Nissan Sentra. Manual - part 830

C1606 EPS MOTOR

STC-27

< DTC/CIRCUIT DIAGNOSIS >

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C1606 EPS MOTOR

DTC Logic

INFOID:0000000009757441

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-27, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009757442

1.

CHECK TERMINALS AND HARNESS CONNECTORS

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

damaged, repair or replace the malfunctioning parts.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Erase self-diagnostic results for EPS.

2. Turn the ignition switch OFF, and then wait 10 seconds and more.

3. Perform self-diagnosis for EPS.
Is DTC C1606 detected?

YES

>> Replace EPS control unit. Refer to 

STC-39, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

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

STC-28

< DTC/CIRCUIT DIAGNOSIS >

C1607, C1608 EPS CONTROL UNIT

C1607, C1608 EPS CONTROL UNIT

DTC Logic

INFOID:0000000009757443

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-28, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009757444

1.

CHECK TERMINALS AND HARNESS CONNECTORS

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

damaged, repair or replace the malfunctioning parts.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the malfunctioning parts.

2.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Erase self-diagnostic results for EPS.

2. Turn the ignition switch OFF, and then wait 10 seconds and more.

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

YES

>> Replace EPS control unit. Refer to 

STC-39, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

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.

C1609 VEHICLE SPEED SIGNAL

STC-29

< DTC/CIRCUIT DIAGNOSIS >

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C1609 VEHICLE SPEED SIGNAL

DTC Logic

INFOID:0000000009757445

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-29, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009757446

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. Refer to 

STC-14, "DTC Index"

.

NO

>> GO TO 2.

2.

CHECK TERMINALS AND HARNESS CONNECTORS

Check EPS control unit pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace the malfunctioning parts.

3.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform EPS self-diagnosis.
Is DTC C1609 detected?

YES

>>  Replace EPS control unit. Refer to 

STC-39, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

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 malfunction is detected.

• Harness or connector

(CAN communication line)

• EPS control unit
• ABS malfunction 
- Vehicle speed signal mal-

function

STC-30

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM CIRCUIT

U1000 CAN COMM CIRCUIT

Description

INFOID:0000000009757447

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN-H line, CAN-L line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

INFOID:0000000009757448

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 U1000 detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-30, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009757449

Proceed to 

LAN-16, "Trouble Diagnosis Flow Chart"

.

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

EPS control unit is not transmitting/re-
ceiving CAN communication signal for 2 
seconds or more.

• CAN communication malfunction
• EPS control unit