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 13 (BODY CONTROL MODULE)DIAGNOSTIC TESTSDTC B1374: IGNITION 1 FAULT (WITH ENGINE RUNNING)TESTING
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
DTC B1374: Ignition 1 Fault (With Engine Running): 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 24-pin connector C2, terminal B9 (Pink wire). Using DVOM, check voltage between BFC harness connector C2, terminal B9 (Pink 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 C2, terminal B9 (Pink wire). If a poor connection exists, go to next step. If connection is okay, go to step 5).
- Repair poor connection at BFC connector C2, terminal B9 (Pink wire). Go to step 11).
- Replace BFC. See REMOVAL & INSTALLATION . Go to step 11).
- Disconnect underhood wiring harness junction block Brown 68-pin Brown connector C3, terminal C4 (Pink wire). Using DVOM, check resistance between BFC harness connector C2, terminal B9 (Pink wire) and underhood wiring harness junction block harness connector C3, terminal C4 (Pink 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 Pink wire between BFC connector C2 and underhood wiring harness junction block connector C3. Perform procedures in step 11).
- Check for a poor connection at underhood wiring harness junction block connector C3, terminal C4 (Pink wire). If a poor connection exists, go to next step. If connection is okay, go to step 10).
- Repair poor connection at underhood wiring harness junction block connector C3, terminal C4 (Pink wire). Go to step 11).
- Replace underhood wiring harness junction block connector. Go to next step.
- Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK .
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.