Nissan Altima HL32 Hybrid. Manual - part 996

B2603 SHIFT POSITION STATUS

SEC-57

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B2603 SHIFT POSITION STATUS

Description

INFOID:0000000004216023

BCM confirms the shift position with the following 3 signals.

• ECVT selector lever

• P/N position switch

DTC Logic

INFOID:0000000004216024

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the engine under the following conditions and wait for at least 1 second.

-

ECVT selector lever is in the P or N position.

-

Do not depress the brake pedal.

2. Shift to N and wait for at least 1 second.

3. Shift to any other gear and wait for at least 1 second.

4. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?

YES

>> Refer to 

SEC-57, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000004216025

1.

CHECK DTC WITH IPDM E/R

Check “Self diagnostic result” with CONSULT-III. Refer to 

SEC-170, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace malfunctioning parts.

2.

CHECK DTC WITH HV ECU

Check “Self diagnostic result” with CONSULT-III. Refer to 

HBC-619, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace malfunctioning parts.

3.

CHECK PNP SWITCH CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect hybrid vehicle control ECU harness connector and BCM harness connector.

DTC

Self-diagnosis 

name

DTC detecting condition

Possible causes

B2603

SHIFT POSITION 

STATUS

BCM detects the followings status for 500 ms or more when 
shift is in P position and, ignition switch is in ON position.
• Park/neutral position (PNP) switch: approx. 0V
• ECVT device (detention switch): approx 0V

• Harness or connector

(ECVT device circuit is open 
or shorted.)

• Harness or connectors

[Park/neutral position (PNP) 
switch circuit is open or 
shorted.]

• ECVT device (detention 

switch)

• Park/neutral position (PNP) 

switch

SEC-58

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2603 SHIFT POSITION STATUS

3. Check continuity between hybrid vehicle control ECU harness

connector E65 (A) terminal 37 and BCM harness connector M18

(B) terminal 48.

4. Check continuity between hybrid vehicle control ECU harness

connector E65 (A) terminal 37 and ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair harness or connector.

4.

CHECK ECVT DEVICE POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECVT device (detention switch) harness connector.

3. Check voltage between ECVT device (detention switch) harness

connector and ground.

Is the inspection result normal?

YES

>> GO TO 6

NO

>> GO TO 5

5.

CHECK ECVT DEVICE POWER SUPPLY CIRCUIT

1. Disconnect BCM harness connector.

2. Check continuity between BCM harness connector M19 (A) ter-

minal 84 and ECVT device (detention switch) harness connector

M23 (B) terminal 8.

3. Check continuity between BCM harness connector M19 (A) ter-

minal 84 and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-87, "Removal and Installation"

.

NO

>> Repair harness or connector.

6.

CHECK ECVT DEVICE CIRCUIT

1. Disconnect BCM harness connector.

Hybrid vehicle control ECU

BCM

Continuity

Connector

Terminal

Connector

Terminal

A:  E65

37

B:  M18

48

Yes

Hybrid vehicle control ECU

Ground

Continuity

Connector

Terminal

A: E65

37

Ground

No

ALKIA0449ZZ

ECVT device (detention switch)

Ground

Voltage [V]

Connector

Terminal

M23

8

Ground

Battery voltage

ALKIA0444ZZ

BCM

ECVT device (detention switch)

Continuity

Connector

Terminal

Connector

Terminal

A: M19

84

B: M23

8

Yes

BCM

Ground

Continuity

Connector

Terminal

A: M19

84

Ground

No

ALKIA0445ZZ

B2603 SHIFT POSITION STATUS

SEC-59

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

2. Check continuity between BCM harness connector M19 (A) ter-

minal 87 and ECVT device (detention switch) harness connector

M23 (B) terminal 9.

3. Check continuity between BCM harness connector M19 (A) ter-

minal 87 and ground.

Is the inspection result normal?

YES

>> GO TO 7

NO

>> Repair harness or connector.

7.

CHECK ECVT DEVICE

Refer to 

SEC-54, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8

NO

>> Replace ECVT device. Refer to 

TM-27, "Removal and Installation"

.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-42, "Intermittent Incident"

.

>> Inspection End.

BCM

ECVT device

(detention switch)

Continuity

Connector

Terminal

Connector

Terminal

A:  M19

87

B:  M23

9

Yes

BCM

Ground

Continuity

Connector

Terminal

A: M19

87

Ground

No

ALKIA0446ZZ

SEC-60

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2604 PNP SWITCH

B2604 PNP SWITCH

Description

INFOID:0000000004216026

BCM confirms the shift position with the following 3 signals.

• ECVT selector lever

• P/N position switch

• P position signal from hybrid vehicle control ECU

DTC Logic

INFOID:0000000004216027

DTC DETECTION LOGIC

NOTE:

• If DTC B2604 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

SEC-28, "DTC Logic"

.

• If DTC B2604 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

SEC-29, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the hybrid system under the following conditions and wait for at least 1 second.

-

ECVT selector lever is in the P or N position

-

Do not depress the brake pedal

-

Use ECVT selector lever to select each gear, one at a time. Wait at each gear position for at least 1 sec-

ond. 

2. Check “Self diagnostic result” with CONSULT-III.
Is DTC detected?

YES

>> Refer to 

SEC-60, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000004216028

1.

CHECK DTC WITH HV ECU

Check “Self diagnostic result” with CONSULT-III. Refer to 

HBC-619, "DTC Index"

.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace malfunctioning parts.

2.

CHECK PNP SWITCH CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect hybrid vehicle control ECU harness connector and BCM harness connector.

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

B2604

PNP SWITCH

BCM detects the following status for 500 ms or 
more when the ignition switch is in the ON position.
• N position input signal exists. Shift position signal 

from hybrid vehicle control ECU does not exist.

• N position input signal does not exist. Shift posi-

tion signal from hybrid vehicle control ECU ex-
ists.

• Harness or connectors 

[The park/neutral position (PNP) 
switch circuit is open or shorted.] 

• Park/ neutral position (PNP) switch
• HV ECU