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Home >> Chevrolet >> 2000 >> Venture Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1689: Traction Control Delivered Torque Output 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 off. Disconnect PCM harness connector. Turn ignition on. Using a DVOM, check voltage between ground and the delivered torque control circuit at PCM harness connector. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, go to step  6.
  3. Check current between ground and delivered torque control circuit at PCM harness connector for at least 2 minutes. If current reading is 0.001-0.500 amps, go to next step. If current reading is not 0.001-0.500 amps, go to step  11.
  4. Turn ignition off. Disconnect EBTCM harness connector. Leave PCM disconnected. Turn ignition on. Using DVOM, check voltage between ground and delivered torque control circuit at PCM harness connector. If voltage reading is zero volts, go to step  10. If voltage reading is not zero volts, go to next step.
  5. Repair short to voltage in delivered torque control circuit. After repairs, go to step  16.
  6. Turn ignition off. Check ignition feed fuse for EBTCM. If fuse is open, go to next step. If fuse is okay, go to step  8.
  7. Locate and repair short to ground in ignition feed circuit for EBTCM. After repairs, replace fuse, then go to step  16.
  8. Disconnect EBTCM harness connector. Turn ignition on. Check voltage between ignition feed circuit for EBTCM and ground. If voltage reading is about battery voltage, go to next step. If voltage reading is not about battery voltage, go to step  13.
  9. Check delivered torque control circuit for open or short to ground. Repair as necessary. After repairs, go to step  16. If circuit is okay, go to next step.
  10. Check delivered torque control circuit for poor connection at PCM or at EBTCM. Check EBTCM ignition feed circuit for poor connection at EBTCM. Repair as necessary. After repairs, go to step  16. If connections are okay, go to step  14.
  11. Turn ignition off. Reconnect PCM harness connector. Disconnect EBTCM harness connector. Turn ignition on. Connect a test light between delivered torque control circuit and ignition feed circuit at EBTCM harness connector. Using scan tool in OUTPUTS TEST function, cycle the delivered torque output on and off. If test light flashes on and off, see DIAGNOSTIC AIDS . If test light does not flash on and off, go to next step.
  12. Check delivered torque control circuit for poor connection at PCM. Repair as necessary. After repairs, go to step  16. If connection is okay, go to step  15.
  13. Repair open in ignition feed circuit to EBTCM. After repairs, go to step  16.
  14. Replace EBTCM. After replacing EBTCM, go to step  16.
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM , go to next step.
  16. Review and record scan tool FAIL RECORDS data. Clear DTCs. Operate vehicle within FAIL RECORDS conditions. Using a scan tool, monitor Specific DTC info this DTC until DTC test runs. If scan tool indicates that this DTC failed this ignition, go to step  2. If scan tool does not indicate that this DTC failed this ignition, system is okay.
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