2009 INFINITI QX56 200

DLN-36
< COMPONENT DIAGNOSIS >[ATX14B]
P1814 WAIT DETECTION SWITCH
Are inspection results normal?
YES >> GO TO 5.
NO >> GO TO 2.
2.CHECK HARNESS BETWEEN TRANSFER CONT
ROL UNIT AND WAIT DETECTION SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the wait detection switch harness connector.
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 43 and wait detection switch harness connec-
tor F59 terminal 10.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES >> GO TO 3.
NO >> Repair or replace damaged parts.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Check continuity between wait detection switch harness con- nector F59 terminal 11 and ground.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES >> GO TO 4.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK WAIT DETECTION SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Remove wait detection switch. Refer to DLN-16, "Component Parts Location"
.
Connector Terminal Condition Voltage
(Approx.)
E143 43 -
Ground  Vehicle stopped
 Engine running
 A/T selector lever
N position
 Brake pedal de- pressed 4WD shift switch:
2WD, AUTO or 4H
Battery
voltage
4WD shift switch: 4H to
4LO (While actuator
motor is operating.) Battery
voltage
→
0V
4WD shift switch: 4LO
to 4H (While actuator
motor is operating.) 0V
→
Battery
voltage
4WD shift switch: 4LO 0V
Continuity should exist.
SDIA2702E
Continuity should exist.
SDIA2703E
Revision: December 20092009 QX56

P1814 WAIT DETECTION SWITCHDLN-37
< COMPONENT DIAGNOSIS > [ATX14B]
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4. Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11.
Are inspection results normal?
YES >> GO TO 5.
NO >> Replace wait detection switch.
5.CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to DLN-81, "Reference Value"
.
Are inspection results normal?
YES >> GO TO 6.
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.
6.CHECK DTC
Drive the vehicle and then perform self-diagnosis.
Are inspection results normal?
YES >> Inspection End.
NO >> Replace transfer control unit. Refer to DLN-130, "Removal and Installation"
.
Component InspectionINFOID:0000000003772104
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect wait detection switch harness connector.
3. Remove wait detection switch. Refer to DLN-16, "Component Parts Location"
.
4. Push and release wait detection switch and check continuity between wait detection switch terminals 10 and 11.
5. If the inspection results are abnormal replace the wait detection switch.
Terminal Condition Continuity
10 - 11 Push wait detection switch Yes
Release wait detection switch No
SDIA2704E
Terminal Condition Continuity
10 - 11 Push wait detection switch Yes
Release wait detection switch No
SDIA2704E
Revision: December 20092009 QX56

DLN-38
< COMPONENT DIAGNOSIS >[ATX14B]
P1816 TRANSMISSION RANGE SWITCH
P1816 TRANSMISSION RANGE SWITCH
DescriptionINFOID:0000000003772105
The transmission range switch transmits the A/T positi
on indicator signal (transmission range switch signal)
via CAN communication to the transfer control unit. DTC P1816 will set when the transmission range switch
signal is malfunctioning or there is a communication error.
DTC LogicINFOID:0000000003772106
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1816 displayed?
YES >> Perform diagnosis procedure. Refer to DLN-38, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003772107
1.CHECK DTC WITH TCM
Perform self-diagnosis with TCM. Refer to TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Is any malfunction detec ted 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 inspection results normal?
YES >> GO TO 3.
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.
3.CHECK DTC
Drive the vehicle and then perform self-diagnosis.
Are inspection results normal?
YES >> Inspection End.
NO >> Perform self-diagnosis with TCM again.
DTC CONSULT-III Diagnostic item is detected when... Reference
[P1816] PNP SW/CIRC When transmission range switch signal
is malfunction or communication error
between the control units.Refer to
DLN-38
.
Revision: December 20092009 QX56

