Infiniti QX56 (Z62). Manual - part 1172

 

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Infiniti QX56 (Z62). Manual - part 1172

 

 

SEC-78

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2557 VEHICLE SPEED

B2557 VEHICLE SPEED

DTC Logic

INFOID:0000000006226228

DTC DETECTION LOGIC

NOTE:
• If DTC B2557 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-70, "DTC Logic"

.

• If DTC B2557 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 and wait 10 seconds or more.

2.

Drive the vehicle at a vehicle speed of 10 km/h (6.2 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-78, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226229

1.

CHECK DTC OF “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”

Check DTC in “Self Diagnostic Result” mode of “ABS” using CONSULT-III.
Is DTC detected?

YES

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

BRC-51, "DTC Index"

.

NO

>> GO TO 2.

2.

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 3.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible causes

B2557

VEHICLE SPEED

BCM detects one of the following conditions for 10 
seconds continuously.
• Vehicle speed signal from combination meter is 10 

km/h (6.2 MPH) or more, and vehicle speed signal 
from ABS actuator and electric unit (control unit) is 
4 km/h (2.5 MPH) or less.

• Vehicle speed signal from combination meter is 4 

km/h (2.5 MPH) or less, and vehicle speed signal 
from ABS actuator and electric unit (control unit) is 
10 km/h (6.2 MPH) or more.

• Harness or connectors

(The CAN communication line is 
open or shorted.)

• Combination meter
• ABS actuator and electric unit 

(control unit)

B2601 SHIFT POSITION

SEC-79

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

B2601 SHIFT POSITION

DTC Logic

INFOID:0000000006226230

DTC DETECTION LOGIC

NOTE:
• If DTC B2601 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to

BCS-70, "DTC Logic"

.

• If DTC B2601 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.

Shift the selector lever to the P position.

2.

Turn ignition switch ON and wait 2 seconds or more.

3.

Shift the selector lever to any position other than P, and wait 2 seconds or more.

4.

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

Is DTC detected?

YES

>> Go to 

SEC-79, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006226231

1.

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 4.

NO

>> GO TO 2.

2.

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.

3.

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

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

B2601

SHIFT POSITION

When there is a difference between P range 
signal from A/T shift selector (detention switch) 
and P position signal from IPDM E/R (CAN).

• 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)
• BCM

(+)

(–)

Voltage (V)

(Approx.)

A/T shift selector (detention switch)

Connector

Terminal

M57

13

Ground

12

A/T shift selector (detention switch)

BCM

Continuity

Connector

Terminal

Connector

Terminal

M57

13

M71

104

Existed

SEC-80

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

B2601 SHIFT POSITION

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

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

4.

CHECK A/T SHIFT SELECTOR CIRCUIT (BCM)

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 5.

NO

>> Repair or replace harness.

5.

CHECK A/T SHIFT SELECTOR CIRCUIT (IPDM E/R)

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

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-81, "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

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

A/T shift selector (detention switch)

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M57

14

E17

64

Existed

B2601 SHIFT POSITION

SEC-81

< DTC/CIRCUIT DIAGNOSIS >

[WITH INTELLIGENT KEY SYSTEM]

C

D

E

F

G

H

I

J

L

M

A

B

SEC

N

O

P

Component Inspection

INFOID:0000000006226232

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.

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

 

 

 

 

 

 

 

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