Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSBUICK2000PARK AVENUE BASE, 3.8 KREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 3.8LSELF-DIAGNOSTIC SYSTEMDLC DIAGNOSIS OR NO SCAN TOOL DATA
2000 Buick Park Avenue Base, 3.8 K
DLC Diagnosis Or No Scan Tool Data
2000 Buick Park Avenue Base, 3.8 KSECTION DLC Diagnosis Or No Scan Tool Data
NOTE:
Perform On-Board Diagnostic (OBD) system check after completing any repairs. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK .
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- 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.
- 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.
- Turn ignition on, with engine off. Using DVOM connected to ground, probe class 2 serial data circuit at DLC. 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.
- Turn ignition off. Disconnect PCM harness connectors. Turn ignition on, with engine off. Using DVOM connected to battery positive, probe class 2 serial data circuit at DLC. 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.
- Check for open in class 2 serial data circuit between DLC and PCM. Repair as necessary. If circuit is okay, go to step 11.
- Check for short to voltage in class 2 serial data circuit. Repair as necessary. If circuit is okay, go to step 11.
- Locate and repair short to ground in class 2 serial data circuit.
- Locate and repair open in DLC ground circuits.
- Locate and repair open or short to ground in DLC battery feed circuit.
- Replace PCM. Perform PCM relearn procedures.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.