Infiniti QX56 (JA60). Manual — part 287
P1827 CLUTCH PRESSURE SWITCH
DLN-71
< COMPONENT DIAGNOSIS >
[ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
P1827 CLUTCH PRESSURE SWITCH
Description
INFOID:0000000005148833
Improper signal from the clutch pressure switch is input due to open or short circuit. Also, a malfunction may
have occured in clutch pressure switch or hydraulic circuit.
DTC Logic
INFOID:0000000005148834
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1827 displayed?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148835
Regarding Wiring Diagram information, refer to
DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"
.
1.
CHECK CLUTCH PRESSURE SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out ON/OFF switching action of the CL PRES SW while operating 4WD shift switch.
Without CONSULT-III
1. Start engine.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1827]
CLUTCH PRES SW
• Improper signal from clutch pressure
switch is input due to open or short cir-
cuit.
• Malfunction occurs in clutch pressure
switch or hydraulic circuit.
Condition
Display value
• Ignition switch: ON
• A/T selector lever D posi-
tion
4WD shift switch: AUTO or 4H (Wait
function is not operating.)
ON
Ignition switch: ON
4WD shift switch: 2WD (Wait func-
tion is not operating.)
OFF
DLN-72
< COMPONENT DIAGNOSIS >
[ATX14B]
P1827 CLUTCH PRESSURE SWITCH
2. Check voltage between transfer control unit harness connector
terminals and ground.
Are inspection results normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND CLUTCH PRESSURE SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the transfer terminal cord assembly harness con-
nector.
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 34 and transfer terminal cord assembly har-
ness connector F56 terminal 7
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 TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to
Are inspection results normal?
YES
>> GO TO 4.
NO
>> Check transfer control unit pin terminals for damage or loose connection with the harness connec-
tor. If any items are damaged, repair or replace damaged parts.
4.
CHECK CLUTCH PRESSURE SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove clutch pressure switch. Refer to
DLN-16, "Component Parts Location"
3. Push and release clutch pressure switch and check continuity
between terminal 7 and ground.
Are inspection results normal?
YES
>> GO TO 5.
NO
>> Replace clutch pressure switch.
5.
CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
Are inspection results normal?
Connector
Terminal
Condition
Voltage
(Approx.)
E143
34 -
Ground
• Ignition switch: ON
• A/T selector lever D
position
4WD shift switch:
AUTO or 4H (Wait
function is not op-
erating.)
0V
Ignition switch: ON
4WD shift switch:
2WD (Wait function
is not operating.)
Battery
voltage
SDIA2746E
Continuity should exist.
SDIA2747E
Terminal
Condition
Continuity
7 -
Ground
Push clutch pressure switch
Yes
Release clutch pressure switch
No
WDIA0171E
P1827 CLUTCH PRESSURE SWITCH
DLN-73
< COMPONENT DIAGNOSIS >
[ATX14B]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
YES
>> GO TO 6.
NO
>> Replace transfer control unit. Refer to
DLN-130, "Removal and Installation"
6.
CRUISE TEST
Perform cruise test. Refer to
.
Are inspection results normal?
YES
>> Inspection End.
NO
>> Perform the applicable trouble diagnosis.
Component Inspection
INFOID:0000000005148836
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Remove clutch pressure switch. Refer to
DLN-16, "Component Parts Location"
3. Push and release clutch pressure switch and check continuity
between terminal 7 and ground.
4. If the inspection results are abnormal replace the clutch pres-
sure switch.
Terminal
Condition
Continuity
7 - Ground
Push clutch pressure switch
Yes
Release clutch pressure switch
No
WDIA0171E
DLN-74
< COMPONENT DIAGNOSIS >
[ATX14B]
P1828 LINE PRESSURE SWITCH
P1828 LINE PRESSURE SWITCH
Description
INFOID:0000000005148837
Improper signal from line pressure switch is input due to open or short circuit. Also, a malfunction may have
occured in the line pressure switch or hydraulic circuit.
DTC Logic
INFOID:0000000005148838
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1828 displayed?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148839
Regarding Wiring Diagram information, refer to
DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"
.
1.
CHECK LINE PRESSURE SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out ON/OFF switching action of LINE PRES SW while operating 4WD shift switch.
Without CONSULT-III
1. Start engine.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1828]
LINE PRES SW
• Improper signal from line pressure
switch is input due to open or short cir-
cuit.
• Malfunction occurs in line pressure
switch or hydraulic circuit.
Refer to
.
Condition
Display value
• A/T selector lever D position
• 4WD shift switch: AUTO
ON
• Except the above
• The vehicle has been left
at room temperature for 5
minutes and more with ig-
nition switch in OFF posi-
tion.
• Ignition switch: ON
• A/T selector lever: P or N position
• 4WD shift switch: other than
AUTO
OFF
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