Chrysler RAM TRUCK 2500 1994 Service Manual page 980

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FUEL SYSTEM 14 - 39
ing bracket located above the right engine valve
cover (Fig. 12). The coil packs are not oil filled. The
front coil pack contains three independent epoxy
filled coils. The rear coil pack contains two indepen­
dent epoxy filled coils.
Refer to Group 8D, Ignition System for additional
information.
Fig. 12 Ignition Coil Packs—8.0L ¥-10 Engine
FUEL INJECTORS—PCM PIN #18—PCM OUTPUT
5 . 2 L / 5 . 9 L ENGINES
Pin #18 is used as the ground control circuit for the
fuel injector on cylinder #8 on 5.2L/5.9L engines. Re­
fer to Fuel Injectors-PCM Pin # 1 3 - P C M Output for
information.
IGNITION COIL DRIVER—PCM PIN #18—PCM
OUTPUT
8.0L V-10 ENGINE
Pin #18 is used as the ground control circuit for the
ignition coils operating cylinders #2 and #3 on the
8.0L V-10 engine (both coils are fired simultaneous-
ly).
IGNITION COIL DRIWER—PCM PIN #11—PCM
OUTPUT
3.9L/5.2L/SML ENGINES
Pin #19 is used as the ground control circuit for the
ignition coil.
System voltage is supplied to the ignition coil pos­
itive terminal. The powertrain control module (PCM)
then operates the ignition coil through an on/off
ground signal. Base (initial) ignition timing is
not adjustable. The PCM adjusts ignition timing to
meet changing engine operating conditions.
The ignition coil is located near the front of the
right cylinder head (Fig. 13 or 14).
Refer to Group 8D, Ignition System for additional
information.
Fig. 13 Ignition Coil—3.9U5.2U5.9L LDC-Gas
Engine
Fig. 14 Ignition Coil—5.9L HDC-Gas Engine
8.0L V - f 0 ENGINE
Pin #19 is used as the ground control circuit for the
ignition coils operating cylinders #1 and #6 on the
8.0L V-10 engine (both coils are fired simultaneous-
ly).
Refer to Group 8D, Ignition System for additional
information.
GENERATOR FIELD—PCM PIN #20—PCM OUTPUT
The powertrain control module (PCM) regulates the
charging system voltage within a range of 12.9 to
15.0 volts. Refer to Group 8A for charging system in­
formation.
INTAKE MANIFOLD AIR TEMPERATURE SENSOR—
PCM PIN #21—PCM INPUT
The intake manifold air temperature sensor is a
variable, thermistor type. It reacts to temperature