2008 NISSAN LATIO service indicator

DI-38
< SERVICE INFORMATION >
CVT INDICATOR
CVT INDICATOR
System DescriptionINFOID:0000000001704518
The TCM receives CVT indicator signals from the CVT unit. The TCM then sends CVT position indicator sig-
nals to the combination meter via CAN communication lines. The combination meter indicates the received
shift position.
Wiring Diagram - CVTIND -INFOID:0000000001704519
LKWA0362E

CVT INDICATOR
DI-39
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
L
MA
B
DI
N
O
P
CVT Indicator Does Not IlluminateINFOID:0000000001704520
1.CHECK SEGMENT OF CVT INDICATOR
LKWA0363E

DI-40
< SERVICE INFORMATION >
CVT INDICATOR
Perform self-diagnosis of combination meter. Refer to DI-11, "Self-
Diagnosis Mode of Combination Meter".
Are all segments displayed?
YES >> GO TO 2.
NO >> Replace combination meter. Refer to IP-11, "
Removal
and Installation".
2.CHECK COMBINATION METER (CONSULT-III)
1. Connect CONSULT-III.
2. Select “METER/M&A” on CONSULT-III, and perform self-diagnosis of combination meter. Refer to DI-13,
"CONSULT-III Function (METER/M&A)".
Self
-diagnostic results content
No malfunction detected>>GO TO 3.
Malfunction detected>> Check applicable parts, and repair or replace as necessary.
3.CHECK COMBINATION METER INPUT SIGNAL
Use “DATA MONITOR” of “METER/M&A” on CONSULT-III. Confirm each indication on the monitor when oper-
ating the CVT selector lever.
OK or NG
OK >> Replace combination meter. Refer to IP-11, "Removal and Installation".
NG >> GO TO 4.
4.CHECK SELF-DIAGNOSIS RESULTS OF TCM
Perform self-diagnosis of TCM. Refer to CVT-47, "
CONSULT-III Function (TRANSMISSION)".
OK or NG
OK >> Check TCM input/output signal. Repair or replace malfunctioning part, if necessary. Refer to CVT-
22, "Input/Output Signal of TCM".
NG >> Check applicable part, and repair or replace as necessary.
SKIB1206J
CONSULT-III dis-
playSwitch operation Operation status
P RANGE INDP range position ON
Except for P range position OFF
R RANGE INDR range position ON
Except for R range position OFF
N RANGE INDN range position ON
Except for N range position OFF
D RANGE INDD range position ON
Except for D range position OFF
L RANGE INDL range position ON
Except for L range position OFF

EC-1
ENGINE
C
D
E
F
G
H
I
J
K
L
M
SECTION EC
A
EC
N
O
P
CONTENTS
ENGINE CONTROL SYSTEM
SERVICE INFORMATION ............................9
INDEX FOR DTC .................................................9
DTC No. Index ..........................................................9
Alphabetical Index ...................................................12
PRECAUTIONS ..................................................16
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .................................................................
16
Precaution for Procedure without Cowl Top Cover ....16
On Board Diagnosis (OBD) System of Engine and
A/T, CVT .................................................................
16
Precaution ...............................................................17
PREPARATION ..................................................20
Special Service Tool ...............................................20
Commercial Service Tool ........................................21
ENGINE CONTROL SYSTEM ............................22
Schematic ...............................................................22
Multiport Fuel Injection (MFI) System .....................22
Electronic Ignition (EI) System ................................25
Fuel Cut Control (at No Load and High Engine
Speed) .....................................................................
25
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 ............................................33
Removal and Installation .........................................35
How to Detect Fuel Vapor Leakage .........................35
ON BOARD REFUELING VAPOR RECOV-
ERY (ORVR) ......................................................
38
System Description ..................................................38
Diagnosis Procedure ...............................................38
Component Inspection .............................................40
POSITIVE CRANKCASE VENTILATION .........43
Description ...............................................................43
Component Inspection .............................................43
NVIS (NISSAN VEHICLE IMMOBILIZER SYS-
TEM-NATS) .......................................................
45
Description ...............................................................45
ON BOARD DIAGNOSTIC (OBD) SYSTEM ....46
Introduction ..............................................................46
Two Trip Detection Logic .........................................46
Emission-related Diagnostic Information .................47
Malfunction Indicator Lamp (MIL) ............................60
OBD System Operation Chart .................................63
BASIC SERVICE PROCEDURE .......................69
Basic Inspection ......................................................69
Idle Speed and Ignition Timing Check .....................73
Procedure After Replacing ECM .............................75
VIN Registration ......................................................75
Accelerator Pedal Released Position Learning .......76
Throttle Valve Closed Position Learning .................76
Idle Air Volume Learning .........................................76
Fuel Pressure Check ...............................................78
TROUBLE DIAGNOSIS ....................................81
Trouble Diagnosis Introduction ................................81
DTC Inspection Priority Chart ..................................86
Fail-Safe Chart ........................................................87
Symptom Matrix Chart .............................................88
Engine Control Component Parts Location .............93
Vacuum Hose Drawing ............................................99
Circuit Diagram ......................................................100
ECM Harness Connector Terminal Layout ............102

