Infiniti Q45. Manual — part 884
REAR ACTIVE STEER SYSTEM
STC-39
[WITH REAR ACTIVE STEER]
C
D
E
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H
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STC
COMPONENTS FUNCTION DESCRIPTION
CAN Communication
NGS00072
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
For details, refer to
Component parts
Function
RAS control unit
Controls power steering solenoid valve and RAS actuator assembly (with fail-safe function).
Power steering solenoid valve
Controls oil pressure in gear housing assembly.
RAS actuator assembly
Moves the rear wheel angle.
Rear wheel steering angle sensor
Transmits RAS actuator assembly condition to RAS control unit.
RAS motor
Operates RAS actuator assembly.
RAS warning lamp
Illuminates if malfunction is detected in electrical system of rear active steer system.
Stop lamp switch
Detects status of brake pedal depressed.
Steering angle sensor
Transmits steering angle sensor signal via CAN communication to RAS control unit.
ECM
Transmits engine speed signal via CAN communication to RAS control unit.
VDC/TCS/ABS control unit
Transmits the following signals via CAN communication to RAS control unit.
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Vehicle speed signal
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VDC malfunction signal
STC-40
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS
PFP:00004
Fail-Safe Function
NGS0006L
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If any malfunction occurs in rear active steer system, and control unit detects the malfunction, RAS warn-
ing lamp on combination meter turns ON to indicate system malfunction.
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Stops the rear wheel control when the RAS warning lamp is turned ON.
●
The fail-safe function of vehicle speed signal operate to regulate
power steering solenoid valve operation in response to engine
speed, thereby maintaining the required power steering force.
How to Perform Trouble Diagnosis
NGS0006M
BASIC CONCEPT
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To perform trouble diagnosis, it is the most important to have understanding about vehicle systems (con-
trol and mechanism) thoroughly.
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It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptoms, and understand them fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptoms by driving vehicle with
customer.
CAUTION:
Customers are not professional. It is dangerous to make an
easy guess like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.
●
It is essential to check symptoms right from the beginning in
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on
interview with customer and past examples. Do not perform
inspection on ad hoc basis. Most intermittent malfunctions are
caused by poor contacts. In this case, it will be effective to shake
suspected harness or connector by hand. When repairing with-
out any symptom diagnosis, you cannot judge if malfunctions
have actually been eliminated.
●
After completing diagnosis, always erase diagnostic memory.
Refer to
STC-54, "ERASE SELF-DIAGNOSIS"
●
For intermittent malfunctions, move harness or harness connec-
tor by hand. Then check for poor contact or reproduced open circuit.
SST697CB
SEF233G
SEF234G
TROUBLE DIAGNOSIS
STC-41
[WITH REAR ACTIVE STEER]
C
D
E
F
H
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K
L
M
A
B
STC
Component Parts Location
NGS0006O
SGIA1448E
STC-42
[WITH REAR ACTIVE STEER]
TROUBLE DIAGNOSIS
Circuit Diagram
NGS00073
TGWM0065E
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