Nissan Quest E52. Manual - part 1102

SEC-98

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B26F8 BCM

B26F8 BCM

DTC Logic

INFOID:0000000009650763

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait 1 second.

2.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT.

Is DTC detected?

YES

>> Go to 

SEC-98, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650764

1.

INSPECTION START

1.

Turn ignition switch ON.

2.

Select “Self Diagnostic Result” mode of ”BCM” using CONSULT.

3.

Touch “ERASE”.

4.

Perform DTC CONFIRMATION PROCEDURE for DTC B26F8.
Refer to 

SEC-98, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

REPLACE BCM

1.

Replace BCM. Refer to 

BCS-98, "Removal and Installation"

.

2.

Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B26F8

BCM

Starter control replay control signal and feedback circuit 
signal (inside BCM) does not match.

BCM

B26F9 CRANKING REQUEST CIRCUIT

SEC-99

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B26F9 CRANKING REQUEST CIRCUIT

DTC Logic

INFOID:0000000009650765

DTC DETECTION LOGIC

NOTE:
• If DTC B26F9 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-87, "DTC Logic"

.

• If DTC B26F9 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

BCS-88, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION

1.

Perform DTC CONFIRMATION PROCEDURE for DTC P1650. Refer to 

EC-374, "DTC Logic"

.

2.

Turn ignition switch ON.

3.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT. 

Is DTC detected?

YES

>> Go to 

SEC-99, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650766

1.

CHECK CRANKING REQUEST SIGNAL

1.

Turn ignition switch ON.

2.

Check voltage between BCM harness connector and ground under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK CRANKING REQUEST SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Disconnect ECM connector.

4.

Check continuity between BCM harness connector and ECM harness connector.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B26F9

CRANK REQ CIR SHORT

BCM detects that the status of the following 
signals does not match.
• Cranking request signal from ECM
• Starter control relay control signal from 

ECM (CAN)

• Harness or connectors 

(CAN communication line is open or 
shorted.)

• Harness or connectors 

(Cranking request signal circuit is open 
or shorted.)

• ECM
• BCM

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M123

64

Ground

Ignition switch OFF

3.6

Ignition switch ON

• Engine: Stopped
• Selector lever position: P

0 - 1

• Engine: Stopped
• Selector lever position: 

Other than P

9 - 16

Engine running

9 - 16

SEC-100

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B26F9 CRANKING REQUEST CIRCUIT

5.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

REPLACE BCM

1.

Replace BCM. Refer to 

BCS-98, "Removal and Installation"

.

2.

Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

3.

Perform DTC CONFIRMATION PROCEDURE for DTC B26F9. Refer to 

SEC-99, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4.

NO

>> INSPECTION END

4.

REPLACE ECM

Replace ECM.
Refer to 

EC-460, "Removal and Installation"

.

>> INSPECTION END

BCM

ECM

Continuity

Connector

Terminal

Connector

Terminal

M123

64

F7

8

Existed

BCM

Ground

Continuity

Connector

Terminal

M123

64

Not existed

B26FA CRANKING REQUEST CIRCUIT

SEC-101

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B26FA CRANKING REQUEST CIRCUIT

DTC Logic

INFOID:0000000009650767

DTC DETECTION LOGIC

NOTE:
• If DTC B26FA is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-87, "DTC Logic"

.

• If DTC B26FA is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

BCS-88, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION

1.

Perform DTC CONFIRMATION PROCEDURE for DTC P1650. Refer to 

EC-374, "DTC Logic"

.

2.

Turn ignition switch ON.

3.

Check DTC in “Self Diagnostic Result” mode of “BCM” using CONSULT. 

Is DTC detected?

YES

>> Go to 

SEC-101, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650768

1.

CHECK CRANKING REQUEST SIGNAL

1.

Turn ignition switch ON.

2.

Check voltage between BCM harness connector and ground under the following conditions.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK CRANKING REQUEST SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connector.

3.

Disconnect ECM connector.

4.

Check continuity between BCM harness connector and ECM harness connector.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B26FA

CRANK REQ CIR OPEN

BCM detects that the status of the following 
signals does not match.
• Cranking request signal from ECM
• Starter control relay control signal from 

ECM (CAN)

• Harness or connectors 

(CAN communication line is open or 
shorted.)

• Harness or connectors 

(Cranking request signal circuit is open 
or shorted.)

• BCM
• ECM

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M123

64

Ground

Ignition switch OFF

3.6

Ignition switch ON

• Engine: Stopped
• Selector lever position: P

0 - 1

• Engine: Stopped
• Selector lever position: 

Other than P

9 - 16

Engine running

9 - 16