Nissan Pathfinder: Sonar System - Dtc/circuit Diagnosis

• B2720 Corner Sensor [rl] ➤
• B2724 Sonar Control Unit
• B2738 Front Sensor Power
• B273a Ecu Configuration
• B2740 Tcu
• B2742 Ipdm E/r
• B2755 Front Sensor
• U1327 Mac Key Update
• U2025 Can Comm Err (audio Amp.)
• U2140 Mac Comm Error (ecm)
• U2a05 Comm Bus Off Its6-Fd
• Power Supply and Ground Circuit

B2720 Corner Sensor [rl] ➤ Nissan Pathfinder R53

B2724 Sonar Control Unit Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2724–04	SONAR CONTROL UNIT (Sonar control unit)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–16			Diagnosis condition	Ignition switch ON
			Signal (terminal)	Ignition power supply (terminal 12)
			Threshold	9 V or less
			Diagnosis delay time	4 seconds or more
B2724–17			Diagnosis condition	Ignition switch ON
			Signal (terminal)	Ignition power supply (terminal 12)
			Threshold	Greater than 16 V
			Diagnosis delay time	4 seconds or more
B2724–44			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–45			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–46			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–47			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–48			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–49			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Sonar control unit internal malfunction
			Diagnosis delay time	4 seconds or more
B2724–55			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Configuration is incomplete
			Diagnosis delay time	4 seconds or more

POSSIBLE CAUSE

• Harness or connectors

• Configuration

• Sonar control unit

FAIL-SAFE

Obstacle detection function is deactivated

DTC Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2724 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

DETERMINE MALFUNCTION TYPE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2724–04, 16, 17, 44, 45, 46, 47, 48, 49 or 55 detected?

YES>>

16 or 17 – GO TO 2.

YES>>

55 – GO TO 3.

YES>>

04, 44, 45, 46, 47, 48 or 49 – GO TO 4.

NO>>

Refer to Intermittent Incident.

CHECK SONAR CONTROL UNIT POWER SUPPLY CIRCUIT

Check sonar control unit power supply circuit. Refer to Diagnosis Procedure.

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Repair or replace harness or connectors.

PERFORM CONFIGURATION OF SONAR CONTROL UNIT

Perform configuration of sonar control unit. Refer to Description.

YES>>

GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2724–04, 44, 45, 46, 47, 48, 49 or 55 detected?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Inspection End.

B2738 Front Sensor Power Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2738–11	FRONT SENSOR POWER (Front sensor power)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	Front sensor power supply (terminal 11)
			Threshold	Front sensor power supply is short to ground
			Diagnosis delay time	4 seconds or more
B2738–12			Diagnosis condition	Ignition switch ON
			Signal (terminal)	Front sensor power supply (terminal 11)
			Threshold	Front sensor power supply is short to voltage
			Diagnosis delay time	4 seconds or more
B2738–87			Diagnosis condition	Ignition switch ON
			Signal (terminal)	Front sensor power supply (terminal 11)
			Threshold	Connection error is detected between sonar control unit and front sonar sensors
			Diagnosis delay time	4 seconds or more

POSSIBLE CAUSE

• Harness or connectors

• Sonar control unit

FAIL-SAFE

Obstacle detection function is deactivated

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B272C detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

DETERMINE MALFUNCTION TYPE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2738–11, 12 or 87 detected?

YES>>

11 – GO TO 2.

YES>>

12 – GO TO 3.

YES>>

87 – GO TO 4.

NO>>

Refer to Intermittent Incident.

CHECK FRONT SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND

1. Ignition switch OFF.

2. Disconnect sonar control unit and all front sonar sensor connectors.

3. Check continuity between sonar control unit connector and ground.

   Sonar control unit		Ground	Continuity
   Connector	Terminal
   M70	11	—	No

Is the inspection result normal?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Repair or replace harness or connectors.

CHECK FRONT SENSOR POWER SUPPLY FOR SHORT TO VOLTAGE

1. Ignition switch OFF.

2. Disconnect sonar control unit and all front sonar sensor connectors.

3. Ignition switch ON.

4. Check the voltage between sonar control unit connector and ground.

   Sonar control unit		—	Voltage (Approx.)
   Connector	Terminal
   M70	11	Ground	0 V

Is the inspection result normal?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Repair or replace harness or connectors.

CHECK SONAR CONTROL UNIT AND FRONT SENSOR CONNECTORS

Check the terminals and connectors of each front sonar sensor and sonar control unit for damage, bends and looseness.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace harness or connectors.

CHECK FRONT SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1. Ignition switch OFF.

2. Disconnect sonar control unit and all front sonar sensor connectors.

3. Check continuity between sonar control unit connector and front sonar sensor connectors.

   Sonar control unit		Front sonar sensors		Continuity
   Connector	Terminal	Connector	Terminal
   M70	11	E307 (front sonar sensor LH inner)	1	Yes
   		E308 (front sonar sensor RH inner)
   		E309 (front sonar sensor LH outer)
   		E310 (front sonar sensor RH outer)

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace harness or connectors.

