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Home >> Chevrolet >> 1997 >> Venture LS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1571 - Traction Control System Desired Torque Circuit >> Diagnostic Procedures
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Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. 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 near 100 percent, go to step 4). If not, 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 is 5 volts, go to next step. If voltage is not as specified, 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 as specified, 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 as specified, 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. If a problem is found, repair as necessary. After repairs, go to step 11). If no problem is found, 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 repair is completed, go to next step.
  11. Clear DTCs. Turn ignition on and observe DESIRED TORQUE PWM scan tool display. If scan tool displays about 100, repair is complete. If scan tool does not display about 100 percent, return to step 2)
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