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Volvo Engine Code MID 128 PSID 109 FMI 12
MID 128 PSID 109 Engine Coolant Temperature Sensor Type of fault: FMI 12 FMI Description: • Thermostat blocked open Fault Condition: • This fault will become active when the Engine Management System (EMS) Module detects that the Engine Coolant Temperature (ECT) Sensor output is low but still with in the acceptable range for the sensor. Possible Symptoms: • Poor heat in cab • Malfunction indicator lamp illuminated Possible Cause: • Thermostat Blocked Open