Nissan Pathfinder. Manual - part 401

DLN-46

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY21C]

C1203 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

C1203 ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

DTC Logic

INFOID:0000000009177733

DTC DETECTION LOGIC

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.

PERFORM DTC CONFIRMATION

 With CONSULT

1. Start the engine and 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 

DLN-46, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009177734

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-42, "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

Display item

Malfunction detected condition

Possible cause

C1203

ABS SYSTEM

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

ABS malfunction
• Vehicle speed signal error

C1204 4WD SOLENOID

DLN-47

< DTC/CIRCUIT DIAGNOSIS >

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C1204 4WD SOLENOID

DTC Logic

INFOID:0000000009177735

DTC DETECTION LOGIC

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.

PERFORM DTC CONFIRMATION

 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 

DLN-47, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009177736

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?

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 (#62)

DTC

Display item

Malfunction detected condition

Possible cause

C1204

4WD SOLENOID

Malfunction related to 4WD solenoid has 
been detected.

• Internal malfunction of electronic con-

trolled coupling

• Malfunction of 4WD solenoid power 

supply circuit (open or short)

• Malfunction of 4WD solenoid com-

mand current

4WD control unit

—

Voltage

Connector

Terminal

B67

9

Ground

Battery voltage

4WD control unit

—

Voltage

Connector

Terminal

B67

9

Ground

Battery voltage

DLN-48

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY21C]

C1204 4WD SOLENOID

3. Check the harness for open or short between 4WD control unit harness connector No.9 terminal and 10A

fuse (#62).

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.

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-49, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

DLN-121,

"Removal and Installation"

.

4WD control unit

—

Continuity

Connector

Terminal

B67

10

Ground

Existed

11

4WD control unit

 Resistance (Approx.)

Connector

Terminal

B67

1

2

2.45 

Ω

4WD control unit

4WD solenoid

Continuity

Connector

Terminal

Connector

Terminal

B67

1

C12

1

Existed

2

2

4WD control unit

—

Continuity

Connector

Terminal

B67

1

Ground

Not existed

2

C1204 4WD SOLENOID

DLN-49

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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:0000000009177737

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-121,

"Removal and Installation"

.

4WD solenoid

 Resistance (Approx.)

Terminal

1

2

2.45 

Ω