Infiniti Q45. Manual — part 887
TROUBLE DIAGNOSIS
STC-51
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
How to Erase Self-diagnostic Results
1.
Perform applicable inspection of malfunctioning item and then repair or replace.
2.
Start engine and select “SELF-DIAG RESULTS” mode for “RAS/HICAS” with CONSULT-II.
3.
Touch “ERASE” on CONSULT-II screen to erase DTC memory.
CAUTION:
If memory cannot be erased, perform applicable diagnosis.
DATA MONITOR MODE
Operation Procedure
1.
Perform “CONSULT-II Start Procedure”. Refer to
GI-36, "CONSULT-II Start Procedure"
.
2.
Touch “DATA MONITOR”.
3.
Select from “SELECT MONITOR ITEM”, screen of data monitor mode is displayed.
NOTE:
When malfunction is detected, CONSULT-II performs REAL-TIME DIAGNOSIS.
Also, any malfunction detected while in this mode will be displayed in real time.
ENG REV SIGNAL
[C1921]
●
Malfunction is detected in engine speed signal that is output from
ECM through CAN communication.
●
Improper signal is input engine speed.
STC-73, "DTC C1921 ENG
REV SIGNAL"
CONTROL UNIT
[ABNORMAL8]
[C1922]
Malfunction is detected in the memory (EEPROM) system of RAS con-
trol unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
STEERING ANGLE SEN
[NO CHANGE]
[C1923]
While driving at 60 km/h (37 MPH) or more, steering angle does not
change for a while.
STC-72, "DTC C1920,
C1923, C1924, C1926
STEERING ANGLE SEN"
STEERING ANGLE SEN
[NO NEUT STATE]
[C1924]
When driving some distance, no neutral signal (ON signal) is input.
STC-72, "DTC C1920,
C1923, C1924, C1926
STEERING ANGLE SEN"
AD CONVERTER
[C1925]
AD converter system of RAS control unit is malfunctioning.
STC-56, "DTC C1925 AD
CONVERTER"
STEERING ANGLE SEN
[C1926]
●
Malfunction is detected in steering angle sensor signal that is output
from steering angle sensor through CAN communication.
●
Improper signal is input steering angle sensor.
STC-72, "DTC C1920,
C1923, C1924, C1926
STEERING ANGLE SEN"
CONTROL UNIT
[ABNORMAL5]
[C1927]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
CONTROL UNIT
[ABNORMAL9]
[C1928]
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CONTROL
UNIT"
VDC
[C1929]
●
Malfunction is detected in VDC malfunction signal that is output from
VDC/TCS/ABS control unit through CAN communication.
●
VDC/TCS/ABS control unit outputs the malfunction signal.
●
Improper signal is input VDC malfunction signal.
CAN COMM
[U1000]
Malfunction has been detected from CAN communication line.
CONTROL UNIT (CAN)
[U1010]
Malfunction is detected by RAS control unit internal malfunction.
STC-75, "DTC U1010 CON-
TROL UNIT (CAN)"
Items
(CONSULT-II screen terms)
Diagnostic item is detected when...
Check item
STC-52
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
Display Item List
ACTIVE TEST MODE
Description
Use this mode to determine and identify the details of a malfunction based on self-diagnostic results or data
monitor. RAS control unit gives drive signal to RAS actuator assembly with receiving command from CON-
SULT-II to check operation of RAS actuator assembly.
Operation Procedure
1.
Perform “CONSULT-II Start Procedure”. Refer to
GI-36, "CONSULT-II Start Procedure"
2.
Lift UP (when four tires are not on ground).
3.
Make sure that no DTC is detected. Refer to
STC-49, "SELF-DIAG RESULT MODE"
.
NOTE:
If DTC is detected, perform “ACTIVE TEST” after check and repair. Refer to
4.
Touch “ACTIVE TEST”.
5.
Select “MAIN SIGNALS” or “SELECTION FROM MENU”, and then press “START”.
CAUTION:
Perform while the wheel rotation stops.
Monitored item (Unit)
Remarks
VHCL SPEED SE [km/h] or [mph]
Vehicle speed received via CAN communication is displayed.
STEERING ANG [
°
]
Steering angle received via CAN communication is displayed.
ENGINE SPEED [rpm]
Engine speed received via CAN communication is displayed.
POWER STR SOL [A]
Power steering solenoid controlling current that RAS control unit outputs is displayed.
RR ST ANG-MAI [V]
Rear wheel steering angle main sensor output voltage is displayed.
RR ST ANG-SUB [V]
Rear wheel angle sub sensor output voltage is displayed.
RR ST ANG-VOL [V]
Voltage supplied from RAS control unit to rear wheel steering angle sensor is displayed.
C/U VOLTAGE [V]
Voltage supplied to RAS control unit is displayed.
MOTOR VOLTAGE [V]
Voltage supplied from RAS control unit to RAS motor is displayed.
MOTOR CURRENT [A]
RAS motor relay controlling current that RAS control unit outputs is displayed.
MTR CRNT OPE [A]
Current commanded value to RAS motor is displayed.
RR ANGLE OPE [
°
]
Angle commanded value to rear wheel steering angle sensor is displayed.
STOP LAMP SW [ON/OFF]
Condition of stop lamp switch ON/OFF is displayed.
