Nissan Frontier. Manual - part 288

DLN-54

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000009479679

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000009479680

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT

1. Turn the ignition switch ON.

2. Perform transfer control unit self-diagnosis. Refer to 

DLN-17, "CONSULT Function (ALL MODE AWD/

4WD)"

.

Is DTC U1000 detected?

YES 

>> Proceed to diagnosis procedure. Refer to 

DLN-54, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009479681

Proceed to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

Transfer control unit is not transmitting/
receiving CAN communication signal for 
2 seconds or more.

• CAN communication error
• Malfunction of transfer control unit

U1010 CONTROL UNIT (CAN)

DLN-55

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

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U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000009479682

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000009479683

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT

1. Turn the ignition switch ON.

2. Perform transfer control unit self-diagnosis. Refer to 

DLN-17, "CONSULT Function (ALL MODE AWD/

4WD)"

.

Is DTC U1010 detected?

YES 

>> Proceed to diagnosis procedure. Refer to 

DLN-55, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009479684

1.

CHECK TRANSFER CONTROL UNIT CONNECTOR

Check transfer control unit connectors for disconnection and deformation.
Is the inspection result normal? 

YES

>> Replace transfer control unit. Refer to 

DLN-92, "Removal and Installation"

.

NO

>> Repair or replace parts as necessary.

DTC

Display item

Malfunction detected condition

Possible cause

U1010

CONTROL UNIT (CAN)

Detecting error during the initial diagno-
sis of CAN controller of transfer control 
unit.

Malfunction of transfer control unit

DLN-56

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

ECU DIAGNOSIS INFORMATION

TRANSFER CONTROL UNIT

Reference Value

INFOID:0000000009479685

VALUE ON THE DIAGNOSIS TOOL

CONSULT data monitor item

Monitored item [Unit]

Content

Condition

Display value

VHCL/S SEN-FR [km/h] 
or [mph]

Wheel speed (Front wheel)

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condi-
tion.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 

±10%)

VHCL/S SEN-RR [km/h] 
or [mph]

Wheel speed (Rear wheel)

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condi-
tion.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 

±10%)

ENGINE SPEED [rpm]

Engine speed

Engine stopped
(Engine speed: Less than 400 rpm)

0 rpm

Engine running
(Engine speed: 400 rpm or more)

Approximately 
equal to the indica-
tion on tachometer

BATTERY VOLT [V]

Power supply voltage for 
transfer control unit

Ignition switch: ON

Battery voltage

2WD SWITCH [On/Off]

Input condition from 4WD 
shift switch

4WD shift switch: 2WD

On

4WD shift switch: 4H and 4LO

Off

4H SWITCH [On/Off]

Input condition from 4WD 
shift switch

4WD shift switch: 4H

On

4WD shift switch: 2WD and 4LO

Off

4L SWITCH [On/Off]

Input condition from 4WD 
shift switch

4WD shift switch: 4LO

On

4WD shift switch: 2WD and 4H

Off

4L POSI SW [On/Off]

Condition of 4LO switch

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch: 4LO

On

Except the above

Off

ATP SWITCH [On/Off]

Condition of ATP switch

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

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

 On

Except the above

Off

WAIT DETCT SW [On/
Off]

Condition of wait detection 
switch

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch
: 4H and 4LO

On

4WD shift switch: 2WD

Off

4WD MODE [2H/4H/4L]

Control status of 4WD
(Output condition of 4WD 
shift indicator lamp and 
4LO indicator lamp)

4WD shift switch
(Engine running)

2WD

2H

4H

4H

4LO

4L

TRANSFER CONTROL UNIT

DLN-57

< ECU DIAGNOSIS INFORMATION >

[TRANSFER: TX15B]

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PHYSICAL VALUES

VHCL/S COMP [km/h] or 
[mph]

Vehicle speed

Vehicle stopped

0 km/h (0 mph)

Vehicle running

CAUTION:

Check air pressure of tire under standard condi-
tion.

Approximately 
equal to the indica-
tion on speedome-
ter (Inside of 

±10%)

SHIFT ACT 1 [On/Off]

Output condition to actua-
tor motor (clockwise)

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch
: 2WD to 4H or 4H to 4LO 
or 2WD to 4LO

On

Except the above

Off

SHIFT AC MON1 [On/
Off]

Check signal for transfer 
control unit signal output

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch
: 2WD to 4H or 4H to 4LO 
or 2WD to 4LO

On

Except the above

Off

SHIFT ACT 2 [On/Off]

Output condition to actua-
tor motor (counterclock-
wise)

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch
: 4LO to 4H or 4H to 2WD 
or 4LO to 2WD

On

Except the above

Off

SHIFT AC MON2 [On/
Off]

Check signal for transfer 
control unit signal output

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch
: 4LO to 4H or 4H to 2WD 
or 4LO to 2WD

On

Except the above

Off

SHIFT ACT/R MON [On/
Off]

Operating condition of ac-
tuator motor relay (integrat-
ed in transfer control unit)

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

When 4WD shift switch is 
operated

On

When 4WD shift switch is 
not operated

Off

SHIFT POS SW1 [On/
Off]

Condition of actuator posi-
tion switch 1

• Vehicle stopped
• Engine running
• A/T selector lever “N” 

position

• Brake pedal depressed

4WD shift switch: 2WD 
and 4LO

On

4WD shift switch: 4H

Off

SHIFT POS SW2 [On/
Off]

Condition of actuator posi-
tion switch 2

4WD shift switch: 4LO

On

4WD shift switch: 2WD 
and 4H

Off

SHIFT POS SW3 [On/
Off]

Condition of actuator posi-
tion switch 3

4WD shift switch: 2WD 
and 4H

On

4WD shift switch: 4LO

Off

SHIFT POS SW4 [On/
Off]

Condition of actuator posi-
tion switch 4

4WD shift switch: 4H and 
4LO

On

4WD shift switch: 2WD

Off

4WD FAIL LAMP [On/
Off]

4WD warning lamp condi-
tion

4WD warning lamp: On

On

4WD warning lamp: Off

Off

2WD IND [On/Off]

Rear indicator of 4WD shift 
indicator lamp condition

Rear indicator of 4WD shift indicator lamp: On

On

Rear indicator of 4WD shift indicator lamp: Off

Off

4H IND [On/Off]

Front and center indicator 
of 4WD shift indicator lamp 
condition

Front and center indicator of 4WD shift indicator lamp
: ON

On

Front and center indicator of 4WD shift indicator lamp
: OFF

Off

4L IND [On/Off]

4LO indicator lamp condi-
tion

4LO indicator lamp: On

On

4LO indicator lamp: Off

Off

Monitored item [Unit]

Content

Condition

Display value