Nissan March K13. Manual - part 634

EPS CONTROL UNIT

STC-11

< ECU DIAGNOSIS INFORMATION >

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TERMINAL LAYOUT

PHYSICAL VALUES

Fail-Safe

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• 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.)

JSGIA0717ZZ

Terminal No.

(Wire Color)

Description

Condition

Value

(Approx.)

+

−

Signal name

Input/Output

3

(P)

Ground

CAN-L

Input/Output

—

—

4

(Y)

Ground

Ignition power supply

Input

Ignition switch: ON

Battery voltage

Ignition switch: OFF

0 V

8

(L)

Ground

CAN-H

Input/Output

—

—

13

(

−

)

Ground

Torque sensor power 
supply

Output

Ignition switch: ON

5 V

14

(

−

)

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

(

−

)

Ground

Torque sensor ground

—

Always

0 V

16

(

−

)

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

(

−

)

—

Motor 

—

—

—

20

(

−

)

—

Motor 

—

—

—

STC-12

< ECU DIAGNOSIS INFORMATION >

EPS CONTROL UNIT

Protection Function

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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

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

DTC Index

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Priority

Priority order item (DTC)

1

U1000 CAN COMM CIRCUIT

2

C1601 BATTERY POWER SUPPLY

3

Other than the above

DTC

Items (CONSULT-III screen terms)

Reference

C1601

BATTERY VOLT

STC-19, "DTC Logic"

C1604

TORQUE SENSOR

STC-21, "DTC Logic"

C1606

EPS MOTOR

STC-23, "DTC Logic"

C1607

EEPROM

STC-24, "DTC Logic"

C1608

CONTROL UNIT

STC-24, "DTC Logic"

C1609

CAN VHCL SPEED

STC-25, "DTC Logic"

C1610

CAN ENG RPM

STC-26, "DTC Logic"

U1000

CAN COMM CIRCUIT

STC-27, "DTC Logic"

ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM

STC-13

< WIRING DIAGRAM >

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WIRING DIAGRAM

ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM 

Wiring Diagram

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JCGWM0223GB

STC-14

< WIRING DIAGRAM >

ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM

JCGWM0282GB