2016 NISSAN NOTE steering

STC-6
< SYSTEM DESCRIPTION >
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
CONSULT FunctionINFOID:0000000012431944
FUNCTION
CONSULT can display each diagnostic item usi ng the diagnostic test modes shown following:
*: The following diagnosis information is cleared by erasing:
•DTC
• Freeze frame data (FFD)
ECU IDENTIFICATION
Displays the part number stored in the control unit.
SELF DIAGNOSTIC RESULT MODE
Refer to STC-10, "DTC Index".
When “CRNT” is displayed on “Self Diagnostic Result”.
• The system is presently malfunctioning.
When “PAST” is displayed on “Self Diagnostic Result”.• System malfunction in the past is detect ed, but the system is presently normal.
FREEZE FRAME DATA (FFD)
The following vehicle status is recorded when DTC is detected and is displayed on CONSULT:
DATA MONITOR MODE
*1: Almost in accordance with the value of “MOTOR S IG”. It is not a malfunction though these values are not
accorded when steering quickly.
Diagnostic test mode Function
ECU Identification The part number stored in the control unit can be read.
Self Diagnostic Result Self-diagnostic results and freeze frame data can be read and erased quickly.
*
Data MonitorInput/Output data in the EPS control unit can be read.
Item name Display item
IGN COUNTER
(0-39) The number of times that ignition switch is tu
rned ON after the DTC is detected is displayed.
• When “0” is displayed: It indicates that the system is presently malfunctioning.
• When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system is pres-
ently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1 →2→3...38 →39.
When the operation number of times exceeds 39, the number does not increase and “39” is displayed until self-
diagnosis is erased.
Monitor item (Unit) Remarks
BATTERY VOLT (V) Displays the power supply voltage for EPS control unit.
TORQUE SENSOR (Nm) Displays steering wheel turning force detected by torque sensor.
MOTOR CURRENT (A) Displays the current value consumed by EPS motor.
*1
MOTOR SIG (A) Displays the current commanded value to EPS motor.
ASSIST TORQUE (Nm) Displays assist torque being output by the electric power steering.
C/U TEMP ( °C or °F) Displays the temperature of the EPS control unit.
ASSIST LEVEL (%) Normally displays 100%. In case of an excessive stationary steering, the assist
curvature gradually falls. However, it return to 100% when left standing.
*2
VEHICLE SPEED (km/h or MPH)
Vehicle speed is displayed from vehicle speed signal via CAN communication.*3
WARNING LAMP (On/Off)EPS warning lamp control status is displayed.
ENGINE STATUS (Stop/Run) Engine speed is displayed from engine status signal via CAN communication.
Revision: August 2015 2016 Versa Note

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DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
STC-7
< SYSTEM DESCRIPTION >
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*2: Normally displays 100%. In case of an excessive stationary steering, the assist curvature gradually falls.
However, it returns to 100% when left standing.
*3: It is not a malfunction, though it might not be corresponding just after ignition switch in turned ON.
Revision: August 2015 2016 Versa Note

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STC-8
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
ECU DIAGNOSIS INFORMATION
EPS CONTROL UNIT
Reference ValueINFOID:0000000012431945
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The output signal indicates the EPS control unit calculation data. The normal values will be displayed
even in the event that the output circuit (harness) is open.
*1: Almost in accordance with the value of “MOTOR S IG”. It is not a malfunction though these values are not
accorded when steering quickly.
*2: A fixed value is indicated regardless of steering turning.
*3: Normally displays 100%. In case of an excessive stat ionary steering, the assist curvature gradually falls.
However, it returns to 100% when left standing.
*4: It is not a malfunction, though it might not be co rresponding just after ignition switch in turned ON.
Monitor item Data monitor
Condition Display value
BATTERY VOLT Ignition switch: ON Battery voltage
TORQUE SENSOR Engine running Steering wheel: Not
steering (There is
no steering force) Approx. 0 Nm
Steering wheel: Right turn Positive value (Nm)
Steering wheel: Left turn Negative value (Nm)
MOTOR CURRENT Engine running Steering wheel: Not
steering (There is
no steering force) Approx. 0 A
Steering wheel: Right or left turn Displays consumption current of
EPS motor (A)
*1
MOTOR SIG
Engine runningSteering wheel: Not
steering (There is
no steering force) Approx. 0 A
Steering wheel: Right turn Positive value (A)
Steering wheel: Left turn Negative value (A)
ASSIST TORQUE Engine running Approx. 0 Nm
*2
C/U TEMPIgnition switch ON or engine running Displays temperature of inside of
EPS control unit (
°C or °F)
ASSIST LEVEL Engine running
100 %
*3
VEHICLE SPEEDVehicle stopped
0 km/h or mph
While driving Approximately equal to the indication
on speedometer*4
(inside of ±
10%)
WARNING LAMP EPS warning lamp: ON
On
EPS warning lamp: OFF Off
ENGINE STATUS Engine not running
Stop
Engine running Run
Revision: August 2015 2016 Versa Note

