Almera Tino V10 (2003 year). Manual — part 96
INDEX FOR DTC
EC-555
[QG (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*3: When engine is running.
*4: The trouble shooting for this DTC needs CONSULT-II.
A/T MODELS
×
: Applicable —: Not applicable
SENSOR POWER/CIRC
P1229
1229
1
×
TP SEN 1/CIRC
P0222
0222
1
×
TP SEN 1/CIRC
P0223
0223
1
×
TP SEN 2/CIRC
P1223
1223
1
×
TP SEN 2/CIRC
P1224
1224
1
×
TP SENSOR
P0221
0221
1
×
Items
(CONSULT-II screen terms)
DTC
*1
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
Items
(CONSULT-II screen terms)
DTC
*1
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
APP SEN 1/CIRC
P0227
0227
1
×
APP SEN 1/CIRC
P0228
0228
1
×
APP SEN 2/CIRC
P1227
1227
1
×
APP SEN 2/CIRC
P1228
1228
1
×
APP SENSOR
P0226
0226
1
×
BRAKE SW/CIRCUIT
P1805
1805
1
×
CAN COMM CIRCUIT
U1000
1000
*4
2
—
CAN COMM CIRCUIT
U1001
1001
*4
2
—
CKP SEN/CIRCUIT
P0335
0335
2
×
CMP SEN/CIRC-B1
P0340
0340
2
×
CTP LEARNING
P1225
1225
2
—
CTP LEARNING
P1226
1226
2
—
ECM
P0605
0605
1 or 2
×
or —
ECM BACK UP/CIRC
P1065
1065
2
×
ECT SEN/CIRCUIT
P0117
0117
2
×
ECT SEN/CIRCUIT
P0118
0118
2
×
ENG OVER TEMP
P1217
1217
1
×
ETC ACTR
P1121
1121
1 or 2
×
ETC FUNCTION/CIRC
P1122
1122
1
×
ETC MOT
P1128
1128
1
×
ETC MOT PWR
P1124
1124
1
×
ETC MOT PWR
P1126
1126
1
×
HO2S1 (B1)
P0132
0132
2
×
HO2S1 (B1)
P0134
0134
2
×
HO2S1 (B2)
P0152
0152
2
×
HO2S1 (B2)
P0154
0154
2
×
HO2S2 (B1)
P0138
0138
2
×
HO2S2 (B2)
P0158
0158
2
×
KNOCK SEN/CIRC-B1
P0327
0327
2
—
EC-556
[QG (WITHOUT EURO-OBD)]
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*3: When engine is running.
*4: The trouble shooting for this DTC needs CONSULT-II.
NOTE:
Regarding V10 models with A/T, “B1” indicates bank 1 (cylinders number 1 and 4), “B2” indicates bank 2 (cylinders number 2 and 3).
DTC No. Index
EBS00QUG
Check if the vehicle is a model with Euro-OBD (E-OBD) system or not by the “Type approval number” on the
identification plate. Refer to “IDENTIFICATION PLATE”, GI-40.
NOTE:
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
EC-651, "DTC U1000, U1001 CAN COMMUNICATION LINE"
.
M/T MODELS
×
: Applicable —: Not applicable
KNOCK SEN/CIRC-B1
P0328
0328
2
—
MAF SEN/CIRCUIT
P0102
0102
1
×
MAF SEN/CIRCUIT
P0103
0103
1
×
NATS MALFUNCTION
P1610 -
P1615
1610 - 1615
2
—
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
No DTC
Flashing
*3
—
Flashing
*3
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
P0000
0000
—
—
—
SENSOR POWER/CIRC
P1229
1229
1
×
TP SEN 1/CIRC
P0222
0222
1
×
TP SEN 1/CIRC
P0223
0223
1
×
TP SEN 2/CIRC
P1223
1223
1
×
TP SEN 2/CIRC
P1224
1224
1
×
TP SENSOR
P0221
0221
1
×
Items
(CONSULT-II screen terms)
DTC
*1
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
DTC
*1
Items
(CONSULT-II screen terms)
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
No DTC
Flashing
*3
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
—
Flashing
*3
U1001
1001
*4
CAN COMM CIRCUIT
2
—
P0000
0000
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
—
—
—
P0102
0102
MAF SEN/CIRCUIT
1
×
P0103
0103
MAF SEN/CIRCUIT
1
×
P0117
0117
ECT SEN/CIRCUIT
2
×
P0118
0118
ECT SEN/CIRCUIT
2
×
P0132
0132
HO2S1 (B1)
2
×
P0134
0134
HO2S1 (B1)
2
×
P0138
0138
HO2S2 (B1)
2
×
INDEX FOR DTC
EC-557
[QG (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*3: When engine is running.
