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Home >> Chevrolet >> 1998 >> Venture Base, Van Passenger Extended >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1689 - TCS Delivered Torque Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition off. Disconnect PCM harness connector. Turn ignition on, engine off. Check voltage between ground and 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 for about minutes between ground and delivered torque control circuit at PCM harness connector. If current reads .001-.500 amps, go to step 11). If current does not read .001-.500 amps, go to next step.
  4. Turn ignition off. Disconnect EBTCM harness connector. Check voltage between ground and delivered torque control circuit. If voltage reading is zero volts, go to step 10). If voltage reading is not zero volts, go to next step.
  5. Locate and repair short to voltage in delivered torque control circuit. After repairs, go to step 16).
  6. Turn ignition off. Check ignition feed fuse to EBTCM. If fuse is blown, go to next step. If fuse is okay, go to step 8).
  7. Locate and repair short to ground in ignition feed circuit to EBTCM. Replace fuse. After repairs, go to step 16).
  8. Turn ignition off. Disconnect EBTCM harness connector. Turn ignition on. Check voltage between ground and ignition feed circuit for EBTCM. 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 for an open or short in the delivered torque control circuit. Repair as necessary. After repairs, go to step 16). If circuit is okay, go to next step.
  10. Check for delivered torque control circuit for poor connection at PCM and EBTCM. Check EBTCM ignition feed circuit for poor connection at EBTCM. Repair as necessary. After repairs, go to step 16). If circuits are okay, go to step 14).
  11. Turn ignition off. Reconnect PCM harness connector. Disconnect EBTCM harness connector. Connect a test light between delivered torque control circuit and ignition feed circuit at EBTCM harness connector. Using scan tool, cycle the delivered torque output on and off. If test light turns on and off, see DIAGNOSTIC AIDS. If test light does not turn 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 connections are okay, go to step 15).
  13. Locate and 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 scan tool, monitor SPECIFIC DTC info for this DTC until DTC test runs. If scan tool indicates that this DTC failed this ignition, repeat step 2). If scan tool does not indicate that this DTC failed this ignition, system is okay.
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