CHECK INTERMITTENT INCIDENT

Perform intermittent incident. Refer to Intermittent Incident.

Is the inspection result normal?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Repair or replace the applicable malfunctioning components.

B273a Ecu Configuration Nissan Pathfinder

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B273A–55	ECU Configuration (ECU Configuration)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Configuration is incomplete
			Diagnosis delay time	4 seconds or more

POSSIBLE CAUSE

• Vehicle specification for sonar control unit is incomplete

• Sonar control unit

FAIL-SAFE

Obstacle detection function is deactivated

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B273A–55 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

PERFORM CONFIGURATION OF SONAR CONTROL UNIT

Perform configuration of sonar control unit. Refer to Description.

YES>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B273A–55 detected?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Inspection End.

B2740 Tcu Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2740–82	TCU (TCU)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Communication error between sonar control unit and TCU
			Diagnosis delay time	4 seconds or more
B2740–83			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Communication error between sonar control unit and TCU
			Diagnosis delay time	4 seconds or more
B2740–87			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Communication error between sonar control unit and TCU
			Diagnosis delay time	4 seconds or more

POSSIBLE CAUSE

• Sonar control unit

• TCU

FAIL-SAFE

Obstacle detection function is deactivated

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2740 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

DETERMINE MALFUNCTION TYPE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2740–82, 83 or 87 detected?

YES>>

82 or 83 – GO TO 2.

YES>>

87 – GO TO 3.

NO>>

Refer to Intermittent Incident.

CHECK SELF DIAGNOSTIC RESULT OF TCU

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “IVC”.

5. Check the DTC.

Is any DTC detected?

YES>>

Perform trouble diagnosis for detected DTC. Refer to DTC Index.

NO>>

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2740–82, 83 or 87 detected?

YES>>

82 or 83, replace sonar control unit. Refer to Removal and Installation.

YES>>

87, perform trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

NO>>

Inspection End.

B2742 Ipdm E/r Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2742–82	IPDM E/R (IPDM E/R)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Communication error between sonar control unit and IPDM E/R
			Diagnosis delay time	4 seconds or more
B2742–83			Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Communication error between sonar control unit and IPDM E/R
			Diagnosis delay time	4 seconds or more

POSSIBLE CAUSE

• Sonar control unit

• IPDM E/R

FAIL-SAFE

Obstacle detection function is deactivated

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2742–82 or 83 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

CHECK SELF DIAGNOSTIC RESULT OF IPDM E/R

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “IPDM E/R”.

5. Check the DTC.

Is any DTC detected?

YES>>

Perform trouble diagnosis for detected DTC. Refer to DTC Index.

NO>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2742–82 or 83 detected?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Inspection End.

B2755 Front Sensor Nissan Pathfinder R53

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
B2755–94	Front sensor (Front sensor)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	Front sensor signals
			Threshold	Persistent noise
			Diagnosis delay time	1 second or more

POSSIBLE CAUSE

Persistent noise in the front sensors ultrasonic range (exhaust sound, heavy rain, horn) not filtered out by signal processing

FAIL-SAFE

Obstacle detection function is deactivated

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2755–94 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

CHECK FRONT SENSORS

Check the front sensors for dirt and damage.

Is inspection result normal?

YES>>

GO TO 2.

NO>>

Clean the sonar sensors or replace if damaged. Refer to Removal and Installation.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 30 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC B2755–94 detected?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Inspection End.

U1327 Mac Key Update Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
U1327–52	MAC key update (Message Authentication Code key update)	—	Diagnosis condition	—
			Signal (terminal)	—
			Threshold	MAC key writing is incomplete
			Diagnosis delay time	—
U1327–54			Diagnosis condition	—
			Signal (terminal)	—
			Threshold	MAC key is not written after sonar control unit replacement
			Diagnosis delay time	—

POSSIBLE CAUSE

• U1327–52:

  • Network communication error between CONSULT and sonar control unit

  • Sonar control unit used in other Nissan Pathfinder vehicle is installed in the vehicle

  • Sonar control unit

• U1327–54:

  • Writing of MAC key has not been executed

  • Sonar control unit

FAIL-SAFE

—

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

NOTE:

If DTC U1327–52 is displayed with DTC U1327–54, first perform the trouble diagnosis for DTC U1327–54.

CONSULT

1. Ignition switch ON.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U1327–52 or 54 detected as the current malfunction?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

DETERMINE MALFUNCTION TYPE

NOTE:

If DTC U1327–52 is displayed with DTC U1327–54, first perform the trouble diagnosis for DTC U1327–54.

CONSULT

1. Ignition switch ON.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U1327 detected?

YES>>

54 – GO TO 2.

YES>>

52 – GO TO 4.

NO>>

Refer to Intermittent Incident.

PERFORM MAC KEY WRITING

CONSULT

1. Perform MAC key writing. Refer to Description.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U1327–54 detected as the current malfunction?

YES>>

GO TO 3.

NO>>

Inspection End.