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EPS CONTROL UNITSTC-9
< ECU DIAGNOSIS INFORMATION >
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TERMINAL LAYOUT
PHYSICAL VALUES
Fail-SafeINFOID:0000000012431946
• If any malfunction occurs in the system and control uni t detects the malfunction, EPS warning lamp on com-
bination meter turns ON to indicate system malfunction.
• When EPS warning lamp is ON, the system enters into a manual steering state. (Steering wheel turning force becomes heavy.)
• Under abnormal vehicle speed signal conditions, vehicle speed is judged as constant.
ALGIA0167ZZ
Te r m i n a l N o .
(Wire Color) Description
ConditionVa l u e
(Approx.)
+ − Signal name Input/Output
1
(P) — CAN-low
Input/Output ——
2
(L) — CAN-high
Input/Output ——
4
(Y) Ground Ignition power supply Input Ignition switch: ON
Battery voltage
Ignition switch: OFF 0 V
13
(R) Ground Torque sensor power
supply
OutputIgnition switch: ON
5 V
Ignition switch: OFF 0 V
14
(Y) Ground Torque sensor sub Input Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force) 2.5 V
Engine running Steering wheel: steer-
ing 1.6 V – 3.4 V
(The value is changed according to steering
left or right)
15
(B) Ground Torque sensor ground Input Always
0 V
16
(W) Ground Torque sensor main Input Ignition switch: ON
Steering wheel: Not
steering (There is no
steering force) 2.5 V
Engine running Steering wheel: steer-
ing 1.6 V – 3.4 V
(The value is changed according to steering left or right)
17
(R) Ground Battery power supply Input Always
Battery voltage
18
(B) Ground Ground
— Always 0 V
19
(R) —
Motor —— —
20
(B) —
Motor —— —
Revision: August 2015
2016 Versa Note

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STC-10
< ECU DIAGNOSIS INFORMATION >
EPS CONTROL UNIT
Protection Function
INFOID:0000000012431947
EPS control unit decreases the output signal to EPS mo tor while extremely using the power steering function
(e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection control).
While activating overload protection control, the assist torque gradually decreases, and the steering wheel
turning force becomes heavy. The normal assist torque reactivates by no steering.
DTC Inspection Priority ChartINFOID:0000000012431948
When multiple DTCs are detected simultaneously, c heck one by one depending on the following priority list:
DTC IndexINFOID:0000000012431949
Priority Priority order item (DTC)
1 U1000 CAN COMM CIRCUIT
2 C1609 CAN VHCL SPEED, C1610 CAN ENG RPM
3 C1601 BATTERY VOLT
4 Other than the above
DTC Items (CONSULT screen terms) Reference
C1601 BATTERY VOLT STC-18, "
DTC Logic"
C1604TORQUE SENSOR STC-21, "DTC Logic"
C1606EPS MOTOR STC-23, "DTC Logic"
C1607EEPROM STC-25, "DTC Logic"
C1608CONTROL UNIT STC-25, "DTC Logic"
C1609CAN VHCL SPEED STC-26, "DTC Logic"
C1610CAN ENG RPM STC-27, "DTC Logic"
U1000CAN COMM CIRCUIT STC-28, "DTC Logic"
Revision: August 2015 2016 Versa Note

