2006 INFINITI M35 power steering

STC-10
[EPS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
3. CHECK POWER STEERING CONTROL UNIT POWER SUPPLY CIRCUIT
Turn ignition switch ON, and then check voltage between power
steering control unit harness connector M8 and ground.
OK or NG
OK >> Power supply and ground circuit are normal.
NG >> Power supply circuit open or shorted. Repair or replace
any inoperative parts.
Symptom: The Steering Force Does Not Change Smoothly According to the
Vehicle Speed
NGS000E4
Heavy steering force with the static steering/light steering force during high-speed driving
1. POWER STEERING SOLENOID VALVE SIGNAL INSPECTION 1
1. Start engine.
2. Change the vehicle speed from 0 to 100 km/h (0 to 62 MPH)
slowly, and then check voltage between power steering control
unit harness connector M8 and ground.
OK or NG
OK >> GO TO 2.
NG >> GO TO 7.
2. POWER STEERING SOLENOID VALVE SIGNAL INSPECTION 2
1. Activate fail-safe function by running the engine speed at 1,500 rpm or higher for 10 seconds with the
vehicle stopped.
2. Change the engine speed to the idling, to approximately 1,600
rpm, and to approximately 3,000 rpm slowly, and then check
voltage between power steering control unit harness connector
M8 and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 8.
3. CHECK POWER STEERING SOLENOID VALVE CONNECTOR
Turn ignition switch OFF, disconnect power steering solenoid valve harness connector, and check terminal for
deformation, disconnection, looseness, etc.
OK or NG
OK >> GO TO 4.
NG >> Harness or connector open or shorted. Repair or replace any inoperative parts. Terminal 1 – ground : Battery voltage (Approx. 12 V)
SGIA1232E
Terminal 7 – ground : The voltage has changed from
approximately 4.4 - 6.6 V to
approximately 2.4 - 3.6 V
SGIA1233E
Terminal 7 – ground : The voltage has changed from
approximately 5.5 V to approxi-
mately 2.1 V step-by-step.
SGIA1233E

TROUBLE DIAGNOSIS
STC-11
[EPS]
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STC
Revision: 2006 January2006 M35/M45
4. CHECK POWER STEERING SOLENOID VALVE POWER SUPPLY CIRCUIT
Check continuity between power steering control unit harness con-
nector M8 and power steering solenoid valve harness connector F25
(VQ35DE), E211 (VK45DE).
OK or NG
OK >> GO TO 5.
NG >> Open or short in harness. Repair or replace any inoper-
ative parts.
5. CHECK POWER STEERING SOLENOID VALVE GROUND CIRCUIT
Check continuity between power steering solenoid valve harness
connector F25 (VQ35DE), E211 (VK45DE) and ground.
OK or NG
OK >> GO TO 6.
NG >> Open or short in harness. Repair or replace any inoper-
ative parts.
6. CHECK POWER STEERING SOLENOID VALVE
Apply voltage power steering solenoid valve connector, and then
make sure that the operating sound (clicking sound) is heard.
OK or NG
OK >> Perform steering turning torque inspection. Refer to PS-
10, "CHECKING STEERING WHEEL TURNING
FORCE" .
NG >> Power steering solenoid valve is inoperative. Replace.
Power steering control unit Power steering solenoid valve Continuity
Terminal 7 Terminal 1 Yes
SGIA1235E
Terminal 2 – Ground : Continuity exist.
SGIA1236E
Terminal 1 (+) - 2 (–) : Operating sound is heard.
SGIA1284E

