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 MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 26 (ENGINE CONTROL SYSTEM - TESTS W/CODES - INTRODUCTION)SELF-DIAGNOSTIC SYSTEMDLC DIAGNOSIS OR NO SCAN TOOL DATA4.6L
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DLC Diagnosis Or No Scan Tool Data: 4.6L
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION 4.6L
WARNING: This page does not describe the selected car, but rather 68 other vehicles, including the 1999 Saturn SW2, 1999 Saturn SW1, 1999 Saturn SL2, 1999 Saturn SL1, and 1999 Saturn SL. However, it is still accessible from the selected car via links, so may be relevant.
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- Check all PCM power and ground connections and circuits. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary. If connections and circuits are okay, go to next step.
- Ensure battery is fully charged. Using DVOM, measure voltage between DLC battery feed circuit and DLC ground circuits. See appropriate wiring diagram in WIRING DIAGRAMS article. Voltage reading for both circuits should be 10 volts or greater. If voltage is as specified, go to step 7. If voltage is not as specified, go to next step.
- Using DVOM, measure voltage between ground and DLC battery feed circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. Voltage reading should be 10 volts or greater. If voltage is as specified, go to next step. If voltage is not as specified, go to step 6.
- Repair open in DLC ground circuit that had low or no voltage. After repairs, go to step 7.
- Repair open or short to ground in DLC battery feed circuit. Replace blown fuse as necessary. After repairs, go to next step.
- Turn ignition on. If scan tool displays PCM data, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . If scan tool does not display PCM data, go to next step.
- Connect scan tool to another vehicle and check for proper operation. If scan tool operates properly, go to next step. If scan tool does not operate properly, go to step 13.
- Reconnect scan tool to original vehicle and enter on-board diagnostics. If on-board diagnostics is entered, go to next step. If on-board diagnostics cannot be entered, diagnose vehicle computer system.
- Using on-board diagnostics display, check all control modules for DTCs. If DTCs are present, diagnose DTCs. See DIAGNOSTIC TESTS in appropriate TESTS W/CODES article. If DTCs are not present, go to next step.
- Check for open in class 2 serial data circuit between DLC and PCM. Repair as necessary. If circuit is okay, go to next step.
- Check DLC terminal connection. Repair as necessary. Exit on-board diagnostics. Reconnect scan tool. If scan tool displays PCM data, perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . If scan tool does not display PCM data, go to step 14.
- Replace faulty scan tool.
- Replace PCM. Perform PCM relearn procedures.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.