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
.
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-
. (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
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
.
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-
. (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
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-
. (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
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