DTC P0AE3:00 [Mazda M Hybrid BATTERY]

Description	Mazda M Hybrid battery internal pre-charge FET: Stuck open
Detection condition	Determination conditions	• The pre-charge operation conditions are not met for a continuous 0.13 s even though the PCM commands the pre-charge operation.
	Preconditions	• Mazda M Hybrid battery is any of the following conditions (PID: BECM_STAT) ― STANDBY • The following DTCs are not detected: ― P0A1F:09, P0B3C:00, P0B3D:11, P0B3D:13 and P0B3E:00 • Mazda M Hybrid battery internal contactor control condition: OFF • Mazda M Hybrid battery pre-charge control condition: ON
	Malfunction determination period	• 0.13 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	• DTCs are stored in the dash-electrical supply unit (with seat warmer system) • Integrated starter generator (ISG) malfunction ― Integrated starter generator (ISG) is stuck open (Excessive power generation) • DC-DC converter (Mazda M Hybrid) malfunction ― DC-DC converter (Mazda M Hybrid) internal malfunction • Short to ground in Mazda M Hybrid battery charge/discharge circuit • Mazda M Hybrid battery malfunction ― Mazda M Hybrid battery internal malfunction

• If the electrical potential difference of the pre-charge FET is high for a continuous 0.13 s even though the PCM commands the pre-charge FET in the Mazda M Hybrid battery to on, the Mazda M Hybrid battery determines a malfunction and stores a DTC.

1. Switch the ignition off and wait for 35 s or more.

2. Switch the ignition ON (engine off or on) and wait for 10 s or more.

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 DC-DC CONVERTER (Mazda M Hybrid) DTC • Perform the DTC inspection for the DC-DC converter (Mazda M Hybrid). (See DTC INSPECTION.) • Is DTC U3000:49 displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC U3000:49 [DC-DC CONVERTER (Mazda M Hybrid)].)
2		No	Without seat warmer system: • Go to Step 4. With seat warmer system: • Go to the next step.
3	INSPECT FOR OTHER RELATED DTCs • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Are any seat warmer system related DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (E)].)
3		No	Go to the next step.
4	INSPECT Mazda M Hybrid BATTERY CHARGE/DISCHARGE CIRCUIT FOR SHORT TO GROUND • Verify that the integrated starter generator (ISG) connector is connected. • Inspect for continuity between integrated starter generator (ISG) terminal 2A (wiring harness-side) and body ground. • Is there continuity?	Yes	Go to the next step.
4		No	Go to Step 10.
5	INSPECT INTEGRATED STARTER GENERATOR (ISG) INTERNAL CIRCUIT FOR SHORT TO GROUND • Disconnect the integrated starter generator (ISG) connector. • Inspect for continuity between integrated starter generator (ISG) terminal 2A (part-side) and body ground. • Is there continuity?	Yes	Replace the integrated starter generator (ISG) and perform the repair completion verification 1. (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-G (E)].) (See INTEGRATED STARTER GENERATOR (ISG) REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
5		No	Without seat warmer system: • Go to Step 8. With seat warmer system: • Go to the next step.
6	INSPECT F14 20 A FUSE • Remove the F14 20 A fuse. • Inspect the F14 20 A fuse. • Is the fuse normal?	Yes	Reinstall the fuse, then go to the next step.
6		No	Repair or replace the wiring harness which has a short to ground. Replace the F14 20 A fuse and perform the repair completion verification 1.
7	INSPECT 30 A FUSE INSTALLED TO DC-DC CONVERTER (Mazda M Hybrid) • Inspect the 30 A fuse installed to the DC-DC converter (Mazda M Hybrid). (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.) • Is the fuse normal?	Yes	Reinstall the fuse, then go to the next step.
7		No	Repair or replace the wiring harness which has a short to ground. Replace the 30 A fuse and perform the repair completion verification 1.
8	INSPECT DC-DC CONVERTER (Mazda M Hybrid) INTERNAL CIRCUIT FOR SHORT TO GROUND • Disconnect the DC-DC converter (Mazda M Hybrid) connector. • Inspect for continuity between DC-DC converter (Mazda M Hybrid) terminal 2A (part-side) and body ground. • Is there continuity?	Yes	Replace the DC-DC converter (Mazda M Hybrid) and perform the repair completion verification 2. (See DC-DC CONVERTER (Mazda M Hybrid) REMOVAL/INSTALLATION.)
8		No	Go to the next step.
9	INSPECT Mazda M Hybrid BATTERY CHARGE/DISCHARGE CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to repair completion verification 1.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
10	INSPECT Mazda M Hybrid BATTERY FOR MALFUNCTION DEPENDING ON REPEATABILITY • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the ignition off and wait for 35 s or more. • 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 P0AE3:00 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 2. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
10		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 repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Switch the ignition off and wait for 35 s or more. • 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 the same Pending DTC present?	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, then go to the next step. (See Mazda M Hybrid BATTERY REMOVAL/INSTALLATION.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	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 2		No	DTC troubleshooting completed.

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