Details On DTCs

P2504: 00 (PCM (H3T)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Drive/motor system: High input
Detection condition	Determination condition	When any of the following conditions is met. Condition A The state in which the battery voltage is equal to or higher than the specified value V is continued for a predetermined time. Condition B The state where the input voltage is higher than the specified value continues for the specified time. Condition C The state in which the voltage at the output terminal of the drive motor is equal to or higher than the specified value continues for a predetermined time. Condition D The DC-DC converter continues to exceed the specified value for a predetermined time.
	Preconditions	Shutdown relay of Mazda M Hybrid Boost battery is ON.
	Determination period	5s
	Drive cycle	1
	Self-test type	CMDTC self-test
	Sensor/unit used	PCM DC-DC converter Mazda M Hybrid Boost battery Drive motor control module
Fail-safe	Power supply by the DC-DC converter step-down circuit is stopped. Power generation by the drive motor is stopped. Turn off the shut-off relay of the Mazda M Hybrid Boost battery and supply power from the battery to the vehicle electrical equipment (12 V power source). Performs vehicle speed restriction according to low battery voltage, and activates Auto P function at a vehicle speed of 5 km/h {3 mph} or less
Vehicle status when DTCs are output	If the vehicle continues to be driven while the DTC is detected the battery will be depleted. A malfunction occurs with an electrical device and the vehicle stops. The following vehicle conditions differ depending on the malfunction conditions. A vehicle shock may occur due to generator load. Idling feel due to generator-stop may occur.
Possible cause	Poor connection of the following parts: DC-DC converter Mazda M Hybrid Boost battery Drive motor Connector or terminal malfunction of the following parts: DC-DC converter Mazda M Hybrid Boost battery Drive motor Short circuit between DC-DC converter, Mazda M Hybrid Boost battery, or drive motor charge/discharge circuit PCM malfunction