Nissan Qashqai (2007-2010). Manual - part 753

C1606 EPS MOTOR

STC-11

< COMPONENT DIAGNOSIS >

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C1606 EPS MOTOR

Description

INFOID:0000000000940502

EPS motor provides the assist torque by control signal from EPS control unit.

DTC Logic

INFOID:0000000000940503

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-11, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000940504

1.

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.

4.

Reconnect connectors and then perform the self-diagnosis.

Is the “EPS MOTOR” [C1606] displayed?

YES

>> EPS motor malfunctions. Replace steering column assembly.

NO

>> Poor connection of connector terminal. Repair or replace connector.

Special Repair Requirement

INFOID:0000000000956144

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the EPS control
unit. Refer to 

BRC-78, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Descrip-

tion"

. (With ESP models)

>> 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

Self-diagnosis results

EPS MOTOR

STC-12

< COMPONENT DIAGNOSIS >

C1607 EEPROM

C1607 EEPROM

Description

INFOID:0000000000940507

EPS control unit incorporates a memory function.

DTC Logic

INFOID:0000000000940508

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-12, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000940509

1.

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.

4.

Reconnect connectors and then perform the self-diagnosis.

Is the “EEPROM” [C1607] displayed?

YES

>> EEPROM malfunctions. Replace steering column assembly. Refer to 

ST-10, "Exploded View"

.

NO

>> Poor connection of connector terminal. Repair or replace connector.

Special Repair Requirement

INFOID:0000000000956145

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the EPS control
unit. Refer to 

BRC-78, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Descrip-

tion"

. (With ESP models)

>> END

DTC

Display item

Malfunction detected condition

Possible cause

C1607

EEPROM

When the memory (EEPROM) system malfunction is 
detected in EPS control unit.

• Harness or connector
• EPS control unit

Self-diagnosis results

EEPROM

C1608 CONTROL UNIT

STC-13

< COMPONENT DIAGNOSIS >

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C1608 CONTROL UNIT

Description

INFOID:0000000000940512

EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor sig-
nal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque to the EPS
motor according to the driving condition.

DTC Logic

INFOID:0000000000940513

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis dislay?

YES

>> Proceed to diagnosis procedure. Refer to 

STC-13, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000000940514

1.

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.

4.

Reconnect connectors and then perform self-diagnosis.

Is any item indicated on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> Poor connection of connector terminal. Repair or replace connector.

2.

EPS CONTROL UNIT POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect EPS control unit harness connector.

3.

Turn ignition switch ON. (Do not start engine.)

4.

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

5.

Turn ignition switch OFF.

6.

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

DTC

Display item

Malfunction detected condition

Possible cause

C1608

CONTROL UNIT

When the internal malfunction is detected in EPS 
control unit.

• Harness or connector
• EPS control unit

Self-diagnosis results

CONTROL UNIT

EPS control unit

—

Voltage

Connector

Terminal

E38

1

Ground

Battery voltage

E37

10

STC-14

< COMPONENT DIAGNOSIS >

C1608 CONTROL UNIT

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning components.

3.

CHECK EPS CONTROL UNIT GROUND CIRCUIT

1.

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

2.

Connect EPS control unit harness connector.

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK DTC

Start engine.

Does EPS warning lamp turn OFF?

YES

>> EPS control unit is malfunction. Replace steering column assembly.

NO

>> Perform self-diagnosis, repair or replace damaged parts.

Special Repair Requirement

INFOID:0000000000956146

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the EPS control
unit. Refer to 

BRC-78, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION : Descrip-

tion"

. (With ESP models)

>> END

EPS control unit

—

Voltage

Connector

Terminal

E38

1

Ground

Battery voltage

E37

10

Approx. 0 V

EPS control unit

—

Continuity

Connector

Terminal

E38

2

Ground

Existed