Infiniti QX56 (JA60). Manual - part 287

P1827 CLUTCH PRESSURE SWITCH

DLN-71

< COMPONENT DIAGNOSIS >

[ATX14B]

C

E

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G

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DLN

N

O

P

P1827 CLUTCH PRESSURE SWITCH

Description

INFOID:0000000005148833

Improper signal from the clutch pressure switch is input due to open or short circuit.  Also, a malfunction may

have occured in clutch pressure switch or hydraulic circuit.

DTC Logic

INFOID:0000000005148834

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1827 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-71, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148835

Regarding Wiring Diagram information, refer to 

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

.

1.

CHECK CLUTCH PRESSURE SWITCH SIGNAL

With CONSULT-III

1. Start engine.

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

3. Read out ON/OFF switching action of the CL PRES SW while operating 4WD shift switch.

Without CONSULT-III

1. Start engine.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1827]

CLUTCH PRES SW

• Improper signal from clutch pressure 

switch is input due to open or short cir-
cuit.

• Malfunction occurs in clutch pressure 

switch or hydraulic circuit.

Refer to 

DLN-71

.

Condition

Display value

• Ignition switch: ON
• A/T selector lever D posi-

tion

4WD shift switch: AUTO or 4H (Wait 
function is not operating.)

ON

Ignition switch: ON

4WD shift switch: 2WD (Wait func-
tion is not operating.)

OFF

DLN-72

< COMPONENT DIAGNOSIS >

[ATX14B]

P1827 CLUTCH PRESSURE SWITCH

2. Check voltage between transfer control unit harness connector

terminals and ground.

Are inspection results normal?

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND CLUTCH PRESSURE SWITCH

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

2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness con-

nector.

3. Check continuity between transfer control unit harness connec-

tor E143 terminal 34 and transfer terminal cord assembly har-

ness connector F56 terminal 7

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.

3.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are inspection results normal?

YES

>> GO TO 4.

NO

>> Check transfer control unit pin terminals for damage or loose connection with the harness connec-

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

4.

CHECK CLUTCH PRESSURE SWITCH

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

2. Remove clutch pressure switch. Refer to 

DLN-16, "Component Parts Location"

.

3. Push and release clutch pressure switch and check continuity

between terminal 7 and ground.

Are inspection results normal?

YES 

>> GO TO 5.

NO

>> Replace clutch pressure switch.

5.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.
Are inspection results normal?

Connector

Terminal

Condition

Voltage 

(Approx.)

E143

34 - 

Ground

• Ignition switch: ON
• A/T selector lever D 

position

4WD shift switch: 
AUTO or 4H (Wait 
function is not op-
erating.)

0V

Ignition switch: ON

4WD shift switch: 
2WD (Wait function 
is not operating.)

Battery 
voltage

SDIA2746E

Continuity should exist.

SDIA2747E

Terminal

Condition

Continuity

7 - 

Ground

Push clutch pressure switch

Yes

Release clutch pressure switch

No

WDIA0171E

P1827 CLUTCH PRESSURE SWITCH

DLN-73

< COMPONENT DIAGNOSIS >

[ATX14B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

YES

>> GO TO 6.

NO

>> Replace transfer control unit. Refer to 

DLN-130, "Removal and Installation"

.

6.

CRUISE TEST

Perform cruise test. Refer to 

DLN-7, "Preliminary Check"

.

Are inspection results normal?

YES

>> Inspection End.

NO

>> Perform the applicable trouble diagnosis.

Component Inspection

INFOID:0000000005148836

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove clutch pressure switch. Refer to 

DLN-16, "Component Parts Location"

.

3. Push and release clutch pressure switch and check continuity

between terminal 7 and ground.

4. If the inspection results are abnormal replace the clutch pres-

sure switch.

Terminal

Condition

Continuity

7 - Ground

Push clutch pressure switch

Yes

Release clutch pressure switch

No

WDIA0171E

DLN-74

< COMPONENT DIAGNOSIS >

[ATX14B]

P1828 LINE PRESSURE SWITCH

P1828 LINE PRESSURE SWITCH

Description

INFOID:0000000005148837

Improper signal from line pressure switch is input due to open or short circuit.  Also, a malfunction may have

occured in the line pressure switch or hydraulic circuit.

DTC Logic

INFOID:0000000005148838

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1828 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-74, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148839

Regarding Wiring Diagram information, refer to 

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

.

1.

CHECK LINE PRESSURE SWITCH SIGNAL

With CONSULT-III

1. Start engine.

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

3. Read out ON/OFF switching action of LINE PRES SW while operating 4WD shift switch.

Without CONSULT-III

1. Start engine.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1828]

LINE PRES SW

• Improper signal from line pressure 

switch is input due to open or short cir-
cuit.

• Malfunction occurs in line pressure 

switch or hydraulic circuit.

Refer to 

DLN-74

.

Condition

Display value

• A/T selector lever D position
• 4WD shift switch: AUTO

ON

• Except the above
• The vehicle has been left 

at room temperature for 5 
minutes and more with ig-
nition switch in OFF posi-
tion.

• Ignition switch: ON
• A/T selector lever: P or N position
• 4WD shift switch: other than 

AUTO

OFF