Cummins SPN 1322 FMI 31: Significado, Causas y Solución

Yes. A failing crankshaft position sensor can cause the ECM to incorrectly detect misfire events, even when all cylinders are firing properly. This is particularly common on engines with high-mileage CKP sensors that have degraded signal strength. Always verify with a cylinder cut-out test and compression check before replacing injectors or doing internal engine work.

A single cylinder misfire allows limited driving to reach a repair facility, but you should avoid heavy loads and high RPM. Unburned fuel from the misfiring cylinder enters the exhaust and can saturate the DPF, causing regen failures and potential DPF damage. Extended operation with a misfire also risks cylinder wash-down, where fuel dilutes the oil film and causes accelerated ring and liner wear.

A single new OEM fuel injector for a heavy-duty diesel engine costs $400–$900, plus 2–4 hours of labor. Remanufactured injectors cost $250–$500. When one injector fails on a high-mileage engine (500,000+ miles), consider replacing all injectors as a set — the remaining injectors are likely approaching end of life, and replacing them all at once saves repeated labor costs.

Consider an overhaul when: multiple cylinders show low compression, oil consumption exceeds 1 gallon per 5,000 miles, or the engine has 800,000+ miles with recurring mechanical faults. An in-chassis overhaul (rings, liners, bearings) costs $12,000–$20,000, while a full out-of-chassis rebuild costs $18,000–$35,000. Compare this to the $8,000–$15,000 in cumulative repairs you might face by continuing to patch individual issues.

Cummins ISX15 recommends overhead adjustment every 250,000 miles or at the first sign of valve train noise. Detroit DD15 specifies 150,000-mile intervals. Volvo D13 recommends 200,000 miles. Adjusting valve lash on schedule prevents misfire codes, improves fuel economy, and extends valve train component life. A valve adjustment costs $200–$500 and takes 2–3 hours.

Este código REVISAR EN PRÓXIMA PARADA permite continuar operando hasta un lugar de servicio seguro, típicamente dentro de 80–160 km. Reduzca la carga del motor (evite pendientes pronunciadas, reduzca la velocidad de crucero) y monitoree de cerca los indicadores relacionados. Si aparecen síntomas secundarios — humo, ruido inusual, aumento de temperatura — deténgase inmediatamente.

Si se atiende pronto en la próxima parada, es poco probable que cause daño permanente. Sin embargo, la operación prolongada (más de 300 km) con esta falla activa puede agravar el problema. Por ejemplo, las fallas del sistema DEF eventualmente activarán una reducción completa de potencia y limitación de velocidad a 8 km/h. Algunas condiciones REVISAR EN PRÓXIMA PARADA pueden convertirse en DETENER MOTOR si la causa raíz empeora.

Puede intentar los pasos de diagnóstico indicados arriba. Muchos códigos REVISAR EN PRÓXIMA PARADA tienen causas sencillas — niveles bajos de fluidos, filtros obstruidos o conexiones sueltas — que un propietario-operador puede resolver. Sin embargo, si el código reaparece después de borrarlo, la falla subyacente requiere diagnóstico profesional con una herramienta de escaneo capaz de ver datos en vivo e información de congelación de cuadro.