Infiniti Q45. Manual — part 886
TROUBLE DIAGNOSIS
STC-47
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
RAS Control Unit Input/Output Signal Reference Values
NGS0006R
RAS CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Monitor item [Unit]
Content
Condition
Display value
VHCL SPEED SE [km/h] or
[mph]
Wheel speed
Vehicle stopped
0 km/h (0 MPH)
Vehicle running
CAUTION:
Check air pressure of tire under standard
condition.
Approximately equal
to the indication on
speedometer (Inside
of
±
10%)
STEERING ANG [
°
]
Steering angle detected by
steering angle sensor
Steering wheel right turned
0
°
- R756
°
Straight-ahead
Approx. 0
°
Steering wheel left turned
0
°
- L756
°
ENGINE SPEED [rpm]
Engine speed
Engine stopped
0 rpm
Engine running
(Engine speed: 400 rpm or more)
Approximately equal
to the indication on
tachometer
POWER STR SOL [A]
Monitored value of current at
power steering solenoid
valve
Vehicle speed: 0 km/h (0 MPH)
(Engine is running)
Approx. 1.10 A
Vehicle speed: 100 km/h (62 MPH)
Approx. 0.54 A
RR ST ANG-MAI [V]
Rear wheel steering angle
(main) sensor output voltage
RAS actuator assembly turned full right
Approx. 4.4 V
RAS actuator assembly neutral
Approx. 2.4 V
RAS actuator assembly turned full left
Approx. 0.4 V
RR ST ANG-SUB [V]
Rear wheel steering angle
(sub) sensor output voltage
RAS actuator assembly turned full right
Approx. 4.4 V
RAS actuator assembly neutral
Approx. 2.4 V
RAS actuator assembly turned full left
Approx. 0.4 V
RR ST ANG-VOL [V]
Rear wheel steering angle
sensor input voltage
Ignition switch: ON
Approx. 5 V
Ignition switch: OFF
0 V
C/U VOLTAGE [V]
Power supply voltage for
RAS control unit
Ignition switch: ON
Battery voltage
Ignition switch: OFF
—
MOTOR VOLTAGE [V]
Monitored value of voltage
at RAS motor
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
MOTOR CURRENT [A]
Monitored value of current at
RAS motor
During RAS actuator assembly turning
Approx. 0 - 20 A
MTR CRNT OPE [A]
Current commanded value
to RAS motor
During RAS actuator assembly turning
Approx. -20 - 20 A
RR ANGLE OPE [
°
]
Rear wheel steering angle
detected by rear wheel
steering angle sensor
RAS actuator assembly turned full right
Approx. 1
°
RAS actuator assembly neutral
Approx. 0
°
RAS actuator assembly turned full left
Approx. -1
°
STOP LAMP SW [ON/OFF]
Stop lamp condition
Brake pedal: Depressed
ON
Brake pedal: Released
OFF
HICAS RELAY [ON/OFF]
RAS motor relay condition
Ignition switch: ON
ON
Ignition switch: OFF
OFF
FAIL SAFE [ON/OFF]
Fail-safe condition
Fail-safe condition
ON
Normal
OFF
WARNING LAMP [ON/OFF]
RAS warning lamp condition
RAS warning lamp: ON
ON
RAS warning lamp: OFF
OFF
STC-48
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
Specifications Between RAS Unit Terminals
RAS CONTROL UNIT CONNECTOR LAYOUT
Data are reference value and are measured between each terminal and ground.
SGIA1449E
Terminal
Wire
color
Item
Condition
Data (Approx.)
1
L
CAN-H
—
—
4
G
Rear wheel steering angle (main)
sensor output voltage
RAS actuator assembly turned full right
4.4 V
RAS actuator assembly neutral
2.4 V
RAS actuator assembly turned full left
0.4 V
5
W
Power supply
(rear wheel steering angle sensor)
Ignition switch: ON
5 V
Ignition switch: OFF
0 V
7
R
Rear wheel steering angle (sub)
sensor output voltage
RAS actuator assembly turned full right
4.4 V
RAS actuator assembly neutral
2.4 V
RAS actuator assembly turned full left
0.4 V
8
P
CAN-L
—
—
15
B
Ground
(rear wheel steering angle sensor)
Always
0 V
22
L/B
Stop lamp switch
Brake pedal: Depressed
Battery voltage
Brake pedal: Released
0 V
25
L/W
RAS motor relay
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
26
G/W
RAS warning lamp
RAS warning lamp: ON
1.4 V or less
RAS warning lamp: OFF
Ignition voltage:
2.8 V or more
27
GY
Ignition switch
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
34
B
Ground
Always
0 V
36
LG
Power steering solenoid valve
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
L/Y
Power supply
(RAS motor)
Ignition switch: ON
Battery voltage
Ignition switch: OFF
0 V
38
G/Y
RAS motor output voltage
(right)
While RAS motor is operating for right
Battery voltage
While RAS motor is operating for left
0 V
39
G/R
RAS motor output voltage
(left)
While RAS motor is operating for right
0 V
While RAS motor is operating for left
Battery voltage
40
B
Ground
(RAS motor)
Always
0 V
TROUBLE DIAGNOSIS
STC-49
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
CAUTION:
When using a circuit tester to measure voltage for inspection, be sure not to extend forcibly any connector terminals.
CONSULT-II Function (RAS/HICAS)
NGS0006S
FUNCTION
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
CONSULT-II SETTING PROCEDURE
Refer to
GI-36, "CONSULT-II Start Procedure"
.
SELF-DIAG RESULT MODE
Operation Procedure
1.
Perform “CONSULT-II Start Procedure”. Refer to
GI-36, "CONSULT-II Start Procedure"
.
