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 13 (BODY CONTROL MODULE)DIAGNOSTIC TESTSDTC U1000: LOSS OF CLASS 2 SERIAL DATA FAULTTESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DTC U1000: Loss Of Class 2 Serial Data Fault: Testing
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Testing
WARNING: This page is about a different car, the 1998 Oldsmobile Cutlass and 1998 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- If BFC diagnostic system check was performed, go to next step. If BFC diagnostic system check was not performed, see procedures in BFC DIAGNOSTIC SYSTEM CHECK .
- Connect scan tool. Turn ignition switch to RUN position. Using scan tool, establish communication with BFC. If communication can be established, go to next step. If communication cannot be established, go to step 4).
- Using scan tool, establish communication with other modules. If communication can be established, go to step 5). If communication cannot be established, go to next step.
- Locate and repair problem in DLC system. See WIRING DIAGRAMS . Go to step 7).
- Clear DTCs. Check for DTCs. If DTC U1000 exists, go to next step. If DTC U1000 does not exist, go to step 7).
- Replace BFC. See REMOVAL & INSTALLATION . Go to next step.
- Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK .
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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.