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Home >> Nissan-Datsun >> 2019 >> Sentra SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Introduction And Basic Inspection) (1.8L) >> System Description >> System >> Engine Control System >> Fail Safe
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Fail Safe

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 mode

Vehicle behavior

Traveling control mode

Accelerator angle 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 reference position.
  • The intake manifold runner control valve motor is turned OFF (intake manifold runner control valve opens).

Fail Safe Pattern 

Pattern

Fail safe mode

A

Traveling control mode

Accelerator angle variation control

B

Engine output control

C

Device fix mode

Fail Safe List 

x:Applicable - : Not applicable

DTC No.

Detected items

Vehicle behavior

Pattern

Others

A

B

C

P0011

P0012

P0016

P0075

Intake valve timing control

-

-

x

-

P0014

P0015

P0017

P0078

Exhaust valve timing control

-

-

x

-

P0101

P0102

P0103

Mass air flow sensor circuit

x

x

x

-

P0122

P0123

P0222

P0223

P2135

Throttle position sensor

-

-

-

The ECM controls the electric throttle control actuator in regulating 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

x

x

-

-

P0171

P0172

Fuel injection system

x

-

-

-

P0197

P0198

Engine oil temperature sensor

-

-

-

Exhaust valve timing control does not function.

P0300

P0301

P0302

P0303

P0304

Misfire

x

-

-

-

P0500

Vehicle speed sensor

x

-

-

-

P0524

Engine oil pressure

-

-

-

  • ECM illuminates oil pressure warning lamp on the combination 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

-

-

-

-

-

x

-

ASCD operation may be deactivated.

P0604

ECM

x

-

x

ASCD operation may be deactivated.

P0605

P060B

ECM

-

-

-

-

x

-

x

ASCD operation may be deactivated.

P0606

ECM

-

-

-

ASCD operation may be deactivated.

x

-

x

ASCD operation may be deactivated.

P0607

ECM

-

-

-

-

-

x

-

-

P060A

ECM

x

-

x

-

x

x

x

ASCD operation may be deactivated.

P0643

ECM

x

-

x

-

P1078

Exhaust valve timing control position sensor circuit

x

-

x

-

P1568

ICC COMMAND VALUE

-

-

-

ICC cancelled

P1650

P1651

Starter relay

x

x

-

-

P1575

P1805

Brake switch

-

-

-

ECM controls the electric throttle control actuator by regulating 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

P2100

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 function

-

-

-

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 actuator

x

x

-

-

P2122

P2123

P2127

P2128

P2138

Accelerator pedal position sensor

-

-

-

The ECM controls the electric throttle control actuator in regulating 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.