Infiniti M35/M45 Y50. Manual - part 1118

TROUBLE DIAGNOSIS

STC-29

[RAS]

STC

How to Erase Self-Diagnostic Results

Perform applicable inspection of malfunctioning item and then repair or replace.

Start engine, and touch “START (NISSAN BASED VHCL)” “RAS/HICAS” “SELF-DIAG RESULTS” and
“ERASE” in this order to erase the diagnostic memory.

CAUTION:

If memory cannot be erased, repeat step 1, 2.

Perform self-diagnosis again, and make sure that DTC memory is erased.

C1910

MOTOR OUTPUT [MOTOR LOCK]

When 17 A or more current flows to
the motor, the rear wheel steering
angle sensor signal does not
change for some time.

STC-37

C1919

VEHICLE SPEED SEN [NO SIGNAL]

No vehicle speed signal is input for
some time.

STC-38

C1900

CONTROL UNIT [ABNORMAL1]

Control unit malfunction

STC-35

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]

C1927

CONTROL UNIT [ABNORMAL5]

C1928

CONTROL UNIT [ABNORMAL9]

C1920

STEERING ANGLE SEN [NO SIGNAL]

No steering angle signal is input for
some time.

STC-39

C1926

STEERING ANGLE SEN

●

An unexpected signal is input.

●

Steering angle sensor outputs the
malfunction signal.

STC-39

C1929

VDC

ABS actuator and electric unit (con-
trol unit) outputs the malfunction
signal.

STC-43

U1000

CAN COMM CIRCUIT

When a RAS control unit is not
transmitting or receiving CAN com-
munication signal 2 seconds or
more.

STC-44

U1010

CONTROL UNIT (CAN)

When detecting error during the ini-
tial diagnosis of CAN controller of
RAS control unit.

STC-44

DTC

Diagnostic item

Diagnostic item is detected when...

Check items

STC-30

[RAS]

TROUBLE DIAGNOSIS

DATA MONITOR MODE
Operation Procedure

Perform “CONSULT-II Start Procedure”. Refer to

GI-38, "CONSULT-II Start Procedure"

Touch “DATA MONITOR”.

Select from “SELECT MONITOR ITEM”, screen of data monitor 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.

Display Item List

ACTIVE TEST MODE
Operation Procedure

Perform “CONSULT-II Start Procedure”. Refer to

GI-38, "CONSULT-II Start Procedure"

When turning the steering wheel right or left, the rear wheel turns in the same direction. If the steering
wheel is not turned, the rear wheel turns left and right 5 times.

RAS CONTROL UNIT PART NUMBER

Perform “CONSULT-II Start Procedure”. Refer to

GI-38, "CONSULT-II Start Procedure"

The part number described on RAS control unit sticker is displayed.

Item [Display or 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 dis-
played.

RR ST ANG-SUB [V]

Rear wheel steering 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.

MOTOR CRNT OPE [A]

Current commanded value to RAS motor is displayed.

RR ANG 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.

FAILSAFE [ON/OFF]

Fail-safe ON/OFF condition is displayed.

WARNING LAMP [ON/OFF]

RAS warning lamp operating condition is displayed.

STEERING ANG

RR ST ANG MAI

RR ST ANG SUB

MOTOR CURRENT

(Neutral)

2.4 V

No output (Approx. 0 A)

R 90

Approx. 4.4 V

Output (change)

L 90

Approx. 0.4 V

TROUBLE DIAGNOSIS

STC-31

[RAS]

STC

Diagnosis Procedure with Self-Diagnosis Function (Without CONSULT-II)

NGS000EL

DESCRIPTION

If a malfunction is detected in the system, the RAS warning lamp turns on and indicates the malfunction. At
that time, fail-safe activates, and then stops the function.

SELF-DIAGNOSIS PROCEDURE

Start engine.

Turn steering wheel left and right at 20

or more and 5 times or more within 10 seconds. And then depress

the service brake 5 times or more.

RAS warning lamp blinks (displays normal/malfunction).

SELF-DIAGNOSIS DISPLAY

RAS warning lamp blinks and displays the self-diagnostic results.