PERFORM MAC KEY WRITING 2

CONSULT

1. Perform MAC key writing. Refer to Description.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U1327–54 detected as the current malfunction?

YES>>

GO TO 4.

NO>>

Inspection End.

PERFORM MAC KEY WRITING 3

CONSULT

1. Perform MAC key writing. Refer to Description.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U1327–52 or 54 detected as the current malfunction?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

Inspection End.

U2025 Can Comm Err (audio Amp.) Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
U2025–87	CAN comm err (audio amp.) [Control Area Network communication error (audio amp.)]	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	CAN communication signal
			Threshold	Sonar control unit cannot communicate with CAN communication signal
			Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

—

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 2 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC U2025–87 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 2 seconds or more.

4. Erase DTC.

5. Select “Self Diagnostic Result” mode of “SONAR”.

6. Check the DTC.

Is DTC U2025–87 detected?

YES>>

Perform trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

NO>>

Inspection End.

U2140 Mac Comm Error (ecm) Nissan Pathfinder 5th Gen

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
U2140–57	CAN comm err (ECM) [Control Area Network communication error (ECM)]	—	Diagnosis condition	—
			Signal (terminal)	—
			Threshold	MAC communication error
			Diagnosis delay time	—

POSSIBLE CAUSE

• MAC communication error

• Sonar control unit used in other vehicles is installed in the Nissan Pathfinder vehicle

• Sonar control unit

• ECM

FAIL-SAFE

—

Confirmation Procedure

CHECK DTC PRIORITY

If DTC U2140–57 is displayed with DTC U1327–52 or 54, first perform the trouble diagnosis for DTC U1327–52 or 54.

Is DTC U1327–52 or 54 detected?

YES>>

Refer to DTC Description.

NO>>

GO TO 2.

CHECK MAC DIAGNOSIS

CONSULT

1. Ignition switch ON.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U2140–57 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC U2140–57 is displayed with DTC U1327–52 or 54, first perform the trouble diagnosis for DTC U1327–52 or 54.

Is DTC U1327–52 or 54 detected?

YES>>

Refer to DTC Description.

NO>>

GO TO 2.

CHECK MAC DIAGNOSIS

CONSULT

1. Ignition switch ON.

2. Select “MAC Diagnosis” mode of “SONAR”.

Is DTC U2140-57 detected with DTC U2141-57, U2148-57, U214E-57, U214F-57, U2152-57, U2156-57, U2159-57, U215B-57, U2175-57 and U2176-57 at the same time?

YES>>

Replace sonar control unit. Refer to Removal and Installation.

NO>>

GO TO 3.

CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to Trouble Diagnosis Flow Chart.

>>

Inspection End.

U2a05 Comm Bus Off Its6-Fd Nissan Pathfinder

DTC Description

DESCRIPTION

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Pathfinder vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Pathfinder vehicle is equipped with many electronic control unit, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only. CAN Communication Signal Chart. Refer to CAN Communication Signal Chart.

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)		DTC detection condition
U2A05–88	Comm Bus Off ITS6–FD (Communication Bus Off Intelligent Transport System6–FD)	—	Diagnosis condition	Ignition switch ON
			Signal (terminal)	CAN communication signal
			Threshold	Sonar control unit cannot communicate with CAN communication signal
			Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

CAN communication system

FAIL-SAFE

—

Confirmation Procedure

DTC CONFIRMATION PROCEDURE

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 2 seconds or more.

4. Select “Self Diagnostic Result” mode of “SONAR”.

5. Check the DTC.

Is DTC U2A05–88 detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: Inspection End.

Diagnosis Procedure

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

CONSULT

1. Ignition switch ON.

2. Ignition switch OFF and wait at least 30 seconds.

3. Ignition switch ON and wait at least 2 seconds or more.

4. Erase DTC.

5. Select “Self Diagnostic Result” mode of “SONAR”.

6. Check the DTC.

Is DTC U2A05–88 detected?

YES>>

Perform trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

NO>>

Inspection End.

Power Supply and Ground Circuit Nissan Pathfinder

Diagnosis Procedure

CHECK FUSE

Check that the following fuse is not blown:

Terminal No.	Signal name	Fuse No.	Capacity
12	Ignition power supply	41	10 A

Is the fuse blown?

YES>>

Replace the blown fuse after repairing the affected circuit.

NO>>

GO TO 2.

CHECK POWER SUPPLY CIRCUIT

1. Ignition switch OFF.

2. Disconnect sonar control unit connector.

3. Check voltage between sonar control unit harness connector and ground.

   Sonar control unit		(–)	Condition	Voltage (Approx.)
   Connector	Terminal
   M70	12	Ground	Ignition switch: ON	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace harness or connectors.

CHECK GROUND CIRCUIT

1. Ignition switch OFF.

2. Check continuity between sonar control unit harness connector and ground.

   Sonar control unit		(–)	Continuity
   Connector	Terminal
   M70	15	Ground	Yes

Is the inspection result normal?

YES>>

Inspection End.

NO>>

Repair or replace harness or connectors.