Engine control system NISSAN TIIDA 2007 Service Manual PDF
[x] Cancel search | Manufacturer: NISSAN, Model Year: 2007, Model line: TIIDA, Model: NISSAN TIIDA 2007Pages: 2896, PDF Size: 64.73 MB
Page 1054 of 2896
DTC P1726 ELECTRIC THROTTLE CONTROL SYSTEM
CVT-157
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CVT
Revision: June 20062007 Versa
Diagnostic ProcedureUCS00634
1. CHECK DTC WITH ECM
With CONSULT-II
1. Turn ignition switch ON. (Do not start engine.)
2. Select “SELF-DIAG RESULTS” mode for “ENGINE” with CON-
SULT-II. Refer to EC-116, "
SELF-DIAG RESULTS MODE" .
OK or NG
OK >> GO TO 2.
NG >> Check the DTC Detected Item. Refer to EC-116, "
SELF-
DIAG RESULTS MODE" .
If CAN communication line is detected, go to CVT-68,
"DTC U1000 CAN COMMUNICATION LINE" .
2. CHECK DTC
Perform CVT-156, "
DTC Confirmation Procedure" .
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
3. DETECT MALFUNCTIONING ITEM
Check the following:
The TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> Replace TCM. Refer to CVT-9, "Service After Replacing TCM and Transaxle Assembly" .
NG >> Repair or replace damaged parts.
BCIA0030E
Page 1065 of 2896
CVT-168
DTC P1778 STEP MOTOR - FUNCTION
Revision: June 20062007 Versa
DTC P1778 STEP MOTOR - FUNCTIONPFP:31947
DescriptionUCS0063Q
The step motor is included in the control valve assembly.
The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of
line pressure to primary pulley is changed and pulley ratio is controlled.
This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
This diagnosis item is detected when the state of the changing the speed mechanism in unit does not
operate normally.
CONSULT-II Reference ValueUCS0063R
Remarks: Specification data are reference values.
On Board Diagnosis LogicUCS0063S
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P1778 STEP MOTR/FNC” with CONSULT-II is detected under the following con-
ditions.
–When not changing the pulley ratio according to the instruction of TCM.
Possible CauseUCS0063T
Step mot or
DTC Confirmation ProcedureUCS0063U
CAUTION:
Always drive vehicle at a safe speed.
Before starting “DTC Confirmation Procedure”, confirm “Hi” or “Mid” or “Low” fixation by “PRI
SPEED” and “VEHICLE SPEED” on “DATA MONITOR MODE”.
If hi-geared fixation occurred, go to CVT-169, "Diagnostic Procedure" .
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
2. Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the voltage
(cool down the fluid)
3. Select “DATA MONITOR” mode for “TRANSMISSION” with
CONSULT-II.
4. Start engine and maintain the following conditions for at least 30
consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
5. If DTC is detected, go to CVT-169, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
STM STEP
During driving−20 step - 180 step
GEAR RATIO2.56 - 0.43
BCIA0031E
Page 1093 of 2896
CVT-196
SHIFT CONTROL SYSTEM
Revision: June 20062007 Versa
Checking of CVT PositionUCS0064K
1. Place selector lever in “P” position, and turn ignition switch ON. (Do not start engine.)
2. Make sure selector lever can be shifted to other than “P” position when brake pedal is depressed. Also
make sure selector lever can be shifted from “P” position only when brake pedal is depressed.
3. Move the selector lever and check for excessive effort, sticking, noise or rattle.
4. Confirm the selector lever stops at each position with the feel of engagement when it is moved through all
the positions. Check that the actual position of the selector lever matches the position shown by the shift
position indicator and the manual lever on the transaxle.
5. The method of operating the selector lever to individual posi-
tions correctly should be as shown.
(A): Press selector button to operate selector lever, while
depressing the brake pedal.
(B): Press selector button to operate selector lever.
(C): Selector lever can be operated without pressing selector
button.
6. Confirm the back-up lamps illuminate only when selector lever is
placed in the “R” position. Confirm the back-up lamps do not illu-
minate when the selector lever is pushed toward the “R” position
side with the gear position remained in the “P” or “N” position.
