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 DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - 3.1LDIAGNOSTIC TROUBLE CODESDTC P1629 - THEFT DETERRENT SYSTEM CRANK SIGNAL MALFUNCTIONDIAGNOSTIC PROCEDURES
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4
Diagnostic Procedures
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Diagnostic Procedures
- Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK , then go to next step.
- Using scan tool, check for any IPC or theft deterrent DTCs. If DTCs are present, diagnose affected DTC first. If DTCs are not set, go to next step.
- Verify if any theft-deterrent system related components was just replaced. If any components were replaced, go to next step. If no components were replaced, go to step 5).
- Perform password learn procedure. Attempt to start engine. If engine starts and continues to run, go to next step. If engine does not start or starts then stall, diagnose electrical system.
- Check serial data circuit for an open or short to ground. Repair as necessary. After repairs, go to step 7). If circuit is okay, go to next step.
- Replace PCM. Program replacement PCM using required equipment. Perform password learn procedure. After replacing PCM, go to step 11).
- Using scan tool, clear DTCs. Start and warm engine to normal operating temperature. Operate vehicle within the conditions for setting this DTC as specified. If scan tool indicates that this diagnostic ran and passed, go to next step. If scan tool does not indicate that this diagnostic ran and passed, repeat step 2).
- Check if any additional DTCs are set. If any DTCs displayed, diagnose affected DTCs. If DTCs are not present, system is okay.
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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.