Nissan Murano Z50 (2006 year). Manual — part 77
INDEX FOR DTC
EC-11
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*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: The troubleshooting for this DTC needs CONSULT-II.
*5: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.
Alphabetical Index
NBS003F2
NOTE:
●
If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to
EC-152, "DTC U1000, U1001 CAN COMMUNICATION LINE"
.
●
If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer
to
EC-155, "DTC U1010 CAN COMMUNICATION"
P1778
1778
STEP MOTR FNC
P1800
1800
VIAS S/V CIRC
P1805
1805
BRAKE SW/CIRCUIT
P2100
2100
ETC MOT PWR
P2101
2101
ETC FUNCTION/CIRC
P2103
2103
ETC MOT PWR
P2118
2118
ETC MOT
P2119
2119
ETC ACTR
P2122
2122
APP SEN 1/CIRC
P2123
2123
APP SEN 1/CIRC
P2127
2127
APP SEN 2/CIRC
P2128
2128
APP SEN 2/CIRC
P2135
2135
TP SENSOR
P2138
2138
APP SENSOR
P2A00
2A00
A/F SENSOR1 (B1)
P2A03
2A03
A/F SENSOR1 (B2)
DTC*
1
Items
(CONSULT-II screen terms)
Reference page
CONSULT-II
GST*
2
ECM*
3
Items
(CONSULT-II screen terms)
DTC*
1
Reference page
CONSULT-II
GST*
2
ECM*
3
A/F SEN1 HTR (B1)
P0031
0031
A/F SEN1 HTR (B1)
P0032
0032
A/F SEN1 HTR (B2)
P0051
0051
A/F SEN1 HTR (B2)
P0052
0052
A/F SENSOR1 (B1)
P0130
0130
A/F SENSOR1 (B1)
P0131
0131
A/F SENSOR1 (B1)
P0132
0132
A/F SENSOR1 (B1)
P0133
0133
A/F SENSOR1 (B1)
P2A00
2A00
A/F SENSOR1 (B2)
P0150
0150
A/F SENSOR1 (B2)
P0151
0151
A/F SENSOR1 (B2)
P0152
0152
A/F SENSOR1 (B2)
P0153
0153
A/F SENSOR1 (B2)
P2A03
2A03
EC-12
INDEX FOR DTC
Revision: 2006 August
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A/T TCC S/V FNCTN
P0744
0744
APP SENSOR
P2138
2138
APP SEN 1/CIRC
P2122
2122
APP SEN 1/CIRC
P2123
2123
APP SEN 2/CIRC
P2127
2127
APP SEN 2/CIRC
P2128
2128
ASCD BRAKE SW
P1572
1572
ASCD SW
P1564
1564
ASCD VHL SPD SEN
P1574
1574
ATF TEMP SEN/CIRC
P0710
0710
BRAKE SW/CIRCUIT
P1805
1805
CAN COMM CIRCUIT
U1000
1000*
4
CAN COMM CIRCUIT
U1001
1001*
4
CKP SEN/CIRCUIT
P0335
0335
CLOSED LOOP-B1
P1148
1148
CLOSED LOOP-B2
P1168
1168
CMP SEN/CIRC-B1
P0340
0340
CMP SEN/CIRC-B2
P0345
0345
COLD START CONTROL
P1421
1421
CONTROL UNIT(CAN)
U1010
1010
CTP LEARNING
P1225
1225
CTP LEARNING
P1226
1226
CVT C/U FUNCT
P1700
1700
CYL 1 MISFIRE
P0301
0301
CYL 2 MISFIRE
P0302
0302
CYL 3 MISFIRE
P0303
0303
CYL 4 MISFIRE
P0304
0304
CYL 5 MISFIRE
P0305
0305
CYL 6 MISFIRE
P0306
0306
ECM
P0605
0605
ECM BACK UP/CIRCUIT
P0603
0603
ECT SEN/CIRC
P0117
0117
ECT SEN/CIRC
P0118
0118
ECT SENSOR
P0125
0125
ENG OVER TEMP
P1217
1217
ETC ACTR
P2119
2119
ETC FUNCTION/CIRC
P2101
2101
ETC MOT
P2118
2118
ETC MOT PWR
P2100
2100
ETC MOT PWR
P2103
2103
EVAP GROSS LEAK
P0455
0455
EVAP PURG FLOW/MON
P0441
0441
Items
(CONSULT-II screen terms)
DTC*
1
Reference page
CONSULT-II
GST*
2
ECM*
3
INDEX FOR DTC
EC-13
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EVAP SMALL LEAK
P0442
0442
EVAP SYS PRES SEN
P0451
0451
EVAP SYS PRES SEN
P0452
0452
EVAP SYS PRES SEN
P0453
0453
EVAP VERY SML LEAK
P0456
0456
