Infiniti QX56 (JA60). Manual — part 281
P1818 ACTUATOR POSITION SWITCH
DLN-47
< COMPONENT DIAGNOSIS >
[ATX14B]
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DLN
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2. Check voltage between transfer control unit harness connector
terminal and ground.
Are the inspection results normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND ACTUATOR POSITION SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer control device (actuator position
switch) harness connector.
3. Check continuity between the following terminals.
-
Transfer control unit harness connector E143 terminal 27 and
transfer control device (actuator position switch) harness con-
nector F58 terminal 23.
-
Transfer control unit harness connector E143 terminal 44 and
transfer control device (actuator position switch) harness con-
nector F58 terminal 20.
Also check harness for short to ground and short to power.
Are the 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 transfer control device (actuator position switch) harness connector.
3. Check continuity between transfer control device (actuator posi-
tion switch) harness connector F58 terminal 22 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 ACTUATOR POSITION SWITCH
1. Remove transfer control device. Refer to
DLN-136, "Removal and Installation"
Connector
Terminal
Condition
Voltage
(Approx.)
E143
27 -
Ground
• Vehicle stopped
• Engine running
• A/T selector le-
ver N position
• Brake pedal de-
pressed
4WD shift switch: 4H,
AUTO or 2WD
0V
4WD shift switch: 4LO
Battery
voltage
44 -
Ground
• Vehicle stopped
• Engine running
• A/T selector le-
ver N position
• Brake pedal de-
pressed
4WD shift switch: 4LO
0V
4WD shift switch:
2WD, AUTO or 4H
Battery
voltage
SDIA2715E
Continuity should exist.
SDIA2716E
Continuity should exist.
SDIA2717E
DLN-48
< COMPONENT DIAGNOSIS >
[ATX14B]
P1818 ACTUATOR POSITION SWITCH
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 position to HIGH when install-
ing.
• Be careful not to overheat the harness.
Are the inspection results normal?
YES
>> GO TO 5.
NO
>> Replace transfer control device (actuator motor).
5.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to
Are the 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
Perform the self-diagnosis, after driving a vehicle for a while.
Are the inspection results normal?
YES
>> Inspection End.
NO
>> Replace transfer control device.
Component Inspection
INFOID:0000000005148810
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 position to HIGH when install-
ing.
• Be careful not to overheat the harness.
3. If the inspection results are abnormal replace transfer control device (actuator motor).
Terminal
Continuity
Continuity
24 (Battery voltage) - 21
(Ground)
20 - 22
Yes
22 - 23
No
21 (Battery voltage) - 24
(Ground)
22 - 23
Yes
20 - 22
No
LDIA0101E
Terminal
Continuity
Continuity
24 (Battery voltage) - 21
(Ground)
20 - 22
Yes
22 - 23
No
21 (Battery voltage) - 24
(Ground)
22 - 23
Yes
20 - 22
No
LDIA0101E
P1819 TRANSFER CONTROL DEVICE
DLN-49
< COMPONENT DIAGNOSIS >
[ATX14B]
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DLN
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P1819 TRANSFER CONTROL DEVICE
Description
INFOID:0000000005148811
The transfer control device integrates the actuator motor and actuator position switch. DTC P1819 will set if
either of the following conditions exist:
• Malfunction occurs in transfer control device actuator circuit.
• Malfunction is detected in the transfer shut off relay.
DTC Logic
INFOID:0000000005148812
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1819 detected?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148813
Regarding Wiring Diagram information, refer to
DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"
.
1.
CHECK POWER SUPPLY
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Connect transfer control unit harness connector.
3. Check voltage between transfer control unit harness connector
terminal and ground.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1819]
SHIFT ACT CIR
• Transfer control device actuator circuit
is shorted or open. (Malfunctions are
detected when transfer shift relay cir-
cuit is open/shorted or relay monitor
circuit is open/shorted.)
• Malfunction occurs in transfer control
device drive circuit.
• Malfunction is detected in transfer
shut off relay.
Connector
Terminal
Voltage (Approx.)
E142
16 - Ground
0V
22 - Ground
E143
30 - Ground
Battery voltage
SDIA2834E
DLN-50
< COMPONENT DIAGNOSIS >
[ATX14B]
P1819 TRANSFER CONTROL DEVICE
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-
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
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