Nissan Versa Note. Manual - part 768

C1604 TORQUE SENSOR

STC-21

< DTC/CIRCUIT DIAGNOSIS >

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C1604 TORQUE SENSOR

DTC Logic

INFOID:0000000009667183

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 “C1604” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-21, "Diagnosis Procedure"

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NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009667184

Regarding Wiring Diagram information, refer to 

STC-11, "Wiring Diagram"

.

1.

CHECK TORQUE SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF to ON.

CAUTION:

Never start the engine.

2. Check voltage between EPS control unit harness connector terminal and ground.

CAUTION:

Steering wheel in 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-18, "Diagnosis Proce-

dure"

.

2.

CHECK TORQUE SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

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

CAUTION:

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

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

EPS control unit

—

Voltage

Connector

Terminal

M54

13

Ground

Approx. 5 V

STC-22

< DTC/CIRCUIT DIAGNOSIS >

C1604 TORQUE SENSOR

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 voltage between EPS control unit harness connector terminal and ground.

CAUTION:

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

3. Start the engine.

4. Check voltage between EPS control unit harness connector terminal and ground while turning the steer-

ing wheel.

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

ST-9, "Exploded

View"

.

4.

CHECK CONNECTOR

1. Turn ignition switch OFF.

2. Disconnect EPS control unit 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.

EPS control unit

—

Continuity

Connector

Terminal

M54

15

Ground

Yes

EPS control unit

—

Voltage

Connector

Terminal

M54

16

Ground

Approx. 2.5 V

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EPS control unit

—

Voltage

Connector

Terminal

M54

16

Ground

1.6 V – 3.4 V

(The value is changed according to 

steering left or right)

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C1606 EPS MOTOR

STC-23

< DTC/CIRCUIT DIAGNOSIS >

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C1606 EPS MOTOR

DTC Logic

INFOID:0000000009667185

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:0000000009667186

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, "Exploded View"

.

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:0000000009667187

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"

.