ENGINE AND EMISSION CONTROL SYSTEM DESCRIPTION - Ignition Timing Control

EF & EC-19flowchart

Ignition Timing Control

Input source	Signal to E.C.C.S. control unit
Crank angle sensor	Engine speed and piston position
Air flow meter	Amount of intake air
Engine temperature sensor	Engine temperature
Throttle sensor	Throttle valve position / Throttle valve idle position
Vehicle speed sensor	Vehicle speed
Ignition switch	Start signal
Neutral switch	Gear position neutral
Battery	Battery voltage
Load switch	Headlamp + rear defogger on
A.B.S.	A.B.S. operating (N-CVT vehicles only)

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

Throttle sensor

Signal to E.C.C.S. control unitThrottle valve position / Throttle valve idle position

Vehicle speed sensor

Signal to E.C.C.S. control unitVehicle speed

Ignition switch

Signal to E.C.C.S. control unitStart signal

Neutral switch

Signal to E.C.C.S. control unitGear position neutral

Battery

Signal to E.C.C.S. control unitBattery voltage

Load switch

Signal to E.C.C.S. control unitHeadlamp + rear defogger on

A.B.S.

Signal to E.C.C.S. control unitA.B.S. operating (N-CVT vehicles only)

Probable Cause

Corrective Action

E.C.C.S. control unit

Power transistor

Cause

E.C.C.S. control unit

Fix

Power transistor