Nissan X-Trail 32. Manual — part 832

SYSTEM

EC-457

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ENGINE CONTROL SYSTEM : Circuit Diagram

INFOID:0000000010986230

JSBIA5315GB

EC-458

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SYSTEM

ENGINE CONTROL SYSTEM : Fail Safe

INFOID:0000000010986231

NON DTC RELATED ITEM

JSBIA4979GB

SYSTEM

EC-459

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DTC RELATED ITEM

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

Detected

items

Engine operating condition

in fail-safe mode

Remarks

Reference page

Malfunction
indicator
lamp 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-791, "Compo-

nent Function

Check"

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.

P0014
P0078

Exhaust valve timing control

—

—

×

—

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.

EC-460

< SYSTEM DESCRIPTION >

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SYSTEM

MULTIPORT FUEL INJECTION SYSTEM

P0171
P0172

Fuel injection system

×

—

—

—

P0197
P0198

Engine oil temperature sensor

—

—

—

Exhaust valve timing control does not function.

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 power supply circuit

—

×

—

—

P0605

ECM

—

—

—

ECM stops the electric throttle control actuator control, throttle
valve is maintained at a fixed opening (approx. 5 degrees) by
the return spring.

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

×

—

×

—

P1568

Signal invalid

—

—

—

Active trace control does not function.

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