Nissan Juke (2012 year). Service Repair Manual

PRECAUTIONS

STC-3

< PRECAUTION >

STC

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

INFOID:0000000007579103

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIR BAG” and “SEAT BELT” of this
Service Manual.

WARNING:

Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision that would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see “SRS AIR BAG”.

• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the

ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with
a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing
serious injury.

• When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Service Notice or Precautions for EPS System

INFOID:0000000007579104

• Check the following item when performing the trouble diagnosis.
- Check any possible causes by interviewing the symptom and it

′

s condition from the customer if any malfunc-

tion, such as EPS warning lamp is turned ON, occurs.

- Check if air pressure and size of tires are proper, the specified part is used for the steering wheel, and con-

trol unit is genuine part.

- Check if the connection of steering column assembly and steering gear assembly is proper (there is not

looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease, etc).

- Check if the wheel alignment is adjusted properly.
- Check if there is any damage or modification to suspension or body resulting in increased weight or altered

ground clearance.

- Check if installation conditions of each link and suspension are proper.
- Check if the battery voltage is proper.
- Check connection conditions of each connector are proper.

Revision: 2011 October

2012 JUKE

COMPONENT PARTS

STC-5

< SYSTEM DESCRIPTION >

STC

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000007579105

*: Models with Integrated Control System

Component Description

INFOID:0000000007579106

Multi display unit

Refer to

DMS-3, "Component Parts

Location"

ABS actuator and electric unit (con-
trol unit)
Refer to

BRC-8, "Component Parts

Location"

ECM
Refer to

EC-16, "ENGINE CON-

TROL SYSTEM :
Component Parts Location"

Combination meter
Refer to

MWI-5, "METER SYSTEM :

Component Parts Location"

EPS warning lamp
(In combination meter)

EPS motor

EPS control unit

Reduction gear

Torque sensor

Steering column assembly

JSGIA0830GB

Components parts

Reference

EPS control unit

STC-6, "EPS Control Unit"

EPS motor

STC-6, "EPS Motor"

Torque sensor

STC-6, "Torque Sensor"

Reduction gear

STC-6, "Reduction Gear"

EPS warning lamp

STC-7, "EPS SYSTEM : System Description"

Revision: 2011 October

2012 JUKE

STC-6

< SYSTEM DESCRIPTION >

COMPONENT PARTS

*: Models with Integrated Control System

EPS Control Unit

INFOID:0000000007579107

• EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor

signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal
to the EPS motor according to the driving condition.

• EPS control unit decreases the output signal to EPS motor while extremely using the power steering func-

tion (e.g., full steering) consecutively for protecting EPS motor and EPS control unit (Overload protection
control).

• In SPORT mode, changes the steering assist characteristic to enhance a stable steering feel according to

the mode signals from multi display unit via CAN communication. (Models with Integrated Control System)

EPS Motor

INFOID:0000000007579108

EPS motor provides the assist torque by the control signal from EPS control unit.

Torque Sensor

INFOID:0000000007579109

Torque sensor detects the steering torque, and transmit the signal to EPS control unit.

Reduction Gear

INFOID:0000000007579110

Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft.

ECM

• Transmits mainly the following signals to EPS control unit via

CAN communication.

- Engine status signal

ABS actuator and electric unit (control unit)

• Transmits mainly the following signal to EPS control unit via

CAN communication.

- Vehicle speed signal

Combination meter

• Transmits mainly the following signal to EPS control unit via

CAN communication.

- Vehicle speed signal

• Turns ON the EPS warning lamp according to the signal from

EPS control unit via CAN communication.

Multi display unit

• Transmits mainly the following signals to EPS control unit via

CAN communication.

- ECO mode signal
- NORMAL mode signal
- SPORT mode signal

Components parts

Reference

Revision: 2011 October

2012 JUKE

SYSTEM

STC-7

< SYSTEM DESCRIPTION >

STC

SYSTEM

EPS SYSTEM

EPS SYSTEM : System Description

INFOID:0000000007579111

• EPS control unit performs an arithmetical operation on data, such

as steering wheel turning force (sensor signal) from the torque
sensor, vehicle speed signal, etc. Then it generates an optimum
assist torque signal to the EPS motor according to the driving con-
dition.

