Infiniti QX56 (JA60). Manual - part 298

HEAVY TIGHT-CORNER BRAKING SYMPTOM OCCURS

DLN-115

< SYMPTOM DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

Are the inspection results normal?

YES

>> Inspection End.

NO

>> Repair or replace damaged parts.

DLN-116

< SYMPTOM DIAGNOSIS >

[ATX14B]

ATP SWITCH

ATP SWITCH

Description

INFOID:0000000005148873

The ATP indicator is ON when the transfer case is not in neutral.

Diagnosis Procedure

INFOID:0000000005148874

Regarding Wiring Diagram information, refer to 

DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"

.

1.

CHECK ATP SWITCH SIGNAL

With CONSULT-III

1. Start engine.

2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.

3. Read out the value of ATP SWITCH.

Without CONSULT-III

1. Start engine.

2. Check voltage between transfer control unit harness connector

terminal and ground.

Are inspection results normal?

YES 

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ATP SWITCH

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Disconnect transfer control unit harness connector and the ATP switch harness connector.

3. Check continuity between transfer control unit harness connec-

tor E143 terminal 40 and ATP switch harness connector F55 ter-

minal 8.

Also check harness for short to ground and short to power.

Are inspection results normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

Condition

Display value

• Vehicle stopped
• Engine running
• A/T selector lever 

N

• Brake pedal de-

pressed

4WD shift switch
: 4H to 4LO or 4LO to 4H
(While actuator motor is operating.)

 ON

Except the above

OFF

Connector

Terminal

Condition

Voltage 

(Approx.)

E143

40 - 

Ground

• Vehicle stopped
• Engine running
• A/T selector lever 

N

• Brake pedal de-

pressed

4WD shift switch: 4H 
to 4LO or 4LO to 4H
(While actuator motor 
is operating.)

0V

Except the above

Battery 
voltage

SDIA2755E

Continuity should exist.

SDIA2756E

ATP SWITCH

DLN-117

< SYMPTOM DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

3.

CHECK GROUND CIRCUIT

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Disconnect ATP switch harness connector.

3. Check continuity between ATP switch harness connector F55

terminal 9 and ground.

Also check harness for short to ground and short to power.

Are inspection results normal?

YES 

>> GO TO 4.

NO

>> Repair open circuit or short to ground or short to power

in harness or connectors.

4.

CHECK ATP SWITCH 

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Disconnect ATP switch harness connector.

3. Remove ATP switch. Refer to 

DLN-16, "Component Parts Location"

.

4. Push and release ATP switch and check continuity between ATP

switch terminals 8 and 9.

Are inspection results normal?

YES

>> GO TO 5.

NO

>> Replace ATP switch.

5.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are inspection results normal?

YES

>> GO TO 6.

NO

>> Check transfer control unit pin terminals for damage or loose connection with harness connector.

If any items are damaged, repair or replace damaged parts.

6.

CHECK ATP WARNING LAMP

1. Turn ignition switch ON.  (Do not start engine.)

2. Move A/T selector lever to P position.

3. Set 4WD shift switch from 4H to 4LO or 4LO to 4H.
Does ATP warning lamp turn ON while switching?

YES

>> Inspection End.

NO

>> GO TO 

DLN-109, "Diagnosis Procedure"

.

Continuity should exist.

SDIA2394E

Terminal

Condition

Continuity

8 - 9

Push ATP switch

Yes

Release ATP switch

No

SDIA2757E

DLN-118

< SYMPTOM DIAGNOSIS >

[ATX14B]

4WD SYSTEM DOES NOT OPERATE

4WD SYSTEM DOES NOT OPERATE

Description

INFOID:0000000005148875

The vehicle can not be put into 4WD mode.  (Possible hydraulic malfunction)

Diagnosis Procedure

INFOID:0000000005148876

1.

CHECK SYSTEM FOR 4WD SHIFT SWITCH

Perform trouble diagnosis for 4WD shift switch system. Refer to 

DLN-32, "Diagnosis Procedure"

.

Are the inspection results normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts.

2.

CHECK SYSTEM FOR CLUTCH PRESSURE SWITCH

Perform trouble diagnosis for clutch pressure switch system. Refer to 

DLN-71, "Diagnosis Procedure"

.

Are the inspection results normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

SYMPTOM CHECK

Check again.
Are the inspection results normal?

YES

>> Inspection End.

NO

>> GO TO 4.

4.

CHECK TRANSFER CONTROL UNIT

 Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 5.

NO

>> Check transfer control unit pin terminals for damage or loose connection with harness connector.

If any items are damaged, repair or replace damaged parts.

5.

CHECK TRANSFER INNER PARTS

1. Disassemble transfer assembly. Refer to 

DLN-142, "Disassembly and Assembly"

.

2. Check transfer inner parts.
Are the inspection results normal?

YES

>> Inspection End.

NO

>> Repair or replace damaged parts.