STC-12
[EPS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
7. CHECK VEHICLE SPEED SIGNAL CIRCUIT
Change the vehicle speed, and then check voltage waveform
between power steering control unit harness connector M8 and
ground.
OK or NG
OK >> Power steering control unit is inoperative. Replace.
NG >> Check the following systems and replace if necessary.
Harness between unified meter & A/C amp and power steering control unit.
Unified meter & A/C amp and vehicle speed signal circuit Refer to DI-28, "UNIFIED METER
AND A/C AMP" .
8. CHECK ENGINE SPEED SIGNAL CIRCUIT
Warm up the engine, and then check voltage waveform between
power steering control unit harness connector M8 and ground when
the engine speed is the idling and at approximately 2,000 rpm.
OK or NG
OK >> Power steering control unit is inoperating. Replace it.
NG >> Check the following systems and replace if malfunction is detected.
Harness between ECM and power steering control unit
ECM engine speed signal circuit. Refer to EC-846, "CONSULT-II Function (ENGINE)" .
Terminal 3 – GroundRepeat Approx. 0 V and approx. 5 V
SGIA1237EELF1080D
Terminal 5 – GroundAt Idle
Approx. 2,000 rpmSGIA1289EPBIA3654J
PBIA3655J

TROUBLE DIAGNOSIS
STC-27
[RAS]
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Revision: 2006 January2006 M35/M45
STANDARD BY CONSULT-II
CAUTION:
The output signal indicates the RAS control unit calculation data. The normal values will be displayed
even in the event that the output circuit (harness) is open.
Monitor itemDATA MONITOR
Malfunction inspection
checklist
Condition Reference values
VHCL SPEED SE (km/h)Ignition switch ON or engine
running Almost in accordance with the speed-
ometer display. It is not a malfunction,
through it might not be corresponding
just after ignition switch is turned ON.STC-38, "
Inspection 4:
Vehicle Speed Signal"
STEERING ANG ()Turning steering wheel clock-
wise or counterclockwise.Displays the angle when the steering
wheel turns from the neutral positionSTC-38, "
Inspection 5:
Steering Angle Signal
Malfunction"
ENGINE SPEED (rpm) Engine runningAlmost in accordance with tachometer
displaySTC-43, "
Inspection 8:
Engine Speed Signal
Malfunction"
POWER STR SOL (A)Accelerate the vehicle from 0
to 100 km/h (0 to 62 MPH)0 km/h (0 MPH): Approx. 1.10 A
100 km/h (62 MPH): Approx. 0.54 ASTC-46, "Diagnosis
Chart by Symptom 2"
RR ST ANG-MAI (V)
Perform the ACTIVE TEST
and stroke the actuator (with
tires off the ground)Neutral: Approx. 2.4 V
Turn steering wheel to right for full
stroke: Approx. 4.4 V
Turn steering wheel to left for full
stroke: Approx. 0.4 VSTC-40, "Inspection 6:
Rear Main Signal and
Rear Sub Signal Mal-
function"RR ST ANG- SUB (V)
RR ST ANG-VOL (V)
Ignition switch ON or engine
runningApprox. 5 VSTC-40, "
Inspection 6:
Rear Main Signal and
Rear Sub Signal Mal-
function"
C/U VOLTAGE (V) Battery voltage (Approx. 12 V)STC-35, "
Inspection 1:
RAS Control Unit Mal-
function"
MOTOR VOLTAGE (V) Battery voltage (Approx. 12V)STC-35, "
Inspection 2:
Motor Power Supply
System"
MOTOR CURRENT (A)Perform the ACTIVE TEST
and stroke the actuator.It is normal when there is the current
output at strokeSTC-35, "
Inspection 2:
Motor Power Supply
System"
MTR CRNT OPE (A)Turning steering wheel clock-
wise or counterclockwise
while ignition switch is ON or
running the engineNeutral (Steering force is zero and
straight-ahead position): Approx. 0 A
The value is changed according to
steering left or right STC-37, "
Inspection 3:
RAS Motor Output
Malfunction"
STOP LAMP SWDepressing or releasing brake
pedalBrake pedal depressed: ONSTC-44, "
Inspection
10: Stop Lamp Switch
Harness"Brake pedal not depressed: OFF
RAS RELAY
Ignition switch ON or engine
runningIgnition switch ON: ONSTC-35, "
Inspection 2:
Motor Power Supply
System"
FAIL SAFE Not activatedSelf-diagnosis and
suspect system
inspection on DATA
MONITOR
WARNING LAMP (ON/OFF)RAS warning lamp ON: ON
RAS warning lamp OFF: OFFWarning lamp circuit
inspection

