Infiniti QX56 (JA60). Manual - part 282

P1819 TRANSFER CONTROL DEVICE

DLN-51

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[ATX14B]

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

5. Check voltage between transfer shift high relay harness connec-

tor E46 terminal 5 (A), transfer shift low relay harness connector

E47 terminal 5 (B) 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.

• 20A fuse (No. 57 located in the fuse and relay box).

• Harness for short or open between battery, transfer shift high relay harness connector E46 ter-

minal 5 and transfer shift low relay harness connector E47 terminal 5.

4.

CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY

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

2. Disconnect transfer control unit harness connector and transfer control device (actuator motor) harness

connector.

3. Remove transfer shift high relay and transfer shift low relay.

4. Check continuity between the following terminals.

-

Transfer control unit harness connector E143 (A) terminal 33

and transfer shift high relay harness connector E46 (B) terminal

3.

-

Transfer control unit harness connector E143 (A) terminal 42

and transfer shift low relay harness connector E47 (C) terminal

3.

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 TRANSFER SHIFT RELAY GROUND CIRCUIT

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

2. Remove transfer shift high relay and transfer shift low relay.

3. Check continuity between transfer shift high relay harness con-

nector E46 (A) terminals 2, 4, transfer shift low relay harness

connector E47 (B) terminals 2, 4 and ground.

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

Are the inspection results normal?

YES

>> GO TO 6.

NO

>> Repair open circuit or short to ground or short to power

in harness or connectors.

6.

CHECK TRANSFER CONTROL UNIT

Check transfer control unit input/output signal. Refer to 

DLN-81, "Reference Value"

.

Are the inspection results normal?

YES-1 >> With CONSULT-III: GO TO 7.

YES-2 >> Without CONSULT-III: 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.

Connector

Terminal

Voltage (Approx.)

A: E46

5 - Ground

Battery voltage

B: E47

5 - Ground

WDIA0311E

Continuity should exist.

WDIA0315E

Continuity should exist.

WDIA0312E

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[ATX14B]

P1819 TRANSFER CONTROL DEVICE

7.

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-130, "Removal and Installation"

.

NO

>> Inspection End.

8.

PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT-III)

Without CONSULT-III

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

DLN-18, "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.

NO

>> Inspection End.

P1820 ENGINE SPEED SIGNAL

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P1820 ENGINE SPEED SIGNAL

Description

INFOID:0000000005148814

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:0000000005148815

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-53, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148816

1.

CHECK DTC WITH ECM

Perform self-diagnosis with ECM. Refer to 

EC-63, "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-81, "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 the vehicle and then perform self-diagnosis.
Are the inspection results normal?

YES

>> Inspection End.

NO

>> Perform self-diagnosis with ECM again.

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.

Refer to 

DLN-53

.

DLN-54

< COMPONENT DIAGNOSIS >

[ATX14B]

P1822 CLUTCH PRESSURE SOLENOID

P1822 CLUTCH PRESSURE SOLENOID

Description

INFOID:0000000005148817

Proper voltage is not applied to the clutch pressure solenoid valve due to open or short circuit.

DTC Logic

INFOID:0000000005148818

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Perform self-diagnosis.
Is DTC P1822 displayed?

YES

>> Perform diagnosis procedure. Refer to 

DLN-54, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000005148819

Regarding Wiring Diagram information, refer to 

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

.

1.

CHECK CLUTCH PRESSURE 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 DUTY SOLENOID.

Without CONSULT-III

1. Start engine.

2. Check voltage between transfer control unit harness connector

terminal and ground.

DTC

CONSULT-III

Diagnostic item is detected when...

Reference

[P1822]

DUTY SOLENOID

Proper voltage is not applied to clutch 
pressure solenoid valve due to open or 
short circuit.

Refer to 

DLN-54

.

Condition

Display value

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

4WD shift switch: 2WD

4%

4WD shift switch: AUTO

96 - 4%

4WD shift switch: 4H or 
4LO

4%

SDIA2719E