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Home >> Chevrolet >> 2000 >> Venture Value >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1571: Traction Control Torque Request Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC SYSTEM CHECK . After performing OBD system check, go to next step.
  2. Turn ignition on, with engine off. Using scan tool, observe traction control desired torque. If desired torque is at or about 100 percent, go to step  4. If desired torque is not at or about 100 percent, go to next step.
  3. Turn ignition off. Disconnect Electronic Brake and Traction Control Module (EBTCM) connector. Turn ignition on. Using a DVOM, check voltage between engine ground and EBTCM harness connector desired torque PWM circuit. If voltage reading is 5 volts, go to next step. If voltage reading is not 5 volts, go to step  6.
  4. Turn ignition off. Connect ABS/TCS Pinout Box and Adapter (J39700-25) between EBTCM and EBTCM connector. Using DVOM in Hertz (Hz) scale, check frequency between engine ground and desired torque PWM circuit. Turn ignition on. If frequency is 120-135 Hz, go to next step. If frequency is not 120-135 Hz, go to step  7.
  5. Using DVOM in duty cycle scale, check duty cycle between engine ground and desired torque PWM circuit. Turn ignition on, with engine off. If duty cycle is 10-95 percent, go to step  9. If duty cycle is not 10-95 percent, go to step  7.
  6. Turn ignition off. Disconnect PCM harness connector. Turn ignition on. Check desired torque PWM circuit for open, short to ground or short to voltage. Repair as necessary. After repairs, go to step  11. If circuit is okay, go to step  9.
  7. Check for poor connection at EBTCM. Repair as necessary. After repairs, go to step  11. If connection is okay, go to next step.
  8. Replace EBTCM. After replacing EBTCM, go to step  11.
  9. Check for poor connection at PCM. Repair as necessary. After repairs, go to step  11.
  10. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  11. Clear DTCs. Turn ignition on and observe DESIRED TORQUE PWM scan tool display. If scan tool indicates that about 100, system is okay. If scan tool does not indicate about 100 percent, return to step  2.
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