7. Confirm the engine can only be started with the selector lever in the “P” and “N” positions.
8. Make sure transaxle is locked completely in “P” position.
WCIA0620E
Page 1096 of 2896
CVT SHIFT LOCK SYSTEM
CVT-199
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CVT
Revision: June 20062007 Versa
Diagnostic ProcedureUCS006KN
SYMPTOM 1:
Selector lever cannot be moved from “P” position with ignition switch in ON position and brake
pedal depressed.
Selector lever can be moved from “P” position with ignition key in ON position and brake pedal
released.
Selector lever can be moved from “P” position when ignition switch is removed from key cylinder.
SYMPTOM 2:
Ignition key cannot be removed when selector lever is set to “P” position.
Ignition key can be removed when selector lever is set to any position except “P” position.
1. CHECK KEY INTERLOCK CABLE
Check key interlock cable for damage.
OK or NG
OK >> GO TO 2.
NG >> Repair key interlock cable. Refer to AT-239, "
Removal and Installation" .
2. CHECK CVT POSITION
Check CVT position. Refer to CVT-196, "
Checking of CVT Position" .
OK or NG
OK >> GO TO 3.
NG >> Adjust control cable. Refer to CVT-195, "
Adjustment of CVT Position" .
3. CHECK SHIFT LOCK SOLENOID AND PARK POSITION SWITCH
1. Turn ignition switch ON. (Do not start engine.)
2. Selector lever is set in “P” position.
3. Check operation sound.
OK or NG
OK >>INSPECTION END
NG - 1 >> With intelligent key: GO TO 4.
NG - 2 >> Without intelligent key: GO TO 5.
4. CHECK POWER SOURCE
1. Turn ignition switch ON. (Do not start engine.)
2. Check voltage between CVT device harness connector terminal
5 and ground.
OK or NG
OK >> GO TO 8.
NG >> GO TO 6.
Condition Brake pedal Operation sound
When ignition switch is turned to ON position and selector lever is set in
“P” position.Depressed Yes
Released No
Voltage:
Brake pedal depressed: Battery voltage
Brake pedal released: 0V
SCIA7934E
Page 1110 of 2896
DI-1
DRIVER INFORMATION SYSTEM
K ELECTRICAL
CONTENTS
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SECTION DI
A
B
DI
Revision: June 20062007 Versa PRECAUTION ............................................................ 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
PREPARATION ........................................................... 4
Commercial Service Tool ......................................... 4
COMBINATION METERS ........................................... 5
Component Parts and Harness Connector Location ..... 5
System Description .................................................. 5
UNIFIED METER CONTROL UNIT ...................... 5
POWER SUPPLY AND GROUND CIRCUIT ........ 5
SPEEDOMETER ................................................... 6
TACHOMETER ..................................................... 6
FUEL GAUGE ....................................................... 6
ODO/TRIP METER ............................................... 6
CAN COMMUNICATION SYSTEM DESCRIP-
TION ...................................................................... 6
Arrangement of Combination Meter ......................... 7
Internal Circuit .......................................................... 8
Wiring Diagram — METER — .................................. 9
Combination Meter Harness Connector Terminal
Layout .....................................................................11
Terminals and Reference Value for Combination
Meter .......................................................................11
Self-Diagnosis Mode of Combination Meter ........... 13
SELF-DIAGNOSIS MODE FUNCTION ............... 13
OPERATION PROCEDURE ............................... 13
CONSULT-II Function (METER) ............................. 14
CONSULT-II START PROCEDURE .................... 14
SELF-DIAGNOSTIC RESULTS .......................... 14
DATA MONITOR ................................................. 15
Trouble Diagnosis .................................................. 17
HOW TO PERFORM TROUBLE DIAGNOSIS ... 17
PRELIMINARY CHECK ...................................... 17
Symptom Chart ...................................................... 17
