Page 849 of 4801
DIAGNOSIS AND REPAIR WORKFLOWDLK-81
< BASIC INSPECTION >
C
D E
F
G H
I
J
L
M A
B
DLK
N
O P
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000009461803
OVERALL SEQUENCE
DETAILED FLOW
JMKIA2270GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 850 of 4801

DLK-82
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
1.GET INFORMATION FOR SYMPTOM
Get the detailed information from the customer about the symptom (the condition and the environment when
the incident/malfunction occurred).
>> GO TO 2
2.CHECK DTC
1. Check DTC.
2. Perform the following procedure if DTC is displayed.
- Record DTC and freeze frame data (P rint them out with CONSULT.)
- Erase DTC.
- Study the relationship between the cause detected by DTC and the symptom described by the customer.
3. Check related service bulletins for information.
Is any symptom described and any DTC detected?
Symptom is described, DTC is displayed>>GO TO 3
Symptom is described, DTC is not displayed>>GO TO 4
Symptom is not described, DTC is displayed>>GO TO 5
3.CONFIRM THE SYMPTOM
Confirm the symptom described by the customer.
Connect CONSULT to the vehicle in “DATA MONITO R” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 5
4.CONFIRM THE SYMPTOM
Confirm the symptom described by the customer.
Connect CONSULT to the vehicle in “DATA MONITOR ” mode and check real time diagnosis results.
Verify relation between the symptom and the condition when the symptom is detected.
>> GO TO 6
5.PERFORM DTC CONFIRMATION PROCEDURE
Perform DTC Confirmation Procedure for the display ed DTC, and then check that DTC is detected again.
At this time, always connect CONSULT to the vehicle, and check diagnostic results in real time.
If two or more DTCs are detected, refer to BCS-50, "DTC Inspection Priority Chart"
and determine trouble
diagnosis order.
NOTE:
• Freeze frame data is useful if the DTC is not detected.
• Perform Component Function Check if DTC Confirmati on Procedure is not included in Service Manual. This
simplified check procedure is an effective alternat ive though DTC cannot be detected during this check.
If the result of Component Function Check is NG, it is the same as the detection of DTC by DTC Confirma-
tion Procedure.
Is DTC detected?
Ye s > > G O T O 7
No >> Refer to GI-43, "Intermittent Incident"
.
6.DETECT MALFUNCTIONING SYST EM BY SYMPTOM TABLE
Detect malfunctioning system according to SYMPTO M TABLE based on the confirmed symptom in step 4,
and determine the trouble diagnosis order based on possible causes and symptom.
>> GO TO 7
7.DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE
Inspect according to Diagnostic Procedure of the system.
NOTE:
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 851 of 4801

DIAGNOSIS AND REPAIR WORKFLOWDLK-83
< BASIC INSPECTION >
C
D E
F
G H
I
J
L
M A
B
DLK
N
O P
The Diagnostic Procedure described based on open circuit in spection. A short circuit inspection is also
required for the circuit check in the Diagnostic Procedure.
Is malfunctioning part detected?
YES >> GO TO 8
NO >> Check voltage of related BCM terminals using CONSULT.
8.REPAIR OR REPLACE THE MALFUNCTIONING PART
1. Repair or replace the malfunctioning part.
2. Reconnect parts or connectors disconnected during Diagnostic Procedure again after repair and replace-
ment.
3. Check DTC. If DTC is displayed, erase it.
>> GO TO 9
9.FINAL CHECK
When DTC was detected in step 2, perform DTC C onfirmation Procedure or Component Function Check
again, and then check that the malfunction have been repaired securely.
When symptom was described from the customer, refer to confirmed symptom in step 3 or 4, and check that
the symptom is not detected.
Is the inspection result normal?
NO (DTC is detected)>>GO TO 7
NO (Symptom remains)>>GO TO 6
YES >> Inspection End.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 852 of 4801
DLK-84
< BASIC INSPECTION >
INSPECTION AND ADJUSTMENT
INSPECTION AND ADJUSTMENT
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT
ADDITIONAL SERVICE WHEN REPL ACING CONTROL UNIT : Description
INFOID:0000000009461804
Perform the system initialization when replacing BCM, replacing Intelligent Key or registering an additional
Intelligent Key.
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : Special Repair Re-
quirement
INFOID:0000000009461805
Refer to the CONSULT Immobilizer mode and follow the on-screen instructions.
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 853 of 4801