FTT SEN/CIRCUIT
P0182
0182
FTT SEN/CIRCUIT
P0183
0183
FTT SENSOR
P0181
0181
FUEL LEVEL SENSOR
P0461
0461
FUEL LEVL SEN/CIRC
P0462
0462
FUEL LEVL SEN/CIRC
P0463
0463
FUEL LEV SEN SLOSH
P0460
0460
FUEL SYS-LEAN-B1
P0171
0171
FUEL SYS-LEAN-B2
P0174
0174
FUEL SYS-RICH-B1
P0172
0172
FUEL SYS-RICH-B2
P0175
0175
HO2S2 HTR (B1)
P0037
0037
HO2S2 HTR (B1)
P0038
0038
HO2S2 HTR (B2)
P0057
0057
HO2S2 HTR (B2)
P0058
0058
HO2S2 (B1)
P0137
0137
HO2S2 (B1)
P0138
0138
HO2S2 (B1)
P0139
0139
HO2S2 (B2)
P0157
0157
HO2S2 (B2)
P0158
0158
HO2S2 (B2)
P0159
0159
IAT SEN/CIRCUIT
P0112
0112
IAT SEN/CIRCUIT
P0113
0113
IAT SENSOR
P0127
0127
INT/V TIM CONT-B1
P0011
0011
INT/V TIM CONT-B2
P0021
0021
INT/V TIM V/CIR-B1
P0075
0075
INT/V TIM V/CIR-B2
P0081
0081
IN PULY SPEED
P1715
1715
INPUT SPD SEN/CIRC
P0715
0715
ISC SYSTEM
P0506
0506
ISC SYSTEM
P0507
0507
KNOCK SEN/CIRC-B1
P0327
0327
KNOCK SEN/CIRC-B1
P0328
0328
L/PRESS SOL/CIRC
P0745
0745
LU-SLCT SOL/CIRC
P1740
1740
MAF SEN/CIRCUIT
P0101
0101
Items
(CONSULT-II screen terms)
DTC*
1
Reference page
CONSULT-II
GST*
2
ECM*
3
EC-14
INDEX FOR DTC
Revision: 2006 August
2006 Murano
*1: 1st trip DTC No. is the same as DTC No.
*2: This number is prescribed by SAE J2012.
*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.
*4: The troubleshooting for this DTC needs CONSULT-II.
*5: When the fail-safe operations for both self-diagnoses occur at the same time, the MIL illuminates.
MAF SEN/CIRCUIT
P0102
0102
MAF SEN/CIRCUIT
P0103
0103
MULTI CYL MISFIRE
P0300
0300
NATS MALFUNCTION
P1610 - P1615
1610 - 1615
NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.
P0000
0000
—
P-N POS SW/CIRCUIT
P0850
0850
PNP SW/CIRC
P0705
0705
PRS CNT SOL/A FCTN
P0746
0746
PRS CNT SOL/B FCTN
P0776
0776
PRS CNT SOL/B CIRC
P0778
0778
PURG VOLUME CONT/V
P0443
0443
PURG VOLUME CONT/V
P0444
0444
PURG VOLUME CONT/V
P0445
0445
PW ST P SEN/CIRC
P0550
0550
SENSOR POWER/CIRC
P0643
0643
STEP MOTR CIRC
P1777
1777
STEP MOTR FNC
P1778
1778
TCC SOLENOID/CIRC
P0740
0740
TCS/CIRC
P1212
1212
TCS C/U FUNCTN
P1211
1211
THERMSTAT FNCTN
P0128
0128
TP SENSOR
P2135
2135
TP SEN 1/CIRC
P0222
0222
TP SEN 1/CIRC
P0223
0223
TP SEN 2/CIRC
P0122
0122
TP SEN 2/CIRC
P0123
0123
TR PRS SENS/A CIRC
P0840
0840
TR PRS SENS/B CIRC
P0845
0845
TW CATALYST SYS-B1
P0420
0420
TW CATALYST SYS-B2
P0430
0430
V/SP SEN (A/T OUT)
P1720
1720
VEH SPD SEN/CIR AT*
5
P0720
0720
VEH SPEED SEN/CIRC*
5
P0500
0500
VENT CONTROL VALVE
P0447
0447
VENT CONTROL VALVE
P0448
0448
VIAS S/V CIRC
P1800
1800
Items
(CONSULT-II screen terms)
DTC*
1
Reference page
CONSULT-II
GST*
2
ECM*
3
PRECAUTIONS
EC-15
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PRECAUTIONS
PFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
NBS002YC
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 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 and CVT
NBS002YD
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 negative battery 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
.
