Infiniti FX35, FX50 (S51). Manual — part 551
AWD CONTROL UNIT
DLN-39
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ETX13C]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
Fail-Safe
INFOID:0000000005249077
AWD system
• If any malfunction occurs in AWD electrical system, and control unit detects the malfunction, AWD warning
lamp on combination meter turns ON to indicate system malfunction.
• When AWD warning lamp is ON, vehicle changes to rear-wheel drive or shifts to 4-wheel drive (front-wheels
still have some driving torque).
JCDWA0573GB
DLN-40
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ETX13C]
AWD CONTROL UNIT
• AWD system activates its protection function (shuts down AWD system temporarily) if AWD system detects
high load continuously or the front wheel tire size differs from the rear tire size. (AWD system is automati-
cally restored if AWD system no longer detects any overload or the tire size difference is eliminated.)
*1: Quick blinking: 2 times/second (blinking for approximately 1 minute and then turned OFF)
*2: Slow blinking: 1 time/2 seconds (continuing to blink until ignition switch is turned OFF)
DTC Inspection Priority Chart
INFOID:0000000005249078
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC Index
INFOID:0000000005249079
Mode
Warning
lamp
DTC
Detected area (Error area)
Error area and root cause
Protection
function
Blinking
*1
—
AWD control unit
Transfer assembly in protection mode. It is not malfunction.
(Internal temperature rise of electronic controlled coupling)
Blinking
*2
—
Outer diameters of front and
rear wheel tires
Malfunction in each tire or different tire diameter
Fail-safe
ON
C1201
AWD control unit
Internal malfunction of AWD control unit
C1203
ABS actuator and electric
unit (control unit)
ABS malfunction
• Vehicle speed signal error
C1204
AWD solenoid
Internal malfunction of electronic controlled coupling
C1205
AWD control unit
Internal malfunction of AWD control unit
C1210
ECM
Malfunction of engine control system
P1804
AWD control unit
Internal malfunction of AWD control unit
P1809
AWD control unit
Internal malfunction of AWD control unit
P1826
Transfer fluid temperature
sensor
Internal malfunction of electric controlled coupling
U1000
CAN communication line
• CAN communication error
• Malfunction of AWD control unit
U1010
AWD control unit
Malfunction of AWD control unit
Priority
Detected items (DTC)
1
• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT (CAN)
2
• C1201 CONTROLLER FAILURE
• C1205 4WD ACTUATOR RLY
• P1804 CONTROL UNIT 3
• P1809 CONTROL UNIT 4
3
• C1203 ABS SYSTEM
• C1210 ENGINE SIGNAL 1
4
• C1204 4WD SOLENOID
• P1826 OIL TEMP SEN
DTC
Display Items
Reference
C1201
CONTROLLER FAILURE
C1203
ABS SYSTEM
C1204
4WD SOLENOID
C1205
4WD ACTUATOR RLY
C1210
ENGINE SIGNAL 1
P1804
CONTROL UNIT 3
P1809
CONTROL UNIT 4
AWD CONTROL UNIT
DLN-41
< ECU DIAGNOSIS INFORMATION >
[TRANSFER: ETX13C]
C
E
F
G
H
I
J
K
L
M
A
B
DLN
N
O
P
P1826
OIL TEMP SEN
U1000
CAN COMM CIRCUIT
U1010
CONTROL UNIT (CAN)
DTC
Display Items
Reference
DLN-42
< SYMPTOM DIAGNOSIS >
[TRANSFER: ETX13C]
AWD WARNING LAMP DOES NOT TURN ON
SYMPTOM DIAGNOSIS
AWD WARNING LAMP DOES NOT TURN ON
Description
INFOID:0000000005249080
AWD warning lamp does not turn ON when the ignition switch is turned to ON.
Diagnosis Procedure
INFOID:0000000005249081
1.
CHECK AWD WARNING LAMP
Perform the trouble diagnosis for AWD warning lamp. Refer to
Is the inspection result normal?
YES
>> Check each harness connector pin terminal for malfunction or disconnection.
NO
>> Repair or replace the error-detected parts.
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