Nissan Frontier D40. Manual - part 258

P1819 TRANSFER CONTROL DEVICE

DLN-53

< COMPONENT 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
terminal and ground.

Are the inspection results normal?

YES

>> GO TO 4.

NO

>>

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

• Harness for short or open between battery and trans-

fer shut off relay 2 harness connector E157 terminal 1.

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

and transfer control unit harness connector M153 terminal 40.

• Transfer shut off relay 2.

4.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-55, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 5 (With CONSULT-III) or GO TO 6 (Without CONSULT-III).

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.

PERFORM SELF-DIAGNOSIS (WITH CONSULT-III)

With CONSULT-III

1.

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

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 “SHIFT ACT CIR [P1819]” displayed?

YES

>> Replace transfer control unit. Refer to 

DLN-94, "Removal and Installation"

.

NO

>> Inspection End.

6.

PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-III)

Without CONSULT-III

1.

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

DLN-17, "CONSULT-III Func-

tion (ALL MODE AWD/4WD)"

.

2.

Perform the self-diagnosis again.

Do the self-diagnostic results indicate transfer control device?

YES

>> Replace transfer control unit. Refer to 

DLN-94, "Removal and Installation"

.

NO

>> Inspection End.

Connector

Terminal

Voltage (Approx.)

M153

40 - Ground

0V

SDIA2820E

DLN-54

< COMPONENT DIAGNOSIS >

[TRANSFER: TX15B]

P1820 ENGINE SPEED SIGNAL

P1820 ENGINE SPEED SIGNAL

Description

INFOID:0000000005275455

The ECM transmits the engine speed signal via CAN communication to the transfer control unit.  DTC P1820
will set when either of the following occur:
• Malfunction is detected in engine speed signal that is output from the ECM.
• Improper signal is input while driving.

DTC Logic

INFOID:0000000005275456

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Perform self-diagnosis.

Is DTC P1820 detected?

YES

>> Perform diagnosis procedure. Refer to 

DLN-54, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005275457

1.

CHECK DTC WITH ECM

Perform self-diagnosis with ECM. Refer to 

EC-69, "CONSULT-III Function (ENGINE)"

.

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 2.

2.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-55, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 3.

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.

3.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.

Is DTC P1820 displayed?

YES

>> Perform self-diagnosis with ECM again.

NO

>> Inspection End.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1820]

ENGINE SPEED SIG

• Malfunction is detected in engine 

speed signal that is output from ECM 
through CAN communication.

• Improper signal is input while driving.

DLN-54

TRANSFER CONTROL UNIT

DLN-55

< ECU DIAGNOSIS >

[TRANSFER: TX15B]

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ECU DIAGNOSIS

TRANSFER CONTROL UNIT

Reference Value

INFOID:0000000005275458

VALUE ON THE DIAGNOSIS TOOL

CONSULT-III 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

DLN-56

< ECU DIAGNOSIS >

[TRANSFER: TX15B]

TRANSFER CONTROL UNIT

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