Toyota 5R 1969 Repair Manual page 176

D E S C R I P T I O N
T h e ignition system
d elivers them to the spark plugs in "time" with the engine.
Each high-voltage surge jumps a c ro s s the spark plug gap and ignities the com ­
pressed air-fuel mixture.
T h e ignition system
secondary (high-voltage)
above illustration.
T h e primary circuit consists of the battery , distributor b r e a k e r points , condenser
and the ignition coil primary windings.
T h e secondary circuit consists of the ignition coil secondary windings, distributor
cap, rotor, high-tension wirings and the spark plugs.
When the b rea k er points a r e closed, the prim ary current flow s from the battery
through the ignition switch to the primary windings in the coil, then to ground
through the closed b re a k e r points.
When the b re a k e r points open, the magnetic field built up in the ignition coil p r i­
mary windings moves through the secondary windings of the coil producing high
voltage su rge.
T h e high voltage
high voltage flows
w h ere the rotor distributes it to one of the spark plug wiring in the distributor
c a p .
F ig . 10-1 Ignition System Wiring Diagram
produces high-voltage su rges of up-to 20,000 volts, and
is composed of the primary
circuit,
surge is produced each time the b re a k e r points open. T h e
through the coil
IG N IT I O N S Y S T E M - Description
Ig n itio n Coil
(lo w -vo lta g e) circuit and the
and the wiring diagram is as shown in the
high tension wiring to the distributor cap
D is tr ib u to r
G3138
10-1