Nissan Note E12. Manual - part 601

C1606 EPS MOTOR

STC-23

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1606 EPS MOTOR

DTC Logic

INFOID:0000000009578762

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 “EPS” self-diagnosis.
Is DTC “C1606” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-23, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009578763

1.

CHECK EPS MOTOR

Check the EPS motor. Refer to 

STC-23, "Component Inspection"

. 

Is the inspection result normal?

 YES

>> GO TO 2.

 NO

>> EPS motor is malfunction. Replace steering column assembly. Refer to 

ST-9, "Removal and

Installation"

.

2.

CHECK CONNECTOR

1. Turn ignition switch OFF.

2. Disconnect EPS motor 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.

Component Inspection 

INFOID:0000000009578764

1.

CHECK EPS MOTOR

1. Turn the ignition switch OFF.

2. Disconnect EPS motor harness connector.

3. Check resistance between EPS motor connector terminals.

Is the inspection result normal?

DTC

Display item

Malfunction detected condition

Possible cause

C1606

EPS MOTOR

When the motor driver malfunction of EPS control 
unit or EPS motor malfunction is detected.

• Harness or connector
• EPS motor
• EPS control unit

EPS motor

Resistance (Approx.)

Terminal

19

20

0.1 

Ω or less

STC-24

< DTC/CIRCUIT DIAGNOSIS >

C1606 EPS MOTOR

 YES

>> Inspection End.

 NO

>> EPS motor is malfunctioning. Replace steering column assembly. Refer to 

ST-9, "Removal and

Installation"

.

C1607, C1608 EPS CONTROL UNIT

STC-25

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1607, C1608 EPS CONTROL UNIT

DTC Logic

INFOID:0000000009578765

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 “EPS” self-diagnosis.
Is DTC “C1607” or “C1608” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-25, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009578766

1.

PERFORM SELF-DIAGNOSIS

With CONSULT

1. Turn the ignition switch OFF to ON.

2. Erase self-diagnosis results for “EPS”.

3. Perform “EPS” self-diagnosis.
Is DTC “C1607” or “C1608” detected?

YES

>> Replace EPS control unit. Refer to 

STC-37, "Removal and Installation"

.

NO

>> Check EPS control unit pin terminals for damage or loose connection with harness connector. If

any item are damaged, repair or replace malfunctioning component.

DTC

Display item

Malfunction detected condition

Possible cause

C1607

EEPROM

When the memory (EEPROM) system malfunction is 
detected in EPS control unit.

EPS control unit

C1608

CONTROL UNIT

When the internal malfunction is detected in EPS 
control unit.

STC-26

< DTC/CIRCUIT DIAGNOSIS >

C1609 VEHICLE SPEED SIGNAL

C1609 VEHICLE SPEED SIGNAL

Description

INFOID:0000000009578767

EPS control unit receives the vehicle speed signal from ABS actuator and electric unit (control unit) via CAN

communication line.

DTC Logic

INFOID:0000000009578768

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 “EPS” self-diagnosis.
Is DTC “C1609” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-26, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009578769

1.

PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS

With CONSULT

1. Turn the ignition switch OFF to ON.

2. Perform “ABS” self-diagnosis. 
Is any DTC detected?

YES

>> Check the DTC.

NO

>> GO TO 2.

2.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform “EPS” self-diagnosis.
Is DTC “C1609” detected?

YES

>> Replace EPS control unit. Refer to 

STC-37, "Removal and Installation"

.

NO

>> Check EPS control unit pin terminals for damage or loose connection with harness connector. If

any item are damaged, repair or replace malfunctioning component.

DTC

Display item

Malfunction detected condition

Possible cause

C1609

CAN VHCL SPEED

• Malfunction is detected in vehicle speed signal that 

is output from ABS actuator and electric unit (con-
trol unit) via CAN communication.

• ABS actuator and electric unit (control unit) input 

signal error is detected.

• Harness or connector
• CAN communication line
• EPS control unit
• ABS malfunction 
- Vehicle speed signal error