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HOMESERVICE MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM - DELPHI 7DIAGNOSTIC TESTSDTC C1276: DELIVERED TORQUE SIGNAL CIRCUIT MALFUNCTION
2000 Buick Century Custom

DTC C1276: Delivered Torque Signal Circuit Malfunction

2000 Buick Century CustomSECTION DTC C1276: Delivered Torque Signal Circuit Malfunction
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
  2. Check EBCM ground connections on transaxle stud, near starter. Ensure each ground is clean and tightened properly. Clean and retighten as necessary. After repairs, go to step  11 . If ground is okay, go to next step.
  3. Install scan tool. Start engine. Using scan tool, observe delivered torque parameter in ABS/TCS data list. If scan tool displays a range of 5-95 percent, go to next step. If scan tool does not display a range of 5-95 percent, go to step  5 .
    NOTE: DO NOT turn ignition on while EBCM is disconnected.
  4. Turn ignition off. Disconnect EBCM harness connector. Install Universal Breakout Box (J 39700) using Cable Adapter (J 39700-99) to EBCM harness connector and EBCM. Start engine. Using a DVOM in DC Hz mode, check frequency between the delivered torque signal circuit and ground. If frequency reading is 121-134 Hz, go to step  8 . If frequency reading is not 121-134 Hz, go to step  9 .
  5. Check for open in delivered torque signal circuit. Repair as necessary. After repairs, go to step  11 . If circuit is okay, go to next step.
  6. Check for short to ground in delivered torque signal circuit. Repair as necessary. After repairs, go to step  11 . If circuit is okay, go to next step.
  7. Check for short to voltage in delivered torque signal circuit. Repair as necessary. After repairs, go to step  11 . If circuit is okay, go to next step.
  8. Check EBCM harness connector for poor connections or terminal tension. Repair as necessary. After repairs, go to step  11 . If connections or terminals are okay, go to step  10 .
  9. Check PCM. Perform Powertrain On-Board Diagnostic (OBD) System Check. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. After performing OBD system check, go to step  11 .
  10. Replace EBCM. After replacing EBCM, go to next step.
  11. Using scan tool, clear DTCs. Turn ignition on and recheck for DTCs. If DTC resets, go to step  2 . If DTC does not reset, system is okay.
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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.