●
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 EVAP system or 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.
Precaution
NBS002YE
●
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-16
PRECAUTIONS
Revision: 2006 August
2006 Murano
●
Do not disassemble ECM.
●
If a battery cable is disconnected, the memory will return to
the ECM value.
The ECM will now start to self-control at its initial value.
Engine operation can vary slightly when the terminal is dis-
connected. However, this is not an indication of a malfunc-
tion. Do not replace parts because of a slight variation.
●
If the battery is disconnected, the following emission-
related diagnostic information will be lost within 24 hours.
–
Diagnostic trouble codes
–
1st trip diagnostic trouble codes
–
Freeze frame data
–
1st trip freeze frame data
–
System readiness test (SRT) codes
–
Test values
●
When connecting ECM harness connector, fasten it
securely with levers as far as they will go as shown in the
figure.
●
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-102, "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
PBIB1512E
PBIB0090E
MEF040D
PRECAUTIONS
EC-17
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●
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 Function
Check should be a good result if the repair is completed.
●
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.
●
B1 indicates the bank 1, B2 indicates the bank 2 as shown
in the figure.
SEF217U
SEF348N
SEC893C
EC-18
PRECAUTIONS
Revision: 2006 August
2006 Murano
●
Do not operate fuel pump when there is no fuel in lines.
●
Tighten fuel hose clamps to the specified torque.
●
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.
PBIB1356E
SEF709Y
SEF708Y
PREPARATION
EC-19
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PREPARATION
PFP:00002
Special Service Tools
NBS002YG
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
EG17650301
(J-33984-A)
Radiator cap tester
adapter
Adapting radiator cap tester to radiator cap and
radiator filler neck
a: 28 (1.10) dia.
b: 31.4 (1.236) dia.
c: 41.3 (1.626) dia.
Unit: mm (in)
KV10117100
(J-36471-A)
Heated oxygen
sensor wrench
Loosening or tightening heated oxygen sensor with
22 mm (0.87 in) hexagon nut
KV10114400
(J-38365)
Heated oxygen
sensor wrench
Loosening or tightening heated oxygen sensor
a: 22 mm (0.87 in)
(J-44321)
Fuel pressure gauge
kit
Checking fuel pressure
KV109E0010
(J-46209)
Break-out box
Measuring the ECM signals with a circuit tester
KV109E0080
(J-45819)
Y-cable adapter
Measuring the ECM signals with a circuit tester
S-NT564
S-NT379
S-NT636
LEC642
S-NT825
S-NT826
EC-20
PREPARATION
Revision: 2006 August
2006 Murano
Commercial Service Tools
NBS002YH
Tool name
(Kent-Moore No.)
Description
Leak detector
i.e.: (J-41416)
Locating the EVAP leak
EVAP service port
adapter
i.e.: (J-41413-OBD)
Applying positive pressure through EVAP service
port
Fuel filler cap adapter
i.e.: (MLR-8382)
Checking fuel tank vacuum relief valve opening
pressure
Socket wrench
Removing and installing engine coolant
temperature sensor
Oxygen sensor thread
cleaner
i.e.: (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
i.e.: (Permatex
TM
133AR or equivalent
meeting MIL
specification MIL-A-
907)
Lubricating oxygen sensor thread cleaning tool
when reconditioning exhaust system threads.
S-NT703
S-NT704
S-NT815
S-NT705
AEM488
S-NT779
ENGINE CONTROL SYSTEM
EC-21
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ENGINE CONTROL SYSTEM
PFP:23710
System Diagram
NBS002YI
PBIB2307E
EC-22
ENGINE CONTROL SYSTEM
Revision: 2006 August
2006 Murano
Multiport Fuel Injection (MFI) System
NBS002YJ
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system. This is used only for the on board diagnosis.
*2: This signals is sent to the ECM through CAN communication line.
*3: 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
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 both the crankshaft position sensor 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 shift lever is changed from N to D
●
High-load, high-speed operation
<Fuel decrease>
●
During deceleration
●
During high engine speed operation
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*
3
Piston position
Fuel injection
& mixture ratio
control
Fuel injector
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor
Engine coolant temperature
Air fuel ratio (A/F) 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
Air conditioner switch
Air conditioner operation*
2
Wheel sensor
Vehicle speed*
2
ENGINE CONTROL SYSTEM
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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 air
fuel ratio (A/F) sensor 1 in the exhaust manifold to monitor whether the engine operation is rich or lean. The
ECM adjusts the injection pulse width according to the sensor voltage signal. For more information about air
fuel ratio (A/F) sensor 1, refer to
EC-229, "DTC P0130, P0150 A/F SENSOR 1"
. 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 air fuel ratio (A/F) 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 A/F sensor 1 or its circuit
●
Insufficient activation of A/F sensor 1 at low engine coolant temperature
●
High engine coolant temperature
●
During warm-up
●
After shifting from N to D
●
When starting the engine
MIXTURE RATIO SELF-LEARNING CONTROL
The mixture ratio feedback control system monitors the mixture ratio signal transmitted from A/F sensor 1.