*4: The troubleshooting for this DTC needs CONSULT-II.
A/T MODELS
×
: Applicable —: Not applicable
P0221
0221
TP SENSOR
1
×
P0222
0222
TP SEN 1/CIRC
1
×
P0223
0223
TP SEN 1/CIRC
1
×
P0226
0226
APP SENSOR
1
×
P0227
0227
APP SEN 1/CIRC
1
×
P0228
0228
APP SEN 1/CIRC
1
×
P0327
0327
KNOCK SEN/CIRC-B1
2
—
P0328
0328
KNOCK SEN/CIRC-B1
2
—
P0335
0335
CKP SEN/CIRCUIT
2
×
P0340
0340
CMP SEN/CIRC-B1
2
×
P0605
0605
ECM
1 or 2
×
or —
P1065
1065
ECM BACK UP/CIRC
2
×
P1121
1121
ETC ACTR
1 or 2
×
P1122
1122
ETC FUNCTION/CIRC
1
×
P1124
1124
ETC MOT PWR
1
×
P1126
1126
ETC MOT PWR
1
×
P1128
1128
ETC MOT
1
×
P1217
1217
ENG OVER TEMP
1
×
P1223
1223
TP SEN 2/CIRC
1
×
P1224
1224
TP SEN 2/CIRC
1
×
P1225
1225
CTP LEARNING
2
—
P1226
1226
CTP LEARNING
2
—
P1227
1227
APP SEN 2/CIRC
1
×
P1228
1228
APP SEN 2/CIRC
1
×
P1229
1229
SENSOR POWER/CIRC
1
×
P1610 - P1615
1610 - 1615
NATS MALFUNCTION
2
—
P1805
1805
BRAKE SW/CIRCUIT
1
×
DTC
*1
Items
(CONSULT-II screen terms)
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
DTC
*1
Items
(CONSULT-II screen terms)
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
No DTC
Flashing
*3
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
—
Flashing
*3
U1000
1000
*4
CAN COMM CIRCUIT
2
—
U1001
1001
*4
CAN COMM CIRCUIT
2
—
P0000
0000
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
—
—
—
P0102
0102
MAF SEN/CIRCUIT
1
×
P0103
0103
MAF SEN/CIRCUIT
1
×
EC-558
[QG (WITHOUT EURO-OBD)]
INDEX FOR DTC
*1: 1st trip DTC No. is the same as DTC No.
*2: In Diagnostic Test Mode II (Self-diagnostic results), these numbers are controlled by NISSAN.
*3: When engine is running.
*4: The troubleshooting for this DTC needs CONSULT-II.
NOTE:
Regarding V10 models with A/T, “B1” indicates bank 1 (cylinders number 1 and 4), “B2” indicates bank 2 (cylinders number 2 and 3).
