Infiniti G37 Coupe. Manual — part 1271
POWER SUPPLY AND GROUND CIRCUIT
STC-135
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
• 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 and the ground.
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.
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.
Noise suppressor
Continuity
Connector
Terminal
B51
3 – Ground
Not existed
5 – Ground
B52
1 – Ground
Not existed
2 – Ground
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
STC-136
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
POWER SUPPLY AND GROUND CIRCUIT
NO
>> Replace 4WAS rear motor relay.
7.
CHECK NOISE SUPPRESSOR
Check continuity between the noise suppressor connector terminals.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Replace the noise suppressor.
8.
CHECK 4WAS REAR MOTOR POWER SUPPLY
1.
Connect 4WAS main control unit harness connector.
2.
Install 4WAS rear motor relay.
3.
Install the noise suppressor.
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
>> INSPECTION END.
NO
>> Replace 4WAS main control unit. Refer to
Component Inspection (4WAS Rear Motor Relay)
INFOID:0000000001666470
1.
CHECK 4WAS REAR MOTOR RELAY
1.
Turn the ignition switch OFF.
2.
Remove 4WAS rear motor relay connector.
3.
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.
4.
Check the continuity between 4WAS rear motor relay connector terminals.
5.
Check the resistance between 4WAS rear motor relay connector terminals.
Noise suppressor
Continuity
Connector
Terminal
Connector
Terminal
B51
3
B52
1
Existed
B51
3
B51
5
Not existed
B51
3
B52
2
Not existed
B51
5
B52
2
Existed
B51
5
B52
1
Not existed
4WAS main control unit
Voltage (Approx.)
Connector
Terminal
B54
37 – 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
POWER SUPPLY AND GROUND CIRCUIT
STC-137
< 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
>> INSPECTION END
NO
>> Replace 4WAS rear motor relay.
Component Inspection (Noise Suppressor)
INFOID:0000000001666471
1.
NOISE SUPPRESSOR INSPECTION
1.
Turn the ignition switch OFF.
2.
Remove the noise suppressor.
3.
Check continuity between the noise suppressor connector terminals.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace the noise suppressor.
4WAS rear motor relay
Resistance (Approx.)
Connector
Terminal
B53
1 – 2
50
Ω
Noise suppressor
Continuity
Connector
Terminal
Connector
Terminal
B51
3
B52
1
Existed
B51
3
B51
5
Not existed
B51
3
B52
2
Not existed
B51
5
B52
2
Existed
B51
5
B52
1
Not existed
STC-138
< COMPONENT DIAGNOSIS >
[WITH 4WAS]
POWER STEERING SOLENOID VALVE
POWER STEERING SOLENOID VALVE
Description
INFOID:0000000001666472
• The power steering oil pressure in the gear housing assembly is controlled.
Diagnosis Procedure
INFOID:0000000001666473
1.
CHECK POWER STEERING SOLENOID VALVE SIGNAL
With CONSULT-III
1.
Start the engine.
2.
Check “POWER STR SOL” item on “DATA MONITOR” of 4WAS main control unit.
Without CONSULT-III
1.
Start the engine.
2.
Check the voltage between 4WAS main control unit harness connector and the ground.
3.
Check that there is no malfunction in 4WAS main control unit harness connector or disconnection.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Replace 4WAS main control unit. Refer to
2.
CHECK POWER STEERING SOLENOID VALVE CIRCUIT
1.
Turn the ignition switch OFF.
2.
Disconnect 4WAS main control unit harness connector.
3.
Disconnect the power steering solenoid valve harness connector.
4.
Check the continuity between 4WAS main control unit harness connector and power steering solenoid
valve harness connector.
5.
Check the continuity between power steering solenoid valve harness connector and the ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace the harnesses and connectors.
Monitor item
Condition
Display value
POWER STR SOL
Vehicle speed: 0 km/h (0 MPH)
(Engine is running)
Approx. 1.10 A
Vehicle speed: 100 km/h (62 MPH)
Approx. 0.42 A
4WAS main control unit
Data (Approx.)
Connector
Terminal
Condition
B54
36 – Ground
Vehicle speed: 0 km/h (0 MPH)
(Engine is running)
4.4 – 6.6 V
Vehicle speed: 100 km/h (62
MPH)
2.4 – 3.6 V
4WAS main control unit
Power steering solenoid
valve
Continuity
Connector
Terminal
Connector
Terminal
B54
36
F45
1
Existed
Power steering solenoid valve
Continuity
Connector
Terminal
F45
2 – Ground
Existed
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