• In case of an error in the electrical system, the fail-safe function

stops output signals to the EPS motor. Refer to

STC-8, "EPS SYS-

TEM : Fail-Safe"

• EPS control unit decreases the output signal to EPS motor while

extremely using the power steering function (e.g., full steering)
consecutively for protecting EPS motor and EPS control unit
(Overload protection control). Refer to

STC-8, "EPS SYSTEM :

Protection Function"

• Extensive steering at low speed will cause the EPS control unit

and EPS motor to heat up, once temperature reaches critical point
EPS control unit will reduce current to reduce heat up. System will
recover as temperature lowers (reduced or no assistance).

• In SPORT mode, changes the steering assist characteristic to

enhance a stable steering feel according to the mode signals from
multi display unit via CAN communication. (Models with Integrated
Control System)

SYSTEM DIAGRAM

Multi display unit is applied to models with Integrated Control System.

INPUT/OUTPUT SIGNAL

Communicates the signal from each control unit via CAN communication.

JSGIA0832GB

JSGIA0833GB

Control unit

Signal status

ECM

• Transmits mainly the following signals to EPS control unit via CAN communication.
- Engine status signal

ABS actuator and electric unit (con-
trol unit)

• Transmits mainly the following signals to EPS control unit via CAN communication.
- Vehicle speed signal

Revision: 2011 October

2012 JUKE

STC-8

< SYSTEM DESCRIPTION >

SYSTEM

*: Models with Integrated Control System

EPS WARNING LAMP INDICATION

• Turn ON when there is a malfunction in EPS system. If indicates that fail-safe mode is engaged and enters a

manual steering state (Control turning force steering wheel becomes heavy).

• Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF after the engine

starts, if system is normal.

CAUTION:

EPS warning lamp also turns ON due to data reception error, CAN communication error etc.

EPS SYSTEM : Fail-Safe

INFOID:0000000007579112

• If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on com-

bination meter turns ON to indicate system malfunction.

• When EPS warning lamp is ON, enters into a manual steering state. (Control turning force steering wheel

becomes heavy.)

EPS SYSTEM : Protection Function

INFOID:0000000007579113

EPS control unit decreases the output signal to EPS motor 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 is recovered if the steering wheel is not turned for a
while.

Combination meter

• Transmits mainly the following signals to EPS control unit via CAN communication.
- Vehicle speed signal
• Receives mainly the following signals from EPS control unit via CAN communication.
- EPS warning lamp signal

Multi display unit

• Transmits mainly the following signals to EPS control unit via CAN communication.
- ECO mode signal
- NORMAL mode signal
- SPORT mode signal

Control unit

Signal status

Condition

EPS warning lamp

Ignition switch ON. (Lamp check)

Engine running.

OFF

EPS system malfunction [Other diagnostic item]

Revision: 2011 October

2012 JUKE

DIAGNOSIS SYSTEM (EPS CONTROL UNIT)

STC-9

< SYSTEM DESCRIPTION >

STC

DIAGNOSIS SYSTEM (EPS CONTROL UNIT)

CONSULT Function

INFOID:0000000007579114

FUNCTION

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

*: The following diagnosis information is erased by erasing.
• DTC
• Freeze frame data (FFD)

ECU IDENTIFICATION

Displays the part number stored in the control unit.

SELF-DIAG RESULTS MODE

Refer to

STC-13, "DTC Index"

When “CRNT” is displayed on self-diagnosis result.

• The system is presently malfunctioning.

When “PAST” is displayed on self-diagnosis result.

• System malfunction in the past is detected, 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

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 monitor

Input/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 turned 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

→

3...38

→

39.

When the operation number of times exceeds 39, the number do 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.

MOTOR SIG (A)

Displays the current commanded value to EPS motor.

ASSIST TORQUE (Nm)

Displays assist torque of EPS motor being output by the electric power steering.

C/U TEMP (

C) or (

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.

VEHICLE SPEED (km/h) or (MPH)

Vehicle speed is displayed from vehicle speed signal via CAN communication.

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.

STEERING MODE (NORMAL/SPORT)

Display the driving mode of Integrated Control System received through CAN
communication.

