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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Transfer Case - Mp 3010 (NP0)) >> Diagnostic Information And Procedures >> DTC P2160 Or P2161: Vehicle Speed Sensor (VSS) 2 Circuit (2-Wire) >> Component Testing >> ECM

Component Testing: ECM

WARNING: This page is about a different car, the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, and 2018 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
  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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