS pin B.
      • If the resistance is below the specified value, Replace the VSS.
  4. Block the front wheels. Raise and support the driver's side rear wheel. While rotating the raised wheel by hand, test for greater than 0.4 V AC between the VSS high signal circuit, VSS pin A, and the VSS low signal circuit, VSS harness pin B. The passenger side rear wheel takes more effort to turn. If both drive wheels are raised and unblocked, twice the effort will be required to reach 0.4 V AC. If the vehicle is sufficiently supported to safely place the transmission in neutral, less effort will be required to turn the raised wheel.
    • If the AC voltage is below the specified value, replace the VSS.

ECM

  1. Remove key from the ignition. Let sit for 2 minutes to ensure ECM shut down
  2. Disconnect the X1 connector from the ECM. Using the J 35616-64B L-BU probes, test for 1200-2140 Ω between the VSS high signal circuit, ECM X1, pin 71 and the VSS low signal circuit, ECM X1, pin 72.
    • If the resistance is below the specified value, test the affected circuits for being shorted together. If all circuits and connections test normal, test the VSS for proper operation.
    • If the resistance is above the specified value, test the affected circuits for open/high resistance condition. If all circuits and connections test normal, test the VSS for proper operation.
  3. Using the J 35616-64B L-BU probes, test for greater than 1 M Ω between the following circuits and a good ground.
    • VSS high signal circuit, ECM harness X1 pin 71.
    • VSS low signal circuit, ECM harness X1 pin 72.
      • If the resistance is below the specified value, test the affected circuit for being shorted to ground. If all circuits and connections test normal, test the VSS for proper operation.
  4. Reprogram the ECM. If the DTC continues to set, replace the ECM.
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