P1817 ACTUATOR MOTORDLN-39
< COMPONENT DIAGNOSIS > [ATX14B]
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P1817 ACTUATOR MOTOR
DescriptionINFOID:0000000003772108
The actuator motor receives signals from the transfer c ontrol unit and controls shift rods which shift the trans-
fer case. DTC P1817 will set when any of the following occur:
 Motor does not operate properly due to open or short circuit in actuator motor.
 Malfunction is detected in the actuator motor. (W hen 4WD shift switch is operated and actuator motor does
not operate)
 Malfunction is detected in transfer shift high relay or transfer shift low relay.
DTC LogicINFOID:0000000003772109
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1817 detected?
YES >> Perform diagnosis procedure. Refer to DLN-39, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000003772110
1.CHECK ACTUATOR MOTOR 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 SHIFT ACT1, SHIFT AC MON1, SHIFT ACT2 and SHIFT AC MON2.
DTC CONSULT-III Diagnostic item is detected when... Reference
[P1817] SHIFT ACTUATOR  Motor does not operate properly due
to open or short circuit in actuator mo-
tor.
 Malfunction is detected in the actuator motor. (When 4WD shift switch is op-
erated and actuator motor is not oper-
ated)
 Malfunction is detected in transfer shift
high relay and transfer shift low relay. Refer to
DLN-39
.
Monitored
item Condition Display
value
SHIFT ACT1  Vehicle stopped
 Engine running
 A/T selector lever N position
 Brake pedal depressed 4WD shift switch: 4H
to 4LO (Wait function
is operating.)
ON
Except the above OFF
SHIFT AC
MON1  Vehicle stopped
 Engine running
 A/T selector lever N position
 Brake pedal depressed 4WD shift switch: 4H
to 4LO (Wait function
is operating.)
ON
Except the above OFF
SHIFT ACT2  Vehicle stopped
 Engine running
 A/T selector lever N position
 Brake pedal depressed 4WD shift switch:
4LO to 4H (Wait func-
tion is operating.)
ON
Except the above OFF
Revision: December 20092009 QX56

DLN-40
< COMPONENT DIAGNOSIS >[ATX14B]
P1817 ACTUATOR MOTOR
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 2.
2.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.
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.
SHIFT AC
MON2  Vehicle stopped
 Engine running
 A/T selector lever N position
 Brake pedal depressed 4WD shift switch:
4LO to 4H (Wait func-
tion is operating.)
ON
Except the above OFF
Connector Terminal Condition Voltage
(Approx.)
E142 4 -
Ground  Vehicle stopped
 Engine running
 A/T selector lever
N position
 Brake pedal de-
pressed 4WD shift switch: 4H to
4LO (Wait function is
operating.)
Battery
voltage
Except the above 0V
13 -
Ground  Vehicle stopped
 Engine running
 A/T selector lever
N position
 Brake pedal de- pressed 4WD shift switch: 4LO
to 4H (Wait function is
operating.)
Battery
voltage
Except the above 0V
E143 33 -
Ground  Vehicle stopped
 Engine running
 A/T selector lever
N position
 Brake pedal de- pressed 4WD shift switch: 4H to
4LO (Wait function is
operating.)
Battery
voltage
Except the above 0V
42 -
Ground  Vehicle stopped
 Engine running
 A/T selector lever
N position
 Brake pedal de-
pressed 4WD shift switch: 4LO
to 4H (Wait function is
operating.)
Battery
voltage
Except the above 0V
Monitored
item Condition Display
value
SDIA2705E
Connector Terminal Voltage (Approx.)
A: E46 5 - Ground Battery voltage
B: E47 5 - Ground
WDIA0310E
Revision: December 20092009 QX56