●

Only DTCs are displayed as the pattern shown in the figure, and
then repeat the display.

●

If all items are normal, RAS warning lamp blinks at 4 Hz cycle.

SELF-DIAGNOSIS DISPLAY ITEMS

HOW TO ERASE SELF-DIAGNOSIS

If there is the history data for when the fail-safe has activated in the past, erase the memory with CONSULT-II.
Refer to

STC-29, "How to Erase Self-Diagnostic Results"

CAN Communication

NGS000EM

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. Refer to

LAN-50, "CAN Sys-

tem Specification Chart"

SGIA1243E

DTC (warning lamp blinks)

Diagnosis item

Inspection item

RAS control unit

STC-35, "Inspection 1: RAS Control Unit Malfunction"

Motor power supply

STC-35, "Inspection 2: Motor Power Supply System"

Motor output

STC-37, "Inspection 3: RAS Motor Output Malfunction"

Vehicle speed signal

STC-38, "Inspection 4: Vehicle Speed Signal"

Steering angle signal

STC-39, "Inspection 5: Steering Angle Signal Malfunction"

Rear wheel steering angle (main)

STC-40, "Inspection 6: Rear Main Signal and Rear Sub Signal
Malfunction"

Rear wheel steering angle (sub)

STC-40, "Inspection 6: Rear Main Signal and Rear Sub Signal
Malfunction"

VDC

STC-43, "Inspection 7: VDC Malfunction"

Engine speed signal

STC-44, "Inspection 8: Engine Speed Signal Malfunction"

STC-32

[RAS]

TROUBLE DIAGNOSIS

For Fast and Accurate Trouble Diagnosis

NGS000EN

Check the following items with the vehicle stopped

●

Is air pressure and size of tires proper?

●

Is the specified part used for the steering wheel?

●

Is control unit a genuine part?

●

Are there any fluid leakage from steering gear assembly, power steering oil pump, and hydraulic pipes,
etc? Refer to

PS-8, "Checking Fluid Leakage"

●

Is the fluid level proper? Refer to

PS-8, "Checking Fluid Level"

●

Is the wheel alignment is adjusted properly? Refer to

FSU-6, "Wheel Alignment Inspection"

(2WD),

FSU-

24, "Wheel Alignment Inspection"

(AWD).

●

Are there any damage or modification to suspension or body resulting in increased weight or altered
ground clearance?

●

Check each link installation condition of suspension and axle.

●

Is the battery voltage proper?

●

Check each connector connection condition.

Check the following items while driving the vehicle

●

Conditions when the error occurred (5W 1H).

●

Is the engine is normal?

Basic Inspection

NGS000EO

BASIC INSPECTION 1: POWER SUPPLY CIRCUIT TERMINAL LOOSENESS AND BATTERY

Check battery terminals for looseness on both positive and negative ones and ground connection. Also make
sure that battery voltage does not drop.

BASIC INSPECTION 2: RAS WARNING LAMP INSPECTION

Make sure RAS warning lamp turns on when ignition switch is turned ON.

●

If it does not turn on, refer to

STC-33, "Trouble Diagnosis Chart"

Make sure that RAS warning lamp turns off when the engine is started after ignition switch is turned ON. If
it does not turn off, perform self-diagnosis. Refer to

STC-28, "SELF-DIAG RESULT MODE"

Always erase DTC memory after completing self-diagnosis. Refer to

STC-29, "How to Erase Self-Diag-

nostic Results"

BASIC INSPECTION 3: RAS CONTROL UNIT POWER SUPPLY CIRCUIT AND GROUND CIR-
CUIT INSPECTION

CHECK RAS CONTROL UNIT CONNECTOR

Turn ignition switch OFF, disconnect RAS control unit harness connector, and check terminal for deformation,
disconnection, looseness, etc.

OK or NG

>> GO TO 2.

>> Poor connection of connector terminal. Repair or replace the terminal.

CHECK RAS CONTROL UNIT GROUND CIRCUIT

Disconnect RAS control unit harness connector B476, and then
check continuity between RAS control unit harness connector
B476 and ground.