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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 799 (Antilock Brake System, Traction Control System & Stability Control System) >> Diagnostic Information and Procedures >> DTC C0253 >> Circuit/System Testing
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Circuit/System Testing

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NOTE: If DTC C0710 is set diagnose it before performing this diagnostic.

  1. Ignition OFF, disconnect the harness connector at the steering angle sensor (SAS).
  2. Test for less than 1.0 ohm of resistance between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  4. Test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and the signal circuit terminal 6.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the EBCM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  5. Ignition OFF, reconnect the SAS.
  6. Disconnect the EBCM harness connector.
  7. Test for infinite resistance between the signal circuit pin 4 and ground.
    • If less than the specified range, test the signal circuit for a short to ground.
  8. Disconnect the SAS.
  9. Reconnect the EBCM harness connector.
  10. Ignition ON, test voltage of phase A phase B, and phase C. verify that the reading is battery positive voltage for each of the three phases.
    • If not the specified value, test the phase A phase B, and phase C circuits for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM.
  11. Ignition OFF, reconnect the SAS. Turn the ignition ON. Turn the steering wheel through its full range and back to straight ahead to center the SAS. Using the scan tool, observe the steering wheel position. The parameter changes smoothly while turning the steering wheel through the entire range and correlate to zero reading with the wheels in a straight ahead position.
    • If the steering wheel position parameter does not change, replace the SAS.
    • If the steering wheel position parameter change, replace the EBCM.
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