EC-7
C
D
E
F
G
H
I
J
K
L
M
ECA
N
O
P
DTC P2119 ELECTRIC THROTTLE CON-
TROL ACTUATOR ...........................................
472
Component Description .........................................472
On Board Diagnosis Logic ....................................472
DTC Confirmation Procedure ................................472
Diagnosis Procedure .............................................473
DTC P2122, P2123 APP SENSOR ..................474
Component Description .........................................474
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
474
On Board Diagnosis Logic ....................................474
DTC Confirmation Procedure ................................474
Wiring Diagram .....................................................476
Diagnosis Procedure .............................................477
Component Inspection ..........................................479
Removal and Installation .......................................479
DTC P2127, P2128 APP SENSOR ..................480
Component Description .........................................480
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
480
On Board Diagnosis Logic ....................................480
DTC Confirmation Procedure ................................481
Wiring Diagram .....................................................482
Diagnosis Procedure .............................................483
Component Inspection ..........................................485
Removal and Installation .......................................486
DTC P2135 TP SENSOR .................................487
Component Description .........................................487
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
487
On Board Diagnosis Logic ....................................487
DTC Confirmation Procedure ................................487
Wiring Diagram .....................................................489
Diagnosis Procedure .............................................490
Component Inspection ..........................................492
Removal and Installation .......................................492
DTC P2138 APP SENSOR ...............................493
Component Description .........................................493
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
493
On Board Diagnosis Logic ....................................493
DTC Confirmation Procedure ................................494
Wiring Diagram .....................................................495
Diagnosis Procedure .............................................496
Component Inspection ..........................................499
Removal and Installation .......................................499
DTC P2A00 A/F SENSOR 1 .............................500
Component Description .........................................500
CONSULT-II Reference Value in Data Monitor
Mode .....................................................................
500
On Board Diagnosis Logic ....................................500
DTC Confirmation Procedure ................................500
Wiring Diagram .....................................................502
Diagnosis Procedure .............................................503
Removal and Installation .......................................507
ASCD BRAKE SWITCH ..................................508
Component Description .........................................508
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
508
Wiring Diagram ......................................................509
Diagnosis Procedure .............................................510
Component Inspection ...........................................514
ASCD INDICATOR ..........................................516
Component Description .........................................516
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
516
Wiring Diagram ......................................................517
Diagnosis Procedure .............................................517
ELECTRICAL LOAD SIGNAL ........................519
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
519
Diagnosis Procedure .............................................519
FUEL INJECTOR ............................................521
Component Description .........................................521
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
521
Wiring Diagram ......................................................522
Diagnosis Procedure .............................................523
Component Inspection ...........................................525
Removal and Installation .......................................525
FUEL PUMP ....................................................526
Description .............................................................526
CONSULT-II Reference Value in Data Monitor
Mode ......................................................................
526
Wiring Diagram ......................................................527
Diagnosis Procedure .............................................528
Component Inspection ...........................................530
Removal and Installation .......................................530
IGNITION SIGNAL ..........................................531
Component Description .........................................531
Wiring Diagram ......................................................532
Diagnosis Procedure .............................................535
Component Inspection ...........................................538
Removal and Installation .......................................540
REFRIGERANT PRESSURE SENSOR ..........541
Component Description .........................................541
Wiring Diagram ......................................................542
Diagnosis Procedure .............................................543
Removal and Installation .......................................545
MIL AND DATA LINK CONNECTOR .............546
Wiring Diagram ......................................................546
SERVICE DATA AND SPECIFICATIONS
(SDS) ...............................................................
548
Fuel Pressure ........................................................548
Idle Speed and Ignition Timing ..............................548
Calculated Load Value ..........................................548
Mass Air Flow Sensor ............................................548
Intake Air Temperature Sensor .............................548

