Nissan Pathfinder (2011 year). Manual - part 208

DLN-202

< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

CONSULT-III Function (ALL MODE AWD/4WD)

INFOID:0000000006245059

FUNCTION

CONSULT-III can display each diagnostic item using the following direct diagnostic modes.

SELF DIAGNOSTIC RESULT

Operation Procedure

1. Connect “CONSULT-III”.
2. With engine at idle, touch “SELF-DIAG RESULTS”.

Display shows malfunction experienced since the last erasing operation.

NOTE:

The details for "TIME" are as follows:

• "0": Error currently detected with transfer control unit.

• Except for "0": Error detected in the past and memorized with transfer control unit.

Detects frequency of driving after DTC occurs (frequency of turning ignition switch "ON/OFF").

How to Erase Self-diagnostic Results

1. Perform applicable inspection of malfunctioning item and then repair or replace.
2. Start engine and select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-III.
3. Touch “ERASE” on CONSULT-III screen to erase DTC memory.

CAUTION:

If memory cannot be erased, perform applicable diagnosis.

 SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-III)

Description

If the engine starts when there is something wrong with the 4WD system, the 4WD warning lamp turns ON or

flickers in the combination meter. When the system functions properly, the warning lamp turns ON when the

ignition switch is turned to “ON”, and it turns OFF after engine starts. To locate the cause of a problem, start

the self-diagnosis function. The 4WD warning lamp in the combination meter will indicate the problem area by

flickering according to the self-diagnostic results.  Refer to 

DLN-242, "DTC Index"

.

Diagnostic Procedure

1. Warn up engine.
2. Turn ignition switch “ON” and “OFF” at least twice, and then turn ignition switch “OFF”.
3. Move A/T selector lever to “P” position.
4. Turn 4WD shift switch to “2WD” position.
5. Turn ignition switch “ON”. (Do not start engine.)
6. 4WD warning lamp ON.

If 4WD warning lamp does not turn ON, refer to 

DLN-254, "Diagnosis Procedure"

.

7. Move A/T selector lever to “R” position.
8. Turn 4WD shift switch to “2WD”, “4H” and “2WD” in order.
9. Move A/T selector lever to “P” position.
10. Turn 4WD shift switch to “4H”, “2WD” and “4H” in order.
11. Move A/T selector lever to “N” position.
12. Turn 4WD shift switch to “2WD” position.
13. Move A/T selector lever to “P” position.
14. Read the flickering of 4WD warning lamp.

Direct Diagnostic Mode

Description

Self Diagnostic Result

The transfer control unit self diagnostic results are displayed.

Data Monitor

The transfer control unit input/output data is displayed in real time.

CAN Diag Support Monitor

The result of transmit/receive diagnosis of CAN communication is diplayed.

2011 Pathfinder

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

DLN-203

< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

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Self-diagnosis example

DATA MONITOR

Operation Procedure

1. Connect “CONSULT-III.”
2. Touch “DATA MONITOR”.
3. Select from “SELECT MONITOR ITEM”, screen of data monitor mode is displayed.

NOTE:

When malfunction is detected, CONSULT-III performs REAL-TIME DIAGNOSIS.

Also, any malfunction detected while in this mode will be displayed at real time.

×

: Standard –: Not applicable

PDIA0227E

Monitor Item (Unit)

Selection

Description

ECU INPUT 

SIGNALS

MAIN

SIGNALS

SELECTION 

FROM MENU

VHCL/S SEN·FR [km/h] or [mph]

×

–

×

Wheel speed calculated by ABS actuator 
and electric unit (control unit).
Signal input with CAN communication line.

VHCL/S SEN·RR [km/h] or [mph]

×

–

×

Wheel speed calculated by TCM.
Signal input with CAN communication line.

ENGINE SPEED [rpm]

×

–

×

Engine speed is displayed.
Signal input with CAN communication line.

BATTERY VOLT [V]

×

–

×

Power supply voltage for transfer control 
unit.

2WD SWITCH [On/Off]

×

–

×

4WD shift switch signal status is displayed.
(4L means 4LO of 4WD shift switch.)

4H SWITCH [On/Off]

×

–

×

4L SWITCH [On/Off]

×

–

×

4L POSI SW [On/Off]

×

–

×

4LO switch signal status is displayed.

ATP SWITCH [On/Off]

×

–

×

ATP switch signal status is displayed.

WAIT DETCT SW [On/Off]

×

–

×

Wait detection switch signal status is dis-
played.

4WD MODE [2H/4H/4L]

–

×

×

Control status of 4WD recognized by trans-
fer control unit. (2WD, 4H or 4LO)

VHCL/S COMP [km/h] or [mph]

–

×

×

Vehicle speed recognized by transfer con-
trol unit.

