Dodge ram truck 3500 1996 Service Manual page 1278

14 - 44 FUEL SYSTEM
DIAGNOSIS AND TESTING (Continued)
(2) Inspect the battery cable connections. Be sure
that they are clean and tight.
(3) Inspect fuel pump relay and air conditioning
compressor clutch relay (if equipped). Inspect the
ASD relay * connections. Inspect starter motor relay
connections. Inspect relays for signs of physical dam­
age and corrosion. The relays are located In the
Power Distribution Center (PDC) (Fig. 35). Refer to
label on PDC cover for relay location.
Fig. 35 Power Distribution Center (PDC)
(4) Inspect ignition coil connections. Verify that coil
secondary cable is firmly connected to coil (Fig. 36).
Fig. 36 Ignition Coil—3.9U5.2U5.9L Engines—Typical
(5) Verify that distributor cap is correctly attached
to distributor. Be sure that spark plug cables are
firmly connected to the distributor cap and the spark
plugs are in their correct firing order. Be sure that
coil cable is firmly connected to distributor cap and
coil. Be sure that camshaft position sensor wire con­
nector (at the distributor) is firmly connected to har­
ness connector. Inspect spark plug condition. Refer to
Group 8D, Ignition. Connect vehicle to an oscilloscope
and inspect spark events for fouled or damaged spark
plugs or cables.
(6) Verify that generator output wire, generator
connector and ground wire are firmly connected to
the generator.
(7) Inspect the system body grounds for loose or
dirty connections. Refer to Group 8, Wiring for
ground locations.
(8) Verify positive crankcase ventilation (PCV) valve
operation. Refer to Group 25, Emission Control System
for additional information. Verify PCV valve hose is
firmly connected to PCV valve and manifold (Fig. 37).
Fig. 37 PCV Valve Hose Connections—3.9U5.2U
5.9L Engines—Typical
(9) Inspect fuel tube quick-connect fitting-to-fuel
rail connections.
(10) Verify that hose connections to all ports of
vacuum fittings on intake manifold are tight and not
leaking.
(11) Inspect accelerator cable, transmission throt­
tle cable (if equipped) and cruise control cable con­
nections (if equipped). Check their connections to the
throttle arm of throttle body for any binding or
restrictions.
(12) I f equipped with vacuum brake booster, verify
that vacuum booster hose is firmly connected to fit­
ting on intake manifold. Also check connection to
brake vacuum booster.
(13) Inspect the air cleaner inlet and air cleaner
element for dirt or restrictions.
(14) Inspect radiator grille area, radiator fins and
air conditioning condenser for restrictions.
(15) Verify that the intake manifold air tempera­
ture sensor wire connector is firmly connected to har­
ness connector (Fig. 38) or (Fig. 39).
(16) Verify that MAP sensor electrical connector is
firmly connected to MAP sensor (Fig. 40). Also verify
that rubber L-shaped fitting from MAP sensor to the
throttle body is firmly connected (Fig. 41).