Ignition Coil; Asd Relay Location; Ignition Coil Connections - Dodge D150 1990 Service Manual

8D - 8 IGNITION SYSTEMS
•
T h e A S D relay i s located i n t h e engine compart-
m e n t near the 50-way b u l k h e a d connector (Fig. 19).
PART THROTTLE^A/C CLUTCH CUTOUT STARTER
Fig. 19 ASD Relay Location
IGNITION COIL
T h e SBEC controls i g n i t i o n coil firing t h r o u g h t h e
auto shutdown (ASD) relay. W h e n the relay is ener-
gized b y the SBEC, battery voltage is supplied t o t h e
i g n i t i o n coil positive t e r m i n a l . The SBEC w i l l not en-
ergize t h e ASD relay u n t i l i t receives i n p u t f r o m t h e
d i s t r i b u t o r pick-up. Refer t o " A u t o Shutdown ( A S D )
Relay" i n t h i s section for relay operation.
The i g n i t i o n coil i s designed t o operate w i t h o u t a n
e x t e r n a l i g n i t i o n resistor. Inspect the coil for exter-
n a l leaks and arcing.
Test c o i l according t o coil tester manufacturer's i n -
structions. Test coil p r i m a r y resistance. Test coil sec-
ondary resistance. Replace a n y coil t h a t does n o t
meet specifications.
I f t h e i g n i t i o n coil i s replaced because o f a b u r n e d
tower, carbon t r a c k i n g , or a r c i n g a t either t h e tower,
nipple o r boot a t t h e coil end o f the secondary cable,
replace cable. A n y a r c i n g a t the tower w i l l carbonize
the n i p p l e . I n s t a l l i n g t h e cable on a n e w coil w i l l
cause t h e coil to f a i l .
I f secondary cables shows a n y signs o f damage,
they s h o u l d be replaced w i t h n e w cables. Damaged
cables can cause a r c i n g and f a i l u r e of a new coil.
The i g n i t i o n coil is mounted t o t h e dash panel a t
the r e a r o f the r i g h t side valve cover (Fig. 20).
TERMINAL ENGINE GROUND
Fig. 20 Ignition Coil Connections