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Home >> GMC >> 2011 >> Canyon 4D Pickup, 2.9 9 >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications System >> Diagnostic Information and Procedures >> DTC U1651 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector of the appropriate sensor.
  2. Test for less than 10 Ω between sensor connector terminal and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the sensor B+ connector terminal and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open and the circuit tests normal, replace the sensor.
  4. Ignition OFF, disconnect the harness connector at the EBCM.
  5. Ignition ON, test for less than 3 V at the appropriate CAN bus terminals:
    • If greater than the specified range, test the circuits for a short to voltage.
  6. Test for greater than 5 Ω between the appropriate CAN bus connector terminals and ground:
    • If less than the specified range, test the circuits for a short to ground.
  7. Test for greater than 5 Ω between appropriate CAN bus terminals.
    • If less than the specified range, test for a short between the CAN bus serial data circuits.
  8. Test for less than 5 Ω between sensor terminal and EBCM terminal for each individual CAN bus circuit:
    • If greater than the specified range, test the appropriate serial data circuit for an open/high resistance.
  9. If all circuits test normal, replace the sensor.
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