P0117
0117
ECT SEN/CIRCUIT
2
×
P0118
0118
ECT SEN/CIRCUIT
2
×
P0132
0132
HO2S1 (B1)
2
×
P0134
0134
HO2S1 (B1)
2
×
P0138
0138
HO2S2 (B1)
2
×
P0152
0152
HO2S1 (B2)
2
×
P0154
0154
HO2S1 (B2)
2
×
P0158
0158
HO2S2 (B2)
2
×
P0221
0221
TP SENSOR
1
×
P0222
0222
TP SEN 1/CIRC
1
×
P0223
0223
TP SEN 1/CIRC
1
×
P0226
0226
APP SENSOR
1
×
P0227
0227
APP SEN 1/CIRC
1
×
P0228
0228
APP SEN 1/CIRC
1
×
P0327
0327
KNOCK SEN/CIRC-B1
2
—
P0328
0328
KNOCK SEN/CIRC-B1
2
—
P0335
0335
CKP SEN/CIRCUIT
2
×
P0340
0340
CMP SEN/CIRC-B1
2
×
P0605
0605
ECM
1 or 2
×
or —
P1065
1065
ECM BACK UP/CIRC
2
×
P1121
1121
ETC ACTR
1 or 2
×
P1122
1122
ETC FUNCTION/CIRC
1
×
P1124
1124
ETC MOT PWR
1
×
P1126
1126
ETC MOT PWR
1
×
P1128
1128
ETC MOT
1
×
P1217
1217
ENG OVER TEMP
1
×
P1223
1223
TP SEN 2/CIRC
1
×
P1224
1224
TP SEN 2/CIRC
1
×
P1225
1225
CTP LEARNING
2
—
P1226
1226
CTP LEARNING
2
—
P1227
1227
APP SEN 2/CIRC
1
×
P1228
1228
APP SEN 2/CIRC
1
×
P1229
1229
SENSOR POWER/CIRC
1
×
P1610 - P1615
1610 - 1615
NATS MALFUNCTION
2
—
P1805
1805
BRAKE SW/CIRCUIT
1
×
DTC
*1
Items
(CONSULT-II screen terms)
Trip
MI lighting
up
Reference page
CONSULT-II
ECM
*2
PRECAUTIONS
EC-559
[QG (WITHOUT EURO-OBD)]
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PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EBS00QUH
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 SRS 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 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.
On Board Diagnostic (OBD) System of Engine
EBS00QUI
The ECM has an on board diagnostic system. It will light up the malfunction indicator (MI) 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 MI to light up.
●
Be sure to connect and lock the connectors securely after work. A loose (unlocked) connector will
cause the MI 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 “HARNESS CON-
NECTOR”, EL-7.
●
Be sure to route and secure the harnesses properly after work. The interference of the harness
with a bracket, etc. may cause the MI to light up due to the short circuit.
●
Be sure to erase the unnecessary malfunction information (repairs completed) from the ECM
before returning the vehicle to the customer.
Precaution
EBS00QUJ
●
Always use a 12 volt battery as power source.
●
Do not attempt to disconnect battery cables while engine is
running.
●
Before connecting or disconnecting the ECM harness con-
nector, turn ignition switch OFF and disconnect battery
ground cable. Failure to do so may damage the ECM
because battery voltage is applied to ECM even if ignition
switch is turned off.
●
Before removing parts, turn ignition switch OFF and then
disconnect battery ground cable.
SEF289H
EC-560
[QG (WITHOUT EURO-OBD)]
PRECAUTIONS
●
Do not disassemble ECM.
●
If battery cable is disconnected, the memory will return to
the initial ECM values.
The ECM will now start to self-control at its initial values.
Engine operation can vary slightly when the cable is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.
●
When
connecting
ECM
harness
connector,
fasten
it
securely with a lever as far as it will go as shown at right.
●
When connecting or disconnecting pin connectors into or
from ECM, take care not to damage pin terminals (bend or
break).
Make sure that there are not any bends or breaks on ECM
pin terminal, when connecting pin connectors.
●
Securely connect ECM harness connectors.
A poor connection can cause an extremely high (surge)
voltage to develop in coil and condenser, thus resulting in
damage to ICs.
●
Keep engine control system harness at least 10 cm (4 in)
away from adjacent harness, to prevent engine control sys-
tem malfunctions due to receiving external noise, degraded
operation of ICs, etc.
●
Keep engine control system parts and harness dry.
