Nissan Sentra B18 (2020-2025) Service Manual: U0073-00 Control Module Comm Bus a Off
Dtc Description
DTC Description
DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-Nissan Sentra vehicle multiplex communication line with high data communication speed and excellent error detection ability. Modern Nissan Sentra 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-High line, CAN-Low 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 items (Trouble diagnosis content) |
DTC Detection Condition |
|
|---|---|---|---|
|
U0073–00 |
Control module comm Bus A Off (Control module communication bus A Off) |
Diagnosis condition |
Ignition switch ON |
|
Signal (terminal) |
CAN communication signal |
||
|
Threshold |
Transmission error or reception error |
||
|
Diagnosis delay time |
2 second or more |
||
POSSIBLE CAUSE
CAN communication system
FAIL-SAFE
—
Dtc Confirmation Procedure
DTC Confirmation Procedure
-
DTC CONFIRMATION
-
CONSULT-
Ignition switch ON and wait for 2 seconds or more.
-
Select “Self Diagnostic Result” mode of “BCM”.
-
Is DTC 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
-
CHECK CAN COMMUNICATION
-
Check CAN communication. Refer to CAN Communication Signal Chart.
Is DTC “U0073–00” detected?
YES >>Repair or replace the malfunctioning part.
NO >>Inspection End.
-
Other materials:
Manifold Absolute Pressure Sensor
Component Inspection
Component Inspection
CHECK MANIFOLD ABSOLUTE PRESSURE
(MAP) SENSOR-1
Turn ignition switch OFF.
Start engine and warm it up to normal
operating temperature.
Turn ...
P2812-00 Pressure Control Solenoid G
Dtc Description
DTC Description
DTC DETECTION LOGIC
DTC
CONSULT screen terms
(Trouble diagnosis
content)
DTC detection
conditi ...
Heated Seat Does Not Operate. Diagnosis Procedure
Diagnosis Procedure
Diagnosis Procedure
CHECK HEATED SEAT RELAY
Check heated seat relay.
Refer to Component Function Check (LH) or Component Function Check (RH).
Is the inspection result normal?
YES>>
GO TO
...