Infiniti QX56 (Z62). Manual - part 1311

TOW MODE SYSTEM

TM-153

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B]

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TOW MODE SYSTEM

Component Function Check

INFOID:0000000006226876

1.

CHECK TOW MODE INDICATOR LAMP FUNCTION

1.

Turn ignition switch ON.

2.

Check that tow mode indicator lamp turns ON/OFF when tow mode switch is operated.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

TM-153, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006226877

NOTE:
Tow mode switch is integrated in to SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models). 

1.

CHECK DTC OF TCM

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Perform “Self-Diagnostic Results” in “TRANSMISSION”.

Is any DTC detected?

YES

>> Check DTC detected item. Refer to 

TM-78, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK DTC OF COMBINATION METER

 With CONSULT-III

Perform “Self-Diagnostic Results” in “METER/M&A”.

Is any DTC detected?

YES

>> Check DTC detected item. Refer to 

MWI-43, "DTC Index"

.

NO

>> GO TO 3.

3.

CHECK COMBINATION METER

 With CONSULT-III

1.

Select “TOW MODE IND” in “Data Monitor” in “METER/M&A”.

2.

Check that “TOW MODE IND” turns ON/OFF when tow mode switch is operated.

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-85, "Exploded View"

.

NO

>> GO TO 4.

4.

CHECK TOW MODE SWITCH SIGNAL

 With CONSULT-III

1.

Select “TOW MODE SW” in “Data Monitor” in “TRANSMISSION”.

2.

Check that “TOW MODE SW” turns ON/OFF when tow mode switch is operated.

Is the inspection result normal?

YES

>> Replace combination meter. Refer to 

MWI-85, "Exploded View"

.

NO

>> GO TO 5.

5.

CHECK TOW MODE SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assem-
bly connector (4WD models).

3.

Turn ignition switch ON.

4.

Check voltage between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminals. 

TM-154

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B]

TOW MODE SYSTEM

*1: 2WD models
*2: 4WD models

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 9.

6.

CHECK TOW MODE SWITCH

Check tow mode switch. Refer to 

TM-155, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Repair or replace damaged parts.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace damaged parts.

8.

CHECK TOW MODE SYSTEM

1.

Replace the control valve & TCM. Refer to 

TM-182, "Exploded View"

.

2.

Reinstall any parts removed.

3.

Check tow mode system. Refer to 

TM-153, "Component Function Check"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace combination meter. Refer to 

TM-182, "Exploded View"

.

9.

CHECK GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminal and ground. 

*1: 2WD models
*2: 4WD models

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Repair or replace damaged parts.

10.

CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MOD-

ELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 1)

1.

Disconnect combination meter connector.

2.

Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminal and combination
meter vehicle side harness connector terminal. 

SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD switch assembly 

(4WD models)

Voltage (Approx.)

Connector

Terminal

+

–

M54

*1

M147

*2

23

20

Battery voltage

SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD 

models) or 4WD switch assembly (4WD models)

Ground

Continuity

Connector

Terminal

M54

*1

M147

*2

20

Existed

TOW MODE SYSTEM

TM-155

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B]

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*1: 2WD models
*2: 4WD models

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Repair or replace damaged parts.

11.

CHECK HARNESS BETWEEN SNOW MODE/TOW MODE/VDC OFF SWITCH ASSEMBLY (2WD MOD-

ELS) OR 4WD SWITCH ASSEMBLY (4WD MODELS) AND COMBINATION METER (PART 2)

Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD
switch assembly connector (4WD models) vehicle side harness connector terminal and ground. 

*1: 2WD models
*2: 4WD models
Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Repair or replace damaged parts.

12.

CHECK COMBINATION METER

1.

Reconnect all the connectors.

2.

Check combination meter input/output signal. Refer to 

MWI-35, "Reference Value"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Replace combination meter. Refer to 

MWI-85, "Exploded View"

.

