2009 INFINITI QX56 Factory Service Manual

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Page 1105 of 4171

INFINITI QX56 2009 Factory Service Manual
P1819 TRANSFER CONTROL DEVICEDLN-49
< COMPONENT DIAGNOSIS > [ATX14B]
C
EF
G H
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J
K L
M A
B
DLN
N
O P
4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between transfer control unit

P1819 TRANSFER CONTROL DEVICEDLN-49
< COMPONENT DIAGNOSIS > [ATX14B]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between transfer control unit harness connector terminals and ground.
Are the inspection results normal?
YES >> GO TO 2.
NO >> Check the following. If any items are damaged, repair or replace damaged parts. 10A fuse (No. 26 located in the fuse and fusible link box).
Harness for short or open between battery and transfer shut off relay harness connector E69
terminal 1.
Harness for short or open between transfer shut off relay harness connector E69 terminal 2 and
transfer control unit harness connector E143 terminal 30.
Harness for short or open between battery and transfer shut off relay harness connector E69 terminal 5.
Harness for short or open between transfer shut off relay harness connector E69 terminal 3 and transfer control unit harness connector E142 terminal 22.
Transfer shut off relay. Refer to DLN-23, "Component Inspection"
.
2.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector.
3. Check continuity between transfer control unit harness connec- tor E142 terminals 3, 6, E143 terminal 45 and ground.
Also check harness for short to ground and short to power.
Are the inspection results normal?
YES >> GO TO 3.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove transfer shift high relay and transfer shift low relay. Refer to DLN-16, "Component Parts Loca-
tion".
3. 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.
Connector Terminal Voltage (Approx.)
E142 16 - Ground
Battery voltage
22 - Ground
E143 30 - Ground 0V
SDIA2835E
Continuity should exist.
SDIA2691E
Connector Terminal Voltage (Approx.) A: E46 5 - Ground Battery voltage
B: E47 5 - Ground
WDIA0310E
Revision: December 20092009 QX56

Page 1106 of 4171

INFINITI QX56 2009 Factory Service Manual
DLN-50
< COMPONENT DIAGNOSIS >[ATX14B]
P1819 TRANSFER CONTROL DEVICE
4. Turn ignition switch ON. (Do not start engine.)
5. Check voltage between transfer shift high relay harness connec-
tor E46 term

DLN-50
< COMPONENT DIAGNOSIS >[ATX14B]
P1819 TRANSFER CONTROL DEVICE
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 CONT ROL 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 fo r 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
Revision: December 20092009 QX56

Page 1107 of 4171

INFINITI QX56 2009 Factory Service Manual
P1819 TRANSFER CONTROL DEVICEDLN-51
< COMPONENT DIAGNOSIS > [ATX14B]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
7.PERFORM SELF-DIAGNOSIS (WITH CONSULT-III)
With CONSULT-III
1. Turn ignition switch ON. (Do no

Page 1108 of 4171

INFINITI QX56 2009 Factory Service Manual
DLN-52
< COMPONENT DIAGNOSIS >[ATX14B]
P1820 ENGINE SPEED SIGNAL
P1820 ENGINE SPEED SIGNAL
DescriptionINFOID:0000000003772119
The ECM transmits the engine speed signal via CAN comm
unication to the t

Page 1109 of 4171

INFINITI QX56 2009 Factory Service Manual
P1822 CLUTCH PRESSURE SOLENOIDDLN-53
< COMPONENT DIAGNOSIS > [ATX14B]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
P1822 CLUTCH PRESSURE SOLENOID
DescriptionINFOID:0000000003772122
Proper voltage is not applied

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INFINITI QX56 2009 Factory Service Manual
DLN-54
< COMPONENT DIAGNOSIS >[ATX14B]
P1822 CLUTCH PR
ESSURE SOLENOID
Are the inspection results normal?
YES >> GO TO 7.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN TRANSFER CONT ROL UNIT AND CLUTCH PRE

Page 1111 of 4171

INFINITI QX56 2009 Factory Service Manual
P1822 CLUTCH PRESSURE SOLENOIDDLN-55
< COMPONENT DIAGNOSIS > [ATX14B]
C
EF
G H
I
J
K L
M A
B
DLN
N
O P
3. Check continuity between transfer terminal cord assembly har- ness connector F56 terminal 19

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INFINITI QX56 2009 Factory Service Manual
DLN-56
< COMPONENT DIAGNOSIS >[ATX14B]
P1822 CLUTCH PR
ESSURE SOLENOID
2. Disconnect transfer terminal cord assembly harness connector.
3. Check resistance between transfer terminal cord assembly ter

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