Nissan X-Trail 32. Manual — part 660
P1804 4WD CONTROL UNIT
DLN-51
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TY21C]
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P1804 4WD CONTROL UNIT
DTC Description
INFOID:0000000010991994
DTC DETECTION LOGIC
POSSIBLE CAUSE
Internal malfunction of 4WD control unit.
FAIL-SAFE
4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
DTC REPRODUCTION PROCEDURE
With CONSULT
1.
Turn the ignition switch ON.
2.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “P1804” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010991995
1.
REPLACE 4WD CONTROL UNIT
CAUTION:
Replace 4WD control unit when DTC “P1804” is detected simultaneously with other items.
>> Replace 4WD control unit. Refer
DLN-76, "Removal and Installation"
.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1804
CONTROL UNIT
(Control unit)
Malfunction is detected in the memory (EEPROM) system of
4WD control unit.
DLN-52
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TY21C]
P1808 WHEEL SPEED SENSOR
P1808 WHEEL SPEED SENSOR
DTC Description
INFOID:0000000010991996
DTC DETECTION LOGIC
POSSIBLE CAUSE
• ABS malfunction
• Internal malfunction of 4WD control unit
FAIL-SAFE
4WD control changes to front-wheel drive gradually (rear-wheels still have some driving torque), then 4WD
control stops, and the vehicle becomes front-wheel drive.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
DTC REPRODUCTION PROCEDURE
With CONSULT
1.
Turn the ignition switch ON.
2.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “P1808” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
.
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010991997
1.
PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT
Perform self-diagnosis for “ABS”.
Is any DTC detected?
YES
>> Check the DTC. Refer to
.
NO
>> GO TO 2.
2.
CHECK TERMINALS AND HARNESS CONNECTORS
Check 4WD control unit pin terminals for damage or loose connection with harness connector.
Is inspection result normal?
YES
>> After turning the ignition switch OFF, perform DTC confirmation procedure again. If DTC “P1808”
is detected, Replace 4WD control unit. Refer to
DLN-76, "Removal and Installation"
NO
>> Repair or replace error-detected parts.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1808
VHCL SPEED SEN-ABS
(Vehicle speed sensor-ABS)
• Malfunction is detected in vehicle speed signal that is out-
put from ABS actuator and electric unit (control unit)
through CAN communication.
• Improper signal is input while driving.
P1809 4WD CONTROL UNIT
DLN-53
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TY21C]
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P1809 4WD CONTROL UNIT
DTC Description
INFOID:0000000010991998
DTC DETECTION LOGIC
POSSIBLE CAUSE
Internal malfunction of 4WD control unit
FAIL-SAFE
4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
DTC REPRODUCTION PROCEDURE
With CONSULT
1.
Turn the ignition switch ON.
2.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “P1809” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010991999
1.
REPLACE 4WD CONTROL UNIT
CAUTION:
Replace 4WD control unit when DTC “P1809” is detected simultaneously with other items.
>> Replace 4WD control unit. Refer
DLN-76, "Removal and Installation"
.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1809
CONTROL UNIT
(Control unit)
AD converter system of 4WD control unit is malfunctioning.
DLN-54
< DTC/CIRCUIT DIAGNOSIS >
[TRANSFER: TY21C]
P1811 BATTERY VOLTAGE
P1811 BATTERY VOLTAGE
DTC Description
INFOID:0000000010992000
DTC DETECTION LOGIC
POSSIBLE CAUSE
• Malfunction of 4WD control unit power supply circuit (open or short)
• Battery power supply
• Ignition power supply
• Internal malfunction of 4WD control unit
FAIL-SAFE
4WD control changes to front-wheel drive immediately, then 4WD control stops, and the vehicle becomes
front-wheel drive.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
DTC REPRODUCTION PROCEDURE
With CONSULT
1.
Turn the ignition switch ON.
2.
Perform self-diagnosis for “ALL MODE AWD/4WD”.
Is DTC “P1811” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO-1
>> To check malfunction symptom before repair: Refer to
GI-44, "Intermittent Incident"
.
NO-2
>> Confirmation after repair: INSPECTION END
Diagnosis Procedure
INFOID:0000000010992001
1.
CHECK 4WD CONTROL UNIT POWER SUPPLY (1)
1.
Turn the ignition switch OFF.
2.
Disconnect 4WD control unit harness connector.
3.
Check the voltage between 4WD control unit harness connector and ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between 4WD control unit harness connector and ground.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1811
BATTERY VOLTAGE
(Battery voltage)
When engine is running and 4WD control unit power supply
is less than 9 V or higher than 16 V.
4WD control unit
—
Voltage (Approx.)
Connector
Terminal
B5
7
Ground
0 V
4WD control unit
—
Voltage
Connector
Terminal
B5
7
Ground
Battery voltage
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