Qashqai J11. Driveline - part 3

DIAGNOSIS AND REPAIR WORK FLOW

DLN-33

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Work Flow

INFOID:0000000010755247

DETAILED FLOW

1.

INTERVIEW FROM THE CUSTOMER

Clarify customer complaints before inspection. First of all, perform an interview utilizing 

DLN-34, "Diagnostic

Work Sheet"

 and reproduce symptoms as well as fully understand it. Ask customer about his/her complaints

carefully. Check symptoms by driving vehicle with customer, if necessary.

CAUTION:

Customers are not professional. Never guess easily like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.

>> GO TO 2.

2.

CHECK SYMPTOM

Reproduce the symptom that is indicated by the customer, based on the information from the customer
obtained by interview. Also check that the symptom is not caused by protection function. Refer to 

DLN-26,

"Protection Function"

.

CAUTION:

When the symptom is caused by normal operation, fully inspect each portion and obtain the under-
standing of customer that the symptom is not caused by a malfunction.

>> GO TO 3.

3.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is any DTC detected?

YES

>> Record or print self-diagnosis results. GO TO 4.

NO

>> GO TO 6.

4.

RECHECK SYMPTOM

With CONSULT

1.

Erase self-diagnostic results for “ALL MODE AWD/4WD”.

2.

Perform DTC confirmation procedures for the error detected system.

NOTE:
If some DTCs are detected at the same time, determine the order for performing the diagnosis based on 

DLN-

26, "DTC Inspection Priority Chart"

.

Is any DTC detected?

YES

>> GO TO 5.

NO

>> Check harness and connectors based on the information obtained by interview. Refer to 

GI-41,

"Intermittent Incident"

.

5.

REPAIR OR REPLACE ERROR-DETECTED PARTS

• Repair or replace error-detected parts.
• Reconnect part or connector after repairing or replacing.
• When DTC is detected, erase self-diagnostic results for “ALL MODE AWD/4WD”.

>> GO TO 7.

6.

IDENTIFY ERROR-DETECTED SYSTEM BY SYMPTOM DIAGNOSIS

Estimate error-detected system based on symptom diagnosis and perform inspection.
Can the error-detected system be identified?

DLN-34

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DIAGNOSIS AND REPAIR WORK FLOW

YES

>> GO TO 7.

NO

>> Check harness and connectors based on the information obtained by interview. Refer to 

GI-41,

"Intermittent Incident"

.

7.

FINAL CHECK

With CONSULT

1.

Check the reference value for 4WD control unit.

2.

Recheck the symptom and check that symptom is not reproduced on the same conditions.

Is the symptom reproduced?

YES

>> GO TO 3.

NO

>> INSPECTION END

Diagnostic Work Sheet

INFOID:0000000010755248

Description

• In general, customers have their own criteria for a problem. Therefore, it is important to understand the

symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the interview sheet referring to the interview points.

• In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.

Interview sheet sample

Interview sheet

Customer 
name

MR/MS

Registration 
number

Initial year 
registration 

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

Symptom

†

Vehicle does not enter 4WD mode.

†

4WD warning (4WD Error) is displayed.

†

Heavy tight-corner braking symptom occurs

†

Noise

†

Vibration

†

Others

(

)

First occurrence

†

Recently

†

Others (

)

Frequency of occurrence

†

Always

†

Under a certain conditions of

†

Sometimes (time(s)/day)

Climate con-
ditions

†

Irrelevant

Weather

†

Fine

†

Cloud

†

Rain

†

Snow

†

Others (

)

Temperature

†

Hot

†

Warm

†

Cool

†

Cold

†

Temperature (Approx.

°

C)

Relative humidity

†

High

†

Moderate

†

Low

Road conditions

†

Urban area

†

Suburb area

†

High way

†

Mounting road (uphill or down hill)

†

Rough road

Operation conditions, etc.

†

Irrelevant

†

When engine starts

†

During idling

†

During driving

†

During acceleration

†

At constant speed driving

†

During deceleration

†

During cornering (right curve or left curve)

DIAGNOSIS AND REPAIR WORK FLOW

DLN-35

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Other conditions

Memo

Interview sheet

Customer 
name

MR/MS

Registration 
number

Initial year 
registration 

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

DLN-36

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ADDITIONAL SERVICE WHEN REPLACING 4WD CONTROL UNIT

ADDITIONAL SERVICE WHEN REPLACING 4WD CONTROL UNIT

Description

INFOID:0000000010755249

When replacing 4WD control unit, unit characteristics writing is required.

