Infiniti QX56 (JA60). Manual - part 284

P1823 2-4 SOLENOID

DLN-59

< COMPONENT DIAGNOSIS >

[ATX14B]

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Without CONSULT-III

1. Start engine.

2. Check voltage between transfer control unit harness connector

terminal and ground.

Are the inspection results normal?

YES 

>> GO TO 7.

NO

>> GO TO 3.

3.

CHECK 4WD SHIFT SWITCH SIGNAL

1. Turn ignition switch ON. (Do not start engine.)

2. Check voltage between transfer control unit harness connector

terminals and ground.

Are the inspection results normal?

YES 

>> GO TO 4.

NO

>> Check 4WD shift switch. Refer to 

DLN-34, "Component Inspection"

.

4.

CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER TERMINAL CORD ASSEMBLY

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Disconnect 4WD shift switch harness connector and transfer terminal cord assembly harness connector.

2-4WD SOL 
MON

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

position

• Brake pedal de-

pressed

4WD shift switch: 2WD

OFF

4WD shift switch: AUTO

ON

4WD shift switch: 4H

4WD shift switch: 4LO

4WD shift switch: AUTO 
(Wait function is operating.)

OFF

4WD shift switch: 4H (Wait 
function is operating.)

OFF

Monitored 

item

Condition

Display 

value

Connector

Terminal

Condition

Voltage 

(Approx.)

E142

 1 - 

Ground

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

N position

• Brake pedal de-

pressed

4WD shift switch: 2WD 0V

4WD shift switch: AU-
TO, 4H or 4LO

Battery 
voltage

SDIA2728E

Connector

Terminal

Condition

Voltage (Ap-

prox.)

M141

4 - ground

4WD shift switch: AUTO, 4H or 4LO Battery voltage

4WD shift switch: 2WD

0V

SDIA2729E

DLN-60

< COMPONENT DIAGNOSIS >

[ATX14B]

P1823 2-4 SOLENOID

3. Check continuity between 4WD shift switch harness connector

M141 terminal 4 and transfer terminal cord assembly harness

connector F56 terminal 5.

Also check harness for short to ground and short to power.

Are the inspection results normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER TERMINAL CORD AS-

SEMBLY
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connec-

tor.

3. Check continuity between transfer control unit harness connec-

tor E142 terminal 1 and transfer terminal cord assembly harness

connector F56 terminal 4.

Also check harness for short to ground and short to power.

Are the inspection results normal?

YES

>> GO TO 6.

NO

>> Repair or replace damaged parts.

6.

CHECK 2-4WD SOLENOID

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)

2. Disconnect transfer terminal cord assembly harness connector.

3. Check resistance between transfer terminal cord assembly ter-

minals 4 and 5.

Are the inspection results normal?

YES

>> GO TO 7.

NO

>> Replace 2-4WD solenoid. Refer to 

DLN-16, "Compo-

nent Parts Location"

.

7.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are the inspection results normal?

YES

>> GO TO 8.

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.

8.

CHECK DTC

Perform the self-diagnosis, after driving a vehicle for a while.
Are the inspection results normal?

YES

>> Inspection End.

NO

>> Replace transfer control unit. Refer to 

DLN-130, "Removal and Installation"

.

Continuity should exist.

SDIA2731E

Continuity should exist.

SDIA2732E

4 - 5

: Approx. 22.8 - 25.2 

Ω

WDIA0187E

P1823 2-4 SOLENOID

DLN-61

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Component Inspection

INFOID:0000000005148824

1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly ter-

minals 4 and 5.

4. If the inspection results are abnormal replace the 2-4WD sole-

noid. Refer to 

DLN-16, "Component Parts Location"

.

4 - 5

: Approx. 22.8 - 25.2 

Ω

WDIA0187E

DLN-62

< COMPONENT DIAGNOSIS >

[ATX14B]

P1824 TRANSFER MOTOR

P1824 TRANSFER MOTOR

Description

INFOID:0000000005148825

Motor does not operate properly due to open or short circuit in transfer motor or transfer motor relay.

DTC Logic

INFOID:0000000005148826

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1824 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-62, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148827

Regarding Wiring Diagram information, refer to 

DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"

.

1.

CHECK TRANSFER MOTOR RELAY SIGNAL

With CONSULT-III

1. Start engine.

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

3. Read out the value of MOTOR RELAY and MOTOR RELAY MON.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1824]

MOTOR RELAY

Motor does not operate properly due to 
open or short circuit in transfer motor or 
transfer motor relay.

Refer to 

DLN-62

.

Monitored 

item

Condition

Display value

(Approx.)

MOTOR 
RELAY

• Accelerator ped-

al depressed

• Vehicle stopped
• Engine running
• Brake pedal de-

pressed

4WD shift switch: 2WD

OFF

4WD shift switch: AUTO or 
4LO (A/T selector lever P or N 
position)

OFF
(ON for approx. 
2 sec. after 
shifting to P and 
N.)

4WD shift switch: AUTO or 
4LO (Except for A/T selector 
lever P or N position)

ON

4WD shift switch: 4H (A/T se-
lector lever P position)

OFF
(ON for approx. 
2 sec. after 
shifting to P.)

4WD shift switch: 4H (Except 
for A/T selector lever P posi-
tion)

ON