P1817 ACTUATOR MOTORDLN-41
< COMPONENT DIAGNOSIS > [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 3.
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 terminal 5and transfer shift low relay harness connector terminal 5.
3.CHECK ACTUATOR MOTOR GROUND 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 continuity between transfer shift high relay harness con- nector E46 terminals 2, 4 (A) and transfer shift low relay harness
connector E47 terminals 2, 4 (B) and ground.
Also check harness for short to ground and short to power.
Are the inspection results normal?
YES >> GO TO 4.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
4.CHECK TRANSFER SHIFT RELAY
1. Turn ignition switch OFF.
2. Remove transfer shift high relay and transfer shift low relay. Refer to DLN-16, "Component Parts Loca-
tion".
3. Apply 12V direct current between transfer shift relay terminals 1
and 2.
4. Check continuity between relay terminals 3 and 4, 3 and 5.
Are the inspection results normal?
YES >> GO TO 5.
NO >> Replace the transfer shut off relay. Refer to DLN-16, "Component Parts Location"
.
5.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 the transfer control device (actuator motor) har-
ness connector.
3. Remove transfer shift high relay and transfer shift low relay.
4. Check continuity between the following terminals.
Connector Terminal Voltage (Approx.)
A: E46 5 - Ground Battery voltage
B: E47 5 - Ground
WDIA0311E
Continuity should exist.
WDIA0312E
Terminal Condition Continuity
3 - 4 12V direct current supply between terminals 1 and 2 No
OFF Yes
3 - 5 12V direct current supply between terminals 1 and 2 Yes
OFF No
WIIA0291E
Revision: December 20092009 QX56

DLN-42
< COMPONENT DIAGNOSIS >[ATX14B]
P1817 ACTUATOR MOTOR
- Transfer control unit harness connector E143 terminal 33 and
transfer control device (actuator motor) harness connector F58
terminal 21.
- Transfer control unit harness connector E143 terminal 42 and
transfer control device (actuator motor) harness connector F58
terminal 24.
- Transfer control unit harness connector E142 (A) terminal 4 and transfer shift high relay harness connector E46 (B) terminal 1.
- Transfer control unit harness connector E142 (A) terminal 13
and transfer shift low relay harness connector E47 (C) terminal
1.
- 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 6.
NO >> Repair or replace damaged parts.
6.CHECK ACTUATOR MOTOR
1. Remove transfer control device. Refer to DLN-136, "Removal and Installation"
.
2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21 and 24.
CAUTION:
 Do not operate actuator motor for more than 1 second.
 Change the actuator motor posi tion to HIGH when install-
ing.
 Be careful not to overheat the harness.
SDIA2710E
WDIA0314E
Continuity should exist.
WDIA0315E
Terminal Actuator motor
21 (Battery voltage) - 24 (Ground) Clockwise rotation
24 (Battery voltage) - 21 (G round) Counterclockwise rotation
WDIA0224E
Revision: December 20092009 QX56

P1817 ACTUATOR MOTORDLN-43
< COMPONENT DIAGNOSIS > [ATX14B]
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3. Check resistance between transfer control device (actuator motor) terminals 21 and 24.
Are the inspection results normal?
YES >> GO TO 7.
NO >> Replace transfer control device (actuator motor).
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:0000000003772111
TRANSFER SHIFT RELAY
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. Apply 12V direct current between transfer shift relay terminals 1 and 2.
4. Check continuity between relay terminals 3 and 4, 3 and 5.
5. If NG, replace transfer shift relay.
TRANSFER CONTROL DEVICE
1. Remove transfer control device. Refer to DLN-136, "Removal and Installation".
2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21 and 24.
CAUTION:
 Do not operate actuator moto r for more than 1 second.
 Change the actuator motor posi tion to HIGH when install-
ing.
 Be careful not to overheat the harness. 21 - 24 : Approx. 0.2
Ω
SDIA2726E
Terminal Condition Continuity
3 - 4 12V direct current supply between terminals 1 and 2 No
OFF Yes
3 - 5 12V direct current supply between terminals 1 and 2 Yes
OFF No
WIIA0291E
Terminal Actuator motor
21 (Battery voltage) - 24 (Ground) Clockwise rotate
24 (Battery voltage) - 21 (G round) Counterclockwise rotate
WDIA0224E
Revision: December 20092009 QX56