2011 NISSAN TIIDA Service Repair Manual

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NISSAN TIIDA 2011 Service Repair Manual STC-2
Description ..............................................................27
Diagnosis Procedure ..............................................27
UNBALANCE STEERING WHEEL TURNING
FORCE AND RET

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NISSAN TIIDA 2011 Service Repair Manual DIAGNOSIS AND REPAIR WORKFLOWSTC-3
< BASIC INSPECTION > [EPS]
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000005931223
1.OBTAIN INFORMATION ABO

DIAGNOSIS AND REPAIR WORKFLOWSTC-3
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000005931223
1.OBTAIN INFORMATION ABOUT SYMPTOM
Interview the customer to obtain as much informa tion as possible about the conditions and environment under
which the malfunction occurs.
>> GO TO 2.
2.CHECK DTC
1. Check for DTC.
2. If a DTC exists, perform the following operations.
- Records the DTCs.
- Erase DTCs
- Check that the root cause clarified with DTC matches to the malfunction information described by the cus-
tomer.
3. Check also the related service information or others.
Do malfunction information or DTC exist?
Malfunction information and DTC exist. >>GO TO 3.
Malfunction information exists but no DTC. >>GO TO 4.
No malfunction information, but DTC exists. >>GO TO 5.
3.REPRODUCE THE MALFUNCTION INFORMATION
Check the malfunction described by the customer on the vehicle.
Record the status of each signal when a symptom occurs with “Data Monitor” in CONSULT-III.
Inspect the relation of the information and the condition when it occurs.
>> GO TO 5.
4.CHECK THE MALFUNCTION
Check the malfunction described by the customer on the vehicle.
Record the status of each signal when a symptom occurs with “Data Monitor” in CONSULT-III.
Inspect the relation of the information and the condition when it occurs.
>> GO TO 6.
5.PERFORM “DTC CONFIRMATION PROCEDURE”
Perform the “DTC conformation procedure” to the det ected DTC and check that the DTC is detected again.
Refer to STC-24, "
DTC Inspection Priority Chart" when multiple DTCs are detected, and then judge the order
for performing the diagnosis.
Is any DTC detected?
YES >> GO TO 7.
NO >> Follow GI-9, "
How to Follow Trouble Diagnosis" to check.
6.IDENTIFY MALFUNCTIONING SYST EM WITH “SYMPTOM DIAGNOSIS”
Use the “Symptom diagnosis” from the symptom inspection result in step 4. Then identify where to start per-
forming the diagnosis based on the pos sible causes and the symptoms.
>> GO TO 7.
7.IDENTIFY MALFUNCTIONING PART S WITH “COMPONENT DIAGNOSIS”
Perform the inspection with the “component diagnosis” of the applicable system.
NOTE:
The “component diagnosis” mainly consists of the check for an open circuit.
Revision: May 2010 2011 Versa

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NISSAN TIIDA 2011 Service Repair Manual STC-4
< BASIC INSPECTION >[EPS]
DIAGNOSIS AND REPAIR WORKFLOW
The circuit check in the diagnosis procedure also requires the check for a short circuit. Refer to
GI-25, "How to
Perform Efficient Diagn

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NISSAN TIIDA 2011 Service Repair Manual EPS SYSTEMSTC-5
< SYSTEM DESCRIPTION > [EPS]
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SYSTEM DESCRIPTION
EPS SYSTEM
System DiagramINFOID:0000000005931224
System DescriptionINFOID:0000000005931225
• EPS con

EPS SYSTEMSTC-5
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SYSTEM DESCRIPTION
EPS SYSTEM
System DiagramINFOID:0000000005931224
System DescriptionINFOID:0000000005931225
• EPS control unit performs an arithmetical operation on data, such as steering wheel turning force (sensor
signal) from the torque sensor, vehicle speed signal, etc. Then it generates an optimum assist torque signal
to the EPS motor according to the driving condition.
• EPS control unit decreases the output signal to EPS mo tor while extremely using the power steering func-
tion (e.g., full steering) consecutively for protec ting EPS motor and EPS control unit (Overload protection
control). While activating overload protection control, the assist torque gradually decreases, and the steering
wheel turning force becomes heavy. The normal assist torque reactivates by no steering.
• In case of an error in the electrical system, the fail- safe function stops output signals to the EPS motor. Then
the previous state is changed to the manual steering state.
• Self-diagnosis can be done with CONSULT-III.
• EPS control unit will decrease assistance under the following 2 conditions.
- Extensive steering at low speed will cause the ECU and MOTOR to heat up, once temperature reaches crit-
ical point ECU will reduce current to reduce heat up. System will recover as temperature lowers (reduced or
no assistance).
- Holding steering on rack-end (full lock) for 1 second will cause the system to engage rack-end protection. This reduces assistance down to 50% in order to prevent heat up. Assistance is immediately returned to
100% when steering released or turned away from rack-end.
- Communicates the signal from each control unit via CAN communication.
WGIA0187E
Control unit Signal status
ECM Transmits mainly the follow
ing signals to EPS control uni t via CAN communication.
Engine status signal
ABS actuator and electric unit
(control unit) Transmits mainly the follow
ing signals to EPS control uni t via CAN communication.
Vehicle speed signal
Revision: May 2010 2011 Versa

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NISSAN TIIDA 2011 Service Repair Manual STC-6
< SYSTEM DESCRIPTION >[EPS]
EPS SYSTEM
Component Parts Location
INFOID:0000000005931226
Component DescriptionINFOID:0000000005931227
Combination meter • Transmits mainly the following signals

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NISSAN TIIDA 2011 Service Repair Manual EPS SYSTEMSTC-7
< SYSTEM DESCRIPTION > [EPS]
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Reduction gear Reduction gear increa
ses the assist torque provided from EPS
motor with worm gears, and outputs to the c

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NISSAN TIIDA 2011 Service Repair Manual STC-8
< SYSTEM DESCRIPTION >[EPS]
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
DIAGNOSIS SYSTEM
(EPS CONTROL UNIT)
CONSULT-III FunctionINFOID:0000000005931228
FUNCTION
CONSULT-III can display each diagnostic

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NISSAN TIIDA 2011 Service Repair Manual C1601 BATTERY POWER SUPPLYSTC-9
< DTC/CIRCUIT DIAGNOSIS > [EPS]
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DTC/CIRCUIT DIAGNOSIS
C1601 BATTERY POWER SUPPLY
DescriptionINFOID:0000000005931229
Power is supplied

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