HICAS RELAY [ON/OFF]
RAS motor relay ON/OFF condition is displayed.
FAIL SAFE [ON/OFF]
Fail-safe ON/OFF condition is displayed.
WARNING LAMP [ON/OFF]
RAS warning lamp operating condition is displayed.
Voltage [V]
The value measured by the voltage probe is displayed.
Frequency [Hz]
The value measured by the pulse probe is displayed.
DUTY-HI (high) [%]
DUTY-LOW (low) [%]
PLS WIDTH-HI [msec]
PLS WIDTH-LOW [msec]
TROUBLE DIAGNOSIS
STC-53
[WITH REAR ACTIVE STEER]
C
D
E
F
H
I
J
K
L
M
A
B
STC
6.
Start “ACTIVE TEST” after pressing “ON” (
) in the indicator.
7.
Operate with the following:
●
When turning the steering wheel right or left, the rear wheel
turns in the same direction.
●
Steering wheel is not turned, the rear wheel turns left and right
5 times.
RAS CONTROL UNIT PART NUMBER MODE
Ignore the RAS control unit part number displayed in the “ECU PART NUMBER”.
Refer to parts catalog to order the RAS control unit.
Self-Diagnostic Procedure
NGS0006T
SELF-DIAGNOSTIC PROCEDURE (WITH CONSULT-II)
Refer to
STC-49, "SELF-DIAG RESULT MODE"
.
SELF-DIAGNOSTIC PROCEDURE (WITHOUT CONSULT-II)
Description
The RAS warning lamp in the combination meter will flicker according to the self-diagnostic results. As for the
details of the RAS warning lamp flickering patterns, refer to
STC-53, "Diagnostic Procedure"
Diagnostic Procedure
1.
Start engine.
2.
Perform the following procedure within 10 seconds after engine start.
●
Turn steering wheel left and right at 20
°
or more and 5 times
●
Depress the brake pedal 5 times or more
3.
Read the flickering of RAS warning lamp. Refer to
STC-53, "Judgement Self-diagnosis"
.
NOTE:
When the RAS warning lamp flashes 4 Hz and continues repeating it, the system is normal.
Judgement Self-diagnosis
When a malfunction is detected, the malfunction route is indicated by flickering of the RAS warning lamp.
NOTE:
When the RAS warning lamp flashes 4 Hz and continues repeating it, the system is normal.
Monitored item
Active test “ON”
STEERING ANG
0
°
(Neutral)
R 90
°
L90
°
RR ST ANG-MAI
2.4 V
Approx. 4.4 V
Approx. 0.4 V
RR ST ANG-SUB
2.4 V
Approx. 4.4 V
Approx. 0.4 V
MOTOR CURRENT
No output
(Approx. 0 A)
Output (change)
SGIA1451E
SGIA1453E
STC-54
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
ERASE SELF-DIAGNOSIS
●
In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is
stored into the control unit as necessary during use by the user. This memory is not erased no matter how
many times the ignition switch is turned ON and OFF.
●
However, this information is erased by turning ignition switch “OFF” after performing self-diagnostics or by
erasing the memory using the CONSULT-II. Refer to
STC-40, "How to Perform Trouble Diagnosis"
Flickering pattern
Items
Diagnostic item is detected when...
Check item
11
RAS control unit
Malfunction has occurred inside RAS control unit.
STC-56, "DTC C1900,
C1901, C1905, C1906,
C1907, C1908, C1922,
C1927, C1928 CON-
TROL UNIT"
or
12
Motor power supply
Battery voltage circuit malfunction of RAS motor
STC-62, "DTC C1911,
C1912 MOTOR VOLT-
AGE"
13
Motor output
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 OUT-
PUT"
21
Vehicle speed signal
●
Malfunction is detected in vehicle speed signal that
is output from VDC/TCS/ABS control unit through
CAN communication.
●
Improper signal is input vehicle speed.
STC-72, "DTC C1919
VEHICLE SPEED SEN"
22
Steering angle sensor signal
●
Malfunction is detected in steering angle sensor
signal that is output from steering angle sensor
through CAN communication.
●
Improper signal is input steering angle sensor.
STC-72, "DTC C1920,
C1923, C1924, C1926
STEERING ANGLE
SEN"
24
Rear wheel steering angle
(main)
The rear wheel steering angle sensor (main) input
signal is malfunctioning for some time against the
sensor power supply value.
STC-67, "DTC C1914,
C1915, C1916, C1917,
C1918 RR ST ANGLE
SENSOR"
25
Rear wheel steering angle
(sub)
When the main sensor input signal is 2.4 - 2.6 V, the
rear wheel steering 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
SENSOR"
26
VDC
●
Malfunction is detected in VDC malfunction signal
that is output from VDC/TCS/ABS control unit
through CAN communication.
●
VDC/TCS/ABS control unit outputs the malfunction
signal.
●
Improper signal is input VDC malfunction signal.
33
Engine speed signal
●
Malfunction is detected in engine speed signal that
is output from ECM through CAN communication.
●
Improper signal is input engine speed.
STC-73, "DTC C1921
ENG REV SIGNAL"
No flickering
Stop lamp switch
Stop lamp switch circuit is shorted or open.
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