Infiniti QX56 (JA60). Manual — part 278
P1813 4WD SHIFT SWITCH
DLN-35
< COMPONENT DIAGNOSIS >
[ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
4. If the inspection results are abnormal replace the 4WD shift switch.
1 - 4
4WD shift switch: 2WD
No
4WD shift switch: AUTO, 4H and
4LO
Yes
1 - 5
4WD shift switch: 4H
Yes
4WD shift switch: 2WD, AUTO,
and 4LO
No
1 - 6
4WD shift switch: 4LO
Yes
4WD shift switch: 2WD, AUTO and
4H
No
Terminal
Condition
Continuity
DLN-36
< COMPONENT DIAGNOSIS >
[ATX14B]
P1814 WAIT DETECTION SWITCH
P1814 WAIT DETECTION SWITCH
Description
INFOID:0000000005148796
The wait detection switch detects if the transfer case is in 4WD. DTC P1814 will set if an improper signal from
the wait detection switch is input due to open or short circuit.
DTC Logic
INFOID:0000000005148797
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1814 detected?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148798
Regarding Wiring Diagram information, refer to
DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"
.
1.
CHECK WAIT DETECTION SWITCH 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 WAIT DETCT SW.
Without CONSULT-III
1. Start engine.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1814]
4WD DETECT SWITCH
Improper signal from wait detection
switch is input due to open or short cir-
cuit.
Refer to
.
Condition
Display value
• Vehicle stopped
• Engine running
• A/T selector lever N position
• Brake pedal depressed
4WD shift switch: 2WD, AUTO
or 4H
OFF
4WD shift switch: 4H to 4LO
(While actuator motor is operat-
ing.)
OFF
→ ON
4WD shift switch: 4LO to 4H
(While actuator motor is operat-
ing.)
ON
→ OFF
4WD shift switch: 4LO
ON
P1814 WAIT DETECTION SWITCH
DLN-37
< COMPONENT DIAGNOSIS >
[ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
2. Check voltage between transfer control unit harness connector
terminal and ground.
Are inspection results normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN TRANSFER CONTROL 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
SDIA2701E
Continuity should exist.
SDIA2702E
Continuity should exist.
SDIA2703E
DLN-38
< COMPONENT DIAGNOSIS >
[ATX14B]
P1814 WAIT DETECTION SWITCH
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
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 Inspection
INFOID:0000000005148799
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
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