ECU NISSAN TEANA 2008 Service Manual

STC-1
STEERING
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SECTION STC
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CONTENTS
STEERING CONTROL SYSTEM
BASIC INSPECTION ....... .............................2
DIAGNOSIS AND REPAIR WORK FLOW .... .....2
Work Flow ........................................................... ......2
FUNCTION DIAGNOSIS ...............................3
EPS SYSTEM ... .............................................. .....3
System Diagram .................................................. ......3
System Description ...................................................3
Component Parts Location ........................................5
Component Description .............................................5
COMPONENT DIAGNOSIS ..........................6
POWER SUPPLY AND GROUND CIRCUIT .. .....6
Description .......................................................... ......6
Diagnosis Procedure .................................................6
POWER STEERING SOLENOID VALVE ...........7
Description .......................................................... ......7
Diagnosis Procedure .................................................7
Component Inspection ..............................................8
ENGINE SPEED SIGNAL CIRCUIT ............... .....9
Description .......................................................... ......9
Diagnosis Procedure .................................................9
VEHICLE SPEED SIGNAL CIRCUIT .................11
Description .......................................................... ....11
Diagnosis Procedure ...............................................11
ECU DIAGNOSIS .........................................13
POWER STEERING CONTROL UNIT ..............13
Reference Value .................................................. ....13
Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - ............
14
Fail-Safe .............................................................. ....15
SYMPTOM DIAGNOSIS ..............................17
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) .......................
17
Description ........................................................... ....17
Diagnosis Procedure ...............................................17
PRECAUTION ..............................................18
PRECAUTIONS .................................................18
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
18
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect ...................................
18
ON-VEHICLE REPAIR .................................19
POWER STEERING CONTROL UNIT ..............19
Exploded View ..................................................... ....19
Removal and Installation .........................................19

POWER STEERING CONTROL UNIT
STC-13
< ECU DIAGNOSIS >
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ECU DIAGNOSIS
POWER STEERING CONTROL UNIT
Reference ValueINFOID:0000000003893535
TERMINAL LAYOUT
PHYSICAL VALUES
JSGIA0023ZZ
Te r m i n a l N o .
(Wire color)Description
Condition Value (Approx.)
+ - Signal nameInput/
Output
1
(R/Y)GroundPower steering solenoid
valve voltageOutputVehicle speed: 0 km/h (0 MPH)
(Engine is running)4.4 – 6.6 V
Vehicle speed: 100 km/h (62 MPH) 2.4 – 3.6 V
3
(G/W)GroundIgnition switch power
supplyInputIgnition switch: ON Battery voltage
Ignition switch: OFF 0 V
5
(LG)GroundPower steering solenoid
valve ground—Always 0 V
6
(B)Ground Ground — Always 0 V
8
(L/B)Ground Vehicle speed signal InputVehicle speed: 40 km/h (25 MPH)
CAUTION:
Check air pressure of tire under
standard condition.
10
(V/W)Ground Engine speed signal InputEngine is running
 Warm-up condition
 Idle speed
Engine is running
 Warm-up condition
 Engine speed: Approx. 2,000 rpm
JSNIA0015GB
JSGIA0143ZZ
PBIA3655J

STC-14
< ECU DIAGNOSIS >
POWER STEERING CONTROL UNIT
CAUTION:
When using circuit tester or oscilloscope to measure voltage for inspection, be sure not to forcibly extend any connector ter-
minals.
Wiring Diagram - ELECTRONICALLY CONTROLLED POWER STEERING SYSTEM -
INFOID:0000000003893536
JCGWM0089GB

POWER STEERING CONTROL UNIT
STC-15
< ECU DIAGNOSIS >
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Fail-SafeINFOID:0000000003893835
EPS system
JCGWM0090GB

STC-16
< ECU DIAGNOSIS >
POWER STEERING CONTROL UNIT
 EPS system enters the fail-safe mode (that allows the steering
force to be controlled without impairing the drivability) if any of the
input/output values to/from EPS system (power steering control
unit) deviate from the standard range.
NOTE:
The system enters the fail-safe mode if the engine speed remains
at 1,500 rpm or more for over 10 seconds while the vehicle is
stopped. This is normal.
 The fail-safe function is canceled when a vehicle speed signal of 2
km/h (1.2 MPH) or more is inputted or the ignition switch is turned
OFF→ON. EPS system restores the normal operation at that time.
JSGIA0426GB
ModeWarn-
ing lampDTC Detection point (malfunction part) Error area and root cause
Fail-safe
function— — Vehicle speed signal input Engine speed is 1,500 rpm or more and there is no vehicle
speed signal input for over 10 seconds during vehicle travel.
 Vehicle speed signal has abruptly dropped from 30 km/h (19
MPH) or more to 2 km/h (1.2 MPH) or less within 1.4 sec-
onds.