Work Procedure

INFOID:0000000010755250

1.

PERFORM WRITING UNIT CHARACTERISTICS

Perform writing unit characteristics of electric controlled coupling.

>> Refer to 

DLN-37, "Work Procedure"

.

UNIT CHARACTERISTICS WRITING

DLN-37

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UNIT CHARACTERISTICS WRITING

Description

INFOID:0000000010755251

When replacing 4WD control unit, rear final drive assembly and/or electric controlled coupling, unit character-
istics of electric controlled coupling writing is required.

Work Procedure

INFOID:0000000010755252

1.

UNIT CHARACTERISTICS WRITING

 With CONSULT

1.

Confirm the unit characteristics of electric controlled coupling.
NOTE:
Unit characteristics is 12-digit alphanumeric.

2.

Turn the ignition switch OFF to ON.

3.

Select “UNIT CHARACTERISTICS WRITE” in “WORK SUP-
PORT” for “ALL MODE AWD/4WD”.

4.

Input unit characteristics.

5.

Select “Start”.

6.

Check that “UNIT CHARACTERISTICS WRITE COMPLETED”
is displayed.

>> WORK END

JSDIA5446ZZ

DLN-38

< DTC/CIRCUIT DIAGNOSIS >

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C1201 4WD CONTROL UNIT

DTC/CIRCUIT DIAGNOSIS

C1201 4WD CONTROL UNIT

DTC Description

INFOID:0000000010755253

DTC DETECTION LOGIC

POSSIBLE CAUSE

Internal malfunction of 4WD control unit

FAIL-SAFE

4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch OFF to ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1201” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-38, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755254

1.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1.

Erase self-diagnostic results for “ALL MODE AWD/4WD”.

2.

Turn the ignition switch OFF, and then wait 10 seconds or more.

3.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1201” detected?

YES

>> Replace 4WD control unit. Refer to 

DLN-72, "Removal and Installation"

.

NO

>> Check 4WD control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace error-detected parts.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

C1201

CONTROLLER FAILURE
(Control unit failure)

Malfunction has occurred inside 4WD control unit.

C1203 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

DLN-39

< DTC/CIRCUIT DIAGNOSIS >

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C1203 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

DTC Description

INFOID:0000000010755255

DTC DETECTION LOGIC

POSSIBLE CAUSE

ABS malfunction
• Vehicle speed signal error

FAIL-SAFE

4WD control changes to front-wheel drive gradually (rear-wheels still have some driving torque), then 4WD
control stops, and the vehicle becomes front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Drive at 30 km/h (19 MPH) or more for approximately 1 minute.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1203” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-39, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755256

1.

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

With CONSULT

Perform self-diagnosis for “ABS”.

Is any DTC detected?

YES

>> Check the DTC. Refer to 

BRC-53, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK TERMINALS AND HARNESS CONNECTORS

Check 4WD control unit pin terminals for damage or loose connection with harness connector.

Is inspection result normal?

YES

>> After turning the ignition switch OFF, perform DTC confirmation procedure again. If DTC “C1203”

is detected, Replace 4WD control unit. Refer to 

DLN-72, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

C1203

ABS SYSTEM
(ABS system)

Malfunction related to wheel sensor has been detected by 
ABS actuator and electric unit (control unit).

DLN-40

< DTC/CIRCUIT DIAGNOSIS >

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C1204 4WD SOLENOID

C1204 4WD SOLENOID

DTC Description

INFOID:0000000010755257

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Internal malfunction of electronic controlled coupling
• Malfunction of 4WD solenoid power supply circuit (open or short)
• Malfunction of 4WD solenoid command current

FAIL-SAFE

4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch OFF to ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1204” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-40, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755258

1.

CHECK 4WD SOLENOID POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Disconnect 4WD control unit harness connector.

3.

Check the voltage between 4WD control unit harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WD control unit harness connector and ground.

Is the inspection result normal?

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

C1204

4WD SOLENOID
(4WD solenoid)

Malfunction related to 4WD solenoid has been detected.

4WD control unit

—

Voltage

Connector

Terminal

B5

9

Ground

Battery voltage

4WD control unit

—

Voltage

Connector

Terminal

B5

9

Ground

Battery voltage

C1204 4WD SOLENOID

DLN-41

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YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK 4WD SOLENOID POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#6).

