Nissan March K13. Manual - part 636

C1601 BATTERY POWER SUPPLY

STC-19

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

DTC/CIRCUIT DIAGNOSIS

C1601 BATTERY POWER SUPPLY

Description

INFOID:0000000005912720

Power is supplied from the battery to EPS control unit.

DTC Logic

INFOID:0000000005912721

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS” self-diagnosis.

Is DTC “C1601” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-19, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005912722

1.

CHECK EPS CONTROL UNIT GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EPS control unit harness connector.

3.

Check continuity between EPS control unit harness connector terminal and ground.

4.

Connect EPS control unit harness connector.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

2.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (1)

1.

Check voltage between EPS control unit harness connector terminals and ground.

2.

Turn ignition switch ON.

CAUTION:

Never start the engine.

3.

Check voltage between EPS control unit harness connector and ground.

DTC

Display item

Malfunction detected condition

Possible cause

C1601

BATTERY VOLT

When a power supply voltage to the EPS control unit 
is maintained at 17.5 V or more or at less than 9V 
continuously for five second or more.

• Harness or connector
• EPS control unit

EPS control unit

—

Continuity

Connector

Terminal

E36

18

Ground

Existed

EPS control unit

—

Voltage

Connector

Terminal

M37

4

Ground

Approx. 0 V

STC-20

< DTC/CIRCUIT DIAGNOSIS >

C1601 BATTERY POWER SUPPLY

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (2)

1.

Turn ignition switch OFF.

2.

Check the 10A fuse (#3).

3.

Check the harness for open or short between EPS control unit harness connector No.4 terminal and the
10A fuse (#3).

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for ignition power supply circuit. Refer to 

PG-19, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (3)

1.

Turn ignition switch OFF.

2.

Check voltage between EPS control unit harness connector terminals and ground.

3.

Turn ignition switch ON.

CAUTION:

Never start the engine.

4.

Check voltage between EPS control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (4)

1.

Turn ignition switch OFF.

2.

Check the 60A fusible link (J).

3.

Check the harness for open or short between EPS control unit harness connector No.17 terminal and the
60A fusible link (J).

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

PG-10, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

6.

CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

Disconnect torque sensor 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-34, "Exploded View"

.

NO

>> Repair or replace error-detected parts.

EPS control unit

—

Voltage

Connector

Terminal

M37

4

Ground

Battery voltage

EPS control unit

—

Voltage

Connector

Terminal

E36

17

Ground

Battery voltage

EPS control unit

—

Voltage

Connector

Terminal

E36

17

Ground

Battery voltage

C1604 TORQUE SENSOR

STC-21

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

H

I

J

K

L

M

A

B

STC

N

O

P

C1604 TORQUE SENSOR

DTC Logic

INFOID:0000000005912724

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

With CONSULT-III

1.

Turn the ignition switch OFF to ON.

2.

Perform “EPS” self-diagnosis.

Is DTC “C1604” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-21, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005912725

1.

CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF to ON.

CAUTION:

Never start the engine.

2.

Check voltage between torque sensor harness connector terminals and ground.

CAUTION:

Steering wheel is neutral position. (There is no steering force.)

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Perform the trouble diagnosis for battery power supply circuit. Refer to 

STC-19, "Diagnosis Proce-

dure"

.

2.

CHECK TORQUE SENSOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Check continuity between torque sensor harness connector terminal and ground.

CAUTION:

Steering wheel is neutral position. (There is no steering force.)

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair open circuit or short to ground or short to power in harness or connectors.

3.

CHECK TORQUE SENSOR SIGNAL

1.

Turn ignition switch OFF to ON.

2.

Check continuity between torque sensor harness connector terminal and ground.

CAUTION:

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

Torque sensor

—

Voltage

Connector

Terminal

M327

13

Ground

Approx. 5 V

Torque sensor

—

Continuity

Connector

Terminal

M327

15

Ground

Existed

STC-22

< DTC/CIRCUIT DIAGNOSIS >

C1604 TORQUE SENSOR

Steering wheel is neutral position. (There is no steering force.)

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

ST-11, "Exploded

View"

.

4.

CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

Disconnect torque sensor 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-34, "Exploded View"

.

NO

>> Repair or replace error-detected parts.

Torque sensor

—

Continuity

Connector

Terminal

M327

14

Ground

Approx. 2.5 V

16