Nissan Qashqai (2007-2010). Manual — part 752
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
STC-7
< FUNCTION DIAGNOSIS >
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DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
CONSULT-III Function (EPS)
INFOID:0000000000949820
FUNCTION
CONSULT-III can display each diagnostic item using the diagnostic test modes shown following.
SELF-DIAG RESULTS MODE
Display Item List
.
DATA MONITOR MODE
Display Item List
Diagnostic test mode
Function
Self-diagnostic results
Self-diagnostic results can be read and erased quickly.
Data monitor
Input/Output data in the EPS control unit can be read.
ECU part number
EPS control unit part number can be read.
CAN diagnostic support monitor
The results of transmit/receive diagnosis of CAN communication can be read.
Monitor item (Unit)
Remarks
BATTERY VOLT (V)
Displays the power supply voltage for EPS control unit.
TORQUE SENSOR (Nm)
Displays steering wheel turning force detected by torque sensor.
MOTOR SIG (A)
Displays the current commanded value to EPS motor.
MOTOR CURRENT (A)
Displays the current value consumed by EPS motor.
ASSIST TORQUE (Nm)
Displays assist torque being output by the electric power steering.
C/U TEMP (
°
C)
Displays the temperature of the EPS control unit.
ASSIST LEVEL (%)
Normally displays 100%. In case of an excessive stationary steering, the assist
curvature gradually falls. However, it return to 100% when left standing.
VEHICLE SPEED (km/h) or (MPH)
Vehicle speed is displayed from vehicle speed signal with CAN communication.
WARNING LAMP (On/Off)
EPS warning lamp control status is displayed.
ENGINE STATUS (STOP/RUN)
Engine speed is displayed from engine status signal with CAN communication.
MOTOR TEMP (
°
C)
Displays the temperature of EPS motor.
VHCL SPD CALC (km/h) or (MPH)
Displays vehicle speeds used for controlling EPS.
STC-8
< COMPONENT DIAGNOSIS >
C1601 BATTERY POWER SUPPLY
COMPONENT DIAGNOSIS
C1601 BATTERY POWER SUPPLY
Description
INFOID:0000000000940491
Power is supplied from the battery to EPS control unit.
DTC Logic
INFOID:0000000000940492
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:0000000000940494
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 connector and then perform self-diagnosis. Refer to
STC-7, "CONSULT-III Function (EPS)"
Is any item indicated on the self-diagnosis display?
YES
>> GO TO 2.
NO
>> Poor connection of connector terminal. Repair or replace connector.
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.
DTC
Display item
Malfunction detected condition
Possible cause
C1601
BATTERY VOLT
When the power supply malfunction supplied to EPS
control unit is detected.
• Harness or connector
• EPS control unit
Self-diagnosis results
BATTERY VOLT
EPS control unit
—
Voltage
Connector
Terminal
M38
1
Ground
Battery voltage
M37
10
C1601 BATTERY POWER SUPPLY
STC-9
< COMPONENT DIAGNOSIS >
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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:0000000000956134
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
M38
1
Ground
Battery voltage
M37
10
Approx. 0 V
EPS control unit
—
Continuity
Connector
Terminal
M38
2
Ground
Existed
STC-10
< COMPONENT DIAGNOSIS >
C1604 TORQUE SENSOR
C1604 TORQUE SENSOR
Description
INFOID:0000000000940497
Torque sensor detects the steering torque, and transmit the signal to EPS control unit.
DTC Logic
INFOID:0000000000940498
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:0000000000940499
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. Refer to
.
Is the “TORQUE SENSOR” [C1604] displayed?
YES
>> Torque sensor is malfunction. Replace steering column assembly.
NO
>> Poor connection of connector terminal. Repair or replace connector.
Special Repair Requirement
INFOID:0000000000956143
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
C1604
TORQUE SENSOR
Malfunction of the torque sensor in steering column
assembly is detected.
• Harness or connector
• Torque sensor
• EPS control unit
Self-diagnosis results
TORQUE SENSOR
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