Nissan Titan. Manual - part 111

DLN-16

< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

CONSULT Function (ALL MODE AWD/4WD)

INFOID:0000000009885955

FUNCTION

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

SELF DIAGNOSTIC RESULT

Operation Procedure

1. Connect CONSULT.
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.
3. Touch ERASE on CONSULT screen to erase DTC memory.

CAUTION:

If memory cannot be erased, perform applicable diagnosis.

 SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT)

Description

If the engine starts when there is a malfunction with the 4WD system, the 4WD warning lamp turns ON or flick-

ers in the combination meter. When the system functions properly, the warning lamp turns ON when the igni-

tion 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-59, "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-71, "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

Displays transfer control unit self-diagnosis results.

Data Monitor

Displays transfer control unit input/output data in real time.

CAN Diag Support Mntr

The results of transmit/receive diagnosis of CAN communication can be read.

DIAGNOSIS SYSTEM (TRANSFER CONTROL UNIT)

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< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

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Self-diagnosis example

DATA MONITOR

Operation Procedure

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

NOTE:

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

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

Display Item List

×: Standard –: Not applicable

PDIA0227E

Monitored item (Unit)

Monitor item selection

Remarks

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

DLN-18

< 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.

Monitored item (Unit)

Monitor item selection

Remarks

ECU INPUT 

SIGNALS

MAIN

SIGNALS

SELECTION 

FROM MENU

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

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< SYSTEM DESCRIPTION >

[TRANSFER: TX15B]

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NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting Chart

INFOID:0000000009885956

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-89

DLN-101

DLN-123

DLN-101

DLN-1

17

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