Power Supply and Ground Circuit Inspection ........ 17
Vehicle Speed Signal Inspection ............................ 18
WITH ABS ........................................................... 18
WITHOUT ABS OR CVT ..................................... 19
WITH CVT, WITHOUT ABS ................................ 19Engine Speed Signal Inspection ............................. 20
Fuel Level Sensor Signal Inspection ...................... 20
Fuel Gauge Fluctuates, Indicates Wrong Value, or
Varies ...................................................................... 22
Fuel Gauge Does Not Move to Full position ........... 22
DTC [U1000] CAN Communication Circuit ............. 22
Electrical Components Inspection .......................... 23
FUEL LEVEL SENSOR UNIT CHECK ................ 23
Removal and Installation ........................................ 23
COMBINATION METER ...................................... 23
WARNING LAMPS .................................................... 24
Schematic ............................................................... 24
Wiring Diagram — WARN — .................................. 25
Oil Pressure Warning Lamp Stays Off (Ignition
Switch ON) ............................................................. 34
Oil Pressure Warning Lamp Does Not Turn Off (Oil
Pressure Is Normal) ................................................ 35
Component Inspection ............................................ 36
OIL PRESSURE SWITCH ................................... 36
A/T INDICATOR ........................................................ 37
System Description ................................................. 37
Wiring Diagram — AT/IND — ................................. 38
A/T Indicator Does Not Illuminate ........................... 40
CVT INDICATOR ....................................................... 42
System Description ................................................. 42
Wiring Diagram — CVTIND — ............................... 43
CVT Indicator Does Not Illuminate ......................... 45
WARNING CHIME ..................................................... 47
Component Parts and Harness Connector Location ... 47
System Description ................................................. 47
POWER SUPPLY AND GROUND CIRCUIT ....... 47
IGNITION KEY WARNING CHIME (WITHOUT
INTELLIGENT KEY) ............................................ 48
IGNITION KEY WARNING CHIME (WITH INTEL-
LIGENT KEY) ...................................................... 48
LIGHT WARNING CHIME ................................... 48
Wiring Diagram — CHIME — ................................. 50
Terminals and Reference Values for BCM .............. 52
CONSULT-II Function (BCM) ................................. 52
CONSULT-II START PROCEDURE .................... 52
Page 1115 of 2896
DI-6
COMBINATION METERS
Revision: June 20062007 Versa
through grounds M57 and M61.
SPEEDOMETER
With ABS
The ABS actuator and electric unit (control unit) provides a vehicle speed signal to the combination meter via
CAN communication lines.
Without ABS or CVT
The vehicle speed sensor provides a vehicle speed signal to the combination meter for speedometer indica-
tion.
With CVT, Without ABS
The TCM provides a vehicle speed signal to the combination meter via CAN communication lines.
TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm). The ECM provides an engine speed
signal to combination meter via CAN communication lines.
FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by the unified meter control unit and a variable resistor signal supplied
to combination meter terminal 24
through fuel level sensor unit and fuel pump terminal 5
through fuel level sensor unit and fuel pump terminal 2
from combination meter terminal 6.
ODO/TRIP METER
The vehicle speed signal and the memory signals from the meter memory circuit are processed by the combi-
nation meter and the mileage is displayed.
How to Change the Display
Refer to Owner's Manual for odo/trip meter operating instructions.
CAN COMMUNICATION SYSTEM DESCRIPTION
Refer to LAN-4, "SYSTEM DESCRIPTION" .