U1000 CAN COMM CIRCUITDLK-85
< DTC/CIRCUIT DIAGNOSIS >
C
D E
F
G H
I
J
L
M A
B
DLK
N
O P
DTC/CIRCUIT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000009461806
CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communicati on speed and excellent error detection ability. Modern
vehicles are equipped with many electronic control uni ts, and each control unit shares information and links
with other control units during operation (not independent ). In CAN communication, control units are con-
nected with 2 communication lines (CAN H-line, CAN L-li ne) allowing a high rate of information transmission
with less wiring. Each control unit transmits/recei ves data but selectively reads required data only.
CAN Communication Signal Chart. Refer to LAN-32, "CAN COMMUNICATION SYSTEM : CAN Communica-
tion Signal Chart".
DTC LogicINFOID:0000000009461807
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000009461808
1.PERFORM SELF DIAGNOSTIC
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self Diagnostic Result”.
Is
“CAN COMM CIRCUIT” displayed?
YES >> Refer to LAN-62, "Diagnosis Procedure".
NO >> Refer to GI-43, "Intermittent Incident"
.
DTCCONSULT display de-
scription DTC Detection Condit
ion Possible cause
U1000 CAN COMM CIRCUIT When BCM cannot communicate CAN com-
munication signal continuously for 2 sec-
onds or more. In CAN communication system, any item (or items)
of the following listed below is malfunctioning.
•Transmission
• Receiving (ECM)
• Receiving (VDC/TCS/ABS)
• Receiving (METER/M&A)
• Receiving (TCM)
• Receiving (MULTI AV)
• Receiving (IPDM E/R)
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 854 of 4801
DLK-86
< DTC/CIRCUIT DIAGNOSIS >
U1010 CONTROL UNIT (CAN)
U1010 CONTROL UNIT (CAN)
DTC LogicINFOID:0000000009461809
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000009461810
1.REPLACE BCM
When DTC [U1010] is detected, replace BCM.
>> Replace BCM. Refer to BCS-80, "Removal and Installation"
.
Special Repair RequirementINFOID:0000000009461811
1.REQUIRED WORK WHEN REPLACING BCM
Initialize NVIS by CONSULT. For the details of in itialization refer to CONSULT Immobilizer mode and follow
the on-screen instructions.
>> Work End.
DTC CONSULT display de-
scription DTC Detection Condit
ion Possible cause
U1010 CONTROL UNIT (CAN) BCM detected internal CAN communication circuit malfunction. BCM
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 855 of 4801

B261B REMOTE ENGINE STARTDLK-87
< DTC/CIRCUIT DIAGNOSIS >
C
D E
F
G H
I
J
L
M A
B
DLK
N
O P
B261B REMOTE ENGINE START
DTC LogicINFOID:0000000009461812
DTC DETECTION LOGIC
NOTE:
• If DTC B261B is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to
BCS-68, "DTC Logic"
.
• If DTC B261B is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
BCS-69, "DTC Logic"
.
Diagnosis ProcedureINFOID:0000000009461813
1. CHECK ECM IGNITION, POWER AND GROUND CIRCUITS
Check ECM ignition power and ground circuits. Refer to EC-203, "Diagnosis Procedure"
(with QR25DE) or
EC-709, "Diagnosis Procedure"
(with VQ35DE) .
Is the inspection result normal?
YES >> Replace ECM. Refer to EC-540, "Removal and Installation" (with QR25DE) or EC-997, "Removal
and Installation" (with VQ35DE). GO TO 2.
NO >> Repair or replace harness or connectors.
2. INSPECTION
1. Turn ignition switch ON.
2. Select "Self-diagnostic result" mode with CONSULT.
3. Touch "ERASE".
4. Perform vehicle remote start operation.
Does DTC B261B return?
YES >> Replace BCM. Refer to BCS-80, "Removal and Installation".
NO >> Inspection End.
DTC No. Trouble diagnosis
name DTC detecting condition Possible cause
B261B BCM The BCM has requested ignition OFF but ECM
keeps the engine running for more than 10 seconds
after the OFF request was made. •ECM
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM
Page 856 of 4801

DLK-88
< DTC/CIRCUIT DIAGNOSIS >
B2621 INSIDE ANTENNA
B2621 INSIDE ANTENNA
DTC LogicINFOID:0000000009461814
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Select “INTELLIGENT KEY” of “BCM” using CONSULT.
2. Select “INSIDE ANT DIAGNOSI S” in “WORK SUPPORT” mode.
3. Perform inside key antenna (“INSIDE ANT DIAG NOSIS”) on “WORK SUPPORT” of “INTELLIGENT
KEY”.
4. Check BCM for DTC.
Is inside key antenna DTC detected?
YES >> Refer to DLK-88, "Diagnosis Procedure".
NO >> Inside key antenna (rear parcel shelf) is OK.
Diagnosis ProcedureINFOID:0000000009461815
Regarding Wiring Diagram information, refer to DLK-61, "Wiring Diagram".
1.CHECK INSIDE KEY ANTENNA INPUT SIGNAL 1
1. Turn ignition switch OFF.
2. Check signal between BCM harness connector and ground using oscilloscope.
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-80, "Removal and Installation".
DTCCONSULT display
description DTC detecting condition Possible cause
B2621 INSIDE ANTENNA An excessive high or low voltage from inside anten-
na (rear parcel shelf) is sent to BCM. • Inside key antenna (rear parcel
shelf)
• Harness or connector [Inside key antenna (rear parcel
shelf) circuit is open or shorted]
(+)
(–) Condition Signal
(Reference value)
BCM
Connector Terminal
M19 100, 99 Ground When Intelligent Key is in the an-
tenna detection area
When Intelligent Key is not in the
antenna detection area
JMKIA3839GB
JMKIA5951GB
Revision: November 20132014 Altima NAMRevision: November 20132014 Altima NAM