Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC)
Engine control system

ENGINE CONTROL SYSTEM : System Diagram

ENGINE CONTROL SYSTEM : System Diagram

NOTE:

Battery current sensor is used in CVT models.

ENGINE CONTROL SYSTEM : System Description

ECM performs various controls such as fuel injection control and ignition timing control.

ENGINE CONTROL SYSTEM : Fail Safe

NON DTC RELATED ITEM

Detected items Engine operating condition in failsafe mode Remarks
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.

DTC RELATED ITEM

DTC No. Detected items Engine operating condition in fail safe mode
P0011 Intake valve timing control The signal is not energized to the intake valve timing control solenoid valve and the valve control does not function.
P0014 Exhaust valve timing control The signal is not energized to the exhaust valve timing control solenoid valve and the valve control does not function.
P0101 P0102 P0103 Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117 P0118 Engine coolant temperature sensor circuit Engine coolant temperature will be determined by ECM based on the following conditions.

CONSULT displays the engine coolant temperature decided by ECM.

Condition Engine coolant temperature decided (CONSULT display)
Just as ignition switch is turned ON or START 40C (104F)
Approx. 4 minutes or more after engine starting 80C (176F)
Except as shown above 40 80C (104 176F) (Depends on the time)

When the fail safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running.

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.

P0196 P0197 P0198 Engine oil temperature sensor Exhaust valve timing control does not function.
P0500 Vehicle speed sensor The cooling fan operates (Highest) while engine is running.
P0524 Engine oil pressure
  • ECM illuminates oil pressure warning lamp on the combination meter.
  • Engine speed will not rise more than 4,000 rpm due to the fuel cut.
  • Failsafe is canceled when ignition switch OFF → ON.
P0605 ECM (When ECM calculation function is malfunctioning:) 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.
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 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 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 (When electric throttle control actuator does not function properly due to the return spring malfunction:) ECM controls the electric throttle actuator by regulating the throttle opening around the idle position. The engine speed will not rise more than 2,000 rpm.
(When throttle valve opening angle in fail safe mode is not in specified range:) ECM controls the electric throttle control actuator by regulating the throttle opening to 20 degrees or less.
(When ECM detects the throttle valve is stuck open:) While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the engine stalls.

The engine can restart in the Neutral position, and engine speed will not exceed 1,000 rpm or more.

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.

    More about «Engine control system (EC)»:

    Precaution

    Engine control system

    Structure and operation

    Engine control system

    Multiport fuel injection system

    Electric ignition system

    Air conditioning cut control

    Cooling fan control

    Evaporative emission system

    Intake valve timing control

    Exhaust valve timing control

    Engine protection control at low engine oil pressure

    Fuel filler cap warning system

    Automatic speed control device (ASCD)

    Automatic speed control device (ASCD)

    Diagnosis description

    Ecm

    Diagnosis and repair workflow

    Additional service when replacing ECM

    Accelerator pedal released position learning

    Throttle valve closed position learning

    Idle air volume learning

    Mixture ratio selflearning value clear

    Basic inspection

    Fuel pressure check

    How to set SRT code

    How to erase permanent DTC

    Trouble diagnosis specification value

    Power supply and ground circuit

    U0101 can comm circuit

    U1001 CAN comm circuit

    P0011 IVT control

    P0014 EVT control

    P0031, P0032 A/F sensor 1 heater

    P0037, P0038 HO2s2 heater

    P0075 IVT control solenoid valve

    P0078 EVT control solenoid valve

    P0101 MAF sensor

    P0102, P0103 MAF sensor

    P0111 IAT sensor

    P0112, P0113 IAT sensor

    P0116 ECT sensor

    P0117, P0118 ECT sensor

    P0122, P0123 TP sensor

    P0125 ECT sensor

    P0127 IAT sensor

    P0128 thermostat function

    P0130 A/F sensor 1

    P0131 A/F sensor 1

    P0132 A/F sensor 1

    P0137 HO2s2

    P0138 HO2s2

    P0139 HO2s2

    P014C, P014D, P015A, P015B, A/F sensor 1

    P0171 fuel injection system function

    P0181 FTT sensor

    P0182, P0183 FTT sensor

    P0196 EOT sensor

    P0197, P0198 EOT sensor

    P0222, P0223 TP sensor

    P0300, P0301, P0302, P0303, P0304 misfire

    P0327, P0328 KS

    P0335 CKP sensor (POC)

    P0340 CMP sensor (PHASE)

    P0420 three way catalyst function

    P0441 EVAP control system

    P0443 EVAP canister purge volume control solenoid valve

    P0444, P0445 EVAP canister purge volume control solenoid valve

    P0447 EVAP canister vent control valve

    P0448 EVAP canister vent control valve

    P0451 EVAP control system pressure sensor

    P0452 EVAP control system pressure sensor

    P0453 EVAP control system pressure sensor

    P0456 EVAP control system

    P0460 fuel level sensor

    P0461 fuel level sensor

    P0462, P0463 fuel level sensor

    P0500 VSS

    P0506 ISC system

    P0507 ISC system

    P050a, P050b, P050e cold start control

    P0520 EOP sensor

    P0524 engine oil pressure

    P0603 ECM power supply

    P0605 ECM

    P0607 ECM

    P0643 sensor power supply

    P0850 PNP switch

    P1078 EVT control position sensor

    P1148 closed loop control

    P117A air fuel ratio

    P1212 TCS communication line

    P1217 engine over temperature

    P1225 TP sensor

    P1226 TP sensor

    P1550 battery current sensor

    P1551, P1552 battery current sensor

    P1553 battery current sensor

    P1554 battery current sensor

    P1564 ASCD steering switch

    P1572 ASCD brake switch

    P1574 ASCD vehicle speed sensor

    P1715 Input speed sensor

    P1720 VSS

    P1805 brake switch

    P2096, P2097 A/F sensor 1

    P2100, P2103 throttle control motor relay

    P2101 electric throttle control function

    P2118 throttle control motor

    P2119 electric throttle control actuator

    P2122, P2123 APP sensor

    P2127, P2128 APP sensor

    P2135 TP sensor

    P2138 APP sensor

    Brake pedal position switch

    Clutch pedal position switch

    Cooling fan

    Electrical load signal

    Fuel injector

    Fuel pump

    Ignition signal

    Malfunction indicator lamp

    On board refueling vapor recovery (ORVR)

    Refrigerant pressure sensor

    Engine control system symptoms

    Normal operating condition

    IDLE SPEED

    Ignition timing

    Evaporative emission system

    EVAP leak check

    Positive crankcase ventilation

    Removal and installation

    Service data and specifications (SDS)

    Nissan Versa Sedan Service Manual / Engine / Engine control system (EC) / Engine control system

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