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Nissan Qashqai J11. Manual - part 989

STC-16

< ECU DIAGNOSIS INFORMATION >

EPS CONTROL UNIT

ECU DIAGNOSIS INFORMATION

EPS CONTROL UNIT

Reference Value

INFOID:0000000010452106

VALUES ON THE DIAGNOSIS TOOL

NOTE:
• 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.

• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-

ble to this vehicle, refer to CONSULT display items.

Monitor item

Data monitor

Condition

Display value

BATTERY VOLT

Ignition switch: ON

10.5 – 16 (V)

TORQUE SENSOR

Engine running

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

Approx. 0.0 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)

0.00 Nm

Steering wheel: Right turn

Positive value (Nm)

Steering wheel: Left turn

Negative value (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

Power steering warning lamp: ON

Power steering warning lamp: OFF

Off

ENGINE STATUS

Engine not running

Stop

Engine running

Run

ST TORQUE STATUS

Engine running

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

Off

Steering wheel: Right or left turn

EPS ASSIST PERMIS

Engine running

Status other than stop/start system

In stop/start system operation

Off

EPS CONTROL UNIT

STC-17

< ECU DIAGNOSIS INFORMATION >

STC

*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.

TERMINAL LAYOUT

PHYSICAL VALUES

STOP/START STATUS

When stop/start system is inactive

INACT

When stop/start system is restarting

AUTO ST

When stop/start system is active

ACT

When stop/start system is interrupted

CANCEL

IPA ON

When EPS system operation conditions are not satisfied

Off1

When there is a malfunction in EPS system or Intelligent Parking
Assist

Off2

When assist torque is larger than command value from Intelligent
Parking Assist

Off3

Normal

IPA STATUS 1

When Intelligent Parking Assist is active

When Intelligent Parking Assist is inactive

Off

STOP/START SYSTEM

When stop/start system is active

When stop/start system is prohibited

Off

IPA STATUS 2

When Intelligent Parking Assist is inactive

Off

When Intelligent Parking System is active (steering wheel is not
turned)

On1

The following cases
• When Intelligent Parking Assist is active
• When steering wheel is turned

On2

IPA STATUS 3

When Intelligent Parking Assist is normal

NORMAL

When Intelligent Parking Assist malfunction occurs

MALF

IPA TARGET CURRENT

When Intelligent Parking Assist is active

0 – 70 (A)

EPS CONTROL CUR-
RENT

When EPS system is active

0 – 90 (A)

Monitor item

Data monitor

Condition

Display value

JSGIA1434ZZ

STC-18

< ECU DIAGNOSIS INFORMATION >

EPS CONTROL UNIT

Fail-safe

INFOID:0000000010452107

• If any malfunction occurs in the system and control unit detects the malfunction, power steering warning

lamp on combination meter turns ON to indicate system malfunction.

• When power steering warning lamp is ON, the system enters into a manual steering state. (Control turning

force steering wheel becomes heavy.)

Protection Function

INFOID:0000000010452108

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 reactivates by no steering.

DTC Inspection Priority Chart

INFOID:0000000010452109

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

Terminal No.

(Wire Color)

Description

Condition

Value

(Approx.)

−

Signal name

Input/Output

(P)

—

CAN-L

Input/Output

—

(L)

—

CAN-H

Input/Output

—

(SB)

Ground

Ignition power supply

Input

Ignition switch: ON

10.5 V – 16 V

Ignition switch: OFF

0 V

(R)

Ground

Battery power supply

Input

Always

10.5 V – 16 V

(B)

Ground

—

Always

0 V

DTC

Fail-safe condition

C1601

The assist force is reduced according to the voltage, eventually ending with manual steering state

C1604

Manual steering state

C1606

C1607

C1608

C1609

Non-speed sensitive steering assist

U1000

• Non-speed sensitive steering assist
• Intelligent Parking Assist function (controlled from around view monitor) or Stop/Start system function (controlled

from ECM) is stopped

U1010

Normal control

U1970

Intelligent Parking Assist function (controlled from around view monitor) is stopped

Priority

Priority order item (DTC)

• U1000 CAN COMM CIRCUIT
• U1010 CONTROL UNIT(CAN)

• U1970 AVM
• C1609 CAN VHCL SPEED

C1601 BATTERY BOLT

• C1604 TORQUE SENSOR
• C1606 EPS MOTOR
• C1607 EPS EEPROM
• C1608 CONTROL UNIT

EPS CONTROL UNIT

STC-19

< ECU DIAGNOSIS INFORMATION >

STC

DTC Index

INFOID:0000000010452110

*: Even if DTC is detected, power steering warning lamp does not turns ON when assist torque is generated.
NOTE:
If two or more DTCs are detected, refer to

STC-18, "DTC Inspection Priority Chart"

DTC

Items (CONSULT screen terms)

Power steering

warning lamp

Reference

C1601

BATTERY VOLT

STC-25, "DTC Logic"

C1604

TORQUE SENSOR

STC-28, "DTC Logic"