Ignition Systems; Distributor Cap; Distributor Cap Inspection—Typical - Dodge D150 1990 Service Manual

•
IGNITION SYSTEMS 8D - 1
IGNITION SYSTEMS
CONTENTS
Page Page
COMPONENT IDENTIFICATION 1 SERVICE PROCEDURES 11
DIAGNOSTIC PROCEDURES 9 SPECIFICATIONS 15
COMPONENT IDENTIFICATION
INDEX
Page
Auto Shutdown (ASD) Relay 7
Coolant Temperature Sensor 7
Distributor Cap 1
Distributor Rotor
2
General Information 1
Hall Effect Pick-Up Assembly 6
GENERAL INFORMATION
T h i s section contains basic diagnostic procedures
for the i g n i t i o n systems of 3.9L V-6 engines and 5.2L
and 5.9L V - 8 engines. I n f o r m a t i o n r e g a r d i n g " O n
Board Diagnostics" can be found i n t h e Single Point
F u e l Injection and D u a l Point F u e l Injection sections
of Group 14—Fuel Systems. A specifications section
is included a t the end o f t h i s group. General m a i n t e -
nance i n f o r m a t i o n for i g n i t i o n related items can be
found i n Group 0, L u b r i c a t i o n and Maintenance, and
t h e Operating Instructions and Product I n f o r m a t i o n
M a n u a l .
DISTRIBUTOR CAP
INSPECTION
Remove the distributor cap and wipe i t clean w i t h
a d r y l i n t free cloth. V i s u a l l y inspect t h e cap for
cracks, carbon paths, broken towers, w h i t e deposits
on t h e inside (caused by condensation e n t e r i n g t h e
cap t h r o u g h cracks), and damaged rotor b u t t o n (Fig.
1). The machined surface o f a t e r m i n a l end (faces to-
w a r d rotor) w i l l indicate some evidence o f erosion
f r o m n o r m a l operation. T h e residue can be removed
w i t h a sharp knife. E x a m i n e t h e t e r m i n a l ends for
evidence of mechanical interference w i t h t h e rotor
t i p .
Page
Ignition Coil 8
Manifold Absolute Pressure (MAP) Sensor . . . . . . . 7
Single Board Engine Controller ( S B E C ) . . . . . . . . . 6
Spark Plug Cables
2
Spark Plugs 3
A cap t h a t is greasy or d i r t y or has a powder-like
substance on the inside should be cleaned w i t h a so-
l u t i o n of w a r m water and a m i l d detergent. Scrub
w i t h a soft brush, t h o r o u g h l y rinse, and dry w i t h a
clean soft cloth.
BROKEN
- 4 1
Fig. 1 Distributor Cap Inspection—Typical
I f replacement of the d i s t r i b u t o r cap is necessary,
t r a n s f e r s p a r k p l u g w i r e s f r o m t h e o r i g i n a l c a p
t o t h e n e w c a p o n e a t a t i m e . E n s u r e t h a t e a c h
w i r e i s i n s t a l l e d i n t o t h e t o w e r o f t h e n e w c a p
t h a t c o r r e s p o n d s t o i t s t o w e r p o s i t i o n i n t h e
o r i g i n a l c a p . F u l l y seat t h e w i r e s i n t o t h e t o w -
ers.