Nissan Sentra. Manual — part 334
EC-32
< SYSTEM DESCRIPTION >
[MRA8DE]
SYSTEM
SYSTEM
ENGINE CONTROL SYSTEM
ENGINE CONTROL SYSTEM : System Description
INFOID:0000000009758360
SYSTEM DIAGRAM
NOTE:
JSBIA3138GB
SYSTEM
EC-33
< SYSTEM DESCRIPTION >
[MRA8DE]
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• Position switch and clutch pedal position switch are not used in models with CVT.
• ASCD steering switch and brake pedal position switch are used in models with ASCD.
• TCM and transmission range switch are not used in models with M/T.
SYSTEM DESCRIPTION
ECM controls the engine by various functions.
ENGINE CONTROL SYSTEM : Fail Safe
INFOID:0000000009758361
NON DTC RELATED ITEM
DTC RELATED ITEM
Function
Reference
Fuel injection control
EC-35, "MULTIPORT FUEL INJECTION SYSTEM : System De-
scription"
Electric ignition control
EC-38, "ELECTRIC IGNITION SYSTEM : System Description"
Intake valve timing control
EC-39, "INTAKE VALVE TIMING CONTROL : System Description"
Exhaust valve timing control
EC-41, "EXHAUST VALVE TIMING CONTROL : System Descrip-
tion"
Intake manifold runner control
EC-43, "INTAKE MANIFOLD RUNNER CONTROL : System De-
scription"
Intake manifold tuning control
EC-43, "INTAKE MANIFOLD TUNING SYSTEM : System Descrip-
tion"
Engine protection control (Low engine oil pressure)
EC-44, "ENGINE PROTECTION CONTROL AT LOW ENGINE
OIL PRESSURE : System Description"
Fuel filler cap warning system
EC-45, "FUEL FILLER CAP WARNING SYSTEM : System De-
scription"
Air conditioning cut control
EC-46, "AIR CONDITIONING CUT CONTROL : System Descrip-
tion"
Cooling fan control
EC-47, "COOLING FAN CONTROL : System Description"
Starter motor drive control
EC-48, "STARTER MOTOR DRIVE CONTROL : System Descrip-
tion"
Evaporative emission
EC-49, "EVAPORATIVE EMISSION SYSTEM : System Descrip-
tion"
Automatic speed control
EC-51, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : Sys-
tem Description"
ECO mode control
•
DMS-6, "ECO MODE CONTROL : System Description"
(M/T
models)
•
DMS-26, "ECO MODE CONTROL : System Description"
models)
SPORT mode control
•
DMS-6, "ECO MODE CONTROL : System Description"
(M/T
models)
•
DMS-63, "SPORT MODE CONTROL : System Description"
(CVT models)
CAN communication
EC-52, "CAN COMMUNICATION : System Description"
Detected
items
Engine operating condition
in fail-safe mode
Remarks
Reference page
Malfunction
indicator
circuit
Engine speed will not rise
more than 2,500 rpm due
to the fuel cut
When there is an open circuit on MIL circuit, the ECM cannot warn the
driver by lighting up MIL when there is malfunction on engine control
system.
Therefore, when electrical controlled throttle and part of ECM related
diagnoses are continuously detected as NG for 5 trips, ECM warns the
driver that engine control system malfunctions and MIL circuit is open
by means of operating fail safe function.
The fail safe function also operates when above diagnoses except MIL
circuit are detected and demands the driver to repair the malfunction.
EC-34
< SYSTEM DESCRIPTION >
[MRA8DE]
SYSTEM
Description
When a DTC is detected, ECM executes a mode (in the Fail-safe mode) applicable to the DTC. The fail-safe
mode has the preset traveling control mode (accelerator angle variation and engine output limit) and device fix
mode.
Fail Safe Pattern
Fail Safe List
×:Applicable —: Not applicable
Fail safe mode
Vehicle behavior
Traveling con-
trol mode
Accelerator an-
gle variation
control
ECM controls the accelerator pedal depression speed to make it slower than actual speed. This
causes a drop in accelerating performance and encourages the driver to repair malfunction.
NOTE:
ECM does not control the accelerator pedal releasing speed.
