Infiniti FX35, FX50 (S51). Manual - part 1663

 

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Infiniti FX35, FX50 (S51). Manual - part 1663

 

 

B2603 SHIFT POSITION STATUS

SEC-65

< DTC/CIRCUIT 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:0000000005249479

BCM confirms the shift position with the following 4 signals.
• Selector lever
• P/N position switch
• P position signal from IPDM E/R (CAN)
• P position signal from TCM (CAN)

DTC Logic

INFOID:0000000005249480

DTC DETECTION LOGIC

NOTE:
• If DTC B2603 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

SEC-31, "BCM : DTC Logic"

.

• If DTC B2603 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

SEC-33, "BCM : DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

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

-

Selector lever is in the P position.

-

Do not depress the brake pedal.

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-65, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005249481

1.

CHECK DTC WITH TCM

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

TM-150, "DTC Index"

 (VQ35HR) or refer to 

TM-332,

"DTC Index"

 (VK50VE).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CHECK TRANSMISSION RANGE SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/T assembly connector and BCM connector M123.

3.

Check continuity between TCM harness connector and BCM harness connector.

4.

Check continuity between TCM harness connector and ground.

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 the P position, and ignition 
switch is in the ON position.
• Transmission range switch: approx. 0 V
• A/T shift selector (detention switch): approx. 0 V

• Harness or connector

(A/T shift selector circuit is open or 
shorted)

• Harness or connectors

[Transmission range switch circuit is 
open or shorted]

• A/T shift selector (detention switch)
• Transmission range switch
• BCM

A/T assembly

BCM

Continuity

Connector

Terminal

Connector

Terminal

F51

9

M123

140

Existed

SEC-66

< DTC/CIRCUIT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2603 SHIFT POSITION STATUS

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK A/T SHIFT SELECTOR POWER SUPPLY

1.

Disconnect A/T shift selector (detention switch) connector.

2.

Check voltage between A/T shift selector (detention switch) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK A/T SHIFT SELECTOR POWER SUPPLY CIRCUIT

1.

Disconnect BCM connector M122.

2.

Check continuity between A/T shift selector (detention switch) harness connector and BCM harness con-
nector.

3.

Check continuity between A/T shift selector (detention switch) harness connector and ground.

Is the inspection result normal?

YES

>> Replace BCM. Refer to 

BCS-83, "Removal and Installation"

.

NO

>> Repair or replace harness.

5.

CHECK A/T SHIFT SELECTOR CIRCUIT

1.

Disconnect BCM connector M122 and IPDM E/R connector E6.

2.

Check continuity between A/T shift selector (detention switch) harness connector and BCM harness con-
nector.

3.

Check continuity between A/T shift selector (detention switch) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness.

A/T assembly

Ground

Continuity

Connector

Terminal

F51

9

Not existed

(+)

(–)

Voltage (V)

(Approx.)

A/T shift selector (detention switch)

Connector

Terminal

M137

10

Ground

Battery voltage

A/T shift selector (detention switch)

BCM

Continuity

Connector

Terminal

Connector

Terminal

M137

10

M122

96

Existed

A/T shift selector (detention switch)

Ground

Continuity

Connector

Terminal

M137

10

Not existed

A/T shift selector (detention switch)

BCM

Continuity

Connector

Terminal

Connector

Terminal

M137

11

M122

99

Existed

A/T shift selector (detention switch)

Ground

Continuity

Connector

Terminal

M137

11

Not existed

B2603 SHIFT POSITION STATUS

SEC-67

< DTC/CIRCUIT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

6.

CHECK A/T SHIFT SELECTOR (DETENTION SWITCH)

Refer to 

SEC-62, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace A/T shift selector. Refer to 

TM-169, "Removal and Installation"

 (VQ35HR) or 

TM-351,

"Removal and Installation"

 (VK50VE).

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

SEC-68

< DTC/CIRCUIT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

B2604 PNP SWITCH

B2604 PNP SWITCH

Description

INFOID:0000000005249482

BCM confirms the shift position with the following 4 signals.
• Selector lever
• P/N position switch
• P position signal from IPDM E/R (CAN)
• P position signal from TCM (CAN)

DTC Logic

INFOID:0000000005249483

DTC DETECTION LOGIC

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

SEC-31, "BCM : DTC Logic"

.

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

SEC-33, "BCM : DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

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

-

Selector lever is in the P or N position

-

Do not depress the brake pedal

2.

Check “Self diagnostic result” with CONSULT-III.

Is DTC detected?

YES

>> Go to 

SEC-68, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005249484

1.

CHECK DTC WITH TCM

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

TM-150, "DTC Index"

 (VQ35HR) or refer to 

TM-332,

"DTC Index"

 (VK50VE).

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

CHECK TRANSMISSION RANGE SWITCH SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect A/T assembly connector and BCM connector M123.

3.

Check continuity between A/T assembly harness connector and BCM harness connector.

4.

Check continuity between A/T assembly harness connector and ground.

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 ON position.
• N position input signal exists. Shift position signal 

from TCM does not exist.

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

tion signal from TCM exists.

• Harness or connectors 

[Transmission range switch circuit 
is open or shorted] 

• Transmission range switch
• TCM

A/T assembly

BCM

Continuity

Connector

Terminal

Connector

Terminal

F51

9

M123

140

Existed

 

 

 

 

 

 

 

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