Nissan Ariya: Dcdc (dc/dc Converter)

• P1aa5-A2 Control Unit Supply Voltage
• P1aa6-9e Input Voltage Sensor/ecu Switch
• P1aad-48 High Voltage Current Sensor Error
• P1aae-4b Temperature Sensor/system Error 1
• P1aba-17 Low Voltage Value
• P1abc-16 High Voltage Input Voltage

P1aa5-A2 Control Unit Supply Voltage Nissan Ariya 2025

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms	DTC detecting condition
P1AA5	A2	Control unit supply voltage	Diagnosis condition	READY, AUTO ACC or power switch ON
			Signal	DC/DC converter internal voltage
			Threshold	DC/DC converter internal voltage is less than 6.1 V
			Detection time	1 second

POSSIBLE CAUSE

• 12 V battery

• Harness and connector

• DC/DC converter

FAIL-SAFE

Not applicable

Confirmation Procedure

PRECONDITIONING

• Press the power switch OFF with the driver's side door open, get out of the Nissan Ariya vehicle, close the driver's side door and wait for at least 4 minutes.

  CAUTION:

  Since the auto ACC function causes the accessory power to be turned ON, do not perform any Nissan Ariya vehicle operation including locking the doors or opening and closing of the doors while waiting.

• Check that 12 V battery voltage is 11 V or more.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Erase “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

2. Set the Nissan Ariya vehicle to READY and wait at least 1 second.

3. Check “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK 12V BATTERY

Check 12V battery. Refer to Work Flow.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace 12V battery. Refer to 12V BATTERY : Removal & Installation.

CHECK DC/DC CONVERTER CAN COMMUNICATION LINE

Check DC/DC converter CAN communication line installation condition visually and tactually.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace error-detected parts.

PERFORM SELF-DIAGNOSIS OF VCM

With CONSULT

1. Power switch ON.

2. Check “self-diagnostic result” in “EV/HEV” using CONSULT.

Is DTC detected?

YES>>

Perform the trouble diagnosis for the detected DTC.

NO>>

GO TO 4.

CHECK DC/DC CONVERTER OUTPUT VOLTAGE

Check voltage between 12V battery plus terminal and ground.

＋		-	Voltage
12V battery
12V battery plus terminal		Ground	Approximately 13 - 15.5 V

Is the inspection result normal

YES>>

Replace DC/DC converter. Refer to DC/DC CONVERTER : Disassembly & Assembly.

NO>>

GO TO 5.

CHECK DC/DC CONVERTER 12V BATTERY VOLTAGE

＋		−	Voltage
DC/DC converter
Connector	Terminal
H4	7	Ground	12V battery voltage

YES>>

GO TO 6.

NO>>

GO TO 7.

CHECK DC/DC CONVERTER GROUND CIRCUIT

Check for continuation between the metal parts of the DC/DC converter and ground.

Is there continuation?

YES>>

Perform trouble cause simulation test. Refer to Intermittent Incident.

NO>>

Repair or replace error-detected parts.

CHECK FUSIBLE LINK

Check that the fusible link below is not blown.

Fusible link number	Capacity
A	450 A

Is the fusible link blown?

YES>>

Replace the fusible link after repairing the applicable circuit.

NO>>

GO TO 8.

CHECK 12V BATTERY CIRCUIT

1. Disconnect battery terminal integrated fusible link harness connector.

2. Disconnect DC/DC converter harness connector.

3. Check for continuation between battery terminal integrated fusible link and DC/DC converter.

   Battery terminal integrated fusible link		DC/DC converter		Continuity
   Connector	Terminal	Connector	Terminal
   H3	9	H4	7	Existing

4. Also check harness for short to ground.

Is the inspection result normal?

YES>>

Check 12V battery power supply circuit.

NO>>

Repair or replace error-detected parts.

P1aa6-9e Input Voltage Sensor/ecu Switch Nissan Ariya: FE0

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms	DTC detecting condition
P1AA6	9E	Input voltage sensor/ECU switch	Diagnosis condition	READY, AUTO ACC or power switch ON
			Signal	—
			Threshold	DC/DC converter cannot be shut off. Alternatively the shut off time is too long.
			Detection time	—

POSSIBLE CAUSE

DC/DC converter

FAIL-SAFE

Not applicable

Confirmation Procedure

PRECONDITIONING

• Press the power switch OFF with the driver's side door open, get out of the Nissan Ariya vehicle, close the driver's side door and wait for at least 4 minutes.

  CAUTION:

  Since the auto ACC function causes the accessory power to be turned ON, do not perform any Nissan Ariya vehicle operation including locking the doors or opening and closing of the doors while waiting.

• Check that 12 V battery voltage is 11 V or more.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Erase “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

2. Set the Nissan Ariya vehicle to READY.

3. Check “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

With CONSULT

Perform DTC confirmation procedure again. Refer to Confirmation Procedure.

Is DTC P1AA6-9E detected again?