2.
With engine at idle, touch “SELF-DIAG RESULTS”.
Display shows malfunction experienced since the last erasing operation.
NOTE:
The details for “TIME” are as follows:
●
“0”: Error currently detected with active damper suspension control unit.
●
Except for “0”: Error detected in the past and memorized with active damper suspension control unit.
Detects frequency of driving after DTC occurs (frequency of turning ignition switch “ON/OFF”).
Display Item List
Diagnostic test mode
Function
Reference
page
Self-diagnostic results
●
Self-diagnostic results can be read and erased quickly.
Data monitor
●
Input/Output data in the RAS control unit can be read.
CAN diagnostic support monitor
●
The results of transmit/receive diagnosis of CAN communication can be read.
Active test
●
Sends a drive signal to RAS motor to check each sensor operation.
ECU part number
●
RAS control unit part number can be read.
Items
(CONSULT-II screen terms)
Diagnostic item is detected when...
Check item
CONTROL UNIT
[ABNORMAL1]
[C1900]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
CONTROL UNIT
[ABNORMAL2]
[C1901]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
MOTOR OUTPUT
[REV CURRENT]
[C1902]
The current flows in the opposite direction when the RAS motor cur-
rent is output.
STC-57, "DTC C1902,
C1903, C1904, C1910,
C1913 MOTOR OUTPUT"
MOTOR OUTPUT
[NO CURRENT]
[C1903]
The current flows when the RAS motor current is not output.
STC-57, "DTC C1902,
C1903, C1904, C1910,
C1913 MOTOR OUTPUT"
MOTOR OUTPUT
[OVERCURRENT]
[C1904]
The excessive high current flows when the RAS motor current is out-
put.
STC-57, "DTC C1902,
C1903, C1904, C1910,
C1913 MOTOR OUTPUT"
CONTROL UNIT
[ABNORMAL3]
[C1905]
AD converter system of RAS control unit is malfunctioning.
STC-50
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
CONTROL UNIT
[ABNORMAL5]
[C1906]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
CONTROL UNIT
[ABNORMAL4]
[C1907]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
CONTROL UNIT
[ABNORMAL7]
[C1908]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
CONTROL UNIT
[ABNORMAL6]
[C1909]
Malfunction has occurred inside (ignition signal) RAS control unit.
STC-60, "DTC C1909 CON-
TROL UNIT"
MOTOR OUTPUT
[MOTOR LOCK]
[C1910]
When 17A or more current flows to the motor, the rear wheel steering
angle sensor signal does not change for some time.
STC-57, "DTC C1902,
C1903, C1904, C1910,
C1913 MOTOR OUTPUT"
MOTOR VOLTAGE
[LOW VOLTEGE]
[C1911]
The RAS motor power supply voltage is lower than ignition power sup-
ply voltage with RAS motor relay ON.
STC-62, "DTC C1911, C1912
MOTOR VOLTAGE"
MOTOR VOLTAGE
[BAD OBSTRCT]
[C1912]
The RAS motor power supply voltage is inputting for some time with
RAS motor power supply OFF by RAS control unit.
STC-62, "DTC C1911, C1912
MOTOR VOLTAGE"
MOTOR OUTPUT
[ABNORML SIG]
[C1913]
When the RAS motor current value is 10 A or more, actual output is
excessively low and the condition continues for some time.
STC-57, "DTC C1902,
C1903, C1904, C1910,
C1913 MOTOR OUTPUT"
RR ST ANGLE SENSOR
[ABNORML VOL]
[C1914]
Higher or lower value compared to the standard voltage.
STC-67, "DTC C1914,
C1915, C1916, C1917,
C1918 RR ST ANGLE SEN-
SOR"
RR ST ANGLE SENSOR
[MAIN SIGNAL]
[C1915]
The rear wheel steering angle sensor (main) input signal is malfunc-
tioning for some time against the sensor power supply value.
STC-67, "DTC C1914,
C1915, C1916, C1917,
C1918 RR ST ANGLE SEN-
SOR"
RR ST ANGLE SENSOR
[SUB SIGNAL]
[C1916]
When the main sensor input signal is 2.4 - 2.6 V, the rear wheel steer-
ing angle sensor (sub) input signal is malfunctioning for some time
compared to the sensor power supply value.
STC-67, "DTC C1914,
C1915, C1916, C1917,
C1918 RR ST ANGLE SEN-
SOR"
RR ST ANGLE SENSOR
[OFFSET SIG1]
[C1917]
An excessive difference has occurred in the input values of rear wheel
steering angle sensor (main) and rear wheel steering angle sensor
(sub).
STC-67, "DTC C1914,
C1915, C1916, C1917,
C1918 RR ST ANGLE SEN-
SOR"
RR ST ANGLE SENSOR
[OFFSET SIG2]
[C1918]
An excessive difference has occurred in the input values of rear wheel
steering angle sensor (main) and rear wheel steering angle sensor
(sub).
STC-67, "DTC C1914,
C1915, C1916, C1917,
C1918 RR ST ANGLE SEN-
SOR"
VEHICLE SPEED SEN
[NO SIGNAL]
[C1919]
●
Malfunction is detected in vehicle speed signal that is output from
VDC/TCS/ABS control unit through CAN communication.
●
Improper signal is input while driving.
STC-72, "DTC C1919 VEHI-
CLE SPEED SEN"
STEERING ANGLE SEN
[NO SIGNAL]
[C1920]
No steering angle signal is input for some time.
STC-72, "DTC C1920,
C1923, C1924, C1926
STEERING ANGLE SEN"
Items
(CONSULT-II screen terms)
Diagnostic item is detected when...
Check item
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