DTC P0A9C:00, P0A9D:00, P0A9E:00, P0AC7:00 OR P0AC8:00 [Mazda M Hybrid BATTERY]

Description	P0A9C:00: Mazda M Hybrid battery (internal temperature sensor): Measured value error P0A9D:00: Mazda M Hybrid battery (temperature sensor No.1): Low input (short to ground) P0A9E:00: Mazda M Hybrid battery (temperature sensor No.1): High input (open circuit) P0AC7:00: Mazda M Hybrid battery (temperature sensor No.2): Low input (short to ground) P0AC8:00: Mazda M Hybrid battery (temperature sensor No.2): High input (open circuit)
Detection condition	Determination conditions	P0A9C:00 • The difference between the measured values of temperature sensors No.1 and No.2 in the Mazda M Hybrid battery is higher than 30 °C {54 °F}.
		P0A9D:00 • The measured value of temperature sensor No.1 in the Mazda M Hybrid battery is higher than 136 °C {277 °F}.
		P0A9E:00 • The measured value of temperature sensor No.1 in the Mazda M Hybrid battery is lower than -45 °C {-49 °F}.
		P0AC7:00 • The measured value of temperature sensor No.2 in the Mazda M Hybrid battery is higher than 136 °C {277 °F}.
		P0AC8:00 • The measured value of temperature sensor No.2 in the Mazda M Hybrid battery is lower than -45 °C {-49 °F}.
	Preconditions	• Mazda M Hybrid battery is any of the following conditions (PID: BECM_STAT) ― INITIAL ― STANDBY ― PRECHARGE ― READY • The following DTCs are not detected: P0A9C:00 ― P0A9D:00, P0A9E:00, P0AC7:00 and P0AC8:00 P0A9D:00 or P0A9E:00 ― P0A1F:09 P0AC7:00 or P0AC8:00 ― P0A1F:96
	Malfunction determination period	• 3 s period
	Drive cycle	• 1
	Self test type	• CMDTC self test, ODDTC self test
	Sensor used	• Mazda M Hybrid battery
Fail-safe function	• Inhibits the i-stop control.
Vehicle status when DTCs are output	• Inhibits the i-stop control.
Possible cause	• Mazda M Hybrid battery malfunction

• The Mazda M Hybrid battery measures the temperature of the lithium-ion battery using temperature sensors No.1 and No.2, but if the difference between the temperatures measured at temperature sensors No.1 and No.2 exceeds the specification, the Mazda M Hybrid battery determines that temperature sensor No.1 or No.2 is malfunctioning and stores a DTC.

• If a value higher than the measured upper limit value of the temperature sensor is input, the Mazda M Hybrid battery determines a short to ground in the temperature sensor and stores a DTC.

• If a value lower than the measured lower limit value of the temperature sensor is input, the Mazda M Hybrid battery determines an open circuit in the temperature sensor and stores a DTC.

1. Start the engine.

2. Perform the road test.

Note

• When an upward motion vibration is applied such as when driving over an uneven road, the Mazda M Hybrid battery could display a DTC.

• Perform the road test on an uneven road.

Step	Inspection	Results	Action
1	RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
2	VERIFY WHETHER MALFUNCTION IS PRESENT OR PAST • Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) • Is DTC P0A9C:00, P0A9D:00, P0A9E:00, P0AC7:00 or P0AC8:00 a present malfunction?	Yes	Go to the next step.
2		No	Go to Step 4.
3	VERIFY Mazda M Hybrid BATTERY DTC AGAIN • Switch the ignition off. • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) • Is DTC P0A9C:00, P0A9D:00, P0A9E:00, P0AC7:00 or P0AC8:00 a present malfunction?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the Mazda M Hybrid battery and perform the repair completion verification. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
3		No	Go to the next step.
4	INSPECT Mazda M Hybrid BATTERY FOR MALFUNCTION DEPENDING ON REPEATABILITY • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Perform the DTC inspection for the Mazda M Hybrid battery. (See DTC INSPECTION.) • Is DTC P0A9C:00, P0A9D:00, P0A9E:00, P0AC7:00 or P0AC8:00 a present malfunction?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the Mazda M Hybrid battery and perform the repair completion verification. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
4		No	The system is normal. (Explain to the customer that a DTC may be displayed when large vibration is applied in the upward/downward direction such as when driving over an uneven road.) Go to the next step.
Repair completion verification	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification		No	DTC troubleshooting completed.

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