system NISSAN TIIDA 2011 Service Repair Manual

TROUBLE DIAGNOSISSRS-27
< SYMPTOM DIAGNOSIS >
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PRE-TEN FRONT LH [OPEN]
[B1086] The circuit for front LH seat belt pre-tensioner is open. 1. Visually check the wiring harness
connections.
2. Replace the harness if it has visi- ble damage.
3. Replace front LH seat belt pre- tensioner.
4. Replace the air bag diagnosis
sensor unit.
5. Replace the related harness.
PRE-TEN FRONT LH
[VB-SHORT]
[B1087] The circuit for front LH seat belt pre-tensioner is shorted to
some power supply circuit.
PRE-TEN FRONT LH [GND-SHORT] [B1088] The circuit for front LH seat belt pre-tensioner is shorted to
ground.
PRE-TEN FRONT LH [SHORT][B1089] The circuits for the front LH seat belt pre-tensioner are shorted
to each other.
PRE-TEN FRONT RH [OPEN]
[B1081] The circuit for front RH seat belt pre-tensioner is open. 1. Visually check the wiring harness
connections.
2. Replace the harness if it has visi- ble damage.
3. Replace front RH seat belt pre-
tensioner.
4. Replace the air bag diagnosis sensor unit.
5. Replace the related harness.
PRE-TEN FRONT RH
[VB-SHORT][B1082] The circuit for front RH seat belt pre-tensioner is shorted to
some power supply circuit.
PRE-TEN FRONT RH [GND-SHORT][B1083] The circuit for front RH seat belt pre-tensioner is shorted to
ground.
PRE-TEN FRONT RH [SHORT]
[B1084] The circuits for the front RH seat belt pre-tensioner are short-
ed to each other.
CURTAIN MODULE LH [OPEN][B1150] The LH side curtain air bag module circuit is open.
1. Visually check the wiring harness
connection.
2. Replace the harness if it has visi-
ble damage.
3. Replace LH side curtain air bag module.
4. Replace the air bag diagnosis sensor unit.
5. Replace the related harness.
CURTAIN MODULE LH
[VB-SHORT][B1151] The LH side curtain air bag module circuit is shorted to some
power supply circuits.
CURTAIN MODULE LH [GND-SHORT]
[B1152] The LH side curtain air bag module circuit is shorted to
ground.
CURTAIN MODULE LH [SHORT][B1153] The circuits for the LH side curtain air bag module are shorted
to each other.
CURTAIN MODULE RH [OPEN]
[B1145] The RH side curtain air bag module circuit is open.
1. Visually check the wiring harness
connection.
2. Replace the harness if it has visi- ble damage.
3. Replace RH side curtain air bag
module.
4. Replace the air bag diagnosis sensor unit.
5. Replace the related harness.
CURTAIN MODULE RH
[VB-SHORT][B1146] The RH side curtain air bag module circuit is shorted to some
power supply circuits.
CURTAIN MODULE RH [GND-SHORT][B1147] The RH side curtain air bag module circuit is shorted to
g
rou

nd.
CURTAIN MODULE RH [SHORT]
[B1148] The circuits for the RH side curtain air bag module are shorted
to each other.
CONTROL UNIT [B1XXX] Air bag diagnosis sensor unit is malfunctioning.
1. Visually check the wiring harness
connection.
2. Replace the air bag diagnosis
sensor unit.
OCCUPANT SENS C/U [UNIT FAIL]
[B1017] or [B1021] The OCS control unit is malfunctioning.
1. Replace RH front seat cushion/
occupant classification system
control unit assembly.
Diagnostic item
Explanation Repair order
Recheck SRS at each replacement
Revision: May 2010 2011 Versa

OCCUPANT CLASSIFICATION SYSTEM CONTROL UNITSRS-47
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OCCUPANT CLASSIFICATION SYSTEM CONTROL UNIT
Removal and InstallationINFOID:0000000005931220
The occupant classification system control unit, occupant classification system sensor, and bladder are an
integral part of the front passenger seat cushion and are replaced as an assembly. Refer to SE-11
to remove
the seat, and SE-13, "
Disassembly and Assembly" to replace the seat cushion.
Revision: May 2010 2011 Versa

