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Home >> Oldsmobile >> 1998 >> Regency >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control Systems Tests W/Codes >> Self-Diagnostic System >> DLC Diagnosis Or No Scan Tool Data

DLC Diagnosis Or No Scan Tool Data

  1. Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
  2. Turn ignition on with engine off. Connect a test light between DLC battery feed circuit and ground circuit. See WIRING DIAGRAMS article. If test light illuminates, go to step 4). If test light does not illuminate, go to next step.
  3. Using a test light connected to ground, probe DLC battery feed circuit. See WIRING DIAGRAMS article. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).
  4. Turn ignition on with engine off. Using DVOM connected to ground, probe DLC class 2 serial data circuit. See WIRING DIAGRAMS article. DVOM should read zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 7).
  5. Turn ignition off. Disconnect PCM connector. Turn ignition on with engine off. Using DVOM connected to battery voltage, probe DLC class 2 serial data circuit. See WIRING DIAGRAMS article. DVOM should read zero volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step 8).
  6. Check for open in class 2 serial data circuit between DLC and PCM. Repair as necessary. After repairs, perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . If circuit is okay, go to step 11).
  7. Check for short to voltage in class 2 serial data circuit. Repair as necessary. After repairs, perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . If circuit is okay, go to step 11).
  8. Locate and repair short to ground in class 2 serial data circuit. After repairs, perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK .
  9. Locate and repair open in DLC ground circuits. After repairs, perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK .
  10. Locate and repair open or short to ground in DLC battery feed circuit. After repairs, perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK .
  11. Replace PCM. Perform PCM relearn procedures. After repairs, perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK .
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