STC-28
[RAS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
CONSULT-II Function (RAS)NGS000EG
FUNCTION
CONSULT-II can display each self-diagnostic item using the diagnostic test modes shown following.
CONSULT-II SETTING PROCEDURE
Refer to GI-39, "CONSULT-II Start Procedure" .
SELF-DIAG RESULT MODE
Operation Procedure
1. Perform “CONSULT-II Start Procedure”. Refer to GI-39, "CONSULT-II Start Procedure" .
2. Touch “PRINT” to print out the self-diagnostic results if necessary. Check RAS warning lamp if “NO FAIL-
URE” is displayed.
3. Perform the appropriate inspection from the display item list, and repair or replace the malfunctioning
component. Refer to STC-28, "
Display Item List" .
Display Item List
CAUTION:
When malfunctions are detected in several systems, including the “CAN COMM [U1000]” and
“CONTROL_UNIT (CAN) [U1010]”, inspect the CAN communication system.
Mode Function Reference
SELF-DIAG RESULTSReceives self-diagnosis results from RAS control unit and
indicates DTCs.STC-28, "
SELF-DIAG RESULT
MODE"
DATA MONITORReceives input/output signals from RAS control unit and
indicates and stores them to facilitate locating cause of
malfunctions.STC-30, "DATA MONITOR MODE"
CAN DIAG SUPPORT MNTRMonitors transmitting/receiving status of CAN communi-
cation.STC-31, "CAN Communication"
ACTIVE TESTSends command to RAS actuator to change output sig-
nals and check operation of output system.STC-30, "ACTIVE TEST MODE"
ECU PART NUMBER Displays RAS control unit part number.STC-30, "RAS CONTROL UNIT
PART NUMBER"
DTC code Diagnostic item Diagnostic item is detected when... Check items
C1923 STEERING_ANGLE_SEN [NO_CHANGE] (ꞏ a)While driving at 60 km/h (37 MPH)
or more, steering angle does not
change for a while.STC-38
C1924 STEERING_ANGLE_SEN [NO_NEUT_STATE] (ꞏ b)When driving some distance, no
neutral signal (ON signal) is input.STC-38
C1915 RR_ST_ANGLE_SENSOR [MAIN_SIGNAL] (ꞏ a)The main sensor input signal is
malfunctioning for some time
against the sensor power supply
value.STC-40
C1916 RR_ST_ANGLE_SENSOR [SUB_SIGNAL] (ꞏ b)When the main sensor input signal
is 2.4 - 2.6 V, the sub sensor input
signal is malfunctioning for some
time compared to the sensor power
supply value.STC-40
C1917, C1918 RR_ST_ANGLE_SENSOR [OFFSET_SIG1,2] (ꞏ c)An excessive difference has
occurred in the input values of main
sensor and sub sensor.STC-40
C1914 RR_ST_ANGLE_SENSOR [ABNORMAL_VOL] (ꞏ d)Higher or lower value compared to
the standard voltage.STC-40
C1921 MOTOR_OUTPUTNo engine speed is input for a cer-
tain time.STC-43
C1911 MOTOR_VOLTAGE [LOW_VOLTAGE] (ꞏ a)The motor power supply voltage is
lower than ignition power supply
voltage with RAS motor relay ON.STC-35