WKIA5370E
SKIB6904E
Page 1170 of 2896
EC-1
ENGINE CONTROL SYSTEM
B ENGINE
CONTENTS
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SECTION EC
A
EC
Revision: June 20062007 Versa INDEX FOR DTC ........................................................ 8
DTC No. Index ......................................................... 8
Alphabetical Index .................................................. 12
PRECAUTIONS ........................................................ 16
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ................................................................ 16
Precautions for Procedures without Cowl Top Cover ... 16
On Board Diagnostic (OBD) System of Engine and
A/T, CVT ................................................................. 16
Precaution .............................................................. 17
PREPARATION ......................................................... 20
Special Service Tools ............................................. 20
Commercial Service Tools ...................................... 21
ENGINE CONTROL SYSTEM .................................. 22
System Diagram ..................................................... 22
Multiport Fuel Injection (MFI) System .................... 23
Electronic Ignition (EI) System ............................... 25
Fuel Cut Control (at No Load and High Engine
Speed) .................................................................... 26
AIR CONDITIONING CUT CONTROL ..................... 27
Input/Output Signal Chart ....................................... 27
System Description ................................................ 27
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ... 28
System Description ................................................ 28
Component Description .......................................... 29
CAN COMMUNICATION .......................................... 30
System Description ................................................ 30
EVAPORATIVE EMISSION SYSTEM ....................... 31
Description ............................................................. 31
Component Inspection ........................................... 34
Removal and Installation ........................................ 35
How to Detect Fuel Vapor Leakage ....................... 35
ON BOARD REFUELING VAPOR RECOVERY
(ORVR) ...................................................................... 38
System Description ................................................ 38
Diagnostic Procedure ............................................. 39
Component Inspection ........................................... 42
POSITIVE CRANKCASE VENTILATION ................. 44Description .............................................................. 44
Component Inspection ............................................ 44
NVIS (NISSAN VEHICLE IMMOBILIZER SYSTEM-
NATS) ........................................................................ 46
Description .............................................................. 46
ON BOARD DIAGNOSTIC (OBD) SYSTEM ............ 47
Introduction ............................................................. 47
Two Trip Detection Logic ........................................ 47
Emission-related Diagnostic Information ................ 48
Malfunction Indicator Lamp (MIL) ........................... 61
OBD System Operation Chart ................................ 65
BASIC SERVICE PROCEDURE ............................... 70
Basic Inspection ..................................................... 70
Idle Speed and Ignition Timing Check .................... 75
Procedure After Replacing ECM ............................ 77
VIN Registration ..................................................... 77
Accelerator Pedal Released Position Learning ...... 77
Throttle Valve Closed Position Learning ................. 78
Idle Air Volume Learning ........................................ 78
Fuel Pressure Check .............................................. 81
TROUBLE DIAGNOSIS ............................................ 83
Trouble Diagnosis Introduction ............................... 83
DTC Inspection Priority Chart ................................. 89
Fail-Safe Chart ....................................................... 91
Symptom Matrix Chart ............................................ 92
Engine Control Component Parts Location ............ 96
Vacuum Hose Drawing .........................................102
Circuit Diagram .....................................................103
ECM Harness Connector Terminal Layout ...........105
ECM Terminals and Reference Value ...................105
CONSULT-II Function (ENGINE) ..........................113
Generic Scan Tool (GST) Function .......................126
CONSULT-II Reference Value in Data Monitor .....128
Major Sensor Reference Graph in Data Monitor
Mode .....................................................................131
TROUBLE DIAGNOSIS - SPECIFICATION VALUE .133
Description ............................................................133
Testing Condition ..................................................133
Inspection Procedure ............................................133
Diagnostic Procedure ...........................................134
Page 1174 of 2896
EC-5
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ECA