YES>>

Replace DC/DC converter. Refer to DC/DC CONVERTER : Disassembly & Assembly.

NO>>

INSPECTION END

P1aad-48 High Voltage Current Sensor Error Nissan Ariya 2023

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms	DTC detecting condition
P1AAD	48	High voltage current sensor error	Diagnosis condition	READY, AUTO ACC or power switch ON
			Signal	—
			Threshold	An error in the DC/DC converter internal system is detected.
			Detection time	1 second

POSSIBLE CAUSE

DC/DC converter

FAIL-SAFE

DC/DC converter output is stopped

Confirmation Procedure

PRECONDITIONING

• Press the power switch OFF with the driver's side door open, get out of the Nissan Ariya vehicle, close the driver's side door and wait for at least 4 minutes.

  CAUTION:

  Since the auto ACC function causes the accessory power to be turned ON, do not perform any Nissan Ariya vehicle operation including locking the doors or opening and closing of the doors while waiting.

• Check that 12 V battery voltage is 11 V or more.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Erase “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

2. Set the Nissan Ariya vehicle to READY and wait at least 1 second.

3. Check “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

PERFORM SELF-DIAGNOSIS OF VCM

With CONSULT

1. Power switch ON.

2. Check “self-diagnostic result” result in “EV/HEV” using CONSULT.

Is DTC detected?

YES>>

Perform the trouble diagnosis for the detected DTC.

NO>>

GO TO 2.

PERFORM SELF-DIAGNOSIS OF HV BATTERY

With CONSULT

Check “self-diagnostic result” result in “HIGH VOLTAGE BATTERY” and “HIGH VOLTAGE BATTERY 2” using CONSULT.

Is DTC detected?

YES>>

Perform the trouble diagnosis for the detected DTC.

NO>>

GO TO 3.

PERFORM SELF-DIAGNOSIS OF INVERTER

With CONSULT

Check “self-diagnostic result” result in “MOTOR CONTROL” using CONSULT.

Is DTC detected?

YES>>

Perform the trouble diagnosis for the detected DTC.

NO>>

GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

With CONSULT

Perform DTC confirmation procedure again. Refer to Confirmation Procedure.

Is DTC P1AAD-48 detected again?

YES>>

Replace DC/DC converter.Refer to DC/DC CONVERTER : Disassembly & Assembly.

NO>>

INSPECTION END

P1aae-4b Temperature Sensor/system Error 1 Nissan Ariya first Gen

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms	DTC detecting condition
P1AAE	4B	Temperature sensor/System error 1	Diagnosis condition	READY, AUTO ACC or power switch ON
			Signal	—
			Threshold	An overheating error of the DC/DC converter is detected.
			Detection time	1 second

POSSIBLE CAUSE

• DC/DC converter coolant circuit

• DC/DC converter

FAIL-SAFE

DC/DC converter output current is stopped

Confirmation Procedure

PRECONDITIONING

• Move the vehicle to a cool place, press the power switch OFF with the driver's side door open, get out of the Nissan Ariya vehicle and after that close the driver's side door and wait for at least 10 minutes.

  CAUTION:

  Since the auto ACC function causes the accessory power to be turned ON, do not perform any Nissan Ariya vehicle operation including locking the doors or opening and closing of the doors while waiting.

• Check that 12 V battery voltage is 11 V or more.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Erase “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

2. Set the Nissan Ariya vehicle to READY and wait at least 1 second.

3. Check “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK DTC RELATED TO HIGH VOLTAGE COOLANT SYSTEM

Check “self-diagnostic result” result in “EV/HEV” using CONSULT.

Is DTC detected?

YES>>

Inspect items of detected DTC. Refer to DTC Index.

NO>>

GO TO 2.

HIGH VOLTAGE COOLANT SYSTEM INSPECTION

Inspect high voltage coolant system for coolant amount and leakage. Refer to COOLANT : Inspection.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace error-detected parts.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

With CONSULT

Perform DTC confirmation procedure again. Refer to Confirmation Procedure.

Is DTC P1AAE-4B detected again?

YES>>

Replace DC/DC converter. Refer to DC/DC CONVERTER : Disassembly & Assembly.

NO>>

INSPECTION END

P1aba-17 Low Voltage Value Nissan Ariya 1st generation

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms	DTC detecting condition
P1ABA	17	Low voltage value	Diagnosis condition	READY, AUTO ACC or power switch ON
			Signal	—
			Threshold	When it is detected that more than 15.7 V is applied to the low voltage side of the DC/DC converter
			Detection time	1 second

POSSIBLE CAUSE

• 12 V battery

• Other electrical components

FAIL-SAFE

DC/DC converter output is stopped

Confirmation Procedure

PRECONDITIONING

• Press the power switch OFF with the driver's side door open, get out of the Nissan Ariya vehicle, close the driver's side door and wait for at least 4 minutes.