STARTER MOTOR
STR-19
< ON-VEHICLE REPAIR >
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Magnet is secured to yoke by bonding agent. Check magnet to see
that it is secured to yoke and for any cracks. Replace malfunctioning
parts as an assembly.
CAUTION:
Never clamp yoke in a vise or strike it with a hammer.
ARMATURE CHECK
1. Continuity test (between two segments side by side)
- Replace if continuity does not exist.
2. Insulation test (between each commutator bar and shaft)
- Replace if continuity exists.
3. Check commutator surface.
- Grind commutator with No. 500 – 600 emery paper if the surface
is rough.
4. Check diameter of commutator.
- Replace armature assembly if the measurement value is less
than the specified value.
SEL305H
SKIB0461E
SEL020Z
Commutator minimum di-
ameter: Refer to SDS STR-26,
"StarterMotor".
SEL021Z

STR-24
< ON-VEHICLE REPAIR >
STARTER MOTOR
Magnet is secured to yoke by bonding agent. Check magnet to see
that it is secured to yoke and for any cracks. Replace malfunctioning
parts as an assembly.
CAUTION:
Never clamp yoke in a vise or strike it with a hammer.
ARMATURE CHECK
1. Continuity test (between two segments side by side)
- Replace if continuity does not exist.
2. Insulation test (between each commutator bar and shaft)
- Replace if continuity exists.
3. Check commutator surface.
- Grind commutator with No. 500 – 600 emery paper if the surface
is rough.
4. Check diameter of commutator.
- Replace armature assembly if the measurement value is less
than the specified value.
SEL305H
SKIB0461E
SEL020Z
Commutator minimum di-
ameter: Refer to SDS STR-26,
"StarterMotor".
SEL021Z

TM-3
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P Component Inspection [Pressure Control Sole-
noid Valve B (Secondary Pressure Solenoid
Valve)] .....................................................................
84
P1701 TRANSMISSION CONTROL MODULE
(POWER SUPPLY) .............................................
85
Description ..............................................................85
DTC Logic ...............................................................85
Diagnosis Procedure ...............................................85
P1705 THROTTLE POSITION SENSOR ...........88
Description ..............................................................88
DTC Logic ...............................................................88
Diagnosis Procedure ...............................................88
P1722 ESTM VEHICLE SPEED SIGNAL ..........89
Description ..............................................................89
DTC Logic ...............................................................89
Diagnosis Procedure ...............................................89
P1723 CVT SPEED SENSOR FUNCTION ........91
Description ..............................................................91
DTC Logic ...............................................................91
Diagnosis Procedure ...............................................91
P1726 ELECTRIC THROTTLE CONTROL
SYSTEM .............................................................
93
Description ..............................................................93
DTC Logic ...............................................................93
Diagnosis Procedure ...............................................93
P1740 LOCK-UP SELECT SOLENOID
VALVE ................................................................
94
Description ..............................................................94
DTC Logic ...............................................................94
Diagnosis Procedure ...............................................94
Component Inspection (Lock-up Select Solenoid
Valve) ......................................................................
95
P1745 LINE PRESSURE CONTROL .................96
Description ..............................................................96
DTC Logic ...............................................................96
Diagnosis Procedure ...............................................96
P1777 STEP MOTOR .........................................97
Description ..............................................................97
DTC Logic ...............................................................97
Diagnosis Procedure ...............................................97
Component Inspection (Step Motor) .......................98
P1778 STEP MOTOR - FUNCTION .................100
Description ............................................................100
DTC Logic .............................................................100
Diagnosis Procedure .............................................100
SHIFT POSITION INDICATOR CIRCUIT .........102
Description ............................................................102
Component Function Check ..................................102
Diagnosis Procedure .............................................102
SHIFT LOCK SYSTEM .....................................103
Description .............................................................103
Wiring Diagram - CVT SHIFT LOCK SYSTEM - ...103
Component Function Check ..................................105
Diagnosis Procedure .............................................106
Component Inspection (Stop Lamp Switch) ..........107
SPORT MODE SWITCH .................................108
Description .............................................................108
Component Function Check ..................................108
Diagnosis Procedure .............................................108
ECU DIAGNOSIS .......................................111
TCM .................................................................111
Reference Value ....................................................111
Wiring Diagram - CVT CONTROL SYSTEM - .......116
Fail-safe .................................................................120
DTC Inspection Priority Chart ................................121
DTC Index .............................................................121
SYMPTOM DIAGNOSIS ............................123
SYSTEM SYMPTOM .......................................123
Symptom Table .....................................................123
PRECAUTION ............................................135
PRECAUTIONS ...............................................135
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...............................................................
135
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect .................................
135
Precaution for Procedure without Cowl Top Cover ..136
Precaution for On Board Diagnosis (OBD) System
of CVT and Engine ................................................
136
Precaution for TCM and CVT Assembly Replace-
ment .......................................................................
136
Removal and Installation Procedure for CVT Unit
Connector ..............................................................
136
Precaution .............................................................138
Service Notice or Precaution .................................138
ATFTEMP COUNT Conversion Table ...................139
PREPARATION .........................................140
PREPARATION ...............................................140
Special Service Tools ............................................140
Commercial Service Tools .....................................140
ON-VEHICLE MAINTENANCE ..................142
CVT FLUID ......................................................142
Inspection ..............................................................142
Changing ...............................................................143
STALL TEST ...................................................144
Inspection and Judgment ......................................144
LINE PRESSURE TEST ..................................146
Inspection and Judgment ......................................146

