Secondary Circuit Diagnosis; Ssi System Schematic - Jeep J-10 Series 1982 Technical & Service Manual

1G-14 IGNITION SYSTEMS
TO MICROPROCESSOR*
RADIO INTERFERENCE CONDENSER
TO CARBURETOR
SOLENOID IF
REQUIRED
'USED ONLY WITH SIX-CYLINDER
ENGINES EQUIPPED WITH ELECTRONIC
FEEDBACK SYSTEM
13A-CJ
13F - CHEROKEE-WAGONEER-TRUCK
IGNITION
SWITCH
708653
Rg. 16-15 SSI System Schematic
The next step in diagnosinga failure is to identify the
circuit—primary or secondary—at fault.
The primary circuit consists of:
• ignition switch,
• battery-to-ignition coil wiring,
• ignition coil primary winding,
• all wires connected to the electronic ignition control
unit and distributor pickup coil,
• electronic ignition control unit, and
• distributor.
The secondary circuit consists of:
• ignition coil secondary winding,
• all high voltage wires connected to the distributor
cap, coil and spark plugs,
• distributor cap,
• distributor rotor, and
• spark plugs.
Secondary Circuit Diagnosis
CAUTION: When disconnecting a high voltage wire
from a spark plug or the distributor cap, twist the rub
ber boot slightly to break it loose. Grasp the boot, not
the wire, and pull offwith steady, even force.
(1) Disconnect ignition coil wire from center tower
of distributor cap. Use insulated pliers to hold wire
terminal approximately 1/2 inch from cylinder block,
head or intake manifold.
WARNING: Use extreme caution when engine is oper
ating. Do not stand in direct line with fan. Do not put
hands near pulleys, belts or fan. Do not wear loose
clothing.
(2) Rotate engine with starter motor and observe
wire terminal for arc.
(a) If no arc occurs, proceed with step (5).
(b) If arc occurs, proceed with step (3).