Nissan Qashqai (2007-2010). Manual - part 756

EPS CONTROL UNIT

STC-23

< ECU DIAGNOSIS >

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Items (CONSULT screen terms)

Reference

C1601

BATTERY VOLT

STC-8, "Description"

C1604

TORQUE SENSOR

STC-10, "Description"

C1606

EPS MOTOR

STC-11, "Description"

C1607

EEPROM

STC-12, "Description"

C1608

CONTROL UNIT

STC-13, "Description"

U1200

CAN VHCL SPEED (ABS)

STC-15, "Description"

U14FF

CAN VHCL SPEED (METER)

STC-16, "Description"

U1000

CAN COMM CIRCUIT

STC-17, "Description"

STC-24

< SYMPTOM DIAGNOSIS >

EPS WARNING LAMP DOES NOT TURN ON

SYMPTOM DIAGNOSIS

EPS WARNING LAMP DOES NOT TURN ON

Diagnosis Procedure

INFOID:0000000000940534

1.

CHECK SYSTEM FOR CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

STC-7, "CONSULT-III Function (EPS)"

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Is the “CAN COMM CIRCUIT [U1000]” displayed?

YES

>> Perform trouble diagnosis for CAN communication line.

NO

>> GO TO 2.

2.

CHECK EPS CONTROL UNIT

Check EPS control unit input/output signal. Refer to 

STC-18, "Reference Value"

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Is the inspection result normal?

YES

>> GO TO 3.

NO

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

any items are damaged, repair or replace damaged parts.

3.

CHECK COMBINATION METER SELF-DIAGNOSIS RESULTS

Perform combination meter self-diagnosis. Refer to 

MWI-23, "CONSULT-III Function (METER/M&A)"

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is self-diagnosis results indicated?

YES

>> Repair or replace malfunctioning components.

NO

>> GO TO 4.

4.

SYMPTOM CHECK

Check again.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace combination meter.

EPS WARNING LAMP DOES NOT TURN OFF

STC-25

< SYMPTOM DIAGNOSIS >

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EPS WARNING LAMP DOES NOT TURN OFF

Diagnosis Procedure

INFOID:0000000000940536

1.

CHECK SELF-DIAGNOSIS RESULTS

Perform self-diagnosis. Refer to 

STC-7, "CONSULT-III Function (EPS)"

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Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 2.

2.

CHECK 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.

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 EPS CONTROL UNIT PIN TERMINAL

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

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts.

5.

CHECK COMBINATION METER SELF-DIAGNOSIS RESULTS

Perform combination meter self-diagnosis. Refer to 

MWI-23, "CONSULT-III Function (METER/M&A)"

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is self-diagnosis results indicated?

YES

>> Repair or replace malfunctioning components.

EPS control unit

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Voltage

Connector

Terminal

M38

1

Ground

Battery voltage

M37

10

EPS control unit

—

Voltage

Connector

Terminal

M38

1

Ground

Battery voltage

M37

10

Approx. 0 V

EPS control unit

—

Continuity

Connector

Terminal

M38

2

Ground

Existed

STC-26

< SYMPTOM DIAGNOSIS >

EPS WARNING LAMP DOES NOT TURN OFF

NO

>> GO TO 6.

6.

CHECK VEHICLE SPEED SIGNAL FROM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Perform self-diagnosis with ABS actuator and electric unit (control unit).
• Without ESP models: 

BRC-17, "CONSULT-III Function (ABS)"

• With ESP models: 

BRC-96, "CONSULT-III Function (ABS)"

Is any malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 7.

7.

CHECK ENGINE STATUS SIGNAL

Perform self-diagnosis with ECM.
• HR16DE (with EURO-OBD): 

EC-100, "CONSULT-III Function"

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• HR16DE (Without EURO-OBD): 

EC-430, "CONSULT-III Function"

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• MR20DE (with EURO-OBD): 

EC-719, "CONSULT-III Function"

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• MR20DE (without EURO-OBD): 

EC-1054, "CONSULT-III Function"

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• K9K: 

EC-1315, "Diagnosis Description"

Is the malfunction detected by self-diagnosis?

YES

>> Check the malfunctioning system.

NO

>> GO TO 8.

8.

SYMPTOM CHECK

Check again.
Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace combination meter. Refer to 

MWI-72, "Exploded View"

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