TM-6
P0778 PRESSURE CONTROL SOLENOID B
ELECTRICAL (SEC PRESSURE SOLENOID
VALVE) ............................................................
240
Description .............................................................240
DTC Logic ..............................................................240
Diagnosis Procedure .............................................240
Component Inspection [Pressure Control Sole-
noid Valve B (Secondary Pressure Solenoid
Valve)] ...................................................................
241
P0840 TRANSMISSION FLUID PRESSURE
SENSOR A (SEC PRESSURE SENSOR) .......
242
Description .............................................................242
DTC Logic ..............................................................242
Diagnosis Procedure .............................................242
P0841 PRESSURE SENSOR FUNCTION ......245
Description .............................................................245
DTC Logic ..............................................................245
Diagnosis Procedure .............................................245
Component Inspection [Pressure Control Sole-
noid Valve A (Line Pressure Solenoid Valve)] .......
246
Component Inspection [Pressure Control Sole-
noid Valve B (Secondary Pressure Solenoid
Valve)] ...................................................................
246
P0868 SECONDARY PRESSURE DOWN ......247
Description .............................................................247
DTC Logic ..............................................................247
Diagnosis Procedure .............................................247
Component Inspection [Pressure Control Sole-
noid Valve A (Line Pressure Solenoid Valve)] .......
248
Component Inspection [Pressure Control Sole-
noid Valve B (Secondary Pressure Solenoid
Valve)] ...................................................................
248
P1701 TRANSMISSION CONTROL MODULE
(POWER SUPPLY) ..........................................
249
Description .............................................................249
DTC Logic ..............................................................249
Diagnosis Procedure .............................................249
P1705 THROTTLE POSITION SENSOR ........252
Description .............................................................252
DTC Logic ..............................................................252
Diagnosis Procedure .............................................252
P1722 ESTM VEHICLE SPEED SIGNAL ........253
Description .............................................................253
DTC Logic ..............................................................253
Diagnosis Procedure .............................................253
P1723 CVT SPEED SENSOR FUNCTION ......255
Description .............................................................255
DTC Logic ..............................................................255
Diagnosis Procedure .............................................255
P1726 ELECTRIC THROTTLE CONTROL
SYSTEM ...........................................................
257
Description .............................................................257
DTC Logic .............................................................257
Diagnosis Procedure .............................................257
P1740 LOCK-UP SELECT SOLENOID
VALVE ..............................................................
258
Description ............................................................258
DTC Logic .............................................................258
Diagnosis Procedure .............................................258
Component Inspection (Lock-up Select Solenoid
Valve) ....................................................................
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P1745 LINE PRESSURE CONTROL ...............260
Description ............................................................260
DTC Logic .............................................................260
Diagnosis Procedure .............................................260
P1777 STEP MOTOR .......................................261
Description ............................................................261
DTC Logic .............................................................261
Diagnosis Procedure .............................................261
Component Inspection (Step Motor) .....................263
P1778 STEP MOTOR - FUNCTION .................264
Description ............................................................264
DTC Logic .............................................................264
Diagnosis Procedure .............................................264
SHIFT POSITION INDICATOR CIRCUIT .........266
Description ............................................................266
Component Function Check .................................266
Diagnosis Procedure .............................................266
SHIFT LOCK SYSTEM .....................................267
Description ............................................................267
Wiring Diagram - CVT SHIFT LOCK SYSTEM - ...267
Component Function Check .................................269
Diagnosis Procedure .............................................270
Component Inspection (Stop Lamp Switch) ..........271
SPORT MODE SWITCH ...................................272
Description ............................................................272
Component Function Check .................................272
Diagnosis Procedure .............................................272
ECU DIAGNOSIS ......................................275
TCM ..................................................................275
Reference Value ...................................................275
Wiring Diagram - CVT CONTROL SYSTEM - ......279
Fail-safe ................................................................283
DTC Inspection Priority Chart ...............................284
DTC Index .............................................................284
SYMPTOM DIAGNOSIS ...........................286
SYSTEM SYMPTOM ........................................286
Symptom Table .....................................................286
PRECAUTION ...........................................297
PRECAUTIONS ................................................297

SHIFT CONTROL SYSTEM
TM-31
< FUNCTION DIAGNOSIS >[CVT: RE0F09B]
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By limiting the gear range to the lowest position, the strong driving
force and the engine brake can be secured.
DOWNHILL ENGINE BRAKE CONTROL (AUTO ENGINE BRAKE CONTROL)
When a downhill slope is detected with the accelerator pedal released, the engine brake will be strengthened
up by downshifting so as not to accelerate the vehicle more than necessary.
ACCELERATION CONTROL
According to vehicle speed and a change of accelerator pedal angle, driver's request for acceleration and driv-
ing scene are judged. This function assists improvement in the acceleration feeling by making the engine
speed proportionate to the vehicle speed. And a shift map that can gain a larger driving force is available for
compatibility of mileage with driveability.
Component Parts LocationINFOID:0000000003848938
JPDIA0686GB
JPDIA0747ZZ