Infiniti G37 Coupe. Manual — part 1273
4WAS FRONT CONTROL UNIT
STC-143
< ECU DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
ACTR ANGL SUB
Steer the steering wheel leftward slowly. Steer until the steering
stops.
Approx. 0 –
−
60 deg
Steer the steering wheel rightward slowly. Steer until the steering
stops.
Approx. 0 – 60 deg
STR ANGL SPD
The steering wheel is not steered.
0 deg/s
The steering wheel is steering.
Other than 0 deg/s
OVRLD JDG TMG
It displays record of 4WAS system (entire 4WAS system) high
load.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
ACT PRTCT TMG
It displays record of 4WAS system (4WAS front actuator) over-
heating.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
ECU PRTCT TMG
It displays record of 4WAS system (4WAS front control unit) over-
heating.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
DRV TMPO TMG
It displays record of 4WAS system (terminal power supply convert-
er of 4WAS front motor) intermittent abnormal.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
MTR PW TMP TM
It displays record of 4WAS system (terminal voltage of 4WAS front
motor) intermittent abnormal.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
LOW VOLT TMG
It displays record of 4WAS system (terminal voltage of 4WAS front
control unit and 4WAS front actuator) low voltage.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
HIGH VOLT TMG
It displays record of 4WAS system (terminal voltage of 4WAS front
control unit and 4WAS front actuator) extreme voltage.
(It displays time of occurrence before turning ignition switch ON.)
0 – 39
OVRLD JDG FLG
4WAS system (the entire 4WAS system) heavy load condition
judgment
(Condition detected in past and present.)
On
4WAS system (the entire 4WAS system) heavy load condition
judgment
(Condition not detected in past and present.)*
Off
ACT PRTCT FLG
4WAS front actuator overheat condition judgment
(Condition detected in past and present.)
On
4WAS front actuator overheat condition judgment
(Condition not detected in past and present.)*
Off
ECU PRTCT FLG
4WAS front control unit overheat condition judgment
(Condition detected in past and present.)
On
4WAS front control unit overheat condition judgment
(Condition not detected in past and present.)*
Off
DRV TMPO FLG
4WAS system (4WAS front motor terminal power supply convert-
er) intermittent error.
(Condition detected in past and present.)
On
4WAS system (4WAS front motor terminal power supply convert-
er) intermittent error.
(Condition not detected in past and present.)*
Off
MTR PW TMP FL
4WAS system (4WAS front motor terminal voltage) intermittent er-
ror.
(Condition detected in past and present.)
On
4WAS system (4WAS front motor terminal voltage) intermittent er-
ror.
(Condition not detected in past and present.)*
Off
Monitor item
Condition
Value/Status
STC-144
< ECU DIAGNOSIS >
[WITH 4WAS]
4WAS FRONT CONTROL UNIT
*: “Off” is indicated if the self-diagnosis result memory is erased.
TERMINAL LAYOUT
PHYSICAL VALUES
LOW VOLT FLG
4WAS system (4WAS front control unit and 4WAS front actuator
terminal voltage) voltage-dropped condition
(Condition detected in past and present.)
On
4WAS system (4WAS front control unit and 4WAS front actuator
terminal voltage) voltage-dropped condition
(Condition not detected in past and present.)*
Off
HIGH VOLT FLG
4WAS system (4WAS front control unit and 4WAS front actuator
terminal voltage) over-voltage condition
(Condition detected in past and present.)
On
4WAS system (4WAS front control unit and 4WAS front actuator
terminal voltage) over-voltage condition
(Condition not detected in past and present.)*
Off
MTR SEN U OUT
The steering wheel is steering.
Hi
⇔
Low
MTR SEN V OUT
The steering wheel is steering.
Hi
⇔
Low
MTR SEN W OUT
The steering wheel is steering.
Hi
⇔
Low
MAIN ECU FAIL
4WAS main control unit fail-safe mode
On
4WAS system is in the normal condition.
(When 4WAS main control unit is the normal condition.)
Off
M-ECU TMPO FL
4WAS main control unit protection function mode
On
4WAS system is in the normal condition.
(When 4WAS main control unit is the normal condition.)
Off
LOCK MODE
4WAS front lock sole-
noid valve (lock struc-
ture) condition
Lock released condition
0
Lock condition
1, 2, 3, 4, 5
NEUTRAL OUT
4WAS front actuator misaligned angle adjustment control is con-
trolled.
On
4WAS front actuator misaligned angle adjustment is not controlled.
Off
EX OPERAT
4WAS system enters in the protection function due to the heavy
load condition and temporarily abnormal voltage.
On
4WAS system is in the normal condition.
Off
SLOW MODE
ACTIVE TEST “SLOW MODE” judgment condition
(Steer the steering wheel rightward and leftward slowly. Steer until
the turning stops.)
Ok
—
Monitor item
Condition
Value/Status
JSGIA0015ZZ
4WAS FRONT CONTROL UNIT
STC-145
< 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:0000000001666479
Click here to view the eWD.
Terminal No.
Wire
color
Description
Condition
Value (Approx.)
+
-
Signal name
Input/
Output
1
—
G
4WAS front motor V
terminal
—
—
—
2
Ground
W
Front wheel angle
sensor W terminal
voltage
Output
Ignition switch: ON
0 – 5 V
3
—
B
4WAS front lock so-
lenoid valve ground
—
—
—
4
Ground
Y
Front wheel angle
sensor U terminal
voltage
Output
Ignition switch: ON
0 – 5 V
5
—
BR
4WAS front motor U
terminal
—
—
—
6
—
L
4WAS front motor W
terminal
—
—
—
7
—
GR
Front wheel angle
sensor ground
—
—
—
8
Ground
G/R
Front wheel angle
sensor V terminal
voltage
Output
Ignition switch: ON
0 – 5 V
10
Ground
R
4WAS front lock so-
lenoid valve power
supply
Output
Ignition switch: ON
Battery voltage
Ignition switch: OFF
(Wait 10 min. or more.)
0 V
11
Ground
R
Power supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
Battery voltage
12
Ground
B
4WAS front motor
ground
—
Always
0 V
14
—
Y
BUS-L
—
—
—
15
Ground
LG
Ignition switch pow-
er supply
Input
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
18
Ground
B
Ground
—
Always
0 V
25
—
SB
BUS-H
—
—
—
34
Ground
B
Ground
—
Always
0 V
STC-146
< ECU DIAGNOSIS >
[WITH 4WAS]
4WAS FRONT CONTROL UNIT
JCGWA0049GB
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