Component Inspection

INFOID:0000000006226878

NOTE:
Tow mode switch is integrated in to SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or
4WD switch assembly (4WD models).

1.

CHECK TOW MODE SWITCH

Check continuity between SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD models) or 4WD
switch assembly (4WD models) connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace tow mode switch. Refer to 

TM-181, "Removal and Installation"

.

SNOW MODE/TOW MODE/VDC OFF switch as-

sembly (2WD models) or 4WD switch assembly 

(4WD models)

Combination meter

Continuity

Connector

Terminal

Connector

Terminal

M54

*1

M147

*2

23

M34

7

Existed

SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD 

models) or 4WD switch assembly (4WD models)

Ground

Continuity

Connector

Terminal

M54

*1

M147

*2

23

Not existed

SNOW MODE/TOW MODE/VDC OFF switch assembly (2WD 

models) or 4WD switch assembly (4WD models)

Condition

Continuity

Terminal

23

20

Tow mode switch is depressed

Existed

Tow mode switch is released

Not existed

TM-156

< DTC/CIRCUIT DIAGNOSIS >

[7AT: RE7R01B]

SHIFT POSITION INDICATOR CIRCUIT

SHIFT POSITION INDICATOR CIRCUIT

Description

INFOID:0000000006226879

TCM transmits a shift position signal to the combination meter via CAN communication line. While the vehicle
is running, the combination meter displays a shift position in the information display, according to this signal.
Refer to 

MWI-9, "METER SYSTEM : System Diagram"

.

Component Function Check

INFOID:0000000006226880

1.

CHECK A/T INDICATOR 

CAUTION:

Always drive vehicle at a safe speed.
1.

Start the engine.

2.

Check the actual selector lever position (“P”, “R”, “N” and “D”) and the indication of the shift position indi-
cator mutually coincide.

3.

Drive vehicle in the manual mode, and then check that the actual gear position and the indication of the
shift position indicator mutually coincide when the selector lever is shifted to “UP (+ side)” or “DOWN (

−

side)” side (1GR 

⇔

 7GR).

 Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

TM-156, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006226881

1.

CHECK INPUT SIGNALS 

 With CONSULT-III

1.

Start the engine.

2.

Select “SLCT LVR POSI” in “Data Monitor” in “TRANSMISSION”.

3.

Check the actual selector lever position (“P”, “R”, “N” and “D”) and the indication of the “SLCT LVR POSI”
mutually coincide. Refer to 

TM-68, "Reference Value"

.

4.

Drive vehicle in the manual mode, and then check that the actual gear position and the indication of the
“SLCT LVR POSI” mutually coincide when the selector lever is shifted to the “UP (+ side)” or “DOWN (

−

side)” side (1GR 

⇔

 7GR). Refer to 

TM-68, "Reference Value"

.

 Is the inspection result normal?

YES

>> INSPECTION END

NO-1 [The actual gear position does not change, or shifting into the manual mode is not possible (no gear
shifting in the manual mode possible). Or the shift position indicator is not indicated.]>>•Check manual

mode switch. Refer to 

TM-146, "Component Inspection (Manual Mode Switch)"

.

• Check A/T main system (Fail-safe function actuated). 
- Perform “Self Diagnostic Results” in “TRANSMISSION”. Refer to 

TM-78, "DTC Index"

.

NO-2 (The actual gear position changes, but the shift position indicator is not indicated.)>>Perform 

“Self

Diagnostic Results” in “TRANSMISSION”. Refer to 

TM-78, "DTC Index"

.

NO-3 (The actual gear position and the indication on the shift position indicator do not coincide.)>>Perform

“Self Diagnostic Results” in “TRANSMISSION”. Refer to 

TM-78, "DTC Index"

.

NO-4 (Only a specific position or positions is/are not indicated on the shift position indicator.)>>Check 

the

combination meter. Refer to 

MWI-35, "Reference Value"

.