Infiniti G37 Coupe. Manual — part 1261
C1909 4WAS MAIN CONTROL UNIT
STC-95
< 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 main control unit harness connector No. 27 termi-
nal
• Ignition switch
2.
CHECK 4WAS MAIN CONTROL UNIT GROUND
Check the continuity between 4WAS main control unit harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 3.
NG
>> Repair or replace the harnesses and connectors.
3.
PERFORM SELF-DIAGNOSIS (4WAS MAIN CONTROL UNIT)
With CONSULT-III
1.
Connect 4WAS main control unit harness connector.
2.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1909” detected?
YES
>> Replace 4WAS main control unit. Refer to
NO
>> GO TO 4.
4.
CHECK INFORMATION
With CONSULT-III
Check the “DATA MONITOR” value of each DTC detected with the self-diagnosis function. Refer to
.
Is each data the standard value?
YES
>> Check each harness connector pin terminal for disconnection.
NO
>> Replace 4WAS main control unit. Refer to
Special Repair Requirement
INFOID:0000000001666404
BEFORE REPLACING 4WAS MAIN CONTROL UNIT
• Record the self-diagnosis results (history).
CAUTION:
• Never erase the memory (history) of self-diagnosis results when replacing 4WAS main 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”.
4WAS main control unit
Continuity
Connector
Terminal
B54
34 – Ground
Existed
STC-96
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1911, C1912 4WAS REAR MOTOR POWER SUPPLY
C1911, C1912 4WAS REAR MOTOR POWER SUPPLY
Description
INFOID:0000000001666405
• The power supply for 4WAS rear motor.
DTC Logic
INFOID:0000000001666406
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
RECHECK DTC
1.
Turn the ignition switch from OFF to ON.
CAUTION:
Stop the vehicle. Wait 15 minutes or more.
2.
Perform 4WAS main control unit self-diagnosis.
Is DTC “C1911” or “C1912” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001666407
1.
CHECK 4WAS MAIN CONTROL UNIT POWER SUPPLY
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS main control unit harness connector.
3.
Check the voltage between 4WAS main control unit harness connectors and the ground.
4.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
5.
Check the voltage between 4WAS main control unit harness connectors and the ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>>
Check the following items. Repair or replace the malfunctioning parts.
• 10A fuse (#45) open
- Short among 10A fuse (#45) connector, 4WAS main control unit harness connector No. 27 ter-
minal and the ground
• Open between the ignition switch and 4WAS main control unit harness connector No. 27 termi-
nal
DTC
Items
(CONSULT-III screen terms)
Diagnostic item is detected when...
Possible cause
C1911
MOTOR VOLTAGE
[LOW VOLTAGE]
4WAS rear motor voltage error is detected.
(4WAS rear motor voltage is low.)
4WAS rear motor power
supply error
C1912
MOTOR VOLTAGE
[BAD OBSTRCT]
4WAS rear motor voltage error is detected.
(Voltage is applied to 4WAS main motor when 4WAS
main control unit output is “OFF”.)
4WAS rear motor power
supply error
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
27 – Ground
0 V
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
27 – Ground
Battery voltage
C1911, C1912 4WAS REAR MOTOR POWER SUPPLY
STC-97
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• Ignition switch
2.
CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (1)
1.
Turn the ignition switch OFF.
2.
Remove 4WAS rear motor relay.
3.
Check the continuity between 4WAS rear motor relay harness connector terminal and the ground.
4.
Check the continuity between 4WAS rear motor relay harness connector terminal and 4WAS main control
unit harness connector terminal.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace the harnesses and connectors.
3.
CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (2)
Check the voltage between 4WAS rear motor relay harness connector terminal and the ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>>
Check the following items. Repair or replace the malfunctioning parts.
• 20A fuse (#37) open
- Short among 20A fuse (#37) connector, 4WAS rear motor relay harness connector No. 3 termi-
nal and the ground
• Open between the battery and 4WAS rear motor relay harness connector No. 3 terminal
4.
CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (3)
1.
Remove the noise suppressor.
2.
Check continuity between the noise suppressor harness connector terminal and the ground.
3.
Check the continuity between the noise suppressor harness connector terminal and 4WAS rear motor
relay harness connector terminal.
4WAS rear motor relay
Continuity
Connector
Terminal
B53
1 – Ground
Existed
2 – Ground
Not existed
4WAS rear motor relay
4WAS main control unit
Continuity
Connector
Terminal
Connector
Terminal
B53
2
B54
25
Existed
4WAS rear motor relay
Voltage (Approx.)
Connector
Terminal
B53
3 – Ground
Battery voltage
Noise suppressor
Continuity
Connector
Terminal
B51
3 – Ground
Not existed
5 – Ground
B52
1 – Ground
Not existed
2 – Ground
Existed
Noise suppressor
4WAS rear motor relay
Continuity
Connector
Terminal
Connector
Terminal
B52
1
B53
5
Existed
STC-98
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C1911, C1912 4WAS REAR MOTOR POWER SUPPLY
4.
Check the continuity between the noise suppressor harness connector terminal and 4WAS main control
unit harness connector terminal.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace the harnesses and connectors.
5.
CHECK 4WAS REAR MOTOR POWER SUPPLY CIRCUIT (4)
1.
Connect 4WAS main control unit harness connector.
2.
Turn the ignition switch ON.
CAUTION:
Never start the engine.
3.
Check the voltage between 4WAS main control unit harness connectors and the ground.
4.
Turn the ignition switch OFF.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace 4WAS main control unit. Refer to
6.
CHECK 4WAS REAR MOTOR RELAY
1.
Apply 12 V to 4WAS rear motor relay connector No. 1 terminal and No. 2 terminal.
CAUTION:
• Never make the terminals short.
• Connect the fuse between the terminals when applying the voltage.
2.
Check the continuity between 4WAS rear motor relay connector terminals.
3.
Check the resistance between 4WAS rear motor relay connector terminals.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace 4WAS rear motor relay.
7.
CHECK NOISE SUPPRESSOR
Check continuity between the noise suppressor connector terminals.
Noise suppressor
4WAS main control unit
Continuity
Connector
Terminal
Connector
Terminal
B51
3
B54
37
Existed
5
40
Existed
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
25 – Ground
Battery voltage
4WAS rear motor relay
Continuity
Connector
Terminal
Condition
B53
3 – 5
Apply the voltage between
No. 1 terminal and No. 2 ter-
minal.
Existed
Do not apply the voltage be-
tween No. 1 terminal and
No. 2 terminal.
Not existed
4WAS rear motor relay
Resistance (Approx.)
Connector
Terminal
B53
1 – 2
50
Ω
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