The Distributorless Ignition System (DIS) uses several electronic
sensors instead of a distributor. It also uses one coil for every two
cylinders. The components in the system are:
The crankshaft timing sensor consists of a single Hall effect
magnetic switch activated by 3 vanes on the crankshaft damper and
pulley assembly. This sensor sends a signal that feeds timing and rpm
information to the DIS and EEC-IV module.
The camshaft sensor is driven by the camshaft; it provides
information on the cylinder position for the ignition coil and fuel
system.
The DIS ignition module receives the signal from the crankshaft
sensor and the camshaft sensor. It also receives the spark signal
from the EEC-IV module. This module's major purpose is to use the
information supplied to it to control the ignition coils. The reason
it does this is to ensure that they fire in the correct sequence. The
DIS module also controls the engine dwell.
The ignition coil pack has multiple ignition coils. The DIS module
controls these coils by means of coil leads. The ignition coils fire
two spark plugs simultaneously; one on the compression stroke and one
on the exhaust stroke.
