Infiniti Q45. Manual - part 887

 

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Infiniti Q45. Manual - part 887

 

 

TROUBLE DIAGNOSIS

STC-51

[WITH REAR ACTIVE STEER]

C

D

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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.

STC-74, "DTC C1929 VDC"

CAN COMM
[U1000]

Malfunction has been detected from CAN communication line.

STC-75, "DTC U1000 CAN 
COMM"

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 

STC-49, "Display Item List"

 .

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]

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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"

STC-56, 

"DTC C1925 AD CON-
VERTER"

  or 

STC-60, 

"DTC C1909 CON-
TROL UNIT"

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.

STC-74, "DTC C1929 
VDC"

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.

STC-80, "Stop Lamp 
Switch"

 

 

 

 

 

 

 

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