Revision: June 20062007 Versa DTC Confirmation Procedure ............................... 399
Diagnostic Procedure ........................................... 400
DTC P0456 EVAP CONTROL SYSTEM ................ 406
On Board Diagnosis Logic ................................... 406
DTC Confirmation Procedure ............................... 407
Overall Function Check ........................................ 408
Diagnostic Procedure ........................................... 409
DTC P0460 FUEL LEVEL SENSOR ...................... 415
Component Description ........................................ 415
On Board Diagnostic Logic .................................. 415
DTC Confirmation Procedure ............................... 415
Diagnostic Procedure ........................................... 416
Removal and Installation ...................................... 416
DTC P0461 FUEL LEVEL SENSOR ...................... 417
Component Description ........................................ 417
On Board Diagnostic Logic .................................. 417
Overall Function Check ........................................ 417
Diagnostic Procedure ........................................... 418
Removal and Installation ...................................... 418
DTC P0462, P0463 FUEL LEVEL SENSOR .......... 419
Component Description ........................................ 419
On Board Diagnostic Logic .................................. 419
DTC Confirmation Procedure ............................... 419
Diagnostic Procedure ........................................... 420
Removal and Installation ...................................... 420
DTC P0500 VSS ..................................................... 421
Description ........................................................... 421
On Board Diagnosis Logic ................................... 421
DTC Confirmation Procedure ............................... 421
Overall Function Check ........................................ 422
Diagnostic Procedure ........................................... 422
DTC P0506 ISC SYSTEM ....................................... 423
Description ........................................................... 423
On Board Diagnosis Logic ................................... 423
DTC Confirmation Procedure ............................... 423
Diagnostic Procedure ........................................... 424
DTC P0507 ISC SYSTEM ....................................... 425
Description ........................................................... 425
On Board Diagnosis Logic ................................... 425
DTC Confirmation Procedure ............................... 425
Diagnostic Procedure ........................................... 426
DTC P0605 ECM .................................................... 427
Component Description ........................................ 427
On Board Diagnosis Logic ................................... 427
DTC Confirmation Procedure ............................... 427
Diagnostic Procedure ........................................... 428
DTC P0643 SENSOR POWER SUPPLY ................ 430
On Board Diagnosis Logic ................................... 430
DTC Confirmation Procedure ............................... 430
Wiring Diagram .................................................... 431
Diagnostic Procedure ........................................... 433
DTC P0850 PNP SWITCH ...................................... 436
Component Description ........................................ 436
CONSULT-II Reference Value in Data Monitor Mode
. 436
On Board Diagnosis Logic ................................... 436
DTC Confirmation Procedure ............................... 436
Overall Function Check ........................................ 437Wiring Diagram .....................................................438
Diagnostic Procedure ...........................................439
DTC P1148 CLOSED LOOP CONTROL ................442
On Board Diagnosis Logic ....................................442
DTC P1217 ENGINE OVER TEMPERATURE ........443
System Description ...............................................443
CONSULT-II Reference Value in Data Monitor Mode
.444
On Board Diagnosis Logic ....................................445
Overall Function Check ........................................445
Wiring Diagram .....................................................448
Diagnostic Procedure ...........................................450
Main 13 Causes of Overheating ...........................458
Component Inspection ..........................................459
DTC P1225 TP SENSOR ........................................460
Component Description ........................................460
On Board Diagnosis Logic ....................................460
DTC Confirmation Procedure ...............................460
Diagnostic Procedure ...........................................461
Removal and Installation ......................................461
DTC P1226 TP SENSOR ........................................462
Component Description ........................................462
On Board Diagnosis Logic ....................................462
DTC Confirmation Procedure ...............................462
Diagnostic Procedure ...........................................463
Removal and Installation ......................................463
