200 INFINITI QX56 2009 Factory Service Manual

DLN-58
< COMPONENT DIAGNOSIS >[ATX14B]
P1823 2-4 SOLENOID

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-33, "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
Revision: December 20092009 QX56

P1823 2-4 SOLENOIDDLN-59
< COMPONENT DIAGNOSIS > [ATX14B]
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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 TRANSF ER CONTROL UNIT AND TRANSFER TERMINAL CORD AS-
SEMBLY
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit har ness 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
Revision: December 20092009 QX56

DLN-60
< COMPONENT DIAGNOSIS >[ATX14B]
P1823 2-4 SOLENOID
Component Inspection
INFOID:0000000003772129
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
Revision: December 20092009 QX56

P1824 TRANSFER MOTORDLN-61
< COMPONENT DIAGNOSIS > [ATX14B]
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P1824 TRANSFER MOTOR
DescriptionINFOID:0000000003772130
Motor does not operate properly due to open or short ci rcuit in transfer motor or transfer motor relay.
DTC LogicINFOID:0000000003772131
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-61, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003772132
1.CHECK TRANSFER MOTOR RELAY SIGNAL
With CONSULT-III1. 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-61
.
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
Revision: December 20092009 QX56

DLN-62
< COMPONENT DIAGNOSIS >[ATX14B]
P1824 TRANSFER MOTOR

Without CONSULT-III
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminal and ground.
MOTOR
RELAY
MON  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
Monitored
item Condition Display value
(Approx.)
Connector Terminal Condition Voltage (Approx.)
E142 14 -
Ground  Accelera-
tor pedal
depressed
 Vehicle
stopped
Engine running
Brake pedal de-
pressed 4WD shift switch:
2WD
Battery voltage
4WD shift switch:
AUTO or 4LO (A/T
selector lever P or N
position) Battery voltage
(0V for approx. 2
sec. after shifting
to P and N.)
4WD shift switch:
AUTO or 4LO (Ex-
cept for A/T selector
lever P or N position) 0V
4WD shift switch: 4H
(A/T selector lever P
position) Battery voltage
(0V for approx. 2
sec. after shifting
to P.)
4WD shift switch: 4H
(Except for A/T se-
lector lever P posi-
tion) 0V
SDIA2735E
Revision: December 20092009 QX56

P1824 TRANSFER MOTORDLN-63
< COMPONENT DIAGNOSIS > [ATX14B]
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Are the inspection results normal?
YES >> GO TO 7.
NO >> GO TO 2.
2.CHECK TRANSFER MOTOR RELAY POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Connect transfer control unit harness connector.
3. Disconnect transfer motor relay.
4. Check voltage between transfer motor relay harness connector terminals and ground.
5. Turn ignition switch ON. (Do not start engine.)
6. Check voltage between transfer motor relay harness connector terminals and ground.
Are the inspection results normal?
YES >> GO TO 3.
NO >> Check the following. If any items are damaged, repair or replace damaged parts.
 20A fuse (No. 58 located in the fuse and relay box).
 10A fuse (No. 26 located in the fuse and fusible link box).
 Harness for short or open between battery and transfer motor relay harness connector E154 ter- minal 5.
 Harness for short or open between transfer shut off relay harness connector E69 terminal 3 and transfer motor relay harness connector E153 terminal 2.
E143 41 -
Ground  Accelera-
tor pedal
depressed
Vehicle
stopped
Engine running
Brake pedal de-
pressed 4WD shift switch:
2WD
0V
4WD shift switch:
AUTO or 4LO (A/T
selector lever P or N
position) 0V
(Battery voltage
for approx. 2 sec.
after shifting to P
and N.)
4WD shift switch:
AUTO or 4LO (Ex-
cept for A/T selector
lever P or N position) Battery voltage
4WD shift switch: 4H
(A/T selector lever P
position) 0V
(Battery voltage
for approx. 2 sec.
after shifting to P.)
4WD shift switch: 4H
(Except for A/T se-
lector lever P posi-
tion) Battery voltage
Connector Terminal Condition Voltage (Approx.)
Connector Terminal Voltage (Approx.)
E153 2 - Ground 0V
E154 5 - Ground Battery voltage
WDIA0169E
Connector Terminal Voltage (Approx.)E153 2 - Ground Battery voltage
E154 5 - Ground
WDIA0170E
Revision: December 20092009 QX56