SRS-48
< ON-VEHICLE REPAIR >
COLLISION DIAGNOSIS
COLLISION DIAGNOSIS
For Frontal CollisionINFOID:0000000005931221
FOR FRONTAL COLLISION: When SRS is activated in a collision
CAUTION:
Due to varying models and option levels, not all parts listed in the chart below apply to all vehicles.
WORK PROCEDURE
1. Before performing any of the following steps, ensure that all vehicle body and structural repairs have been
completed.
2. Replace the diagnosis sensor unit.
3. Remove the front air bag modules, crash zone sens or assembly, bracket and seat belt pre-tensioner
assemblies.
4. Check the SRS components using the table below: Replace any SRS components showing visible signs of damage. (dents, cracks and deformation, etc.)
5. Install new front air bag modules, crash zone sens or assembly, bracket and seat belt pre-tensioner
assemblies.
6. Perform self-diagnosis using CONSULT-III or air bag warning lamp. Refer to SRS-18, "
Self-Diagnosis
Function (Without CONSULT-III)" for details.
Ensure entire SRS operates properly.
7. After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to SRS-19, "
SRS Operation Check".
SRS INSPECTION (FOR FRONTAL COLLISION)
Part Inspection
Driver air bag module If the driver air bag has deployed:
REPLACE
Install with new fasteners.
Front passenger air bag module
(if equipped) If the front passenger air bag has deployed:
REPLACE
Install with new fasteners.
Crash zone sensor If any of the front air bags or seat belt pre-tensioners* have been activated:
REPLACE the crash zone sensor and bracket with new fasteners.
*: Confirm seat belt pre-tensioner activation using CONSULT-III only.
Seat belt pre-tensioner assem-
blies
(All applicable locations: buckle,
retractor, lap outer) If either the driver or passenger seat belt pre-tensioner* has been activated:
REPLACE all seat belt pre-tensioner assemblies with new fasteners.
*: Confirm seat belt pre-tensioner activation using CONSULT-III only.
Diagnosis sensor unit If any of the SRS components have been activated:
REPLACE the diagnosis sensor unit.
Install with new fasteners.
Steering wheel 1. Visually check steering wheel for deformities.
2. Check harness (built into steering wheel) and connectors for damage, and terminals for de- formities.
3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.
4. Check steering wheel for excessive free play.
5. If no damage is found, reinstall.
6. If damaged—REPLACE.
Spiral cable If the driver front air bag has deployed:
REPLACE the spiral cable.
Occupant classification system
(Passenger seat) 1. Remove passenger seat assembly.
2. Check control unit case for dents, cracks of deformities.
3. Check connectors and pressure sensor tube for damage, and terminals for deformities.
4. Check seat frame and cushion pan for dents or deformities.
5. If no damage is found, reinstall seat with new fasteners.
6. If damaged — REPLACE seat cushion assembly with new fasteners.
Revision: May 2010
2011 Versa

SRS-50
< ON-VEHICLE REPAIR >
COLLISION DIAGNOSIS
For Side and Ro llover Collision
INFOID:0000000005931222
FOR SIDE AND ROLLOVER COLLISION: Wh en SRS is activated in a collision
CAUTION:
Due to varying models and option levels, not all part s listed in the chart below apply to all vehicles.
WORK PROCEDURE
1. Before performing any of the following steps, ensure that all vehicle body and structural repairs have been
completed.
2. Replace the following components:
- Front seat back assembly (on the side on which side air bag is activated).
- Door finisher (on the side on which door-mounted curtain air bag is activated).
- Pop-up roll bar assemblies and pop-up roll bar covers.
- Side air bag (satellite) sensor LH/RH (on the side on which side air bag is activated).
- Diagnosis sensor unit.
- Seat belt pre-tensioner assemblies.
3. Check the SRS components and the related parts using the following table. Replace any SRS components and the related parts showing visible signs of damage (dents, cracks,
deformation, etc.).
4. Perform self-diagnosis using CONSULT-III and “AIR BAG” warning lamp. Refer to SRS-19, "
SRS Opera-
tion Check" for details. Make sure entire SRS operates properly.
5. After the work is completed, perform self-diagnosis to check that no malfunction is detected. Refer to SRS-18, "
Self-Diagnosis Function (Without CONSULT-III)".
SRS INSPECTION (FOR SIDE AND ROLLOVER COLLISION)
Diagnosis sensor unit If none of the SRS components have been activated:
1. Check case for dents, cracks or deformities.
2. Check connectors for damage, and terminals for deformities.
3. If no damage is found, reinstall with new fasteners.
4. If damaged—REPLACE. Install diagnosis sensor unit with new fasteners.
Steering wheel 1. Visually check steering wheel for deformities.
2. Check harness (built into steering wheel) and connectors for damage, and terminals for defor- mities.
3. Install driver air bag module into the steering wheel to check fit and alignment with the wheel.
4. Check steering wheel for excessive free play.
5. If no damage is found, reinstall.
6. If damaged—REPLACE.
Spiral cable If the driver front air bag has not deployed:
1. Visually check spiral cable and combination switch for damage.
2. Check connectors and protective tape for damage.
3. Check steering wheel for noise, binding or heavy operation.
4. If no damage is found, reinstall.
5. If damaged—REPLACE.
Occupant classification system
(Passenger seat) 1. Remove passenger seat assembly.
2. Check control unit case for dents, cracks of deformities.
3. Check connectors and pressure sensor tube for damage, and terminals for deformities.
4. Check seat frame and cushion pan for dents or deformities.
5. If no damage is found, reinstall seat with new fasteners.
6. If damaged — REPLACE seat cushion assembly with new fasteners.
Harness and connectors 1. Check connectors for poor connection, damage, and terminals for deformities.
2. Check harness for binding, chafing, cuts, or deformities.
3. If no damage is found, reinstall the harness and connectors.
4. If damaged—REPLACE the damaged harness. Do not attempt to repair, splice or modify any
SRS harness.
Instrument panel assembly If the passenger front air bag has NOT deployed: 1. Visually check instrument panel for damage.
2. If no damage is found, reinstall the instrument panel assembly.
3. If damaged—REPLACE the instrument panel assembly.
Part
Inspection
Revision: May 2010 2011 Versa

