Infiniti FX35, FX50 (S51). Manual - part 1790

RAS CONTROL UNIT

STC-101

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

EPS system

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

RAS control unit

RAS control unit error

Turn-

ON

C1902
C1903
C1904
C1910
C1913

RAS motor

RAS motor error

Turn-

ON

C1909

RAS control unit

RAS control unit

Turn-

ON

C1911

C1912

RAS motor

RAS 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

C1929

ABS actuator and electric unit 
(control unit)

ABS actuator and electric unit (control unit) error

Turn-

ON

U1000

CAN communication line

CAN communication error

Turn-

ON

U1010

RAS control unit

RAS control unit

STC-102

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

RAS CONTROL UNIT

• EPS system (RAS control unit) enters the fail-safe mode (that

allows the steering force to be controlled without impairing the driv-
ability) if the input from each sensor is not within the specified
range. Then, RAS warning lamp turns ON.

DTC Inspection Priority Chart

INFOID:0000000005235459

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

DTC Index

INFOID:0000000005235460

JSGIA0368GB

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 CIRCUIT
• 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 VOLTAGE]
• 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
• C1929 VDC

RAS CONTROL UNIT

STC-103

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

DTC

Items (CONSULT screen terms)

Reference

C1900

CONTROL UNIT
[ABNORMAL1]

STC-42, "DTC Logic"

C1901

CONTROL UNIT
[ABNORMAL2]

STC-42, "DTC Logic"

C1902

MOTOR OUTPUT
[REV CURRENT]

STC-44, "DTC Logic"

C1903

MOTOR OUTPUT
[NO CURRENT]

STC-44, "DTC Logic"

C1904

MOTOR OUTPUT
[OVERCURRENT]

STC-44, "DTC Logic"

C1905

CONTROL UNIT
[ABNORMAL3]

STC-48, "DTC Logic"

C1906

CONTROL UNIT
[ABNORMAL5]

STC-42, "DTC Logic"

C1907

CONTROL UNIT
[ABNORMAL4]

STC-42, "DTC Logic"

C1908

CONTROL UNIT
[ABNORMAL7]

STC-48, "DTC Logic"

C1909

CONTROL UNIT
[ABNORMAL6]

STC-50, "DTC Logic"

C1910

MOTOR OUTPUT
[MOTOR LOCK]

STC-44, "DTC Logic"

C1911

MOTOR VOLTAGE
[LOW VOLTAGE]

STC-52, "DTC Logic"

C1912

MOTOR VOLTAGE
[BAD OBSTRCT]

STC-52, "DTC Logic"

C1913

MOTOR OUTPUT
[ABNORML SIG]

STC-44, "DTC Logic"

C1914

RR ST ANGLE SENSOR
[ABNORML VOL]

STC-56, "DTC Logic"

C1915

RR ST ANGLE SENSOR
[MAIN SIGNAL]

STC-59, "DTC Logic"

C1916

RR ST ANGLE SENSOR
[SUB SIGNAL]

STC-59, "DTC Logic"

C1917

RR ST ANGLE SENSOR
[OFFSET SIG1]

STC-62, "DTC Logic"

C1918

RR ST ANGLE SENSOR
[OFFSET SIG2]

STC-62, "DTC Logic"

C1919

VEHICLE SPEED SEN
[NO SIGNAL]

STC-65, "DTC Logic"

C1920

STEERING ANGLE SEN
[NO SIGNAL]

STC-67, "DTC Logic"

C1921

ENG REV SIGNAL

STC-69, "DTC Logic"

C1922

CONTROL UNIT
[ABNORMAL8]

STC-48, "DTC Logic"

C1923

STEERING ANGLE SEN
[NO CHANGE]

STC-71, "DTC Logic"

C1924

STEERING ANGLE SEN
[NO NEUT STATE]

STC-73, "DTC Logic"

C1925

AD CONVERTER

STC-48, "DTC Logic"

C1926

STEERING ANGLE SEN

STC-75, "DTC Logic"

STC-104

< ECU DIAGNOSIS INFORMATION >

[WITH REAR ACTIVE STEER]

RAS CONTROL UNIT

C1927

CONTROL UNIT
[ABNORMAL5]

STC-42, "DTC Logic"

C1928

CONTROL UNIT
[ABNORMAL9]

STC-48, "DTC Logic"

C1929

VDC

STC-77, "DTC Logic"

C1933

CONTROL UNIT

STC-48, "DTC Logic"

U1000

CAN COMM CIRCUIT

STC-79, "DTC Logic"

U1010

CONTROL UNIT (CAN)

STC-80, "DTC Logic"

DTC

Items (CONSULT screen terms)

Reference