Nissan Sentra. Manual - part 879

TM-152

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

U0073 COMMUNICATION BUS A OFF

DTC/CIRCUIT DIAGNOSIS

U0073 COMMUNICATION BUS A OFF

DTC Logic

INFOID:0000000009759382

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at

least 10 seconds, then perform the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the engine and wait for at least 5 seconds.

2. Check the DTC.
Is “U0073” detected?

YES

>> Go to 

TM-152, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009759383

For the diagnosis procedure, refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

. 

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

Possible causes

U0073

COMM BUS A OFF
(Control Module Communica-
tion Bus A Off)

TCM communication blockage lasts for 2 sec-
onds or more when turning ON the ignition 
switch. (Communication not established.)

Harness or connector
(CAN communication line is error)

U0100 LOST COMMUNICATION (ECM A)

TM-153

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

U0100 LOST COMMUNICATION (ECM A)

DTC Logic

INFOID:0000000009759384

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at

least 10 seconds, then perform the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the engine and wait for at least 5 seconds.

2. Check the DTC.
Is “U0100” detected?

YES

>> Go to 

TM-153, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009759385

For the diagnosis procedure, refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

. 

DTC

CONSULT screen terms

[Trouble diagnosis content]

DTC detection condition

Possible causes

U0100

LOST COMM (ECM A)
[Lost Communication With 
ECM/PCM A]

When the ignition switch is ON, TCM is un-
able to receive the CAN communications 
signal from ECM continuously for 2 sec-
onds or more.

• ECM
• Harness or connector

(CAN communication line is open or 
shorted)

TM-154

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

U0140 LOST COMMUNICATION (BCM)

U0140 LOST COMMUNICATION (BCM)

DTC Logic

INFOID:0000000009759386

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at

least 10 seconds, then perform the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Start the engine and wait for at least 5 seconds.

2. Check the DTC.
Is “U0140” detected?

YES

>> Go to 

TM-154, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009759387

For the diagnosis procedure, refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

. 

DTC

CONSULT screen terms

[Trouble diagnosis content]

DTC detection condition

Possible causes

U0140

LOST COMM (BCM)
[Lost Communication With 
Body Control Module]

When the ignition switch is ON, TCM is unable 
to receive the CAN communications signal 
from BCM continuously for 2 seconds or more.

• BCM
• Harness or connector

(CAN communication line is open or 
shorted)

U0141 LOST COMMUNICATION (BCM A)

TM-155

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F11A]

C

E

F

G

H

I

J

K

L

M

A

B

TM

N

O

P

U0141 LOST COMMUNICATION (BCM A)

DTC Logic

INFOID:0000000009759388

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at

least 10 seconds, then perform the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Start the engine and wait for at least 5 seconds.

2. Check the DTC.
Is “U0141” detected?

YES

>> Go to 

TM-155, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009759389

For the diagnosis procedure, refer to 

LAN-16, "Trouble Diagnosis Flow Chart"

. 

DTC

CONSULT screen terms

[Trouble diagnosis content]

DTC detection condition

Possible causes

U0141

LOST COMM (BCM A)
[Lost Communication With 
Body Control Module A]

When the ignition switch is turned ON, TCM 
continues no reception of the CAN communi-
cation signal from IPDM E/R for 2 seconds or 
more. 

• IPDM E/R
• Harness or connector

(CAN communication line is open or 
shorted)