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Home >> Oldsmobile >> 1997 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1653 - Traction Control System (TCS) Delivered Torque Control Circuit >> Diagnostic Procedures

Diagnostic Procedures

  1. Perform ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK. See the BASIC TESTING - 3.8L article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. After performing OBD system check, go to next step.
  2. Turn ignition off. Disconnect PCM connectors. Turn ignition on. Using a DVOM, check voltage between engine ground and PCM harness connector delivered torque circuit. If voltage is 9-16 volts, go to next step. If voltage is not as specified, go to step 6).
  3. Using DVOM in 10-amp scale, check current between engine ground and delivered torque circuit for 2 minutes. If current remains between .001 and 0.5 amp, go to step 11). If current does not remain as specified, go to next step.
  4. Turn ignition off. With PCM connectors disconnected, disconnect EBTCM connector. Ignition on. Using DVOM, check voltage between engine ground and delivered torque circuit. If voltage is zero volts, go to step 10). If voltage is greater than zero volts, go to next step.
  5. Locate and repair short to voltage in delivered torque circuit. After repairs, go to step 16).
  6. Check EBTCM ignition feed fuse. If fuse is blown, go to next step. If fuse is okay, go to step 8).
  7. Locate and repair short to ground in EBTCM ignition feed circuit. Replace fuse. After repairs, go to step 16).
  8. Disconnect EBTCM connector. Turn ignition on. Check voltage between engine ground and EBTCM ignition feed circuit. If battery voltage is present, go to next step. If battery voltage is not present, go to step 13).
  9. Check delivered torque circuit for open or short to ground. If a problem is found, repair as necessary. After repairs, go to step 16). If no problem is found, go to next step.
  10. Check delivered torque driver and delivered torque ignition feed circuits for faulty connection at EBTCM and PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to step 14).
  11. Turn ignition off. Reconnect PCM connectors. Disconnect EBTCM connector. Turn ignition on. Connect a test light between EBTCM harness connector delivered torque and ignition feed circuits. Using scan tool, cycle 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 circuit for faulty connection at PCM. If faulty connection is found, repair as necessary. After repairs, go to step 16). If connection is okay, go to step 15).
  13. Locate and repair open EBTCM ignition feed circuit. After repairs, go to step 16).
  14. Replace EBTCM. After replacing module, go to step 16).
  15. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
  16. Using scan tool, read and record FAIL RECORDS DATA, and clear DTCs. Operate vehicle within conditions noted in FAIL RECORDS data. Using scan tool, select SPECIFIC DTC INFO for DTC P1653. If scan tool displays DTC P1653 FAILED THIS IGN, return to step 2). If scan tool does not display DTC P1653 FAILED THIS IGN, repair is complete.
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