Infiniti QX56 (Z62). Manual - part 1173

SEC-82

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2602 SHIFT POSITION

B2602 SHIFT POSITION

DTC Logic

INFOID:0000000006226233

DTC DETECTION LOGIC

NOTE:
• If DTC B2602 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-70, "DTC Logic"

.

• If DTC B2602 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to

BCS-71, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine.

2.

Drive vehicle at a speed of 4 km/h (2.5 MPH) or more for 10 seconds or more.

3.

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

Is DTC detected?

YES

>> Go to 

SEC-82, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226234

1.

CHECK DTC OF COMBINATION METER

Check DTC in “Self Diagnostic Result” mode of “METER/M&A” using CONSULT-III.

Is DTC detected?

YES

>> Perform the trouble diagnosis related to the detected DTC. Refer to 

MWI-43, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK A/T SHIFT SELECTOR POWER SUPPLY

1.

Turn ignition switch OFF.

2.

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

3.

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 3.

3.

CHECK A/T SHIFT SELECTOR POWER SUPPLY CIRCUIT

1.

Disconnect BCM connector.

2.

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

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B2602

SHIFT POSITION

BCM detects the following status for 10 seconds.
• Selector lever is in the P position
• Vehicle speed is 4 km/h (2.5 MPH) or more
• Ignition switch is in the ON position

• Harness or connectors

(CAN communication line is open or 
shorted.)

• Harness or connectors

[A/T shift selector (detention switch) 
circuit is open or shorted.]

• A/T shift selector (detention switch)
• Combination meter
• BCM

(+)

(–)

Voltage (V)

(Approx.)

A/T shift selector (detention switch)

Connector

Terminal

M57

13

Ground

12

B2602 SHIFT POSITION

SEC-83

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

3.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness.

4.

REPLACE BCM

1.

Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

2.

Perform initialization of BCM and registration of all Intelligent Keys using CONSULT-III.
For initialization and registration procedures, refer to CONSULT-III Operation Manual NATS-IVIS/NVIS.

>> INSPECTION END

5.

CHECK A/T SHIFT SELECTOR CIRCUIT

1.

Disconnect BCM connector and IPDM E/R connector.

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.

6.

CHECK A/T SHIFT SELECTOR (DETENTION SWITCH)

Refer to 

SEC-83, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace A/T shift selector. Refer to 

TM-176, "Removal and Installation"

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000006226235

1.

CHECK A/T SHIFT SELECTOR (DETENTION SWITCH)

1.

Turn ignition switch OFF.

2.

Disconnect A/T shift selector connector.

3.

Check continuity between A/T shift selector (detention switch) terminals.

A/T shift selector (detention switch)

BCM

Continuity

Connector

Terminal

Connector

Terminal

M57

13

M71

104

Existed

A/T shift selector (detention switch)

Ground

Continuity

Connector

Terminal

M57

13

Not existed

A/T shift selector (detention switch)

BCM

Continuity

Connector

Terminal

Connector

Terminal

M57

14

M68

37

Existed

A/T shift selector (detention switch)

Ground

Continuity

Connector

Terminal

M57

14

Not existed

SEC-84

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2602 SHIFT POSITION

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace A/T shift selector. Refer to 

TM-176, "Removal and Installation"

.

A/T shift selector (detention switch)

Condition

Continuity

Terminal

13

14

Selector lever

P position

Not existed

Other than above

Existed

B2603 SHIFT POSITION

SEC-85

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B2603 SHIFT POSITION

DTC Logic

INFOID:0000000006226236

DTC DETECTION LOGIC

NOTE:
• If DTC B2603 is displayed with DTC B2601, first perform the trouble diagnosis for DTC B2601. Refer to

SEC-79, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PERFORM DTC CONFIRMATION PROCEDURE 1

1.

Shift the selector lever to the P position.

2.

Turn ignition switch ON and wait 1 second or more.

3.

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

Is DTC detected?

YES

>> Go to 

SEC-85, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE 2

1.

Shift the selector lever to any position other than P, and wait 1 second or more.

2.

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

Is DTC detected?

YES

>> Go to 

SEC-85, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226237

1.

INSPECTION START

Perform inspection in accordance with procedure that confirms DTC.

Which procedure confirms DTC?

DTC confirmation procedure 1>>GO TO 2.
DTC confirmation procedure 2>>GO TO 6.

2.

CHECK DTC OF TCM

Check DTC in “Self Diagnostic Result” mode of “TCM” using CONSULT-III.

Is DTC detected?

YES

>> Perform the trouble diagnosis related to the detected DTC. Refer to 

TM-78, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK BCM INPUT SIGNAL

1.

Turn ignition switch ON.

2.

Check voltage between BCM harness connector and ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible causes

B2603

SHIFT POSI STATUS

BCM detects the following status when ignition 
switch is in the ON position.
• P position signal from TCM: approx. 0 V
• A/T shift selector (detention switch) signal: 

approx. 0 V

• Harness or connector

[A/T shift selector (detention switch) 
circuit is open or shorted.]

• Harness or connectors

(TCM circuit is open or shorted.)

• A/T shift selector (detention switch)
• A/T assembly (TCM)
• BCM