DTC P1421 COLD START CONTROL ...................464
Description ............................................................464
On Board Diagnosis Logic ....................................464
DTC Confirmation Procedure ...............................464
Diagnostic Procedure ...........................................464
DTC P1564 ASCD STEERING SWITCH ................466
Component Description ........................................466
CONSULT-II Reference Value in Data Monitor Mode
.466
On Board Diagnosis Logic ....................................466
DTC Confirmation Procedure ...............................467
Wiring Diagram .....................................................468
Diagnostic Procedure ...........................................469
Component Inspection ..........................................472
DTC P1572 ASCD BRAKE SWITCH ......................473
Component Description ........................................473
CONSULT-II Reference Value in Data Monitor Mode
.473
On Board Diagnosis Logic ....................................473
DTC Confirmation Procedure ...............................474
Wiring Diagram .....................................................475
Diagnostic Procedure ...........................................476
Component Inspection ..........................................481
DTC P1574 ASCD VEHICLE SPEED SENSOR .....483
Component Description ........................................483
On Board Diagnosis Logic ....................................483
DTC Confirmation Procedure ...............................483
Diagnostic Procedure ...........................................484
DTC P1715 INPUT SPEED SENSOR (TURBINE
REVOLUTION SENSOR) ........................................485
Description ............................................................485
CONSULT-II Reference Value in Data Monitor Mode
.485
Page 1178 of 2896
INDEX FOR DTC
EC-9
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EC
Revision: June 20062007 VersaP0222 0222 TP SEN 1/CIRCEC-302
P0223 0223 TP SEN 1/CIRCEC-302
P0300 0300 MULTI CYL MISFIREEC-308
P0301 0301 CYL 1 MISFIREEC-308
P0302 0302 CYL 2 MISFIREEC-308
P0303 0303 CYL 3 MISFIREEC-308
P0304 0304 CYL 4 MISFIREEC-308
P0327 0327 KNOCK SEN/CIRC-B1EC-315
P0328 0328 KNOCK SEN/CIRC-B1EC-315
P0335 0335 CKP SEN/CIRCUITEC-319
P0340 0340 CMP SEN/CIRC-B1EC-327
P0420 0420 TW CATALYST SYS-B1EC-334
P0441 0441 EVAP PURG FLOW/MONEC-340
P0442 0442 EVAP SMALL LEAKEC-346
P0443 0443 PURG VOLUME CONT/VEC-354
P0444 0444 PURG VOLUME CONT/VEC-362
P0445 0445 PURG VOLUME CONT/VEC-362
P0447 0447 VENT CONTROL VALVEEC-369
P0448 0448 VENT CONTROL VALVEEC-376
P0451 0451 EVAP SYS PRES SENEC-382
P0452 0452 EVAP SYS PRES SENEC-385
P0453 0453 EVAP SYS PRES SENEC-391
P0455 0455 EVAP GROSS LEAKEC-398
P0456 0456 EVAP VERY SML LEAKEC-406
P0460 0460 FUEL LEV SEN SLOSHEC-415
P0461 0461 FUEL LEVEL SENSOREC-417
P0462 0462 FUEL LEVL SEN/CIRCEC-419
P0463 0463 FUEL LEVL SEN/CIRCEC-419
P0500 0500
VEH SPEED SEN/CIRC*5EC-421
P0506 0506 ISC SYSTEMEC-423
P0507 0507 ISC SYSTEMEC-425
P0605 0605 ECMEC-427
P0643 0643 SENSOR POWER/CIRCEC-430
P0705 0705 PNP SW/CIRCAT- 9 7 (A/T),
CVT-78
(CVT)
P0710 0710 ATF TEMP SEN/CIRCAT- 1 0 2
(A/T),
CVT-85
(CVT)
P0715 0715 INPUT SPD SEN/CIRCCVT-90
P0720 0720
VEH SPD SEN/CIR AT*5AT- 1 0 7 (A/T),
CVT-95
(CVT)
P0725 0725 ENGINE SPEED SIGAT- 11 3
P0731 0731 A/T 1ST GR FNCTNAT- 11 7
P0732 0732 A/T 2ND GR FNCTNAT- 1 2 1
DTC*1
Items
(CONSULT-II screen terms)Reference page
CONSULT-II
GST*
2ECM*3
Page 1185 of 2896
EC-16Revision: June 2006
PRECAUTIONS
2007 Versa
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
UBS00QB3
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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WAR NIN G:
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 per-
formed by an authorized NISSAN/INFINITI dealer.
Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS 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
harness connectors.
Precautions for Procedures without Cowl Top CoverUBS00RCH
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
On Board Diagnostic (OBD) System of Engine and A/T, CVTUBS00QB4
The ECM has an on board diagnostic system. It will light up the malfunction indicator lamp (MIL) to warn the
driver of a malfunction causing emission deterioration.
CAUTION:
Be sure to turn the ignition switch OFF and disconnect the battery ground cable before any repair
or inspection work. The open/short circuit of related switches, sensors, solenoid valves, etc. will
cause the MIL to light up.
Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MIL to light up due to the open circuit. (Be sure the connector is free from water, grease,
dirt, bent terminals, etc.)
Certain systems and components, especially those related to OBD, may use a new style slide-
locking type harness connector. For description and how to disconnect, refer to PG-68, "
HAR-
NESS CONNECTOR" .
Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MIL to light up due to the short circuit.
Be sure to connect rubber tubes properly after work. A misconnected or disconnected rubber tube
may cause the MIL to light up due to the malfunction of the fuel injection system, etc.
Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM and
TCM (Transmission control module) before returning the vehicle to the customer.
PIIB3706J