Nissan Leaf. Manual - part 1145

C1601 BATTERY POWER SUPPLY

STC-25

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

NO

>> Repair or replace the malfunctioning parts.

6.

CHECK TERMINALS AND HARNESS CONNECTORS

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

YES

>> EPS control unit is malfunctioning. Replace steering column assembly. Refer to 

ST-35, "Removal

and Installation"

.

NO

>> Repair or replace the malfunctioning parts.

STC-26

< DTC/CIRCUIT DIAGNOSIS >

C1604 TORQUE SENSOR

C1604 TORQUE SENSOR

DTC Logic

INFOID:0000000010119197

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power 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 power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “C1604” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-26, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010119198

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 malfunctioning parts.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Erase “Self-Diagnostic Result” of “EPS” control unit.

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

3. Turn the power switch OFF to ON.

4. Perform “Self-Diagnostic Result” of “EPS”.
Is DTC “C1604” detected?

YES

>> Torque sensor is malfunctioning. Replace steering column assembly. Refer to 

ST-35, "Removal

and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

DTC

Display item

Malfunction detected condition

Possible cause

C1604

TORQUE SENSOR

When torque sensor output signal is malfunctioning.

• Harness or connector
• Torque sensor
• EPS control unit

C1606 EPS MOTOR

STC-27

< 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:0000000010119199

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power 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 power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “C1606” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-27, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010119200

1.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Erase “Self-Diagnostic Result” of “EPS” control unit.

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

3. Turn the power switch OFF to ON.

4. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “C1606” detected?

YES

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

ST-35, "Removal and

Installation"

.

NO

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

any items are damaged, repair or replace malfunctioning parts.

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:0000000010119201

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power 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 power switch OFF to ON.

2. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “C1607” or “C1608” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-28, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000010119202

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 malfunctioning parts.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace malfunctioning parts.

2.

PERFORM SELF-DIAGNOSIS

 With CONSULT

1. Erase “Self-Diagnostic Result” results of “EPS” control unit.

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

3. Turn the power switch OFF to ON.

4. Perform “Self-Diagnostic Result” of “EPS” control unit.
Is DTC “C1607” or “C1608” detected?

YES

>> EPS control unit is malfunctioning. Replace steering column assembly. Refer to 

ST-35, "Removal

and Installation"

.

NO

>> Check intermittent incident. Refer to 

GI-53, "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.