●
Before replacing ECM, perform “ECM Terminals and Refer-
ence Value” inspection and make sure ECM functions prop-
erly. Refer to
EC-610, "ECM Terminals and Reference Value"
.
●
Handle mass air flow sensor carefully to avoid damage.
●
Do not disassemble mass air flow sensor.
●
Do not clean mass air flow sensor with any type of deter-
gent.
●
Do not disassemble electric throttle control actuator.
●
Even a slight leak in the air intake system can cause seri-
ous incidents.
●
Do not shock or jar the camshaft position sensor (PHASE), crankshaft position sensor (POS).
PBIB1164E
MBIB0145E
PBIB0090E
MEF040D
PRECAUTIONS
EC-561
[QG (WITHOUT EURO-OBD)]
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EC
●
After performing each TROUBLE DIAGNOSIS, perform
“DTC
Confirmation
Procedure”
or
“Overall
Function
Check”.
The DTC should not be displayed in the “DTC Confirmation
Procedure” if the repair is completed. The “Overall Func-
tion Check” should be a good result if the repair is com-
pleted.
●
When measuring ECM signals with a circuit tester, connect
a break-out box (SST) and Y-cable adapter (SST) between
the ECM and ECM harness connector.
●
When measuring ECM signals with a circuit tester, never
allow the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.
●
Do not use ECM ground terminals when measuring input/
output voltage. Doing so may result in damage to the ECM's
transistor. Use a ground other than ECM terminals, such as
the ground.
●
Do not operate fuel pump when there is no fuel in lines.
●
Tighten fuel hose clamps to the specified torque.
SAT652J
SEF348N
MBIB0046E
EC-562
[QG (WITHOUT EURO-OBD)]
PRECAUTIONS
●
Do not depress accelerator pedal when starting.
●
Immediately after starting, do not rev up engine unneces-
sarily.
●
Do not rev up engine just prior to shutdown.
●
When installing C.B. ham radio or a mobile phone, be sure
to observe the following as it may adversely affect elec-
tronic control systems depending on installation location.
–
Keep the antenna as far as possible from the electronic
control units.
–
Keep the antenna feeder line more than 20 cm (8 in) away
from the harness of electronic controls.
Do not let them run parallel for a long distance.
–
Adjust the antenna and feeder line so that the standing-
wave radio can be kept smaller.
–
Be sure to ground the radio to vehicle body.
●
Regarding V10 models with A/T, “B1” indicates bank 1 (cyl-
inders number 1 and 4), “B2” indicates bank 2 (cylinders
number 2 and 3).
Wiring Diagrams and Trouble Diagnosis
EBS00QUK
When you read wiring diagrams, refer to the following:
●
“HOW TO READ WIRING DIAGRAMS”, GI-11
●
“POWER SUPPLY ROUTING”, EL-11 for power distribution circuit
When you perform trouble diagnosis, refer to the following:
●
“How to Follow Test Groups in Trouble Diagnoses”, GI-32
●
“HOW TO PERFORM EFFICIENT DIAGNOSES FOR AN ELECTRICAL INCIDENT”, GI-21
SEF709Y
SEF708Y
SEF440Y
PREPARATION
EC-563
[QG (WITHOUT EURO-OBD)]
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PREPARATION
PFP:00002
Special Service Tools
EBS00QUL
Commercial Service Tools
EBS00QUM
Tool number
Tool name
Description
KV10117100
Heated oxygen
sensor wrench
Loosening or tightening heated oxygen sensors
with 22 mm (0.87 in) hexagon nut
KV10114400
Heated oxygen
sensor wrench
Loosening or tightening heated oxygen sensors
a: 22 mm (0.87 in)
KV109E0010
Break-out box
Measuring ECM signals with a circuit tester
KV109E0080
Y-cable adapter
Measuring ECM signals with a circuit tester
S-NT379
S-NT636
S-NT825
S-NT826
Tool name
Description
Quick connector
release
Removing fuel tube quick connectors in engine
room
(Available in SEC. 164 of PARTS CATALOG: Part
No. 16441 6N210)
Fuel filler cap adapter
Checking fuel tank vacuum relief valve opening
pressure
PBIC0198E
S-NT653
EC-564
[QG (WITHOUT EURO-OBD)]
PREPARATION
Socket wrench
Removing and installing engine coolant
temperature sensor
Oxygen sensor thread
cleaner
ie: (J-43897-18)
(J-43897-12)
Reconditioning the exhaust system threads
before installing a new oxygen sensor. Use with
anti-seize lubricant shown below.
