NISSAN NOTE 2016 Service Repair Manual

DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
STC-7
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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
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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"
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EPS SYSTEMSTC-11
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WIRING DIAGRAM
EPS SYSTEM
Wiring DiagramINFOID:0000000012431950
ABGWA0111GB
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STC-12
< WIRING DIAGRAM >
EPS SYSTEM
ABGIA0169GB
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EPS SYSTEMSTC-13
< WIRING DIAGRAM >
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ABGIA0170GB
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STC-14
< WIRING DIAGRAM >
EPS SYSTEM
ABGIA0171GB
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DIAGNOSIS AND REPAIR WORKFLOWSTC-15
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000012431951
DETAILED FLOW
1.INTERVIEW FROM THE CUSTOMER
Clarify customer complaints before inspection. First of all, perform an interview utilizing STC-16, "
Diagnostic
Work Sheet" and reproduce symptoms to understand them fully. Ask customer about his/her complaints care-
fully. Check symptoms by driving v ehicle with customer, if necessary.
CAUTION:
Customers are not professional. Never make assumpti ons like “maybe the customer means that...,” or
“maybe the customer mentioned this symptom”.
>> GO TO 2.
2.CHECK SYMPTOM
Reproduce the symptom that is indicated by the cu stomer, based on the information from the customer
obtained by interview. Also check that the symptom is not caused by protection function. Refer to STC-10,
"Protection Function".
CAUTION:
When the symptom is caused by normal operation, fully inspect each portio n and obtain the under-
standing of customer that the symptom is not caused by a malfunction.
>> GO TO 3.
3.PERFORM SELF-DIAGNOSIS
With CONSULT
Perform “Self Diagnostic Result” of “EPS”.
Is any DTC detected?
YES >> Record or print self-diagnostic results. GO TO 4.
NO >> GO TO 6.
4.RECHECK SYMPTOM
With CONSULT
1. Erase “Self Diagnostic Result” of “EPS”.
2. Perform DTC confirmation procedures for the malfunctioning system.
NOTE:
If some DTCs are detected at the same time, determine the order for performing the diagnosis based on STC-
10, "DTC Inspection Priority Chart".
Is any DTC detected?
YES >> GO TO 5.
NO >> Check harness and connectors based on the in formation obtained by interview. Refer to GI-42,
"Intermittent Incident".
5.REPAIR OR REPLACE MALFUNCTIONING COMPONENT
• Repair or replace malfunctioning component.
• Reconnect part or connector after repairing or replacing.
• When DTC is detected, erase “Self Diagnostic Result” of “EPS”.
>> GO TO 7.
6.IDENTIFY MALFUNCTIONING SY STEM BY SYMPTOM DIAGNOSIS
Identify malfunctioning system based on sym ptom diagnosis and perform inspection.
Can the malfunctioning system be identified?
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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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