Nissan Cube. Manual - part 926

C1606 EPS MOTOR

STC-25

< DTC/CIRCUIT DIAGNOSIS >

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C1606 EPS MOTOR

DTC Logic

INFOID:0000000009945975

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-25, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009945976

1.

CHECK EPS MOTOR

Check the EPS motor. Refer to 

STC-25, "Component Inspection"

. 

Is the inspection result normal?

 YES

>> GO TO 2.

 NO

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

ST-11, "Removal and

Installation"

.

2.

CHECK EPS MOTOR HARNESS CONNECTOR

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-38, "Exploded View"

.

NO

>> Repair or replace error-detected parts.

Component Inspection 

INFOID:0000000009945977

1.

CHECK EPS MOTOR

1.

Turn the ignition switch OFF.

2.

Disconnect EPS control unit harness connector.

3.

Check resistance between EPS control unit connector terminals.

Is the inspection result normal?

 YES

>> INSPECTION END

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 control unit

Resistance (Approx.)

Terminal

19

20

0.1 

Ω

 or less

STC-26

< DTC/CIRCUIT DIAGNOSIS >

C1606 EPS MOTOR

 NO

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

ST-11, "Exploded View"

.

C1607, C1608 EPS CONTROL UNIT

STC-27

< DTC/CIRCUIT DIAGNOSIS >

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C1607, C1608 EPS CONTROL UNIT

DTC Logic

INFOID:0000000009945978

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-27, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009945979

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 error-detected parts.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected 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-38, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-40, "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.

STC-28

< DTC/CIRCUIT DIAGNOSIS >

C1609 VEHICLE SPEED SIGNAL

C1609 VEHICLE SPEED SIGNAL

DTC Logic

INFOID:0000000009945980

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-28, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009945981

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 

BRC-98, "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 error-detected parts.

3.

PERFORM SELF-DIAGNOSIS

With CONSULT

Perform “EPS” self-diagnosis.

Is DTC “C1609” detected?

YES

>>  Replace EPS control unit. Refer to 

STC-38, "Removal and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-40, "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 error is detected.

• Harness or connector

(CAN communication line)

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