Intake Air Temperature (IAT) Circuit Low Input
¿Qué significa esto?
Code P0112 indicates the IAT sensor is sending an abnormally low voltage signal (indicating high temperature) to the PCM.
Aviso legal: Este código de diagnóstico forma parte del sistema OBD2 estándar y puede aplicarse a los modelos Mercedes-benz S-class fabricados de 1996 a 2026. Sin embargo, tenga en cuenta que la presencia de este código específico depende de la configuración del motor de su vehículo, las opciones y el año de producción.
Causas comunes
Sensor de temperatura del aire de admisión (IAT) defectuoso
Arnés de cableado dañado o roto
Conector eléctrico corroído o suelto
Síntomas a tener en cuenta
- La luz de Check Engine está encendida
- Disminución del rendimiento de combustible
- Ralentí irregular o inestable
Cómo Diagnosticar
Soluciones Comunes
Replace the Intake Air Temperature (IAT) sensor: This is the most frequent solution if the sensor itself is internally shorted, providing incorrect resistance readings, or has failed internally.
Repair or replace damaged wiring or connector: If diagnostic steps reveal a short to ground, an open circuit, or corrosion/damage within the IAT sensor's wiring harness or connector, repairing the specific section or replacing the entire connector/harness segment is necessary.
Address a short to ground in the IAT signal circuit: If the wiring tests indicate the signal wire is shorted to ground, locate and repair the short. This often involves tracing the harness carefully for chafing or damage.
Replace the Powertrain Control Module (PCM): In rare instances, if all sensor and wiring tests confirm integrity, the internal IAT circuit within the PCM itself may be faulty. This should only be considered as a last resort after exhaustive testing of the sensor and wiring.