Nissan Altima HL32 Hybrid. Manual - part 1059

C1604 TORQUE SENSOR

STC-15

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C1604 TORQUE SENSOR

Description

INFOID:0000000004212831

Torque sensor detects steering wheel turning force and outputs sensor signal to EPS control unit.

DTC Logic

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DTC DETECTION LOGIC

NOTE:
C1604 may be detected also for malfunctions other than EPS system components.

DTC CONFIRMATION PROCEDURE

1.

ERASE DTC MEMORY

 With CONSULT-III

1. Record DTC.

2. Erase DTC once.

NOTE:

After erasing DTC record, currently occurred DTC can be detected by reading out DTC again.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION

 With CONSULT-III

1. Turn the ignition switch ON (READY).

2. Steer 360

° leftward and rightward slowly.

3. Return the steering wheel to the straight-ahead position.

4. Perform the self-diagnosis.
Is DTC “C1604” detected?

YES

>> Proceed to 

STC-15, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004212833

1.

CHECK TORQUE SENSOR CIRCUIT

1. Turn the ignition switch OFF.

2. Disconnect EPS control unit harness connector and torque sensor harness connector.

3. Check the continuity between EPS control unit harness connec-

tor and torque sensor harness connector.

DTC

Item

(CONSULT-III screen term)

DTC detecting condition

Possible cause

C1604

TORQUE SENSOR

When the torque sensor malfunction built in steering 
gear assembly is detected.

• Torque sensor calibration in-

complete

• Harness or connector
• Torque sensor
• EPS control unit

PGIA0087E

STC-16

< COMPONENT DIAGNOSIS >

C1604 TORQUE SENSOR

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace the harnesses or connectors.

2.

CHECK TORQUE SENSOR

Check the resistance between torque sensor harness connector terminals. Refer to 

STC-17, "Component

Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

ST-12, "Removal and

Installation"

.

3.

CHECK EPS MOTOR ANGLE SENSOR INITIALIZATION AND TORQUE SENSOR CALIBRATION PER-

FORMED
Check if EPS motor angle sensor initialization and torque sensor calibration are performed before the self-

diagnosis.
Were the above items performed before the self-diagnosis?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

PERFORM SELF-DIAGNOSIS AGAIN

 With CONSULT-III

Perform “DTC CONFIRMATION PROCEDURE” (self-diagnosis) again. Refer to 

STC-15, "DTC Logic"

.

Which DTC is detected?

C1604 >> Replace EPS control unit. Refer to 

STC-58, "Removal and Installation"

.

Except C1604>>Check the malfunctioning system.

No DTC>>INSPECTION END

5.

INITIALIZE EPS MOTOR ANGLE SENSOR AND CALIBRATE TORQUE SENSOR AGAIN

 With CONSULT-III

Perform EPS motor angle sensor initialization and torque sensor calibration again. Refer to 

STC-5, "EPS

MOTOR ANGLE SENSOR INITIALIZATION AND TORQUE SENSOR CALIBRATION : Special Repair

Requirement"

.

Were they performed correctly?

YES

>> GO TO 6.

NO

>> Check the malfunctioning cause.

6.

PERFORM SELF-DIAGNOSIS AGAIN

 With CONSULT-III

Perform “DTC CONFIRMATION PROCEDURE” (self-diagnosis) again. Refer to 

STC-15, "DTC Logic"

.

Is DTC “C1604” detected?

YES

>> GO TO 7.

NO

>> INSPECTION END

7.

CHECK THE NUMBER OF WORK SUPPORT IMPLEMENTATIOS

EPS control unit

Torque sensor

Continuity

Connector

Terminal

Connector

Terminal

E326

19

E327

1

Existed

20

2

21

3

22

4

23

5

24

6

25

7

C1604 TORQUE SENSOR

STC-17

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Check the numbers of EPS motor angle sensor initialization and torque sensor calibration.
How many times were they implemented?

Once/twice>>GO TO 5.

More than twice>>Replace EPS control unit, refer to 

STC-58, "Removal and Installation"

. Then GO TO 8.

8.

INITIALIZE EPS MOTOR ANGLE SENSOR AND CALIBRATE TORQUE SENSOR AGAIN

 With CONSULT-III

Perform EPS motor angle sensor initialization and torque sensor calibration again. Refer to 

STC-5, "EPS

MOTOR ANGLE SENSOR INITIALIZATION AND TORQUE SENSOR CALIBRATION : Special Repair

Requirement"

.

Were they performed correctly?

YES

>> GO TO 9.

NO

>> Check the malfunctioning cause.

9.

PERFORM SELF-DIAGNOSIS AGAIN

 With CONSULT-III

Perform “DTC CONFIRMATION PROCEDURE” (self-diagnosis) again. Refer to 

STC-15, "DTC Logic"

.

Is DTC “C1604” detected?

YES

>> GO TO 10.

NO

>> INSPECTION END

10.

CHECK THE NUMBER OF WORK SUPPORT IMPLEMENTATIOS

Check the numbers of EPS motor angle sensor initialization and torque sensor calibration after replacement of

EPS control unit.
How many times were they implemented?

Once/twice>>GO TO 8.

More than twice>>Torque  sensor  is  malfunctioning. Replace steering gear assembly. Refer to 

ST-12,

"Removal and Installation"

.

Component Inspection

INFOID:0000000004212834

1.

CHECK TORQUE SENSOR

1. Turn the ignition switch OFF.

2. Disconnect torque sensor harness connector.

3. Check the resistance between torque sensor harness connector

terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

ST-12, "Removal and

Installation"

.

Special Repair Requirement

INFOID:0000000004212835

1.

INITIALIZE EPS MOTOR ANGLE SENSOR AND CALIBRATE TORQUE SENSOR AGAIN

Always perform EPS motor angle sensor initialization and torque sensor calibration after replacing EPS con-

trol unit or steering gear assembly. Refer to 

STC-5, "EPS MOTOR ANGLE SENSOR INITIALIZATION AND

TORQUE SENSOR CALIBRATION : Special Repair Requirement"

.

Torque sensor

 Resistance (Approx.)

Connector

Terminal

E327

1 – 6

90 – 170 

Ω

2 – 6

300 – 430 

Ω

4 – 6

90 – 170 

Ω

5 – 6

300 – 430 

Ω

3 – 7

4 – 14 

Ω

PGIA0088E

STC-18

< COMPONENT DIAGNOSIS >

C1604 TORQUE SENSOR

>> END