  CAUTION:

  Since the auto ACC function causes the accessory power to be turned ON, do not perform any Nissan Ariya vehicle operation including locking the doors or opening and closing of the doors while waiting.

• Check that 12 V battery voltage is 11 V or more.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Erase “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

2. Set the Nissan Ariya vehicle to READY and wait at least 1 second.

3. Check “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK 12V BATTERY

Check 12V battery. Refer to Work Flow.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace 12V battery. Refer to 12V BATTERY : Removal & Installation.

PERFORM FULL SELF-DIAGNOSIS

With CONSULT

1. Power switch ON.

2. Check if a power supply circuit DTC is detected at another control unit using CONSULT.

Is DTC detected?

YES>>

Check the detected DTC.

NO>>

Check 12V battery power supply circuit.

P1abc-16 High Voltage Input Voltage Nissan Ariya SUV

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms	DTC detecting condition
P1ABC	16	High voltage input voltage	Diagnosis condition	READY, AUTO ACC or power switch ON
			Signal	—
			Threshold	The input voltage to the DC/DC converter is below 215 V
			Detection time	1 second

POSSIBLE CAUSE

• ECU related to EV system

• High voltage harness

• DC/DC converter

FAIL-SAFE

DC/DC converter output is stopped

Confirmation Procedure

PRECONDITIONING

• Press the power switch OFF with the driver's side door open, get out of the Nissan Ariya vehicle, close the driver's side door and wait for at least 4 minutes.

  CAUTION:

  Since the auto ACC function causes the accessory power to be turned ON, do not perform any Nissan Ariya vehicle operation including locking the doors or opening and closing of the doors while waiting.

• Check that 12 V battery voltage is 11 V or more.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Erase “self-diagnostic result” in “DC/DC CONVERTER” using CONSULT.

2. Set the Nissan Ariya vehicle to READY.

3. Check the displayed “INPUT VOLTAGE” in the “DATA MONITOR” of “DC/DC CONVERTER” using CONSULT.

Is it below 215 V?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

WARNING:

Hybrid vehicles and electric vehicles equipped with high voltage batteries may cause an electric shock or a short circuit if handled in an inappropriate way. When you inspect and service a Nissan Ariya vehicle, follow the work procedure and perform the correct tasks.

WARNING:

• When you inspect and service the high voltage wiring harnesses and components, make sure to remove the service plug in order to shut off the high voltage circuit.

• When you have removed the service plug, be sure to carry it in your pocket, or store it in the tool box in order to keep someone from accidentally connecting it during work.

• When performing high voltage system operation, be sure to wear insulating protective equipment.

• During tasks involving high voltage systems, clarify a person in charge of the tasks and do not let others touch the Nissan Ariya vehicle. When the vehicle is not being serviced, use protective items such as an electric-proof cover sheet for covering the high voltage components so as to keep someone from accidentally touching the Nissan Ariya vehicle.

• Refer to HIGH VOLTAGE PRECAUTIONS : Precautions.

CAUTION:

Setting the vehicle to the READY state with the service plug removed may cause malfunctioning. Avoid setting the Nissan Ariya vehicle to the READY state unless otherwise specified in the service manual.

CHECK DTC RELATED TO HIGH VOLTAGE SYSTEM

With CONSULT

1. Set the Nissan Ariya vehicle to READY and wait for at least 120 seconds.

2. Check DTC related to high voltage system using CONSULT.

Is DTC related to high voltage system detected?

YES>>

Check the detected DTC.

NO>>

GO TO 2.

PRECONDITIONING

WARNING:

Make sure to perform the procedure below before starting the work.

1. Disconnect the high voltage circuit. Refer to HOW TO DISCONNECT HIGH VOLTAGE : Precautions.

2. Check the voltage in the high voltage circuit. Refer to CHECK VOLTAGE IN HIGH VOLTAGE CIRCUIT : Precautions.

>>

GO TO 3.

CHECK HIGH VOLTAGE HARNESS-1

1. Disconnect the high voltage junction box high voltage harness connector.

2. Disconnect the inverter (front) high voltage harness connector.

3. Check for continuation of the high voltage harness between the high voltage junction box side connector and the inverter (front) side connector.

   High voltage junction box		Inverter (front)		Continuity
   Connector	Terminal	Connector	Terminal
   H10	N	H12	N	Existing
   	P		P

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts.

CHECK HIGH VOLTAGE HARNESS-2

1. Disconnect the Li-ion battery high voltage harness connector.

2. Check for continuation of the high voltage harness between the inverter (front) side connector and the Li-ion battery side connector.

   Inverter (front)		Li-ion battery		Continuity
   Connector	Terminal	Connector	Terminal
   H6	N	H5	37	Existing
   	P		38

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace error-detected parts.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

With CONSULT

Perform DTC confirmation procedure again. Refer to Confirmation Procedure.

Is DTC P1ABC-16 detected again?

YES>>

Replace DC/DC converter. Refer to DC/DC CONVERTER : Disassembly & Assembly.

NO>>

INSPECTION END