Automatic Shutdown Relay; Crankshaft Position Sensor - Chrysler 1998 Viper RT/10 Owner's Manual

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IGNITION SYSTEM 80 - 3
DESCRIPTION AND OPERATION ( C o n t i n u e d !
1, 2, 3, 4, 6, and 7. The coil pack on the r i g h t side,
contains two i n d i v i d u a l coils and fires cylinders 5, 8,
9, and 10. When one of the coils discharges, i t fires
two cylinders at the same t i m e (one cylinder on its
compression stroke, the other on its exhaust stroke).
The Powertrain Control Module (PCM) energizes
the i n d i v i d u a l ignition coils i n each pack. The P C M
can determine cylinder identification from the crank-
shaft position sensor and camshaft position sensor
inputs.
Fig. 3 ignition Coil Packs
Fig. 4 ignition Coil Packs
AUTOMATIC SHUTDOWN RELAY
The relay is located i n the Power D i s t r i b u t i o n Cen-
ter (PDC) (Fig. 5). For the location of the relay
w i t h i n the PDC, refer to the PDC cover for location.
Check electrical terminals for corrosion and repair as
necessary.
Fig. 5 Power Distribution Center (PDC)
CRANKSHAFT POSITION SENSOR
The crankshaft position sensor detects slots cut
into a disk i n the middle of the crankshaft (Fig. 6).
There are 5 sets of slots. Each set contains 2 slots,
for a total of 10 slots. Basic t i m i n g is determined by
the position of the last slot i n each group. Once the
Powertrain Control Module (PCM) senses the last
slot, i t determines crankshaft position (which piston
w i l l be next at TDC) from the camshaft position sen-
sor i n p u t . I t may take the P C M up to one engine rev-
olution to determine crankshaft position d u r i n g
cranking.
Fig. 6 Timing Slots on Crankshaft