Infiniti G37 Coupe. Manual — part 1278
4WAS MAIN CONTROL UNIT
STC-163
< ECU DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
Fail Safe
INFOID:0000000001666485
4WAS system (Main)
• 4WAS system enters in the fail-safe mode (4WAS system stopped) and 4WAS warning lamp turns ON if an
error is detected in 4WAS system (4WAS main control unit) component part.
• 4WAS system enters in the protection function mode (4WAS system temporarily stopped) if 4WAS system
continues the heavy load condition or the sensor self-check condition. (4WAS system reactivates automati-
JCGWA0054GB
STC-164
< ECU DIAGNOSIS >
[WITH 4WAS]
4WAS MAIN CONTROL UNIT
cally if the heavy load condition and the self-check condition are resolved.) 4WAS warning lamp stays OFF
in the protection function mode.
*: Communication line between 4WAS front control unit and 4WAS main control unit.
Mode
Warn-
ing
lamp
DTC
Detected area (Error area)
Error area and root cause
Fail-safe
Turn-
ON
C1900
C1901
C1905
C1906
C1907
C1908
C1922
C1925
C1927
C1928
C1933
4WAS main control unit
4WAS main control unit error
Turn-
ON
C1902
C1903
C1904
C1910
C1913
4WAS rear motor
4WAS rear motor error
Turn-
ON
C1909
4WAS main control unit
4WAS main control unit
Turn-
ON
C1911
C1912
4WAS rear motor
4WAS rear motor power supply error
Turn-
ON
C1914
Rear wheel steering sensor
Rear wheel steering sensor power supply error
Turn-
ON
C1915
C1916
Rear wheel steering sensor
Rear wheel steering sensor output voltage error
Turn-
OFF
C1917
Rear wheel steering sensor
Rear wheel steering sensor (main and sub) output signal value error
signal
Turn-
ON
C1918
Rear wheel steering sensor
Rear wheel steering sensor (main and sub) output signal error
Turn-
ON
C1919
ABS actuator and electric unit
(control unit)
Vehicle speed signal error
Turn-
ON
C1920
C1923
C1924
Steering angle sensor
Steering angle sensor input signal error
Turn-
ON
C1921
ECM
Engine speed signal error
Turn-
ON
C1926
Steering angle sensor
Steering angle sensor error
Turn-
ON
C1930
4WAS front control unit
4WAS front control unit fail-safe mode
Turn-
ON
C1931
4WAS communication line*/
4WAS front control unit/4WAS
main control unit
4WAS communication line*/4WAS front control unit/4WAS main
control unit error
Turn-
ON
C1932
Steering angle sensor
Steering angle sensor input signal error
Turn-
ON
U1000
CAN communication line*
CAN communication error
Turn-
ON
U1010
CAN communication line*/
4WAS main control unit/ECM/
ABS actuator and electric unit
(control unit)
CAN communication line/4WAS main control unit/ECM/ABS actua-
tor and electric unit (control unit) error
4WAS MAIN CONTROL UNIT
STC-165
< ECU DIAGNOSIS >
[WITH 4WAS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
N
O
P
EPS system
• EPS system (4WAS main control unit) enters the fail-safe mode
(that allows the steering force to be controlled without impairing the
drive ability) if the input from each sensor is not within the specified
range. Then, 4WAS warning lamp turns ON.