DLN-64
< COMPONENT DIAGNOSIS >[ATX14B]
P1824 TRANSFER MOTOR
 Battery and ignition switch.
3.CHECK TRANSFER MOTOR RELAY
1. Turn ignition switch OFF.
2. Remove transfer motor relay. Refer to DLN-16, "Component Parts Location"
.
3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
4. Check continuity between relay terminals 3 and 5.
Are the inspection results normal?
YES >> GO TO 4.
NO >> Replace the transfer motor relay.
4.CHECK TRANSFER MOTOR CONTROL CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove transfer motor relay.
3. Disconnect transfer control unit harness connector and transfer motor.
4. Check continuity between the following terminals.
- Transfer control unit harness connector E142 terminal 14 and transfer motor relay harness connector E153 terminal 1.
- Transfer control unit harness connector E143 terminal 41 and transfer motor relay harness connector E154 terminal 3.
- Transfer control unit harness connector E143 terminal 41 and
transfer motor harness connector F57 terminal 14.
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 MOTOR GROUND CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer motor harness connector.
Condition Continuity
12V direct current supply between terminals 1 and 2 Yes
OFF No
LDIA0098E
SDIA2738E
Continuity should exist.
WDIA0143E
Revision: December 20092009 QX56

P1824 TRANSFER MOTORDLN-65
< COMPONENT DIAGNOSIS > [ATX14B]
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3. Check continuity between transfer motor harness connector F57 terminal 15 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 MOTOR
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer motor harness connector.
3. Apply 12V direct current between transfer motor terminals 14 and 15.
Does transfer motor operate?
YES >> GO TO 7.
NO >> Replace transfer motor. Refer to DLN-140, "Removal
and Installation".
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"
.
Component InspectionINFOID:0000000003772133
TRANSFER MOTOR RELAY
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove transfer motor relay. Refer to DLN-16, "Component Parts Location"
.
3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
4. Check continuity between relay terminals 3 and 5.
5. If inspection results are abnormal replace transfer motor relay.
TRANSFER MOTOR
Continuity should exist.
SDIA2740E
LDIA0097E
Condition Continuity
12V direct current supply between terminals 1 and 2 Yes
OFF No
LDIA0098E
Revision: December 20092009 QX56

DLN-66
< COMPONENT DIAGNOSIS >[ATX14B]
P1824 TRANSFER MOTOR
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove transfer motor. Refer to
DLN-140, "Removal and Installation"
.
3. Apply 12V direct current between transfer motor terminals 14 and 15.
4. If transfer motor does not operate, replace transfer motor.
LDIA0097E
Revision: December 20092009 QX56

P1826 TRANSFER FLUID TEMPERATURE
DLN-67
< COMPONENT DIAGNOSIS > [ATX14B]
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P1826 TRANSFER FLUID TEMPERATURE
DescriptionINFOID:0000000003772134
Signal voltage from the transfer fluid temperature sens or is abnormally high (Transfer fluid temperature is
abnormally low) while driving.
DTC LogicINFOID:0000000003772135
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1826 displayed?
YES >> Perform diagnosis procedure. Refer to DLN-67, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003772136
1.CHECK TRANSFER FLUID TE MPERATURE SENSOR 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 FLUID TEMP SE.
Without CONSULT-III
1. Start engine.
2. Check voltage between transfer control unit harness connector
terminals and ground.
Are inspection results normal?
YES >> GO TO 4.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN TRANSF ER CONTROL UNIT AND TRANSFER TERMINAL CORD AS-
DTC CONSULT-III Diagnostic item is detected when... Reference
[P1826] OIL TEMP SEN Signal voltage from transfer fluid temper-
ature sensor is abnormally high (Trans-
fer fluid temperature is abnormally low)
while driving.Refer to
DLN-67
.
Condition Display value
(Approx.)
Transfer fluid temperature approx. 20 - 80 °C (68 - 176 °F) 1.1 - 0.3V
Connector Terminal Condition Data
(Approx.)
E143 28 -
Ground Always 0V
31 -
Ground Ignition switch:
ON Transfer fluid temperature
approx. 20
°C (68 °F) 1.1V
Transfer fluid temperature
approx. 80 °C (176 °F) 0.3V
SDIA2742E
Revision: December 20092009 QX56