ENGINE AND EMISSION CONTROL SYSTEM DESCRIPTION - Fuel Injection Control
EF & EC-16flowchartFuel Injection Control
INPUT/OUTPUT SIGNAL LINE
Crank angle sensor
Signal to E.C.C.S. control unitEngine speed and piston position
Air flow meter
Signal to E.C.C.S. control unitAmount of intake air
Engine temperature sensor
Signal to E.C.C.S. control unitEngine temperature
Exhaust gas sensor
Signal to E.C.C.S. control unitDensity of oxygen in exhaust gas
Throttle sensor
Signal to E.C.C.S. control unitThrottle valve position / Throttle valve idle position
Neutral switch
Signal to E.C.C.S. control unitGear position neutral
Vehicle speed sensor
Signal to E.C.C.S. control unitVehicle speed
Ignition switch
Signal to E.C.C.S. control unitStart signal
Air conditioner switch
Signal to E.C.C.S. control unitAir conditioner operation
Battery
Signal to E.C.C.S. control unitBattery voltage
Load switch
Signal to E.C.C.S. control unitHeadlamp + rear defogger on
ABS
Signal to E.C.C.S. control unitABS operating (N-CVT vehicles only)
Probable Cause
Corrective Action
E.C.C.S. control unit
Injector
Cause
E.C.C.S. control unit
Fix
Injector
BASIC FUEL INJECTION CONTROL
NOTE
The amount of fuel injected from the fuel injector, or the length of time the valve remains open, is determined by the E.C.U. The basic amount of fuel injected is a program value mapped in the E.C.U. ROM memory. In other words, the program value is preset by engine operating conditions determined by input signals (for engine rpm and air intake) from both the crank angle sensor and the air flow meter.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
NOTE
In addition, the amount of fuel injection is compensated to improve engine performance under various operating conditions as listed below.
〈Fuel increase〉
1) During warm-up
2) When starting the engine
3) During acceleration
〈Fuel decrease〉
1) During deceleration