Infiniti G37 Coupe. Manual — part 1252
C1633 4WAS FRONT CONTROL UNIT
STC-59
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Replace 4WAS front control unit. Refer to
.
3.
CHECK INFORMATION
• Check that any item below is applicable when malfunction occurs.
- Entering and exiting the garage (Frequent steering)
- When steering the steering wheel for a long time
Is the item applicable?
YES
>> 4WAS system protection function mode (overheat protection)(4WAS system temporary stop)
NO
>> Replace 4WAS front control unit. Refer to
.
Special Repair Requirement
INFOID:0000000001666327
BEFORE REPLACING 4WAS FRONT CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing 4WAS front control unit
after diagnosis.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
AFTER REPLACING 4WAS FRONT CONTROL UNIT
• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to
FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"
Monitor item
Condition
Display value
THERM TEMP
Engine running (idling)
−
40 – 100
°
C
STC-60
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1651 IGNITION POWER SUPPLY
C1651 IGNITION POWER SUPPLY
Description
INFOID:0000000001666328
• 4WAS system function is controlled by transmitting the ignition switch signal to 4WAS front control unit.
DTC Logic
INFOID:0000000001666329
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1651” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666330
1.
CHECK 4WAS FRONT CONTROL UNIT GROUND
1.
Turn the ignition switch OFF.
2.
Check the continuity between 4WAS front control unit harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the harnesses and connectors.
2.
CHECK 4WAS FRONT CONTROL UNIT POWER SUPPLY
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Check the voltage between 4WAS front control unit harness connectors.
Is the measurement value “9 V” or less?
YES
>>
Check the following items. Repair or replace the malfunctioning parts.
• 4WAS front control unit harness connector pin terminal and connection
• 10A fuse (#3) open
- Short among 10A fuse (#3) connector, 4WAS front control unit harness connector No. 15 termi-
nal and the ground
- Short among 10A fuse (#3) connector, unified meter and A/C amp No. 53 terminal and the
ground
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1651
IGN POWER SUPPLY
The ignition voltage signal error is detected.
4WAS front control unit or
the ignition power supply
error is detected.
4WAS front control unit
Continuity
Connector
Terminal
M42
18 – Ground
Existed
4WAS front control unit
Voltage (Approx.)
Connector
Terminal
M42
15 – 18
Battery voltage
C1651 IGNITION POWER SUPPLY
STC-61
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• Open between the ignition switch and 4WAS front control unit harness connector No. 15 termi-
nal
• Ignition switch
NO
>> GO TO 3.
3.
CHECK 4WAS FRONT CONTROL UNIT SIGNAL
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Check “IGN VOLT” item on “DATA MONITOR” of 4WAS front control unit.
Does the item on “DATA MONITOR” indicate “16 V” or more?
YES
>> Perform the symptom diagnosis for the charging system. Refer to
.
NO
>> Replace 4WAS front control unit. Refer to
.
Special Repair Requirement
INFOID:0000000001666331
BEFORE REPLACING 4WAS FRONT CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing 4WAS front control unit
after diagnosis.
• Erase the memory of the self-diagnosis results (record) after printing out or recording all the val-
ues of “DATA MONITOR”.
AFTER REPLACING 4WAS FRONT CONTROL UNIT
• Perform 4WAS front actuator adjustment after replacing 4WAS front control unit. Refer to
FRONT ACTUATOR NEUTRAL POSITION ADJUSTMENT : Special Repair Requirement (Pattern 3)"
STC-62
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1652 4WAS FRONT MOTOR POWER SUPPLY
C1652 4WAS FRONT MOTOR POWER SUPPLY
Description
INFOID:0000000001666332
• The power supply for 4WAS front motor and 4WAS front control unit.
DTC Logic
INFOID:0000000001666333
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
With CONSULT-III
1.
Turn the ignition switch from OFF to ON.
2.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1652” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666334
1.
4WAS FRONT MOTOR GROUND INSPECTION
1.
Turn the ignition switch OFF.
2.
Check the continuity between 4WAS front control unit harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace the harnesses and connectors.
2.
4WAS FRONT MOTOR POWER SUPPLY INSPECTION
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Check the voltage between 4WAS front control unit harness connectors.
Is the measurement value “9 V” or less?
YES
>>
Check the following items. Repair or replace the malfunctioning parts.
• 4WAS front control unit harness connector pin terminal and connection
• 40A fusible link (#I) open
- Short among 40A fusible link (#I) connector, 4WAS front control unit harness connector No. 11
terminal and the ground
• Open between the battery and 4WAS front control unit harness connector No. 11 terminal
• Battery
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1652
MOTOR POWER SUPPLY
4WAS front motor main power supply error is detected
4WAS front control unit or
4WAS front motor power
supply error is detected.
4WAS front control unit
Continuity
Connector
Terminal
M41
12 – Ground
Existed
4WAS front control unit
Voltage (Approx.)
Connector
Terminal
M41
11 – 12
Battery voltage
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