Nissan Titan. Manual - part 113

DLN-24

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1802 – P1804, P1809 TRANSFER CONTROL UNIT

2. Perform the self-diagnosis again.
Do the self-diagnostic results indicate AD converter?

YES

>> Replace transfer control unit. Refer to 

DLN-91, "Removal and Installation"

.

NO

>> Inspection End.

P1807 VEHICLE SPEED SENSOR (A/T)

DLN-25

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

P1807 VEHICLE SPEED SENSOR (A/T)

Description

INFOID:0000000009885964

The transmission control module (TCM) transmits the output shaft revolution signal via CAN communication to

Transfer control unit.  DTC P1807 or flash code 2 will set when a malfunction is detected in the output shaft

revolution signal or an improper signal is input while driving.

DTC Logic

INFOID:0000000009885965

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1807 or flash code 2 detected?

YES

>> Perform diagnosis procedure. Refer to 

DLN-25, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009885966

1.

CHECK DTC WITH TCM

Perform self-diagnosis with TCM. Refer to 

TM-38, "CONSULT Function (TRANSMISSION)"

.

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-56, "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

Drive vehicle and then perform Self-diagnosis.
Is DTC P1807 displayed?

YES

>> Perform self-diagnosis with TCM again.

NO

>> Inspection End.

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1807]

VHCL SPEED SEN·AT

• Malfunction is detected in output shaft 

revolution signalthat is output from 
TCM through CAN communication.

• Improper signal is input while driving.

DLN-25, "Diagnosis Procedure"

DLN-26

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

P1808 VEHICLE SPEED SENSOR (ABS)

P1808 VEHICLE SPEED SENSOR (ABS)

Description

INFOID:0000000009885967

The ABS actuator and electric unit (control unit) transmits a vehicle speed signal via CAN communication to

the transfer control unit.  DTC P1808 or flash code 3 sets when a malfunction is detected in the vehicle speed

signal that is output from the ABS actuator and electric unit (control unit) or an improper signal is input while

driving.

DTC Logic

INFOID:0000000009885968

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1808 or flash code 3 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-26, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009885969

1.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to 

BRC-24, "CONSULT Func-

tion (ABS)"

.

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-56, "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

Drive vehicle and then perform Self-diagnosis.
Is DTC P1808 displayed?

YES

>> Perform self-diagnosis with ABS actuator and electric unit (control unit).

NO

>> Inspection End.

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1808]

VHCL SPEED SEN·ABS

• Malfunction is detected in vehicle 

speed signal that is output from ABS 
actuator and electric unit (control unit) 
through CAN communication.

• Improper signal is input while driving.

DLN-26, "Diagnosis Procedure"

P1810 4 LO SWITCH

DLN-27

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TX15B]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

P1810 4 LO SWITCH

Description

INFOID:0000000009885970

The 4LO switch detects that the transfer case is in 4LO range.  DTC P1810 or flash code 6 will set when an

improper signal from the 4LO switch is input due to an open or short circuit.

DTC Logic

INFOID:0000000009885971

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1810 or flash code 6 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-27, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009885972

Regarding Wiring Diagram information, refer to 

DLN-62, "Wiring Diagram"

.

1.

CHECK 4LO POSITION SWITCH SIGNAL

With CONSULT

1. Start engine.

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

3. Read out the value of 4L POSI SW.

Without CONSULT

1. Start engine.

2. Check voltage between transfer control unit harness connector

terminal and ground.

OK or NG

DTC

CONSULT

Diagnostic item is detected when...

Reference

[P1810]

4L POSI SW TF

Improper signal from 4LO switch is input 
due to open or short circuit.

DLN-27, "Diagnosis Procedure"

Condition

Display value

• Vehicle stopped
• Engine running
• A/T selector lever N position
• Brake pedal depressed

4WD shift switch: 4LO

ON

Except the above

OFF

Connector

Terminal

Condition

Voltage 

(Approx.)

E142

 24 - 

Ground

• Vehicle stopped
• Engine running
• A/T selector lever 

N position

• Brake pedal de-

pressed

4WD shift switch: 4LO

0V

Except the above

Battery 
voltage

SDIA3363E