Nissan Sentra. Manual - part 773

SEC-120

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B20A0 CRANKING REQUEST CIRCUIT

B20A0 CRANKING REQUEST CIRCUIT

DTC Logic

INFOID:0000000009756772

DTC DETECTION LOGIC

NOTE:

If DTC B20A0 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

PCS-

26, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

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 IPDM E/R using CONSULT.
Is DTC detected?

YES

>> Refer to 

SEC-120, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000009756773

Regarding Wiring Diagram information, refer to 

SEC-25, "Wiring Diagram"

.

1.

CHECK CRANKING REQUEST SIGNAL

1. Turn ignition switch ON.

2. Check voltage between IPDM E/R 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 con-

tent)

DTC detecting condition

Possible cause

B20A0

STR CUT OFF SHORT
(Starter cut off short)

When the following items do not match, a 
malfunction is detected.
• 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.)

• IPDM  E/R
• ECM

(+)

(–)

Condition

Voltage

IPDM E/R

Connector

Terminal

E46

37

Ground

Ignition switch FF

0 – 1 V

Ignition switch ON

• Engine: Stopped
• Selector lever position: P

• Engine: Stopped
• Selector lever position: 

Other than P

9 – 16 V

Engine running

B20A0 CRANKING REQUEST CIRCUIT

SEC-121

< 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 IPDM E/R connector.

3. Disconnect ECM connector.

4. Check continuity between IPDM E/R 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 IPDM E/R

1. Replace IPDM E/R. Refer to 

PCS-30, "Removal and Installation"

.

2. Perform DTC CONFIRMATION PROCEDURE for DTC B20A0. Refer to 

SEC-120, "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

IPDM E/R

ECM

Continuity

Connector

Terminal

Connector

Terminal

E46

37

E16

101

Yes

IPDM E/R

Ground

Continuity

Connector

Terminal

E46

37

No

SEC-122

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B210B STARTER CONTROL RELAY

B210B STARTER CONTROL RELAY

DTC Logic

INFOID:0000000009756774

DTC DETECTION LOGIC

NOTE:

If DTC B210B is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to 

BCS-

63, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Press push-button ignition switch under the following conditions to start engine, and wait 1 second or

more.

CVT models

-

CVT selector lever is in the P (Park) position.

-

Depress the brake pedal

M/T models

-

Shift lever: in the neutral position

-

Clutch pedal: Not depressed

2. Check DTC in Self Diagnostic Result mode of IPDM E/R using CONSULT.
Is DTC detected?

YES

>> Go to 

SEC-122, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009756775

1.

INSPECTION START

Perform Self Diagnostic Result of IPDM E/R using CONSULT.
Is display history of DTC B210B CRNT?

YES

>> Replace IPDM E/R. Refer to 

PCS-30, "Removal and Installation"

.

NO

>> Refer to 

GI-39, "Intermittent Incident"

.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B210B

START CONT RLY 
ON

When comparing the following items, IPDM E/R de-
tects that starter control relay is stuck in the ON po-
sition for 1 second or more.
• Starter control relay signal (CAN) from BCM
• Starter relay status signal (CAN) from BCM
• Starter control relay and starter relay status sig-

nal (IPDM E/R input)

• Starter control relay control signal (IPDM E/R 

output)

• IPDM E/R

B210C STARTER CONTROL RELAY

SEC-123

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B210C STARTER CONTROL RELAY

DTC Logic

INFOID:0000000009756776

DTC DETECTION LOGIC

NOTE:

• If DTC B210C is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

PCS-26, "DTC Logic"

.

• When IPDM E/R power supply voltage is low (Approx. 7 - 8 V for about 1 second), the DTC B210C may be

detected.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Press push-button ignition switch under the following conditions to start engine, and wait 1 second or

more.

CVT models

-

CVT selector lever is in the P (Park) position.

-

Depress the brake pedal

M/T models

-

Shift lever: in the neutral position

-

Clutch pedal: Not depressed

2. Check DTC in Self Diagnostic Result mode of IPDM E/R using CONSULT.
Is DTC detected?

YES

>> Go to 

SEC-123, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009756777

Regarding Wiring Diagram information, refer to 

SEC-25, "Wiring Diagram"

.

1.

PERFORM SELF DIAGNOSTIC RESULT

Perform Self Diagnostic Result of IPDM E/R using CONSULT.
Is display history of DTC B210C CRNT?

YES

>> GO TO 2.

NO

>> Refer to 

GI-39, "Intermittent Incident"

.

2.

CHECK STARTER CONTROL RELAY CONTROL CIRCUITS VOLTAGE

Check voltage between IPDM E/R connectors and ground.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B210C

START CONT RLY 
OFF CIRC

When comparing the following items, IPDM E/R de-
tects that starter control relay is stuck in the OFF 
position for 1 second or more.
• Starter control relay signal (CAN) from BCM
• Starter relay status signal (CAN) from BCM
• Starter control relay and starter relay status sig-

nal (IPDM E/R input)

• Starter control relay control signal (IPDM E/R 

output)

• IPDM  E/R
• BCM
• Battery

IPDM E/R

Ground

Voltage

(Approx.)

Connector

Terminal

E46

44

—

Battery voltage