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STC-16
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
YES >> GO TO 7.
NO >> Check harness and connectors based on the information obtained by interview. Refer to GI-42,
"Intermittent Incident".
7.FINAL CHECK
With CONSULT
1. Check the reference value for EPS control unit.
2. Recheck the symptom and check that sympto m is not reproduced on the same conditions.
Is the symptom reproduced?
YES >> GO TO 3.
NO >> Inspection End.
Diagnostic Work SheetINFOID:0000000012431952
Description
• In general, customers have their own criteria for a pr oblem. Therefore, it is important to understand the
symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the interview sheet referring to the interview points.
• In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.
Interview sheet sample
Interview sheet
Customer
name MR/MSRegistration
number
Initial year
registration
Vehicle type VIN
Storage date EngineMileagekm (Mile)
Symptom †
The steering wheel position (center) is in the wrong position.
† Warning lamp turns on.
† Noise †Vibration
† Others
( )
First occurrence †Recently †Others ( )
Frequency of occurrence †Always †Under a certain conditions of †Sometimes (time(s)/day)
Climate con-
ditions †
Irrelevant
Weather †Fine †Cloud †Rain †Snow †Others ( )
Temperature †Hot †Warm †Cool †Cold †Temperature [Approx. °C ( °F)]
Relative humidity †High †Moderate †Low
Road conditions †
Urban area †Suburb area †High way
† Mountain road (uphill or down hill) †Rough road
Operation conditions, etc. †
Irrelevant
† When engine starts †During idling
† During driving †During acceleration †At constant speed driving
† During deceleration †During cornerin g (right curve or left curve)
† During steering
Revision: August 2015 2016 Versa Note

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C1604 TORQUE SENSORSTC-21
< DTC/CIRCUIT DIAGNOSIS >
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C1604 TORQUE SENSOR
DTC LogicINFOID:0000000012431955
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.DTC REPRODUCTION PROCEDURE
With CONSULT
1. Turn the ignition switch OFF to ON.
2. Perform “Self Diagnostic Result” of “EPS”.
Is DTC
“C1604” detected?
YES >> Proceed to diagnosis procedure. Refer to STC-21, "Diagnosis Procedure".
NO >> Inspection End.
Diagnosis ProcedureINFOID:0000000012431956
Regarding Wiring Diagram information, refer to STC-11, "Wiring Diagram".
1.CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF to ON. CAUTION:
Never start the engine.
2. Check voltage between EPS control unit harness connector terminal and ground.
CAUTION:
Steering wheel in neutral position . (There is no steering force.)
Is the inspection result normal?
YES >> GO TO 2.
NO >> Perform the trouble diagnosis for battery power supply circuit. Refer to STC-18, "
Diagnosis Proce-
dure".
2.CHECK TORQUE SENSOR GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between EPS control unit harness connector terminal and ground. CAUTION:
Steering wheel in neutral position . (There is no steering force.)
DTCDisplay item Malfunction detected condition Possible cause
C1604 TORQUE SENSOR When torque sensor output signal is malfunctioning. • Harness or connector
• Torque sensor
• EPS control unit
EPS control unit
—Vo l ta g e
(Approx.)
Connector Terminal
M54 13Ground 5 V
Revision: August 2015 2016 Versa Note

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STC-22
< DTC/CIRCUIT DIAGNOSIS >
C1604 TORQUE SENSOR
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
3.CHECK TORQUE SENSOR SIGNAL
1. Turn ignition switch OFF to ON.
2. Check voltage between EPS control unit harness connector terminal and ground. CAUTION:
Steering wheel in neutral position. (There is no steering force.)
3. Start the engine.
4. Check voltage between EPS control unit harness connector terminal and ground while turning the steer- ing wheel.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Torque sensor is malfunctioning. Repl ace steering column assembly. Refer to ST-9, "
Exploded
View".
4.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect EPS control unit harness connector.
3. Check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.
Is the inspection result normal?
YES >> Replace EPS control unit. Refer to STC-37, "Removal and Installation".
NO >> Repair or replace malfunctioning component.
EPS control unit —Continuity
Connector Terminal
M54 15Ground Yes
EPS control unit
—Vo l ta g e
(Approx.)
Connector Terminal
M54 16
Ground 2.5 V
14
EPS control unit —Voltag e
(Approx.)
Connector Terminal
M54 16
Ground 1.6 V – 3.4 V
(The value is changed according to steering left or right)
14
Revision: August 2015
2016 Versa Note

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