SHIFT ACT 1 [On/Off]

–

×

×

Output condition to actuator motor (clock-
wise)

SHIFT AC MON1 [On/Off]

–

–

×

Check signal for transfer control unit signal 
output

SHIFT ACT 2 [On/Off]

–

×

×

Output condition to actuator motor (coun-
terclockwise)

SHIFT AC MON2 [On/Off]

–

–

×

Check signal for transfer control unit signal 
output

2011 Pathfinder

DLN-204

< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

SFT ACT/R MON [On/Off]

–

–

×

Operating condition of actuator motor relay 
(integrated in transfer control unit)

SHIFT POS SW1 [On/Off]

×

–

×

Condition of actuator position switch 1

SHIFT POS SW2 [On/Off]

×

–

×

Condition of actuator position switch 2

SHIFT POS SW3 [On/Off]

×

–

×

Condition of actuator position switch 3

SHIFT POS SW4 [On/Off]

×

–

×

Condition of actuator position switch 4

4WD FAIL LAMP [On/Off]

–

×

×

Control status of 4WD warning lamp is dis-
played.

2WD IND [On/Off]

–

–

×

Control status of 4WD shift indicator lamp 
(rear) is displayed.

4H IND [On/Off]

–

–

×

Control status of 4WD shift indicator lamp 
(front and center) is displayed.

4L IND [On/Off]

–

–

×

Control status of 4LO indicator lamp is dis-
played.

Monitor Item (Unit)

Selection

Description

ECU INPUT 

SIGNALS

MAIN

SIGNALS

SELECTION 

FROM MENU

2011 Pathfinder

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

DLN-205

< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

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NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000006245060

Use the chart below to help you find the cause of the symptom. The numbers indicate the order of the inspec-

tion. If necessary, repair or replace these parts.

Reference page

DLN-275

DLN-288

DLN-310

DLN-288

DLN-304

SUSPECTED PARTS
(Possible cause)

T

R

ANSFER F

LUID (Level

 low)

T

R

ANSFER F

LUID (W

rong)

T

R

ANSFER F

LUID (Level

 too high)

LI

QUI

D

 GASKET (Dam

ag

ed

)

O-RI

NG (W

orn

 or da

ma

ge

d)

OIL

 SEAL

 (W

orn

 or da

ma

ge

d)

S

H

IFT 

FO

RK

 (W

orn

 or d

am

a

ged

)

GEAR (W

orn

 o

r da

ma

ge

d)

B

EARING

 (W

orn

 or 

da

ma

ge

d)

Symptom

Noise

1

2

3

3

Transfer  fluid  leakage

3

1

2

2

2

Hard to shift or will not shift

1

1

2

2011 Pathfinder

DLN-206

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

DTC/CIRCUIT DIAGNOSIS

P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL
UNIT

Description

INFOID:0000000006245061

The transfer control unit controls the transfer control device which controls shifts between 4H and 4LO and

between 2WD and 4WD.  When the vehicle battery is removed, the power supply to the transfer control unit is

interrupted, and self-diagnosis memory function is suspended.  These DTCs may also set when the power

supply voltage for the transfer control unit is abnormally low while driving.

DTC Logic

INFOID:0000000006245062

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Are DTCs “P1801 or P1811 detected?

YES

>> Perform diagnosis procedure. Refer to 

DLN-206, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000006245063

Regarding Wiring Diagram information, refer to 

DLN-245, "Wiring Diagram"

.

1.

CHECK POWER SUPPLY

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

2. Disconnect transfer control unit harness connector.

3. Check voltage between transfer control unit harness connector

terminals and ground.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1801]

*INITIAL START*

Due to removal of battery which cuts off 
power supply to transfer control unit, 
self-diagnosis memory function is sus-
pended.

DLN-206

[P1811]

BATTERY VOLTAGE

Power supply voltage for transfer control 
unit is abnormally low while driving.

Connector

Terminal

Voltage (Approx.)

M165

19 - Ground

Battery voltage

25 - Ground

0V

M166

40 - Ground

Battery voltage

44 - Ground

0V

45 - Ground

SDIA3360E

2011 Pathfinder

P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

DLN-207

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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4. Turn ignition switch “ON”. (Do not start engine.)

5. Check voltage between transfer control unit harness connector

terminals and ground.

Is there voltage?

YES

>> GO TO 2.

NO

>> Check the following. If any items are damaged, repair or replace damaged parts.

• 40A fuse (No. 

j

, located in the fuse and fusible link box).

• 10A fuses (No. 18, located in the fuse block (J/B) and Nos. 60 and 61 located in the fuse and

relay box).

• Harness for short or open between battery and transfer control unit harness connector M165

terminal 19.

• Harness for short or open between battery and transfer shut off relay 2 harness connector E157

terminal 1 and 3.