STC-1
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CONTENTS
STEERING CONTROL SYSTEM
EPS
BASIC INSPECTION ....... .............................
3
DIAGNOSIS AND REPAIR WORKFLOW ..... .....3
Work Flow ........................................................... ......3
SYSTEM DESCRIPTION ..............................5
EPS SYSTEM ... .............................................. .....5
System Diagram .................................................. ......5
System Description ...................................................5
Component Parts Location ........................................6
Component Description .............................................6
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
.....
8
CONSULT-III Function ........................................ ......8
DTC/CIRCUIT DIAGNOSIS ..........................9
C1601 BATTERY POWER SUPPLY ..................9
Description .......................................................... ......9
DTC Logic .................................................................9
Diagnosis Procedure .................................................9
C1604 TORQUE SENSOR .................................11
Description ..............................................................11
DTC Logic ...............................................................11
Diagnosis Procedure ...............................................11
C1606 EPS MOTOR ...........................................13
Description .......................................................... ....13
DTC Logic ...............................................................13
Diagnosis Procedure ...............................................13
Component Inspection ............................................13
C1607, C1608 EPS CONTROL UNIT ................15
Description .......................................................... ....15
DTC Logic ...............................................................15
Diagnosis Procedure ...............................................15
C1609 VEHICLE SPEED SIGNAL .....................16
Description ........................................................... ....16
DTC Logic ................................................................16
Diagnosis Procedure ...............................................16
C1610 ENGINE STATUS SIGNAL ...................17
Description ...............................................................17
DTC Logic ................................................................17
Diagnosis Procedure ...............................................17
U1000 CAN COMM CIRCUIT ...........................18
Description ...............................................................18
DTC Logic ................................................................18
Diagnosis Procedure ...............................................18
EPS WARNING LAMP ......................................19
Description ...............................................................19
Component Function Check ....................................19
Diagnosis Procedure ...............................................19
ECU DIAGNOSIS INFORMATION ..............20
EPS CONTROL UNIT .......................................20
Reference Value .................................................. ....20
Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - ............
22
Fail-Safe .............................................................. ....23
DTC Inspection Priority Chart ..................................24
DTC Index ...............................................................24
SYMPTOM DIAGNOSIS ..............................25
EPS WARNING LAMP DOES NOT TURN ON ...25
Description ........................................................... ....25
Diagnosis Procedure ...............................................25
EPS WARNING LAMP DOES NOT TURN
OFF ....................................................................
26
Description ...............................................................26
Diagnosis Procedure ...............................................26
STEERING WHEEL TURNING FORCE IS
HEAVY OR LIGHT ............................................
27
Revision: May 2010 2011 Versa

STC-2
Description ..............................................................27
Diagnosis Procedure ..............................................27
UNBALANCE STEERING WHEEL TURNING
FORCE AND RETURN BETWEEN RIGHT
AND LEFT ..........................................................
28
Description ..............................................................28
Diagnosis Procedure ..............................................28
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) .......................
29
Description ........................................................... ...29
Diagnosis Procedure ............................................ ...29
PRECAUTION ............................................30
PRECAUTIONS .............................................. ...30
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
30
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ..................................
30
Service Notice or Precaution for EPS System ........31
Revision: May 2010 2011 Versa

DIAGNOSIS AND REPAIR WORKFLOWSTC-3
< BASIC INSPECTION > [EPS]
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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

EPS SYSTEMSTC-5
< SYSTEM DESCRIPTION > [EPS]
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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

STC-6
< SYSTEM DESCRIPTION >[EPS]
EPS SYSTEM
Component Parts Location
INFOID:0000000005931226
Component DescriptionINFOID:0000000005931227
Combination meter • Transmits mainly the following signals to EPS control unit via CAN communication.
Vehicle speed signal
• EPS warning lamp si gnal is received from the EPS co ntrol unit via CAN communication.
TCM (Without ABS) Transmits the following si
gnals via CAN communicatio n to EPS control until.
Engine status signal
• Vehicle speed signal
Control unit
Signal status
SGIA1623E
Components parts Reference
EPS control unit STC-15, "
Description"
EPS motorSTC-13, "Description"
Torque sensor STC-11, "Description"
Revision: May 2010 2011 Versa

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 column shaft.
EPS warning lamp STC-19, "
Description"
Components partsReference
Revision: May 2010 2011 Versa