Infiniti QX56 (Z62). Manual — part 466
DLN-64
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
Description
INFOID:0000000006222260
Supplies power to transfer control unit.
DTC Logic
INFOID:0000000006222261
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch OFF to ON.
2.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “P1811” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222262
1.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
1.
Turn the ignition switch OFF.
2.
Disconnect transfer control unit harness connector.
3.
Check the voltage between transfer control unit harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
1.
Turn the ignition switch OFF.
2.
Check the 10A fuse (#34).
3.
Check the harness for open or short between transfer control unit harness connector No.20 terminal and
10A (#34).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit. Refer to
NO
>> Repair or replace error-detected parts.
DTC
Display item
Malfunction detected condition
Possible cause
P1811
BATTERY VOLTAGE
When transfer control unit power supply
is lower or higher than normal
Malfunction of transfer control unit pow-
er supply circuit (open or short)
Transfer control unit
—
Voltage
Connector
Terminal
E59
20
Ground
Battery voltage
Transfer control unit
—
Voltage
Connector
Terminal
E59
20
Ground
Battery voltage
P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
DLN-65
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
3.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
1.
Turn the ignition switch OFF.
2.
Check the voltage between transfer control unit harness connector and ground.
3.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
4.
Check the voltage between transfer control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
1.
Turn the ignition switch OFF.
2.
Check the 10A fuse (#56).
3.
Disconnect IPDM E/R harness connector.
4.
Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
5.
Check the continuity between transfer control unit harness connector and the ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for ignition power supply circuit. Refer to
NO
>> Repair or replace error-detected parts.
5.
CHECK TRANSFER CONTROL UNIT GROUND
1.
Turn the ignition switch OFF.
2.
Check the continuity between transfer control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK TERMINALS AND HARNESS CONNECTORS
Transfer control unit
—
Voltage
Connector
Terminal
E59
32
Ground
0 V
Transfer control unit
—
Voltage
Connector
Terminal
E59
32
Ground
Battery voltage
IPDM E/R
Transfer control unit
Continuity
Connector
Terminal
Connector
Terminal
E15
58
E59
32
Existed
Transfer control unit
—
Continuity
Connector
Terminal
E59
32
Ground
Not existed
Transfer control unit
—
Continuity
Connector
Terminal
E60
46
Ground
Existed
44
DLN-66
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
P1811 POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT
Check the transfer control unit pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> Replace transfer control unit. Refer to
DLN-107, "Removal and Installation"
.
NO
>> Repair or replace error-detected parts.
P1813 4WD MODE SWITCH
DLN-67
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: ATX90A]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
P1813 4WD MODE SWITCH
DTC Logic
INFOID:0000000006222263
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC REPRODUCTION PROCEDURE
With CONSULT-III
1.
Turn the ignition switch OFF to ON.
2.
Turn the 4WD shift switch AUTO
⇒
4H
⇒
4LO
⇒
4H
⇒
AUTO.
3.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “P1813” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006222264
1.
CHECK TRANSFER SHIFT SWITCH
Check 4WD switch assembly. Refer to
DLN-68, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> 4WD shift switch is malfunctioning. Replace 4WD switch assembly. Refer to
.
2.
CHECK 4WD SHIFT SWITCH CIRCUIT (1)
1.
Disconnect transfer control unit harness connector.
2.
Check the continuity between transfer control unit harness connector and 4WD switch assembly harness
connector.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace error-detected parts.
DTC
Display item
Malfunction detected condition
Possible cause
P1813
4WD MODE SW
Multiple signals received from 4WD shift
switch are detected.
• 4WD switch assembly
- Internal malfunction of 4WD switch
assembly
- Malfunction of 4WD switch assembly
circuit
• Transfer control unit
Transfer control unit
4WD switch assembly
Continuity
Connector
Terminal
Connector
Terminal
E59
11
M54
11
Existed
10
Not existed
9
Not existed
35
11
Not existed
10
Existed
9
Not existed
14
11
Not existed
10
Not existed
9
Existed
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