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 B1369: IGNITION 0 FAULTTESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DTC B1369: Ignition 0 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 .
- Disconnect BFC Gray 16-pin connector C1, terminal A8 (Purple wire). Turn ignition switch to ACC or RUN position. Using DVOM, check voltage between BFC harness connector C1, terminal A8 (Purple wire) and ground. If battery voltage exists, go to next step. If battery voltage does not exist, go to step 6).
- Check for poor connection at BFC connector C1, terminal A8 (Purple wire). If a poor connection exists, go to next step. If connection is okay, go to step 5).
- Repair poor connection at BFC connector C1, terminal A8 (Purple wire). Go to step 11).
- Replace BFC. See REMOVAL & INSTALLATION . Go to step 11).
- Disconnect left I/P wiring harness junction block Brown 68-pin connector C1, terminal C9 (Purple wire). Using DVOM, check resistance between BFC harness connector C1, terminal A8 (Purple wire) and left I/P wiring harness junction block harness connector C1, terminal C9 (Purple wire). If resistance is 0-2 ohms, go to step 8). If resistance is not 0-2 ohms, go to next step.
- Repair open in Purple wire between BFC connector C1 and left I/P wiring harness junction block connector C1. Go to step 11).
- Check for a poor connection at left I/P wiring harness junction block connector C1, terminal C9 (Purple wire). If a poor connection exists, go to next step. If connection is okay, go to step 10).
- Repair poor connection at left I/P wiring harness junction block connector C1, terminal C9 (Purple wire). Go to step 11).
- Replace left I/P wiring harness junction block connector. 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.