3.

Disconnect fuse block (J/B) harness connector.

4.

Check the continuity between 4WD control unit harness connector and fuse block (J/B) harness connec-
tor.

5.

Check the continuity between 4WD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

PG-11, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK 4WD SOLENOID GROUND

Check the continuity between 4WD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK 4WD SOLENOID CIRCUIT (1)

Check the resistance between 4WD control unit harness connector.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 5.

5.

CHECK 4WD SOLENOID CIRCUIT (2)

1.

Remove 4WD solenoid harness connector.

2.

Check the continuity between 4WD control unit harness connector and 4WD solenoid harness connector.

4WD control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

B5

9

M2

15B

Existed

4WD control unit

—

Continuity

Connector

Terminal

B5

9

Ground

Not existed

4WD control unit

—

Continuity

Connector

Terminal

B5

10

Ground

Existed

11

4WD control unit

 Resistance (Approx.)

Connector

Terminal

B5

1

2

2.5 

Ω

4WD control unit

4WD solenoid

Continuity

Connector

Terminal

Connector

Terminal

B5

1

C1

2

Existed

2

1

DLN-42

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C1204 4WD SOLENOID

3.

Check the continuity between 4WD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK 4WD SOLENOID

Check 4WD solenoid. Refer to 

DLN-12, "4WD Solenoid"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> 4WD solenoid is malfunctioning. Replace electric controlled coupling. Refer to 

DLN-76, "Removal

and Installation"

.

7.

CHECK TERMINALS AND HARNESS CONNECTORS

• Check 4WD control unit pin terminals for damage or loose connection with harness connector.
• Check 4WD solenoid pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES

>> Replace 4WD control unit. Refer to 

DLN-72, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

Component Inspection

INFOID:0000000010755259

1.

CHECK 4WD SOLENOID

1.

Turn the ignition switch OFF.

2.

Disconnect 4WD solenoid harness connector.

3.

Check the resistance between 4WD solenoid harness connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> 4WD solenoid is malfunctioning. Replace electric controlled coupling. Refer to 

DLN-76, "Exploded

View"

.

4WD control unit

—

Continuity

Connector

Terminal

B5

1

Ground

Not existed

2

4WD solenoid

 Resistance (Approx.)

Terminal

1

2

2.5 

Ω

C1209 MODE SW

DLN-43

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C1209 MODE SW

DTC Description

INFOID:0000000010755260

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Malfunction of 4WD mode switch
• Malfunction of 4WD mode switch circuit
• Internal malfunction of 4WD control unit

FAIL-SAFE

4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Start the engine.

CAUTION:

Stop the vehicle.

2.

Operate 4WD mode switch to each position.

3.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1209” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-43, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755261

1.

CHECK 4WD MODE SWITCH

Check 4WD mode switch. Refer to 

DLN-45, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace 4WD mode switch. Refer to 

DLN-73, "Removal and Installation"

.

2.

CHECK 4WD MODE SWITCH SIGNAL CIRCUIT

1.

Disconnect 4WD control unit harness connector.

2.

Check the continuity between 4WD control unit harness connector and 4WD mode switch harness con-
nector.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

C1209

MODE SW
(Mode switch)

More than two switch inputs are simultaneously detected 
due to short circuit of 4WD mode switch.

DLN-44

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY21C]

C1209 MODE SW

3.

Check the continuity between 4WD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK 4WD CONTROL SWITCH GROUND CIRCUIT

Check the continuity between 4WD mode switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK 4WD CONTROL UNIT OUTPUT SIGNAL

1.

Connect 4WD control unit harness connector.

2.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

3.

Check the voltage between 4WD mode switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK TERMINALS AND HARNESS CONNECTORS

4WD control unit

4WD mode switch

Continuity

Connector

Terminal

Connector

Terminal

B5

5

M8

3

Not existed

6

Existed

8

Not existed

12

3

Existed

6

Not existed

8

Not existed

14

3

Not existed

6

Not existed

8

Existed

4WD control unit

—

Continuity

Connector

Terminal

B5

5

Ground

Not existed

12

14

4WD mode switch

—

Continuity

Connector

Terminal

M8

2

Ground

Existed

4WD mode switch

—

Voltage

Connector

Terminal

M8

3

Ground

Battery voltage

6

8

C1209 MODE SW

DLN-45

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• Check 4WD control unit pin terminals for damage or loose connection with harness connector.
• Check 4WD mode switch pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> Replace 4WD control unit. Refer to 

DLN-72, "Removal and Installation"

.

