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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (ANTILOCK BRAKE SYSTEM, TRACTION CONTROL SYSTEM & STABILITY CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0253CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Testing

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

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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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.