Nissan Sentra B18 (2020-2025) Service Manual: B2721 Center Sensor [rl]
Dtc Description
DTC Description
DTC DETECTION LOGIC
|
DTC No. |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
||
|---|---|---|---|---|
|
B2721–60 |
CENTER SENSOR [RL] (Rear sonar sensor LH inner) |
— |
Diagnosis condition |
When ignition switch is ON |
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (reset error) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–61 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (configuration error) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–62 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (power supply error) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–63 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (self diag result) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–65 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (over temperature) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–66 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
Rear inner left sensor signal (terminal 21) |
|||
|
Threshold |
Rear inner left sensor signal circuit is open or short to ground |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–67 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (diag dump error) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–68 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (resonator error) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–83 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (CRC error) |
|||
|
Diagnosis delay time |
— |
|||
|
B2721–92 |
Diagnosis condition |
When ignition switch is ON |
||
|
Signal (terminal) |
— |
|||
|
Threshold |
Rear sonar sensor LH inner internal failure (membrane error) |
|||
|
Diagnosis delay time |
— |
|||
POSSIBLE CAUSE
-
Harness or connectors
-
Rear sonar sensor LH inner
FAIL-SAFE
-
Obstacle detection of rear sonar sensor LH inner is stopped
-
Audible warning (sonar buzzer) of all sensors is stopped
-
Sonar buzzer sounds for 3 seconds
Dtc Confirmation Procedure
DTC Confirmation Procedure
-
DTC CONFIRMATION PROCEDURE
-
CONSULT-
Ignition switch ON.
-
Ignition switch OFF and wait at least 30 seconds.
-
Ignition switch ON and wait at least 2 seconds or more.
-
Select “Self Diagnostic Result” mode of “SONAR”.
-
Is DTC B2721 detected?
YES>>Refer to DTC Diagnosis Procedure.
NO>>To check malfunction symptom before repair: Refer to Intermittent Incident.
NO>>Confirmation after repair: Inspection End.
-
Dtc Diagnosis Procedure
DTC Diagnosis Procedure
-
DETERMINE MALFUNCTION TYPE
-
CONSULT-
Ignition switch ON.
-
Select “Self Diagnostic Result” mode of “SONAR”.
-
Check DTC.
-
Is DTC B2721–60, 61, 62, 63, 65, 66, 67, 68, 83 or 92 detected?
YES >>66 – GO TO 2.
YES >>60, 61, 62, 63, 65, 67, 68, 83 or 92 – GO TO 5.
NO >>Refer to Intermittent Incident.
-
-
CHECK REAR SONAR SENSOR LH INNER SIGNAL CIRCUIT FOR OPEN OR SHORT TO GROUND
-
-
Ignition switch OFF.
-
Disconnect sonar control unit and rear sonar sensor LH inner connectors.
-
Check continuity between sonar control unit connector and rear sonar sensor LH inner connector.
Sonar control unit
Rear sonar sensor LH inner
Continuity
Connector
Terminal
Connector
Terminal
B87
21
B403
2
Yes
-
Check continuity between sonar control unit connector and ground.
Sonar control unit
—
Continuity
Connector
Terminal
B87
21
Ground
No
-
Is the inspection result normal?
YES >>GO TO 3.
NO >>Repair or replace harness or connectors.
-
-
CHECK REAR SONAR SENSOR LH INNER GROUND CIRCUIT FOR OPEN
-
-
Ignition switch OFF.
-
Check continuity between sonar control unit connector and rear sonar sensor LH inner connector.
Sonar control unit
Rear sonar sensor LH inner
Continuity
Connector
Terminal
Connector
Terminal
B87
14
B403
1
Yes
-
Is the inspection result normal?
YES >>GO TO 4.
NO >>Repair or replace harness or connectors.
-
-
CHECK REAR SONAR SENSOR LH INNER SIGNAL
-
-
Connect sonar control unit and rear sonar sensor LH inner connectors.
-
Ignition switch ON.
-
Check signal between the terminals of sonar control unit connector.
Sonar control unit
Condition
Reference value
Connector
(+)
(–)
Terminal
Terminal
B87
21
14
Sensor signal input

-
Is the inspection result normal?
YES >>Replace sonar control unit. Refer to Removal and Installation.
NO >>Replace rear sonar sensor LH inner. Refer to Removal and Installation.
-
-
PERFORM DTC CONFIRMATION PROCEDURE AGAIN
-
CONSULT-
Ignition switch ON.
-
Erase DTC.
-
Select “Self Diagnostic Result” mode of “SONAR”.
-
Check DTC.
-
Is DTC B2721–60, 61, 62, 63, 65, 67, 68, 83, or 92 detected?
YES >>Replace rear sonar sensor LH inner. Refer to Removal and Installation.
NO >>Inspection End.
-
Other materials:
Park/neutral Position Switch
Component Inspection
Component Inspection
CHECK PARK/NEUTRAL POSITION
SWITCH-1
Turn ignition switch ON.
Check the voltage between ECM harness
connector and ground.
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CHECK HARNESS CONNECTOR
Ignition switch OFF.
Check the mating condition of TCM
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