NISSAN TIIDA 2007 Service Repair Manual

EPS CONTROL UNIT
STC-27
< ECU DIAGNOSIS >[EPS]
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Fail-Safe FunctionINFOID:0000000001697717
 If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on com-
bination meter turns ON to indicate system malfunction.
 When EPS warning lamp is ON, enters a manual steering state. (Control turning force steering wheel
becomes heavy.)
ALGIA0028GB

STC-28
< ECU DIAGNOSIS >[EPS]
EPS CONTROL UNIT
DTC Index
INFOID:0000000001716730
DTC Items (CONSULT screen terms) Reference
C1601 BATTERY POWER SUPPLYSTC-9
C1604 TORQUE SENSORSTC-11
C1606 EPS MOTORSTC-13
C1607 EEPROMSTC-15
C1608 EPS CONTROL UNITSTC-16
C1609 CAN VHCL SPEEDSTC-17
C1610 CAN ENG RPMSTC-19
U1000 CAN COMM CIRCUITSTC-21

EPS SYSTEM SYMPTOMS
STC-29
< SYMPTOM DIAGNOSIS >[EPS]
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SYMPTOM DIAGNOSIS
EPS SYSTEM SYMPTOMS
Symptom ChartINFOID:0000000001716771
If EPS warning lamp turns ON, perform self-diagnosis. Refer to STC-7, "CONSULT-III Function (EPS)".
Symptom Condition Check item Reference page
EPS warning lamp does not turn ON when ig-
nition switch to “ON”.
(EPS warning lamp check)Ignition switch: ONCAN communication line
STC-30
Combination meter
EPS warning lamp does not turn OFF for sev-
eral seconds after starting the engineEngine runningCAN communication line
STC-31
Power supply and ground for
EPS control unit
Torque sensor
EPS motor
Vehicle speed signal
Engine status signal
Combination meter
Steering wheel turning force is heavy or light,
while driving While driving
 Steering wheel turningCAN communication line
STC-33
Vehicle speed signal
Engine status signal
EPS motor
Steering wheel turning force
(Mechanical malfunction)
Unbalance steering wheel turning force and
return between right and left, while driving While driving
 Steering wheel turningWheel alignment
STC-34
Steering wheel turning force
(Mechanical malfunction)
Unbalance steering wheel turning force,
while driving (Torque variation) While driving
 Steering wheel turningSteering column intermediate
shaft installation condition
STC-35
Steering wheel turning force
(Mechanical malfunction)

STC-30
< SYMPTOM DIAGNOSIS >[EPS]
EPS WARNING LAMP DOES NOT TURN ON
EPS WARNING LAMP DOES NOT TURN ON
Diagnosis ProcedureINFOID:0000000001697733
SYMPTOM:
EPS warning lamp does not turn ON when ignition switch to “ON”.
DIAGNOSTIC PROCEDURE
1.CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to STC-7, "
CONSULT-III Function (EPS)" .
Is the
“CAN COMM CIRCUIT [U1000]” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to STC-21, "Diagnosis Procedure" .
NO >> GO TO 2.
2.CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-22, "
EPS Control Unit Input/Output Signal Reference
Va l u e" .
OK or NG
OK >> GO TO 3.
NG >> 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.SYMPTOM CHECK
Check again.
OK or NG
OK >>INSPECTION END
NG >> Replace combination meter. Refer to MWI-94, "
Removal and Installation".

EPS WARNING LAMP DOES NOT TURN OFF
STC-31
< SYMPTOM DIAGNOSIS >[EPS]
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EPS WARNING LAMP DOES NOT TURN OFF
Diagnosis ProcedureINFOID:0000000001697734
SYMPTOM:
EPS warning lamp does not turn OFF for several seconds after starting the engine.
DIAGNOSTIC PROCEDURE
1.CHECK SELF-DIAGNOSTIC RESULTS
Perform self-diagnosis. Refer to STC-7, "
CONSULT-III Function (EPS)".
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
M53 (A) terminal 10 and M54 (B) terminal 17 and ground.
5. Turn ignition switch OFF.
6. Check voltage between EPS control unit harness connector
M53 (A) terminal 10 and M54 (B) terminal 17 and ground.
7. Connect EPS control unit harness connector.
OK or NG
OK >> GO TO 3.
NG >> Check the following. If any items are damaged, repair
or replace damaged parts.
 60 A fusible link (letter m , located in the fuse and fusible link box).
 10 A fuse [No. 2, located in the fuse block (J/B)].
 Harness for short or open between battery and EPS control unit harness connector M54 termi-
nal 17.
 Harness for short or open between ignition switch and EPS control unit harness connector M53
terminal 10.
3.CHECK EPS CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect EPS control unit harness connector.
Connector Terminal Voltage
(A) M53 10 – Ground Battery voltage
(B) M54 17 – Ground Battery voltage
AWGIA0031ZZ
Connector Terminal Voltage
(A) M53 10 – Ground Approx. 0 V
(B) M54 17 – Ground Battery voltage
AWGIA0028ZZ

STC-32
< SYMPTOM DIAGNOSIS >[EPS]
EPS WARNING LAMP DOES NOT TURN OFF
3. Check continuity between EPS control unit harness connector
M54 terminal 18 and ground.
Also check harness for short to power.
4. Connect EPS control unit harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
4.CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-22, "
EPS Control Unit Input/Output Signal Reference
Va l u e".
OK or NG
OK >> GO TO 5.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.
5.SYMPTOM CHECK
Check again.
OK or NG
OK >>INSPECTION END
NG >> Replace combination meter. Refer to MWI-94, "
Removal and Installation".
Connector Terminal Continuity
M54 18 YES
AWGIA0029ZZ

STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT
STC-33
< SYMPTOM DIAGNOSIS >[EPS]
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STEERING WHEEL TURNING FORCE IS HEAVY OR LIGHT
Diagnosis ProcedureINFOID:0000000001697735
SYMPTOM:
Steering wheel turning force is heavy or light, while driving.
DIAGNOSTIC PROCEDURE
1.CHECK SYSTEM FOR CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to STC-7, "
CONSULT-III Function (EPS)".
Is the
“CAN COMM CIRCUIT [U1000]” displayed?
YES >> Perform trouble diagnosis for CAN communication line. Refer to STC-21, "Diagnosis Procedure".
NO >> GO TO 2.
2.CHECK VEHICLE SPEED SIGNAL
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to BRC-25, "
CONSULT-III
Function (ABS)" (with ABS) or BRC-105, "CONSULT-III Function (ABS)" (with ESP).
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 3.
3.CHECK COMBINATION METER SIGNAL
Perform self-diagnosis with combination meter. Refer to MWI-22, "
CONSULT-III Function (METER/M&A)".
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 4.
4.CHECK ENGINE STATUS SIGNAL
Perform self-diagnosis for ECM. Refer to EC-107, "
CONSULT-III Function" (HR16DE with EURO-OBD), EC-
462, "CONSULT-III Function" (HR16DE without EURO-OBD), EC-772, "CONSULT-III Function" (MR18DE),
EC-1104, "
Diagnosis Description" (K9K).
Is any malfunction detected by self-diagnosis?
YES >> Check the malfunctioning system.
NO >> GO TO 5.
5.CHECK EPS MOTOR SYSTEM
Perform trouble diagnosis for EPS motor. Refer to STC-13, "
Diagnosis Procedure".
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.
6.CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-22, "
EPS Control Unit Input/Output Signal Reference
Va l u e".
OK or NG
OK >> GO TO 7.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.
7.SYMPTOM CHECK
Check again.
OK or NG
OK >>INSPECTION END
NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to
ST-6, "
On-Vehicle Inspection and Service".

STC-34
< SYMPTOM DIAGNOSIS >[EPS]
UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BETWEEN
RIGHT AND LEFT
UNBALANCE STEERING WHEEL TURNING FORCE AND RETURN BE-
TWEEN RIGHT AND LEFT
Diagnosis ProcedureINFOID:0000000001697736
SYMPTOM:
Unbalance steering wheel turning force and return between right and left, while driving.
DIAGNOSTIC PROCEDURE
1.CHECK EPS WARNING LAMP
Confirm EPS warning lamp during engine running.
Does EPS warning lamp turn OFF?
YES >> GO TO 2.
NO >> Go to STC-31, "
Diagnosis Procedure".
2.CHECK WHEEL ALIGNMENT
Check wheel alignment. Refer to FSU-6, "
Wheel Alignment Inspection".
OK or NG
OK >> GO TO 3.
NG >> Adjust wheel alignment. Refer to FSU-6, "
Wheel Alignment Inspection".
3.CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-22, "
EPS Control Unit Input/Output Signal Reference
Va l u e".
OK or NG
OK >> GO TO 4.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.
4.SYMPTOM CHECK
Check again.
OK or NG
OK >>INSPECTION END
NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to
ST-6, "
On-Vehicle Inspection and Service".

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)
STC-35
< SYMPTOM DIAGNOSIS >[EPS]
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UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)
Diagnosis ProcedureINFOID:0000000001697737
SYMPTOM:
Unbalance steering wheel turning force, while driving (Torque variation).
DIAGNOSTIC PROCEDURE
1.CHECK EPS WARNING LAMP
Confirm EPS warning lamp during engine running.
Does EPS warning lamp turn OFF?
YES >> GO TO 2.
NO >> Go to STC-31, "
Diagnosis Procedure".
2.CHECK STEERING COLUMN INTERMEDIATE SHAFT
Check the connection between intermediate shaft and the mounting part of steering column assembly and
steering gear assembly. Refer to ST-9, "
Removal and Installation".
OK or NG
OK >> GO TO 3.
NG >> Repair or replace damaged parts.
3.CHECK EPS CONTROL UNIT
Check EPS control unit input/output signal. Refer to STC-22, "
EPS Control Unit Input/Output Signal Reference
Va l u e".
OK or NG
OK >> GO TO 4.
NG >> Check EPS control unit pin terminals for damage or loose connection with harness connector. If
any items are damaged, repair or replace damaged parts.
4.SYMPTOM CHECK
Check again.
OK or NG
OK >>INSPECTION END
NG >> Check the steering wheel turning force because there may be mechanical malfunction. Refer to
ST-6, "
On-Vehicle Inspection and Service".

STC-36
< PRECAUTION >[EPS]
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000001697712
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. Information necessary to service the system safely is included in the SR and SB section of
this Service Manual.
WARNING:
 To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
 Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
 Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000001716731
NOTE:
 This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
 Remove and install all control units after disconnecting both battery cables with the ignition knob in the
″LOCK″ position.
 Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. When the repair work is completed, return the ignition switch to the ″LOCK″ position before connecting
the battery cables. (At this time, the steering lock mechanism will engage.)
6. Perform a self-diagnosis check of all control units using CONSULT-III.
Service Notice or Precaution for EPS SystemINFOID:0000000001697713
CAUTION:
Check or confirm the following item when performing the trouble diagnosis.
 Check any possible causes by interviewing the symptom and it’s condition from the customer if any
malfunction, such as EPS warning lamp turns ON, occurs.
 Check if air pressure and size of tires are proper, the specified part is used for the steering wheel,
and control unit is genuine part.