Dodge RAM TRUCK 1500 1995 Service Manual page 1119

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COMPONENT DESCRIPTION/SYSTEM OPERATION—EXCEPT DIESEL 14 - 37
switching the ground path to each individual injector
on and off. Injector pulse width is the period of time
that.the injector is energized. The PCM will adjust
injector pulse width based on various inputs it re­
ceives.
Fig. 10 Fuel injector internal Components—Typical
During start up, battery voltage is supplied to the
injectors through the ASD relay. When the engine is
operating, voltage is supplied by the charging sys­
tem. The PCM determines injector pulse width based
on various inputs.
The fuel injectors are attached to the fuel rail (Fig.
11). 3.9L V-6 engines use six injectors. 5.2L and 5.9L
V-8 engines use eight injectors.
The nozzle ends of the injectors are positioned into
openings in the intake manifold just above the intake
valve ports of the cylinder head. The engine wiring
harness connector for each fuel injector is equipped
with an attached numerical tag (INJ 1, INJ 2 etc.).
This is used to identify each fuel injector with its re­
spective cylinder number.
S.OL 1MO
ENGINE
Pin #13 is used as the ground control circuit for the
fuel injectors on cylinders #5 and #8 on the 8.0L V-10
engine (both injectors are fired simultaneously—one
cylinder on compression stroke and one cylinder on
exhaust stroke).
FUEL INJECTORS—PCM PIN #14—PCM OUTPUT
3.9L/5.2L/5.9L ENGINES
Pin #14 is used as the ground control circuit for the
fuel injector on cylinder #3 on 3.9L/5.2L/5.9L engines.
Refer to Fuel Injectors-PCM Pin #13--PCM Output
for information.
S.OL V-fO ENGINE
Pin #14 is used as the ground control circuit for the
fuel injectors on cylinders #3 and #6 on the 8.0L V-10
FUEL
INJECTOR J9214-30
Fig. 11 Fuel Injectors—Typical
engine (both injectors are fired simultaneously—one
cylinder on compression stroke and one cylinder on
exhaust stroke).
FUEL INJECTORS—PCM PIN #15—PCM OUTPUT
3.BL/5.21/S.BL ENGINES
Pin #15 is used as the ground control circuit for the
fuel injector on cylinder #2 on 3.9L/5.2L/5.9L engines.
Refer to Fuel Injectors-PCM Pin #13-PCM Output
for information.
8 . 0 L V-10 ENGINE
Pin #15 is used as the ground control circuit for the
fuel injectors on cylinders #9 and #4 on the 8.0L V-10
engine (both injectors are fired simultaneously—one
cylinder on compression stroke and one cylinder on
exhaust stroke).
FUEL INJECTORS—PCM P I N #16—PCM OUTPUT
3.BL/S.2U5.BL ENGINES
Pin #16 is used as the ground control circuit for the
fuel injector on cylinder #1 on 3.9L/5.2L/5.9L engines.
Refer to Fuel Injectors-PCM Pin #13-PCM Output
for information.
8.0L V-fO ENGINE
Pin #16 is used as the ground control circuit for the
fuel injectors on cylinders #1 and #10 on the 8.0L
V-10 engine (both injectors are fired simultaneous­
ly—one cylinder on compression stroke and one cyl­
inder on exhaust stroke).