EC-16
< SERVICE INFORMATION >
PRECAUTIONS
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000001702548
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.
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 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 har-
ness connectors.
Precaution for Procedure without Cowl Top CoverINFOID:0000000001702549
When performing the procedure after removing cowl top cover, cover
the lower end of windshield with urethane, etc.
On Board Diagnosis (OBD) System of Engine and A/T, CVTINFOID:0000000001702550
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-lock-
ing type harness connector. For description and how to disconnect, refer to PG-65
.
• 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

EC-28
< SERVICE INFORMATION >
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
AUTOMATIC SPEED CONTROL DEVICE (ASCD)
System DescriptionINFOID:0000000001702560
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
BASIC ASCD SYSTEM
Refer to Owner's Manual for ASCD operating instructions.
Automatic Speed Control Device (ASCD) allows a driver to keep vehicle at predetermined constant speed
without depressing accelerator pedal. Driver can set vehicle speed in advance between approximately 40 km/
h (25 MPH) and 144 km/h (89 MPH).
ECM controls throttle angle of electric throttle control actuator to regulate engine speed.
Operation status of ASCD is indicated by CRUISE indicator and SET indicator in combination meter. If any
malfunction occurs in ASCD system, it automatically deactivates control.
NOTE:
Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.
SET OPERATION
Press MAIN switch. (The CRUISE indicator in combination meter illuminates.)
When vehicle speed reaches a desired speed between approximately 40 km/h (25 MPH) and 144 km/h (89
MPH), press SET/COAST switch. (Then SET indicator in combination meter illuminates.)
ACCELERATE OPERATION
If the RESUME/ACCELERATE switch is depressed during cruise control driving, increase the vehicle speed
until the switch is released or vehicle speed reaches maximum speed controlled by the system.
And then ASCD will keep the new set speed.
CANCEL OPERATION
When any of following conditions exist, cruise operation will be canceled.
• CANCEL switch is pressed
• More than two switches at ASCD steering switch are pressed at the same time (Set speed will be cleared)
• Brake pedal is depressed
• Clutch pedal is depressed or gear position is changed to the neutral position (M/T models)
• Selector lever is changed to N, P, R position (A/T and CVT models)
• Vehicle speed decreased to 13 km/h (8 MPH) lower than the set speed
When the ECM detects any of the following conditions, the ECM will cancel the cruise operation and inform
the driver by blinking indicator lamp.
• Engine coolant temperature is slightly higher than the normal operating temperature, CRUISE lamp may
blink slowly.
When the engine coolant temperature decreases to the normal operating temperature, CRUISE lamp will
stop blinking and the cruise operation will be able to work by pressing SET/COAST switch or RESUME/
ACCELERATE switch.
• Malfunction for some self-diagnoses regarding ASCD control: SET lamp will blink quickly.
If MAIN switch is turned to OFF during ASCD is activated, all of ASCD operations will be canceled and vehicle
speed memory will be erased.
COAST OPERATION
When the SET/COAST switch is depressed during cruise control driving, decrease vehicle set speed until the
switch is released. And then ASCD will keep the new set speed.
Sensor Input signal to ECM ECM function Actuator
ASCD brake switch Brake pedal operation
ASCD vehicle speed controlElectric throttle control
actuator Stop lamp switch Brake pedal operation
ASCD clutch switch (M/T models) Clutch pedal operation
ASCD steering switch ASCD steering switch operation
Park/neutral position (PNP) switch Gear position
Combination meter Vehicle speed*
TCM (A/T and CVT models) Powertrain revolution*

AUTOMATIC SPEED CONTROL DEVICE (ASCD)
EC-29
< SERVICE INFORMATION >
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
RESUME OPERATION
When the RESUME/ACCELERATE switch is depressed after cancel operation other than depressing MAIN
switch is performed, vehicle speed will return to last set speed. To resume vehicle set speed, vehicle condition
must meet following conditions.
• Brake pedal is released.
• Clutch pedal is released (M/T models)
• Selector lever is in other than P and N positions (A/T and CVT models)
• Vehicle speed is greater than 40 km/h (25 MPH) and less than 144 km/h (89 MPH)
Component DescriptionINFOID:0000000001702561
ASCD STEERING SWITCH
Refer to EC-432.
ASCD BRAKE SWITCH
Refer to EC-438 and EC-508.
ASCD CLUTCH SWITCH
Refer to EC-438 and EC-508.
STOP LAMP SWITCH
Refer to EC-438, EC-452and EC-508.
ELECTRIC THROTTLE CONTROL ACTUATOR
Refer to EC-456, EC-461, EC-467and EC-472.
ASCD INDICATOR
Refer to EC-516.