Nissan Sentra. Instruction — part 771

SEC-112

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B26F9 CRANKING REQUEST CIRCUIT

B26F9 CRANKING REQUEST CIRCUIT

DTC Logic

INFOID:0000000009756762

DTC DETECTION LOGIC

NOTE:

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

BCS-63, "DTC Logic"

.

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

BCS-64, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION

1. Perform DTC CONFIRMATION PROCEDURE for DTC P1650. Refer to

EC-399, "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-112, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000009756763

Regarding Wiring Diagram information, refer to

SEC-25, "Wiring Diagram"

.

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.

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B26F9

CRANK REQ CIR SHORT
(Cranking request circuit
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

BCM

Connector

Terminal

M85

81

Ground

Ignition switch ON

• Engine: Stopped
• Selector lever position: P

0 – 0.5 V

• Engine: Stopped
• Selector lever position:

Other than P

9 – 16 V

Engine running

9 – 16 V

B26F9 CRANKING REQUEST CIRCUIT

SEC-113

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

2. Disconnect BCM connector.

3. Disconnect ECM connector.

4. Check continuity between BCM harness connector and ECM harness connector.

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-73, "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-112, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4.

NO

>> Inspection End

4.

REPLACE ECM

Replace ECM.

Refer to

EC-485, "Removal and Installation"

.

>> Inspection End

BCM

ECM

Continuity

Connector

Terminal

Connector

Terminal

M85

81

E16

101

Yes

BCM

Ground

Continuity

Connector

Terminal

M85

81

No

SEC-114

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B26FA CRANKING REQUEST CIRCUIT

B26FA CRANKING REQUEST CIRCUIT

DTC Logic

INFOID:0000000009756764

DTC DETECTION LOGIC

NOTE:

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

BCS-63, "DTC Logic"

.

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

BCS-64, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION

1. Perform DTC CONFIRMATION PROCEDURE for DTC P1650. Refer to

EC-399, "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-114, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000009756765

Regarding Wiring Diagram information, refer to

SEC-25, "Wiring Diagram"

.

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.

DTC No.

CONSULT screen items

(Trouble diagnosis content)

DTC detecting condition

Possible cause

B26FA

CRANK REQ CIR OPEN
(Cranking request circuit
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

BCM

Connector

Terminal

M85

81

Ground

Ignition switch ON

• Engine: Stopped
• Selector lever position: P

0 – 0.5 V

• Engine: Stopped
• Selector lever position:

Other than P

9 – 16 V

Engine running

9 – 16 V

B26FA CRANKING REQUEST CIRCUIT

SEC-115

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

2. Disconnect BCM connector.

3. Disconnect ECM connector.

4. Check continuity between BCM harness connector and ECM harness connector.

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-73, "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-112, "DTC Logic"

.

Is DTC detected?

YES

>> GO TO 4.

NO

>> Inspection End

4.

REPLACE ECM

Replace ECM.

Refer to

EC-485, "Removal and Installation"

.

>> Inspection End

BCM

ECM

Continuity

Connector

Terminal

Connector

Terminal

M85

81

E16

101

Yes

BCM

Ground

Continuity

Connector

Terminal

M85

81

No