a: 18 mm diameter with pitch 1.5 mm for
Zirconia Oxygen Sensor
b: 12 mm diameter with pitch 1.25 mm for
Titania Oxygen Sensor
Anti-seize lubricant
ie: (Permatex
TM
133AR or equivalent
meeting MIL
specification MIL-A-
907)
Lubricating oxygen sensor thread cleaning tool
when reconditioning exhaust system threads.
Tool name
Description
S-NT705
AEM488
S-NT779
ENGINE CONTROL SYSTEM
EC-565
[QG (WITHOUT EURO-OBD)]
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ENGINE CONTROL SYSTEM
PFP:23710
System Diagram - M/T Models
EBS00QUN
MBIB0239E
EC-566
[QG (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
System Diagram - A/T Models
EBS00QUO
MBIB0240E
ENGINE CONTROL SYSTEM
EC-567
[QG (WITHOUT EURO-OBD)]
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EC
Vacuum Hose Drawing
EBS00QUP
Refer to
EC-565, "System Diagram - M/T Models"
or
EC-566, "System Diagram - A/T Models"
for Vac-
uum Control System.
MBIB0013E
EC-568
[QG (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
System Chart
EBS00QUQ
*1: This sensor is not used to control the engine system under normal conditions.
*2: The signals are sent to the ECM through CAN communication line.
*3: The output signals are sent from the ECM through CAN communication line.
Multiport Fuel Injection (MFI) System
EBS00QUR
INPUT/OUTPUT SIGNAL CHART
*1: Under normal conditions, this sensor is not for engine control operation.
*2: This signal is sent to the ECM through CAN communication line.
*3: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
Input (Sensor)
ECM Function
Output (Actuator)
●
Camshaft position sensor (PHASE)
●
Crankshaft position sensor (POS)
●
Mass air flow sensor
●
Engine coolant temperature sensor
●
Heated oxygen sensor 1
●
Throttle position sensor
●
Accelerator pedal position sensor
●
Park/neutral position (PNP) switch
●
Intake air temperature sensor
●
Power steering pressure sensor
●
Ignition switch
●
Stop lamp switch
●
Battery voltage
●
Knock sensor
●
Refrigerant pressure sensor
●
Heated oxygen sensor 2
*1
●
TCM (Transmission control module)
*2
●
Air conditioner switch
*2
●
Vehicle speed signal
*2
●
Electrical load signal
*2
Fuel injection & mixture ratio control
Fuel injectors
Electronic ignition system
Power transistor
Fuel pump control
Fuel pump relay
On board diagnostic system
MI (On the instrument panel)
*3
Intake valve timing control
Intake valve timing control solenoid
valve
Heated oxygen sensor 1 heater control
Heated oxygen sensor 1 heater
Heated oxygen sensor 2 heater control
Heated oxygen sensor 2 heater
EVAP canister purge flow control
EVAP canister purge volume control
solenoid valve
Air conditioning cut control
Air conditioner relay
*3
Cooling fan control
Cooling fan relays
*3
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
*3
and piston position
Fuel injection & mix-
ture ratio control
Fuel injectors
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Heated oxygen sensor 1
Density of oxygen in exhaust gas
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Park/neutral position (PNP) switch
Gear position
Knock sensor
Engine knocking condition
Battery
Battery voltage
*3
Power steering pressure sensor
Power steering operation
Heated oxygen sensor 2
*1
Density of oxygen in exhaust gas
Vehicle speed signal
*2
Vehicle speed
Air conditioner switch
*2
Air conditioner operation
ENGINE CONTROL SYSTEM
EC-569
[QG (WITHOUT EURO-OBD)]
C
D
E
F
G
H
I
J
K
L
M
A
EC
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from the crankshaft position sensor (POS), camshaft position
sensor (PHASE) and the mass air flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.