This feedback signal is then sent to the ECM. The ECM controls the basic mixture ratio as close to the theoret-
ical mixture ratio as possible. However, the basic mixture ratio is not necessarily controlled as originally
designed. Both manufacturing differences (i.e., mass air flow sensor hot wire) and characteristic changes dur-
ing operation (i.e., fuel 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 A/F sensor 1 indicates whether the mixture ratio is RICH or LEAN compared to the the-
oretical 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.
PBIB3020E
EC-24
ENGINE CONTROL SYSTEM
Revision: 2006 August
2006 Murano
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 six cylinders twice each engine cycle. In other words, pulse signals of
the same width are simultaneously transmitted from the ECM.
The six fuel 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, operation of the engine at excessively high speeds or oper-
ation of the vehicle at excessively high speeds.
Electronic Ignition (EI) System
NBS002YK
INPUT/OUTPUT SIGNAL CHART
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
Firing order: 1 - 2 - 3 - 4 - 5 - 6
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of the
engine. The ignition timing data is stored in the ECM.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Comput-
ing this information, ignition signals are transmitted to the power transistor.
During the following conditions, the ignition timing is revised by the ECM according to the other data stored in
the ECM.
●
At starting
●
During warm-up
●
At idle
●
At low battery voltage
SEF179U
Sensor
Input Signal to ECM
ECM function
Actuator
Crankshaft position sensor (POS)
Engine speed*
2
Piston position
Ignition timing
control
Power transistor
Camshaft position sensor (PHASE)
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
Wheel sensor
Vehicle speed*
1
ENGINE CONTROL SYSTEM
EC-25
C
D
E
F
G
H
I
J
K
L
M
A
EC
Revision: 2006 August
2006 Murano
●
During acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions. If engine knocking occurs, the knock sensor monitors the condition.
The signal is transmitted to the ECM. The ECM retards the ignition timing to eliminate the knocking condition.
Fuel Cut Control (at No Load and High Engine Speed)
NBS002YL
INPUT/OUTPUT SIGNAL CHART
*: This signal is sent to the ECM through CAN communication line.
SYSTEM DESCRIPTION
If the engine speed is above 1,800 rpm under no load (for example, the shift position is neutral and engine
speed over is 1,800 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies
based on engine speed.
Fuel cut will be operated until the engine speed reaches 1,500 rpm, then fuel cut will be cancelled.
NOTE:
This function is different from deceleration control listed under “Multiport Fuel Injection (MFI) System”,
Sensor
Input Signal to ECM
ECM function
Actuator
Park/neutral position (PNP) switch
Neutral position
Fuel cut con-
trol
Fuel injector
Accelerator pedal position sensor
Accelerator pedal position
Engine coolant temperature sensor
Engine coolant temperature
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed
Wheel sensor
Vehicle speed*
EC-26
AIR CONDITIONING CUT CONTROL
Revision: 2006 August
2006 Murano
AIR CONDITIONING CUT CONTROL
PFP:23710
Input/Output Signal Chart
NBS002YM
*1: This signal is sent to the ECM through CAN communication line.
*2: ECM determines the start signal status by the signals of engine speed and battery voltage.
System Description
NBS002YN
This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned OFF.
●
When the accelerator pedal is fully depressed.
●
When cranking the engine.
●
At high engine speeds.
●
When the engine coolant temperature becomes excessively high.
●
When operating power steering during low engine speed or low vehicle speed.
●
When engine speed is excessively low.
●
When refrigerant pressure is excessively low or high.
Sensor
Input Signal to ECM
ECM function
Actuator
Air conditioner switch
Air conditioner ON signal*
1
Air conditioner
cut control
Air conditioner relay
Accelerator pedal position sensor
Accelerator pedal position
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed*
2
Engine coolant temperature sensor
Engine coolant temperature
Battery
Battery voltage*
2
Refrigerant pressure sensor
Refrigerant pressure
Power steering pressure sensor
Power steering operation
Wheel sensor
Vehicle speed*
1
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