Nissan Sentra manuals

Nissan Sentra Service Manual: Engine control system

ENGINE CONTROL SYSTEM : System Description

SYSTEM DIAGRAM

NOTE:


NOTE:

SYSTEM DESCRIPTION

ECM controls the engine by various functions.

Function

Reference

Fuel injection control EC-35, "MULTIPORT FUEL INJECTION SYSTEM : System Description"
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 Description"
Intake manifold runner control EC-43, "INTAKE MANIFOLD RUNNER CONTROL : System Description"
Intake manifold tuning control EC-43, "INTAKE MANIFOLD TUNING SYSTEM : System Description"
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 Description"
Air conditioning cut control EC-46, "AIR CONDITIONING CUT CONTROL : System Description"
Cooling fan control EC-47, "COOLING FAN CONTROL : System Description"
Starter motor drive control EC-48, "STARTER MOTOR DRIVE CONTROL : System Description"
Evaporative emission EC-49, "EVAPORATIVE EMISSION SYSTEM : System Description"
Automatic speed control EC-51, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
ECO mode control
  • DMS-6, "ECO MODE CONTROL : System Description" (M/T models)
  • DMS-26, "ECO MODE CONTROL : System Description" (CVT 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"

ENGINE CONTROL SYSTEM : Fail Safe

NON DTC RELATED ITEM

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-467, "Component Function Check"

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 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

Fail Safe List


Fail Safe List


Multiport fuel injection system


System
...

Multiport fuel injection system
MULTIPORT FUEL INJECTION SYSTEM : System Description SYSTEM DIAGRAM *1: ECM determines the start signal status by the signals of engine speed and battery voltage. *2: M/T models *3: CVT mod ...

Other materials:

Basic inspection
DIAGNOSIS AND REPAIR WORK FLOW Work Flow NOTE: “DTC” includes DTC at the 1st trip. 1.OBTAIN INFORMATION ABOUT SYMPTOM Refer to TM-140, "Diagnostic Work Sheet" and interview the customer to obtain the malfunction information (conditions and environment when the malfunctio ...

Precaution
Precaution for supplemental restraint system (srs) "air bag" and "seat belt pre-tensioner" 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 injur ...

Steering gear and linkage
Exploded View REMOVAL Steering gear assembly Front suspension member Front Removal and Installation REMOVAL Set steering wheel to the straight-ahead position. Remove floor cover (1). Lower shaft assembly (2). Remove the lower shaft assembly bo ...

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