<Fuel increase>
●
During warm-up
●
When starting the engine
●
During acceleration
●
Hot-engine operation
●
When selector lever is changed from “N” to “D” (A/T models)
●
High-load, high-speed operation
<Fuel decrease>
●
During deceleration
●
During high engine speed operation
MIXTURE RATIO FEEDBACK CONTROL (CLOSED LOOP CONTROL)
The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission control.
The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This system uses
heated oxygen sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean. The ECM
adjusts the injection pulse width according to the sensor voltage signal. For more information about heated
oxygen sensor 1, refer to
(M/T models) or
(A/T models). This maintains the mixture ratio
within the range of stoichiometric (ideal air-fuel mixture).
This stage is referred to as the closed loop control condition.
Heated oxygen sensor 2 is located downstream of the three way catalyst (manifold). Even if the switching
characteristics of heated oxygen sensor 1 shift, the air-fuel ratio is controlled to stoichiometric by the signal
from heated oxygen sensor 2.
Open Loop Control
The open loop system condition refers to when the ECM detects any of the following conditions. Feedback
control stops in order to maintain stabilized fuel combustion.
●
Deceleration and acceleration
●
High-load, high-speed operation
●
Malfunction of heated oxygen sensor 1 or its circuit
●
Insufficient activation of heated oxygen sensor 1 at low engine coolant temperature
●
High engine coolant temperature
●
During warm-up
●
After shifting from “N” to “D” (A/T models)
●
When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated oxygen
sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to
the theoretical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as orig-
PBIB0121E
EC-570
[QG (WITHOUT EURO-OBD)]
ENGINE CONTROL SYSTEM
inally designed. Both manufacturing differences (i.e., mass air flow sensor hot film) and characteristic changes
during operation (i.e., injector clogging) directly affect mixture ratio.
Accordingly, the difference between the basic and theoretical mixture ratios is monitored in this system. This is
then computed in terms of “injection pulse duration” to automatically compensate for the difference between
the two ratios.
“Fuel trim” refers to the feedback compensation value compared against the basic injection duration. Fuel trim
includes short term fuel trim and long term fuel trim.
“Short term fuel trim” is the short-term fuel compensation used to maintain the mixture ratio at its theoretical
value. The signal from heated oxygen sensor 1 indicates whether the mixture ratio is RICH or LEAN compared
to the theoretical value. The signal then triggers a reduction in fuel volume if the mixture ratio is rich, and an
increase in fuel volume if it is lean.
“Long term fuel trim” is overall fuel compensation carried out long-term to compensate for continual deviation
of the short term fuel trim from the central value. Such deviation will occur due to individual engine differences,
wear over time and changes in the usage environment.
FUEL INJECTION TIMING
Two types of systems are used.
Sequential Multiport Fuel Injection System
Fuel is injected into each cylinder during each engine cycle according to the firing order. This system is used
when the engine is running.
Simultaneous Multiport Fuel Injection System
Fuel is injected simultaneously into all four cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The four injectors will then receive the signals two times for each engine cycle.
This system is used when the engine is being started and/or if the fail-safe system (CPU) is operating.
FUEL SHUT-OFF
Fuel to each cylinder is cut off during deceleration or operation of the engine at excessively high speeds.
Electronic Ignition (EI) System
EBS00QUS
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: The ECM determines the start signal status by the signals of engine speed and battery voltage.
SEF337W
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
*2
and piston position
Ignition timing control
Power transistor
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Knock sensor
Engine knocking
Park/neutral position (PNP) switch
Gear position
Battery
Battery voltage
*2
Vehicle speed signal
*1
Vehicle speed
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