Power Distribution Center; Diagnosis And Testing; Visual Inspection - Jeep cherokee 2000 Service Manual

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DESCRIPTION AND OPERATION (Continued)
transmission control cable (when equipped) are con-
nected to the throttle body linkage arm.
A (factory adjusted) set screw is used to mechani-
cally limit the position of the throttle body throttle
plate. Never attempt to adjust the engine idle
speed using this screw. All idle speed functions are
controlled by the PCM.

DIAGNOSIS AND TESTING

VISUAL INSPECTION

A visual inspection for loose, disconnected or incor-
rectly routed wires and hoses should be made. This
should be done before attempting to diagnose or ser-
vice the fuel injection system. A visual check will
help spot these faults and save unnecessary test and
diagnostic time. A thorough visual inspection will
include the following checks:
(1) Verify the three 32–way electrical connectors
are fully inserted into the connector of the Power-
train Control Module (PCM) (Fig. 3).
Fig. 3 Powertrain Control Module (PCM)
1 – (3) 32–WAY CONNECTORS
2 – PCM
(2) Inspect battery cable connections. Be sure they
are clean and tight.
(3) Inspect fuel pump relay and air conditioning
compressor clutch relay (if equipped). Inspect ASD
relay connections. Inspect starter motor relay connec-
tions. Inspect relays for signs of physical damage and
corrosion. The relays are located in Power Distribu-
tion Center (PDC) (Fig. 4). Refer to label on PDC
cover for relay location.
(4) 2.5L Engine: Inspect ignition coil primary con-
nection. Verify coil secondary cable is firmly con-
nected to coil (Fig. 5).
(5) 4.0L Engine: Inspect ignition coil connection
(Fig. 6).
Fig. 4 Power Distribution Center (PDC)
1 – POWER DISTRIBUTION CENTER (PDC)
Fig. 5 Ignition Coil—2.5L Engine
1 – IGNITION COIL
2 – ELECTRICAL CONNECTOR
3 – MOUNTING BOLTS
4 – SECONDARY CABLE
(6) 2.5L Engine: Verify that distributor cap is cor-
rectly attached to distributor. Be sure that spark
plug cables are firmly connected to the distributor
cap and spark plugs are in their correct firing order.
Be sure that coil cable is firmly connected to distrib-
utor cap and coil.
FUEL SYSTEM 14 - 37