Infiniti G37 Coupe. Manual — part 1276
4WAS MAIN CONTROL UNIT
STC-155
< ECU DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
4WAS MAIN CONTROL UNIT
Reference Value
INFOID:0000000001666483
VALUES ON THE DIAGNOSIS TOOL
CONSULT-III MONITOR ITEM
Monitor item
Condition
Value/Status
VHCL SPEED SE
Vehicle stopped
0 km/h (0 MPH)
Start the engine. Wait a minute. Drive the vehicle.
CAUTION:
Check air pressure of tire under standard conditions.
Approximately equal to the indi-
cation on speedometer (Inside
of
±
10%)
STEERING ANG
Steering wheel turned right
Approx. 0 – R550
°
Straight-ahead
Approx. 0
°
Steering wheel turned left
Approx. 0 – L550
°
ENGINE SPEED
Engine stopped
0 rpm
Engine running
(Engine speed: 400 rpm or more)
Approximately equal to the indi-
cation on tachometer
STR ANGL SPD
The steering wheel is not steered.
0 deg/s
The steering wheel is steering.
1 – 3,000 deg/s
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
RR ST ANG-MAI
4WAS rear actuator turns right completely
Approx. 4.4 V
4WAS rear actuator is neutral
Approx. 2.4 V
4WAS rear actuator turns left completely
Approx. 0.4 V
RR ST ANG-SUB
4WAS rear actuator turns right completely
Approx. 4.4 V
4WAS rear actuator is neutral
Approx. 2.6 V
4WAS rear actuator turns left completely
Approx. 0.4 V
RR ST ANG-VOL
Ignition switch: ON
Approx. 5 V
C/U VOLTAGE
Ignition switch: ON
Battery voltage
MOTOR VOLTAGE
Ignition switch: ON
Battery voltage
MOTOR CURRENT
4WAS rear motor running
0 – 20 A
MTR CRNT OPE
4WAS rear actuator neutral condition and vehicle straight-ahead
position.
Approx.
−
2 – 2 A
4WAS rear motor running
Approx.
−
20 – 20 A
RR ANGLE OPE
4WAS rear actuator turned right
Approx. 0 – 1 deg
4WAS rear actuator is neutral
Approx. 0 deg
4WAS rear actuator turned left
Approx. 0 –
−
1 deg
FR ANGLE OPE
Steering wheel turned to the right (with vehicle stopped).
Approx. 0 – R60
°
Straight-ahead
Approx. 0
°
Steering wheel turned to the left (with vehicle stopped).
Approx. 0 – L60
°
STOP LAMP SW
Brake pedal: Depressed
On
Brake pedal: Released
Off
HICAS RELAY
Ignition switch: ON
On
FAIL SAFE
Fail-safe condition
On
Normal
Off
WARNING LAMP
4WAS warning lamp: ON
On
4WAS warning lamp: OFF
Off
STC-156
< ECU DIAGNOSIS >
[WITH 4WAS]
4WAS MAIN CONTROL UNIT
TERMINAL LAYOUT
PHYSICAL VALUES
FRONT ECU FAIL
4WAS front control unit fail-safe mode
On
Normal
Off
FRONT ECU EX
4WAS front control unit enters in the protection function mode
On
Normal
Off
Monitor item
Condition
Value/Status
SGIA1449E
Terminal No.
Wire
color
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
1
—
L
CAN-H
—
—
—
4
Ground
BR
Rear wheel steering
angle sensor (main)
output voltage
Output
4WAS rear actuator assembly turns
right completely.
4.4 V
4WAS rear actuator assembly is neu-
tral
2.4 V
4WAS rear actuator assembly turns
left completely.
0.4 V
5
Ground
W
Rear wheel steering
angle sensor power
supply
Output
Ignition switch: ON
5 V
Ignition switch: OFF
0 V
7
Ground
R
Rear wheel steering
angle sensor (sub)
output voltage
Output
4WAS rear actuator assembly turns
right completely.
4.4 V
4WAS rear actuator assembly is neu-
tral
2.6 V
4WAS rear actuator assembly turns
left completely.
0.4 V
8
—
P
CAN-L
—
—
—
15
Ground
G
Rear wheel steering
angle sensor
ground
—
Always
0 V
22
Ground
GR
Stop lamp switch
Input
Brake pedal: Depressed
Battery voltage
Brake pedal: Released
0 V
25
Ground
SB
4WAS rear motor
relay
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
27
Ground
V
Ignition switch
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
31
—
BR
4WAS communica-
tion-H
—
—
—
32
—
Y
4WAS communica-
tion-L
—
—
—
4WAS MAIN CONTROL UNIT
STC-157
< ECU DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
CAUTION:
When using circuit tester to measure voltage for inspection, never forcibly extend any connector terminals.
Wiring Diagram - 4WAS SYSTEM -
INFOID:0000000001666484
Click here to view the eWD.
34
Ground
B
Ground
—
Always
0 V
36
Ground
LG
Power steering so-
lenoid valve
Output
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
37
Ground
P
4WAS rear motor
power supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
38
Ground
W
4WAS rear motor
output voltage
(right)
Output
While 4WAS rear motor activates
rightward
Battery voltage
While 4WAS rear motor activates left-
ward
0 V
39
Ground
B
4WAS rear motor
output voltage
(left)
Output
While 4WAS rear motor activates
rightward
0 V
While 4WAS rear motor activates left-
ward
Battery voltage
40
Ground
B
4WAS rear motor
ground
—
Always
0 V
Terminal No.
Wire
color
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
STC-158
< ECU DIAGNOSIS >
[WITH 4WAS]
4WAS MAIN CONTROL UNIT
JCGWA0049GB
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