Revision: 2011 October

2012 JUKE

EPS CONTROL UNIT

STC-11

< ECU DIAGNOSIS INFORMATION >

STC

ECU DIAGNOSIS INFORMATION

EPS CONTROL UNIT

Reference Value

INFOID:0000000007579115

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 SIG”. It is not a malfunction though these values are not
accorded when steering quickly.
*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.
*4: Displays NORMAL in models without Integrated Control System.

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)

MOTOR SIG

Engine running

Steering 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

Steering wheel: Not steering (There is
no steering force)

Approx. 0 Nm

Steering wheel: Right or left turn

Displays assist torque of EPS motor
(Nm)

C/U TEMP

Ignition switch ON or engine running

Displays temperature of inside of
EPS control unit [

C (

F)]

ASSIST LEVEL

Engine running

100 %

VEHICLE SPEED

Vehicle stopped

0 km/h (0 mph)

While driving

Approximately equal to the indication

on speedometer

(inside of

10%)

WARNING LAMP

EPS warning lamp: ON

EPS warning lamp: OFF

Off

ENGINE STATUS

Engine not running

Stop

Engine running

Run

STEERING MODE

Engine running

Driving mode of Integrated Control
System: Except SPORT

NORMAL

Driving mode of Integrated Control
System: SPORT

SPORT

Revision: 2011 October

2012 JUKE

STC-12

< ECU DIAGNOSIS INFORMATION >

EPS CONTROL UNIT

TERMINAL LAYOUT

PHYSICAL VALUES

Fail-Safe

INFOID:0000000007579116

• If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on com-

bination meter turns ON to indicate system malfunction.

• When EPS warning lamp is ON, enters into a manual steering state. (Control turning force steering wheel

becomes heavy.)

Protection Function

INFOID:0000000007579117

DTC Inspection Priority Chart

INFOID:0000000007579118

When multiple DTCs are detected simultaneously, check one by one depending on the following priority list.

JSGIA0834ZZ

Terminal No.

(Wire Color)

Description

Condition

Value

(Approx.)

−

Signal name

Input/Output

(P)

—

CAN-L

Input/Output

—

(L)

—

CAN-H

Input/Output

—

(LG)

Ground

Ignition power supply

Input

Ignition switch: ON

9 – 18.2 V

Ignition switch: OFF

0 V

(R)

Ground

Battery power supply

Input

Always

9 – 18.2 V

(B)

Ground

—

Always

0 V

Priority

Priority order item (DTC)

U1000 CAN COMM CIRCUIT

C1609 VEHICLE SPEED SIGNAL

C1601 BATTERY POWER SUPPLY

Other than the above

Revision: 2011 October

2012 JUKE

EPS CONTROL UNIT

STC-13

< ECU DIAGNOSIS INFORMATION >

STC

DTC Index

INFOID:0000000007579119

DTC

Items (CONSULT screen terms)

Reference

C1601

BATTERY VOLT

STC-18, "DTC Logic"

C1604

TORQUE SENSOR

STC-20, "DTC Logic"

C1606

EPS MOTOR

STC-21, "DTC Logic"

C1607

EEPROM

STC-22, "DTC Logic"

C1608

CONTROL UNIT

STC-22, "DTC Logic"

C1609

CAN VHCL SPEED

STC-23, "DTC Logic"

U1000

CAN COMM CIRCUIT

STC-24, "DTC Logic"

Revision: 2011 October

2012 JUKE

DIAGNOSIS AND REPAIR WORKFLOW

STC-15

< BASIC INSPECTION >

STC

BASIC INSPECTION

DIAGNOSIS AND REPAIR WORKFLOW

Work Flow

INFOID:0000000007579121

DETAILED FLOW

INTERVIEW FROM THE CUSTOMER

Clarify customer complaints before inspection. First of all, perform an interview utilizing

STC-16, "Diagnostic

Work Sheet"

and reproduce symptoms as well as fully understand it. Ask customer about his/her complaints

carefully. Check symptoms by driving vehicle with customer, if necessary.

CAUTION:

Customers are not professional. Never guess easily like “maybe the customer means that...,” or
“maybe the customer mentions this symptom”.

>> GO TO 2.

