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.
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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2 (INSTRUMENT PANEL - ANALOG)SELF-DIAGNOSTIC SYSTEMSCAN TOOL INOPERATIVE
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
Scan Tool Inoperative
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Scan Tool Inoperative
WARNING: This page is about a different car, the 1999 Pontiac Grand Am and 1999 Oldsmobile Alero. However, it is still accessible from the selected car via links, so may be relevant.
- Remove scan tool from DLC. Connect test light between ground and DLC terminal No. 16 (Orange wire). See WIRING DIAGRAMS . Also see appropriate wiring diagram in DATA LINK CONNECTORS article in WIRING DIAGRAMS. If test light comes on, go to step 3 . If scan tool does not come on, go to next step.
- Repair open in Orange wire between DLC and ground. Reconnect scan tool. If scan tool powers up, go to DATA LINK COMMUNICATIONS DIAGNOSTIC SYSTEM CHECK . If scan tool does not power up, go to next step.
- Connect test light between DLC terminals No. 5 (Black/White wire) and No. 16 (Orange wire). If test light comes on, go to step 5 . If scan tool does not come on, go to next step.
- Repair open in Black/White wire between left instrument panel junction block and DLC. Reconnect scan tool. If scan tool powers up, go to DATA LINK COMMUNICATIONS DIAGNOSTIC SYSTEM CHECK . If scan tool does not power up, go to next step.
- Connect test light between DLC terminals No. 4 (Black wire) and No. 16 (Orange wire). If test light comes on, go to next step. If scan tool does not come on, go to step 7 .
- Scan tool may be inoperative. Check scan tool manufacture's manual. After repairs, go to DATA LINK COMMUNICATIONS DIAGNOSTIC SYSTEM CHECK .
- Repair open in Black wire between DLC and ground. Reconnect scan tool. If scan tool powers up, go to DATA LINK COMMUNICATIONS DIAGNOSTIC SYSTEM CHECK . If scan tool does not power up, go to step 6 .
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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.