DTC Inspection Priority Chart
INFOID:0000000001666486
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
JSGIA0055GB
Mode
Warn-
ing
lamp
DTC
Detected area (Error area)
Error part and root cause
Fail-safe
Turn-
ON
C1919
ABS actuator and electronic
unit (control unit)
Vehicle speed signal error
Priority
Detected items (DTC)
1
• U1000 CAN COMM
• U1010 CONTROL UNIT (CAN)
2
• C1900 CONTROL UNIT [ABNORMAL1]
• C1901 CONTROL UNIT [ABNORMAL2]
• C1905 CONTROL UNIT [ABNORMAL3]
• C1906 CONTROL UNIT [ABNORMAL5]
• C1907 CONTROL UNIT [ABNORMAL4]
• C1908 CONTROL UNIT [ABNORMAL7]
• C1909 CONTROL UNIT [ABNORMAL6]
• C1922 CONTROL UNIT [ABNORMAL8]
• C1925 AD CONVERTER
• C1927 CONTROL UNIT [ABNORMAL5]
• C1928 CONTROL UNIT [ABNORMAL9]
• C1933 CONTROL UNIT
3
• C1902 MOTOR OUTPUT [REV CURRENT]
• C1903 MOTOR OUTPUT [NO CURRENT]
• C1904 MOTOR OUTPUT [OVERCURRENT]
• C1910 MOTOR OUTPUT [MOTOR LOCK]
• C1911 MOTOR VOLTAGE [LOW VOLTEGE]
• C1912 MOTOR VOLTAGE [BAD OBSTRCT]
• C1913 MOTOR OUTPUT [ABNORML SIG]
• C1914 RR ST ANGLE SENSOR [ABNORML VOL]
• C1915 RR ST ANGLE SENSOR [MAIN SIGNAL]
• C1916 RR ST ANGLE SENSOR [SUB SIGNAL]
• C1917 RR ST ANGLE SENSOR [OFFSET SIG1]
• C1918 RR ST ANGLE SENSOR [OFFSET SIG2]
4
• C1919 VEHICLE SPEED SEN [NO SIGNAL]
• C1920 STEERING ANGLE SEN [NO SIGNAL]
• C1921 ENG REV SIGNAL
• C1923 STEERING ANGLE SEN [NO CHANGE]
• C1924 STEERING ANGLE SEN [NO NEUT STATE]
• C1926 STEERING ANGLE SEN
• C1932 STEERING ANGLE SEN
5
• C1930 4WAS FRONT ECU
• C1931 4WAS FRONT ECU COMM
STC-166
< ECU DIAGNOSIS >
[WITH 4WAS]
4WAS MAIN CONTROL UNIT
DTC Index
INFOID:0000000001666487
DTC
Items
(CONSULT-III screen terms)
Reference
C1900
CONTROL UNIT
[ABNORMAL1]
C1901
CONTROL UNIT
[ABNORMAL2]
C1902
MOTOR OUTPUT
[REV CURRENT]
C1903
MOTOR OUTPUT
[NO CURRENT]
C1904
MOTOR OUTPUT
[OVERCURRENT]
C1905
CONTROL UNIT
[ABNORMAL3]
C1906
CONTROL UNIT
[ABNORMAL5]
C1907
CONTROL UNIT
[ABNORMAL4]
C1908
CONTROL UNIT
[ABNORMAL7]
C1909
CONTROL UNIT
[ABNORMAL6]
C1910
MOTOR OUTPUT
[MOTOR LOCK]
C1911
MOTOR VOLTAGE
[LOW VOLTEGE]
C1912
MOTOR VOLTAGE
[BAD OBSTRCT]
C1913
MOTOR OUTPUT
[ABNORML SIG]
C1914
RR ST ANGLE SENSOR
[ABNORML VOL]
C1915
RR ST ANGLE SENSOR
[MAIN SIGNAL]
C1916
RR ST ANGLE SENSOR
[SUB SIGNAL]
C1917
RR ST ANGLE SENSOR
[OFFSET SIG1]
C1918
RR ST ANGLE SENSOR
[OFFSET SIG2]
C1919
VEHICLE SPEED SEN
[NO SIGNAL]
C1920
STEERING ANGLE SEN
[NO SIGNAL]
C1921
ENG REV SIGNAL
C1922
CONTROL UNIT
[ABNORMAL8]
C1923
STEERING ANGLE SEN
[NO CHANGE]
C1924
STEERING ANGLE SEN
[NO NEUT STATE]
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