CHECK SYMPTOM

Reproduce the symptom that is indicated by the customer, based on the information from the customer
obtained by interview. Also check that the symptom is not caused by protection function. Refer to

STC-12,

"Protection Function"

CAUTION:

When the symptom is caused by normal operation, fully inspect each portion and obtain the under-
standing of customer that the symptom is not caused by a malfunction.

>> GO TO 3.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform self-diagnosis.
Is any DTC detected?

YES

>> Record or print DTC and freeze frame data (FFD). GO TO 4.

>> GO TO 6.

RECHECK SYMPTOM

With CONSULT

Erase self-diagnostic results for “EPS”.

Perform DTC confirmation procedures for the error detected system.

NOTE:
If some DTCs are detected at the same time, determine the order for performing the diagnosis based on

STC-

12, "DTC Inspection Priority Chart"

Is any DTC detected?

YES

>> GO TO 5.

>> Check harness and connectors based on the information obtained by interview. Refer to

GI-43,

"Intermittent Incident"

REPAIR OR REPLACE ERROR-DETECTED PARTS

• Repair or replace error-detected parts.
• Reconnect part or connector after repairing or replacing.
• When DTC is detected, erase self-diagnostic results for “EPS”.

>> GO TO 7.

IDENTIFY ERROR-DETECTED SYSTEM BY SYMPTOM DIAGNOSIS

Estimate error-detected system based on symptom diagnosis and perform inspection.
Can the error-detected system be identified?

Revision: 2011 October

2012 JUKE

STC-16

< BASIC INSPECTION >

DIAGNOSIS AND REPAIR WORKFLOW

YES

>> GO TO 7.

>> Check harness and connectors based on the information obtained by interview. Refer to

GI-43,

"Intermittent Incident"

FINAL CHECK

With CONSULT

Check the reference value for EPS control unit.

Recheck the symptom and check that symptom is not reproduced on the same conditions.

Is the symptom reproduced?

YES

>> GO TO 3.

>> INSPECTION END

Diagnostic Work Sheet

INFOID:0000000007579122

Description

• In general, customers have their own criteria for a problem. 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/MS

Registration
number

Initial year
registration

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

Symptom

The steering wheel position (center) is in the wrong position.

EPS 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

Mounting 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 cornering (right curve or left curve)

During steering

Revision: 2011 October

2012 JUKE

DIAGNOSIS AND REPAIR WORKFLOW

STC-17

< BASIC INSPECTION >

STC

Other conditions

Memo

Interview sheet

Customer
name

MR/MS

Registration
number

Initial year
registration

Vehicle type

VIN

Storage date

Engine

Mileage

km (Mile)

Revision: 2011 October

2012 JUKE

STC-18

< DTC/CIRCUIT DIAGNOSIS >

C1601 BATTERY POWER SUPPLY

DTC/CIRCUIT DIAGNOSIS

C1601 BATTERY POWER SUPPLY

DTC Logic

INFOID:0000000007579123

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

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.

DTC REPRODUCTION PROCEDURE

With CONSULT

Turn the ignition switch OFF to ON.

Perform “EPS” self-diagnosis.

Is DTC “C1601” detected?

YES

>> Proceed to diagnosis procedure. Refer to

STC-18, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000007579124

CHECK EPS CONTROL UNIT GROUND CIRCUIT

Turn ignition switch OFF.

Disconnect EPS control unit harness connector.

Check continuity between EPS control unit harness connector terminal and ground.

Connect EPS control unit harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (1)

Check voltage between EPS control unit harness connector terminals and ground.

Turn ignition switch ON.

CAUTION:

Never start the engine.

DTC

Display item

Malfunction detected condition

Possible cause

C1601

BATTERY VOLT

When a power supply voltage to the EPS control unit
is maintained at 18.2 V or more or at less than 9 V
continuously for five second or more.

• Harness or connector
• EPS control unit
• Fuse
• Power supply system
• Battery

EPS control unit

—

Continuity

Connector

Terminal

M38

Ground

Existed

EPS control unit

—

Voltage

Connector

Terminal

M37

Ground

Approx. 0 V

Revision: 2011 October

2012 JUKE

Nissan Juke (2012 year). Service Repair Manual - part 217