• Harness for short or open between battery and transfer shut off relay 1 harness connector E156

terminal 3.

• Harness for short or open between ignition switch and transfer control unit harness connector

M165 terminal 25.

• Harness for short or open between ignition switch and transfer shut off relay 1 harness connec-

tor E156 terminal 1.

• Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 5

and transfer control unit harness connector M166 terminals 44, 45.

• Harness for short or open between transfer shut off relay 1 harness connector E156 terminal 5

and transfer control unit harness connector M166 terminals 44, 45.

• Harness for short or open between transfer shut off relay 2 harness connector E157 terminal 2

and transfer control unit harness connector M166 terminal 40.

• Harness for open between transfer shut off relay 1 harness connector E156 terminal 2 and

ground.

• Battery and ignition switch.

• Transfer shut off relay 1, 2. Refer to 

DLN-208, "Component Inspection"

.

2.

CHECK GROUND CIRCUIT

1. Turn ignition switch “OFF”.

2. Disconnect transfer control unit harness connector.

3. Check continuity between transfer control unit harness connec-

tor M165 terminals 6 and 18, and M166 terminal 32 and ground.

Also check harness for short to power.

Do you have continuity?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to power in harness or con-

nectors.

3.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-238, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 4.

Connector

Terminal

Voltage (Approx.)

M165

19 - Ground

Battery voltage

25 - Ground

M166

40 - Ground

44 - Ground

45 - Ground

SDIA3361E

Continuity should exist.

SDIA3362E

2011 Pathfinder

DLN-208

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1801, P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT

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.

4.

CHECK DTC

Drive vehicle and then perform Self-diagnosis.
Do DTCs P1801 or P1811 display?

YES

>> Replace transfer control unit.  Refer to 

DLN-277, "Removal and Installation"

.

NO

>> Inspection End.

Component Inspection

INFOID:0000000006245064

1. Turn ignition switch “OFF”.  (Stay for at least 5 seconds.)
2. Remove transfer shut off relay 1 and transfer shut off relay 2. Refer to 

DLN-198, "Component Parts Loca-

tion"

.

3. Apply 12V direct current between transfer shut off relay termi-

nals 1 and 2.

4. Check continuity between relay terminals 3 and 5.

5. If inspection results are not normal, replace the transfer shut off

relay 1 or 2.

Condition

Continuity

12V direct current supply between terminals 1 and 2

Yes

OFF

No

SCIA1245E

2011 Pathfinder

P1802 – P1804, P1809 TRANSFER CONTROL UNIT

DLN-209

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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P1802 – P1804, P1809 TRANSFER CONTROL UNIT

Description

INFOID:0000000006245065

The transfer control unit controls the transfer control device which controls shifts between 4H and 4LO and

between 2WD and 4WD.  A DTC may set when any of the following occur:

• Malfunction is detected in the memory (RAM) system of transfer control unit.

• Malfunction is detected in the memory (ROM) system of transfer control unit.

• Malfunction is detected in the memory (EEPROM) system of transfer control unit.

• AD converter system of transfer control unit is malfunctioning.

DTC Logic

INFOID:0000000006245066

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Are DTCs “P1802 - P1804 or P1809 detected?

YES

>> Perform diagnosis procedure. Refer to 

DLN-209, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000006245067

1.

INSPECTION START

Do you have CONSULT-III?
YES or NO

YES

>> GO TO 2.

NO

>> GO TO 3.

2.

PERFORM SELF-DIAGNOSIS (WITH CONSULT-III)

1. Turn ignition switch “ON”.

2. Select “SELF-DIAG RESULTS” mode for “ALL MODE AWD/4WD” with CONSULT-III.

3. Touch “ERASE”.

4. Turn ignition switch “OFF” and wait at least 10 seconds.

5. Perform the self-diagnosis again.
Is the “CONTROL UNIT 1 [P1802]”, “CONTROL UNIT 2 [P1803]”, “CONTROL UNIT 3 [P1804]” or CONTROL

UNIT 4 [P1809]” displayed?

YES

>> Replace transfer control unit. Refer to 

DLN-277, "Removal and Installation"

.

NO

>> Inspection End.

3.

PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-III)

1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to 

DLN-202, "CONSULT-III Func-

tion (ALL MODE AWD/4WD)"

.

2. Perform the self-diagnosis again.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1802]

CONTROL UNIT 1

Malfunction is detected in the memory 
(RAM) system of transfer control unit.

DLN-209

[P1803]

CONTROL UNIT 2

Malfunction is detected in the memory 
(ROM) system of transfer control unit.

[P1804]

CONTROL UNIT 3

Malfunction is detected in the memory 
(EEPROM) system of transfer control 
unit.

[P1809]

CONTROL UNIT 4

AD converter system of transfer control 
unit is malfunctioning.

2011 Pathfinder