Infiniti G37 Coupe. Manual — part 1253
C1652 4WAS FRONT MOTOR POWER SUPPLY
STC-63
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
NO
>> GO TO 3.
3.
4WAS FRONT CONTROL UNIT SIGNAL INSPECTION
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Check “MOTOR 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:0000000001666335
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-64
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1654 4WAS FRONT ACTUATOR RELAY
C1654 4WAS FRONT ACTUATOR RELAY
Description
INFOID:0000000001666336
• It performs control inside 4WAS front control unit.
• The actuator relay turns ON when turning the ignition switch ON.
• When turning the ignition switch from ON to OFF, the actuator relay remains ON and is turned OFF after a
few minutes due to the 4WAS front control unit control.
DTC Logic
INFOID:0000000001666337
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 “C1654” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666338
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
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1654
ACTUATOR RELAY
An error is detected on the main relay power supply in-
side 4WAS front control unit.
The main relay power
supply inside 4WAS front
control unit error is de-
tected.
4WAS front control unit
Continuity
Connector
Terminal
M41
12 – Ground
Existed
4WAS front control unit
Voltage (Approx.)
Connector
Terminal
M41
11 – 12
Battery voltage
C1654 4WAS FRONT ACTUATOR RELAY
STC-65
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
- 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
NO
>> GO TO 3.
3.
4WAS FRONT CONTROL UNIT SIGNAL INSPECTION
With CONSULT-III
1.
Start the engine.
CAUTION:
Stop the vehicle.
2.
Check “MOTOR 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:0000000001666339
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-66
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1655 4WAS FRONT DRIVER
C1655 4WAS FRONT DRIVER
Description
INFOID:0000000001666340
• It perform control inside 4WAS front control unit.
• The power supply for 4WAS front motor (3-phase motor).
DTC Logic
INFOID:0000000001666341
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 “C1655” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666342
1.
CHECK 4WAS FRONT MOTOR GROUND
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS front control unit harness connector.
3.
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.
PERFORM SELF-DIAGNOSIS (4WAS FRONT CONTROL UNIT)
With CONSULT-III
1.
Connect 4WAS front control unit harness connector.
2.
Perform 4WAS front control unit self-diagnosis.
Is DTC “C1622” detected?
YES
>> Check the error system.
NO
>> Replace 4WAS front control unit. Refer to
.
Special Repair Requirement
INFOID:0000000001666343
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.
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1655
PRE-DRIVER
4WAS front motor 3-phase current error is detected.
(Current is not applied to 4WAS front motor)
4WAS front control unit or
4WAS front motor power
supply error is detected.
4WAS front control unit
Continuity
Connector
Terminal
M41
12 – Ground
Existed
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