NO

>> Repair or replace damaged parts.

Component Inspection

INFOID:0000000010755262

1.

CHECK 4WD MODE SWITCH

1.

Turn the ignition switch OFF.

2.

Remove 4WD mode switch.

3.

Check the continuity between 4WD mode switch connector terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace 4WD mode switch. Refer to 

DLN-73, "Removal and Installation"

.

4WD mode switch

Condition

Continuity

Terminal

3

2

4WD mode switch: 2WD

Existed

4WD mode switch: AUTO

Not existed

4WD mode switch: LOCK
 (State of hold of LOCK position)

6

2

4WD mode switch: 2WD

Not existed

4WD mode switch: AUTO

Existed

4WD mode switch: LOCK
 (State of hold of LOCK position)

8

2

4WD mode switch: 2WD

Not existed

4WD mode switch: AUTO

4WD mode switch: LOCK
 (State of hold of LOCK position)

Existed

DLN-46

< DTC/CIRCUIT DIAGNOSIS >

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C1210 ECM

C1210 ECM

DTC Description

INFOID:0000000010755263

DTC DETECTION LOGIC

POSSIBLE CAUSE

Malfunction of engine control system

FAIL-SAFE

4WD control changes to front-wheel drive gradually (rear-wheels still have some driving torque), then 4WD
control stops, and the vehicle becomes front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Drive the vehicle for a while.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “C1210” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-46, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755264

1.

PERFORM ECM SELF-DIAGNOSIS

With CONSULT

Perform self-diagnosis for “ENGINE”.

Is any DTC detected?

YES

>> Check the DTC. Refer to 

ECM-93, "DTC Index"

 (MR20DD).

NO

>> GO TO 2.

2.

CHECK TERMINALS AND HARNESS CONNECTORS

Check 4WD control unit pin terminals for damage or loose connection with harness connector.
Is inspection result normal?

YES

>> After turning the ignition switch OFF, perform DTC confirmation procedure again. If DTC “C1210”

is detected, Replace 4WD control unit. Refer to 

DLN-72, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

C1210

ENGINE SIGNAL 1
(Engine signal 1)

Malfunction related to engine signal has been detected.

P1804 4WD CONTROL UNIT

DLN-47

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY21C]

C

E

F

G

H

I

J

K

L

M

A

B

DLN

N

O

P

P1804 4WD CONTROL UNIT

DTC Description

INFOID:0000000010755265

DTC DETECTION LOGIC

POSSIBLE CAUSE

Internal malfunction of 4WD control unit.

FAIL-SAFE

4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P1804” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-47, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755266

1.

REPLACE 4WD CONTROL UNIT 

CAUTION:

Replace 4WD control unit when DTC “P1804” is detected simultaneously with other items.

>> Replace 4WD control unit. Refer 

DLN-72, "Removal and Installation"

.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1804

CONTROL UNIT
(Control unit)

Malfunction is detected in the memory (EEPROM) system of 
4WD control unit.

DLN-48

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY21C]

P1808 WHEEL SPEED SENSOR

P1808 WHEEL SPEED SENSOR

DTC Description

INFOID:0000000010755267

DTC DETECTION LOGIC

POSSIBLE CAUSE

• ABS malfunction
• Internal malfunction of 4WD control unit

FAIL-SAFE

4WD control changes to front-wheel drive gradually (rear-wheels still have some driving torque), then 4WD
control stops, and the vehicle becomes front-wheel drive.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P1808” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-48, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-41, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000010755268

1.

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

With CONSULT

Perform self-diagnosis for “ABS”.

Is any DTC detected?

YES

>> Check the DTC. Refer to 

BRC-53, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK TERMINALS AND HARNESS CONNECTORS

Check 4WD control unit pin terminals for damage or loose connection with harness connector.
Is inspection result normal?

YES

>> After turning the ignition switch OFF, perform DTC confirmation procedure again. If DTC “P1808”

is detected, Replace 4WD control unit. Refer to 

DLN-72, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1808

VHCL SPEED SEN-ABS
(Vehicle speed sensor-ABS)

• Malfunction is detected in vehicle speed signal that is out-

put from ABS actuator and electric unit (control unit) 
through CAN communication.

• Improper signal is input while driving.