DTC P0EBF-00: Refrigerant Temperature Sensor (Built Into MAZDA M Hybrid Boost Battery) System: Function Malfunction

P0EBF: 00 (PCM (H3T)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Refrigerant temperature sensor (built into Mazda M Hybrid Boost battery) system: Function malfunction
Detection condition	When the following preconditions are met, the difference between the temperature detected by the refrigerant temperature sensor (integrated with Mazda M Hybrid Boost battery) and the temperature detected by the ambient temperature sensor is outside the specified range, and the difference between the temperature detected by the refrigerant temperature sensor (integrated with Mazda M Hybrid Boost battery) and the saturation temperature calculated from the refrigerant pressure sensor No. 1 output value is outside the specified range continuously for the specified period. Preconditions Before starting the engine, leave the vehicle with the engine turned off for 6 h or more. Battery voltage: 8.0 V or more Refrigerant pressure sensor No. 1: 0.146 MPa {1.49 kgf/cm² , 21.2 psi} or more Mazda M Hybrid Boost battery temperature: -10-45°C {14-113°F} The following DTCs are not detected Refrigerant pressure sensor No. 1 system: P0531: 00, P0532: 00, P0533: 00
Fail-safe	Inhibits the A/C control.
Possible cause	Refrigerant temperature sensor (built into Mazda M Hybrid Boost battery) malfunction (See DTC INSPECTION .) Malfunction in wiring harness (including connector/terminal) between PCM and ambient temperature sensor (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Malfunction in wiring harness (including connector/terminal) between PCM and refrigerant pressure sensor No. 1 (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Ambient temperature sensor malfunction (Refer to [AMBIENT TEMPERATURE SENSOR INSPECTION ] in service information). Refrigerant pressure sensor No. 1 malfunction (Refer to [REFRIGERANT PRESSURE SENSOR INSPECTION ] in service information). PCM malfunction (Refer to [PCM REMOVAL/INSTALLATION ] in service information).
Repeatability verification procedure	Clear the DTC recorded in the memory. (See CLEARING DTC .) Replicate the vehicle conditions at the time the DTC was detected using the following procedure. Start the engine and stop the engine after 5 s or more have elapsed. Vehicle for more than 6 h 1Leave it alone. ¹ : For vehicles equipped with an external engine heater, do not operate the engine heater. Switch the ignition ON (engine off) or leave for 1 min while idling.
Courtesy of MAZDA MOTORS CORP.
1	PCM
2	Ambient temperature sensor
3	Refrigerant pressure sensor No. 1