Ignition System; Control Unit - Jeep 1979 CJ-5 Technical & Service Manual

Table of Contents

Distributor, Coll, and Electronic Control Unit

Spark Control Systems

S E C T I O N

DISTRIBUTOR,

ELECTRONIC CONTROL WMm

Components 16-1

Distributor Component Replacement

Distributor Replacement

General 11-1

T i l l s 1G-21

Operation 1G-3

Specifications

Troubleshooting

The Solid State Ignition (SSI) system used on all Jeep

engines has no breaker points, cam or condenser. Cur-

rent flow through the coil is controlled by a trigger

wheel, a sensor and an electronic control unit. Conven-

tional rotor, advance mechanism and distributor cap are

The SSI system consists of several major components:

ignition switch, electronic ignition control unit, ignition

coil, primary resistance wire and bypass, distributor,

ignition wires and spark plugs.

C D i t f D i O l i t

The electronic control unit is a solid-state, moisture-

resistant module (fig. 1G-1). The component parts are

permanently sealed in a potting material to resist vibra-

tion and environmental conditions. All connections are

weatherproof. The control unit has built-in reverse po-

larity protection and transient voltage protection.

N O T E : When disconnecting

pull apart with firm, straight pull. Do not attempt to

pry apart with screwdriver.

When connecting, press to-

gether firmly to overcome hydraulic pressure of grease.

• ELECTRONIC

C O N T R O L U W H

N O T E : This unit is not repairable and must be serviced

Fig. 1G-1 Electronic Control Unit

Troubleshooting