TROUBLE DIAGNOSIS
STC-29
[RAS]
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Revision: 2006 January2006 M35/M45
How to Erase Self-Diagnostic Results
1. Perform applicable inspection of malfunctioning item and then repair or replace.
2. 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.
3. Perform self-diagnosis again, and make sure that DTC memory is erased.
C1912 MOTOR_VOLTAGE [BAD_OBSTRCT] (ꞏ b)The motor power supply voltage is
inputting for some time with motor
power supply OFF by RAS control
unit.STC-35
C1913 MOTOR_OUTPUT [ABNORMAL_SIG] (ꞏ a)When the motor current value is
10A or more, actual output is
excessively low and the condition
continues for some time.STC-37
C1902 MOTOR_OUTPUT [REV_CURRENT] (ꞏ c)The current flows in the opposite
direction when the motor current is
output. STC-37
C1903 MOTOR_OUTPUT [NO_CURRENT] (ꞏ d)The current flows when the motor
current is not output. STC-37
C1904 MOTOR_OUTPUT [OVERCURRENT] (ꞏ e)The excessive high current flows
when the motor current is output.STC-37
C1910 MOTOR_OUTPUT [MOTOR_LOCK] (ꞏ b)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 - 9] Control unit malfunctionSTC-35
C1901
C1905
C1906
C1907
C1908
C1909
C1922
C1928
C1920 STEERING_ANGLE_SEN [NO_SIGNAL]No steering angle signal is input for
some time.STC-38
C1926 STEERING_ANGLE_SEN
An unexpected signal is input.
Steering angle sensor outputs the
malfunction signal.STC-38
C1929 VDCABS actuator and electric unit (con-
trol unit) outputs the malfunction
signal.STC-42
U1000 CAN COMM CIRCUITWhen a control unit (except for
RAS) is not transmitting or receiving
CAN communication signal 2 sec-
onds or less.STC-43
U1010 CONTROL_UNIT [CAN]When detected error during the ini-
tial diagnosis of CAN controller of
each control unit.STC-43
DTC code Diagnostic item Diagnostic item is detected when... Check items

STC-30
[RAS]
TROUBLE DIAGNOSIS
Revision: 2006 January2006 M35/M45
DATA MONITOR MODE
Operation Procedure
1. Perform “CONSULT-II Start Procedure”. Refer to GI-39, "CONSULT-II Start Procedure" .
2. Touch “DATA MONITOR”.
3. 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
1. Perform “CONSULT-II Start Procedure”. Refer to GI-39, "CONSULT-II Start Procedure" .
2. 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
1. Perform “CONSULT-II Start Procedure”. Refer to GI-39, "CONSULT-II Start Procedure" .
2. The part number described on RAS control unit sticker is displayed.
Item (Display or Unit) Remarks
VHCL SPEED SE (km/h) 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 dis-
played.
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.
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
0
(Neutral) 2.4 V 2.4 V No output (Approx. 0 A)
R 90
Approx. 4.4 V Approx. 4.4 V
Output (change)
L 90
Approx. 0.4 V Approx. 0.4 V

TROUBLE DIAGNOSIS
STC-31
[RAS]
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Revision: 2006 January2006 M35/M45
Diagnosis Procedure with Self-Diagnosis Function (Without CONSULT- I I )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
1. Start engine.
2. 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.
3. 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 CommunicationNGS000EM
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. Refer to LAN-34, "
CAN
Communication Unit" .
SGIA1243E
DTC (warning lamp blinks) Diagnosis item Inspection item
11 RAS control unitSTC-35, "
Inspection 1: RAS Control Unit Malfunction"
12 Motor power supplySTC-35, "Inspection 2: Motor Power Supply System"
13 Motor outputSTC-37, "Inspection 3: RAS Motor Output Malfunction"
21 Vehicle speed signalSTC-38, "Inspection 4: Vehicle Speed Signal"
22 Steering angle signalSTC-38, "Inspection 5: Steering Angle Signal Malfunction"
24 Rear wheel steering angle (main)STC-40, "Inspection 6: Rear Main Signal and Rear Sub Signal
Malfunction"
25 Rear wheel steering angle (sub)STC-40, "Inspection 6: Rear Main Signal and Rear Sub Signal
Malfunction"
26 VDCSTC-42, "Inspection 7: VDC Malfunction"
33 Engine speed signalSTC-43, "Inspection 8: Engine Speed Signal Malfunction"