Engine output
control
ECM reduces the engine output, according to the rise in engine speed. This reduces the vehicle
speed to encourage the driver to repair malfunction.
Device fix mode
• This mode fixes the IVT control solenoid valve and the EVT control solenoid valve in the refer-
ence position.
• The intake manifold runner control valve motor is turned OFF (intake manifold runner control
valve opens).
Pattern
Fail safe mode
A
Traveling control mode
Accelerator angle variation control
B
Engine output control
C
Device fix mode
DTC
No.
Detected items
Vehicle behavior
Pattern
Others
A
B
C
P0011
Intake valve timing control
—
—
×
ECM activates the IVT intermediate lock control solenoid
valve to bring the cam sprocket into an intermediate lock con-
dition.
P0075
Intake valve timing control
—
—
×
ECM activates the IVT intermediate lock control solenoid
valve to bring the cam sprocket into an intermediate lock con-
dition.
P0014
P0078
Exhaust valve timing control
—
—
×
—
P0101
P0102
P0103
Mass air flow sensor circuit
×
×
×
—
P0122
P0123
P0222
P0223
P2135
Throttle position sensor
—
—
—
The ECM controls the electric throttle control actuator in reg-
ulating the throttle opening in order for the idle position to be
within +10 degrees.
The ECM regulates the opening speed of the throttle valve to
be slower than the normal condition.
So, the acceleration will be poor.
P0117
P0118
Engine coolant temperature
sensor
×
×
—
—
P0171
P0172
Fuel injection system
×
—
—
—
P0196
P0197
P0198
Engine oil temperature sensor
—
—
—
Exhaust valve timing control does not function.
SYSTEM
EC-35
< SYSTEM DESCRIPTION >
[MRA8DE]
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MULTIPORT FUEL INJECTION SYSTEM
MULTIPORT FUEL INJECTION SYSTEM : System Description
INFOID:0000000009758362
SYSTEM DIAGRAM
P0300
P0301
P0302
P0303
P0304
Misfire
×
—
—
—
P0500
Vehicle speed sensor
×
—
—
—
P0524
Engine oil pressure
—
—
—
• ECM illuminates oil pressure warning lamp on the combina-
tion meter.
• Engine speed will not rise more than 4,000rpm due to the
fuel cut.
• Fail-safe is canceled when ignition switch OFF
→ ON.
P0603
ECM
×
×
—
—
P0605
ECM
×
×
—
—
P0643
Sensor power supply
—
—
—
ECM stops the electric throttle control actuator control, throttle
valve is maintained at a fixed opening (approx. 5 degrees) by
the return spring.
P1078
Exhaust valve timing control
position sensor circuit
×
—
×
—
P1650
P1651
Starter relay
×
×
—
P1805
Brake switch
—
—
—
ECM controls the electric throttle control actuator by regulat-
ing the throttle opening to a small range.
Therefore, acceleration will be poor.
Vehicle condition
Driving condition
When engine is idling
Normal
When accelerating
Poor acceleration
P2004
Intake manifold runner control
valve
—
×
×
—
P2100
P2103
Throttle control motor relay
—
—
—
ECM stops the electric throttle control actuator control, throttle
valve is maintained at a fixed opening (approx. 5 degrees) by
the return spring.
P2101
Electric throttle control func-
tion
—
—
—
ECM stops the electric throttle control actuator control, throttle
valve is maintained at a fixed opening (approx. 5 degrees) by
the return spring.
P2118
Throttle control motor
—
—
—
ECM stops the electric throttle control actuator control, throttle
valve is maintained at a fixed opening (approx. 5 degrees) by
the return spring.
P2119
Electric throttle control actua-
tor
×
×
—
—
P2122
P2123
P2127
P2128
P2138
Accelerator pedal position
sensor
—
—
—
The ECM controls the electric throttle control actuator in reg-
ulating the throttle opening in order for the idle position to be
within +10 degrees.
The ECM regulates the opening speed of the throttle valve to
be slower than the normal condition.
So, the acceleration will be poor.
DTC
No.
Detected items
Vehicle behavior
Pattern
Others
A
B
C
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