Jeep Cherokee 2000 Service Manual - page 866
(7) Connect vehicle to an oscilloscope and inspect
spark events for fouled or damaged spark plugs or
cables.
(8) Verify generator output wire, generator connec-
tor and ground wire are firmly connected to genera-
tor.
(9) Inspect system body grounds for loose or dirty
connections. Refer to Group 8, Wiring for ground
locations.
(10) Verify crankcase ventilation (CCV) operation.
Refer to Group 25, Emission Control System for addi-
tional information.
(11) Inspect fuel tube quick-connect fitting-to-fuel
rail connections.
(12) Verify hose connections to all ports of vacuum
fittings on intake manifold are tight and not leaking.
(13) Inspect accelerator cable, transmission throt-
tle cable (if equipped) and cruise control cable con-
nections (if equipped). Check their connections to
throttle arm of throttle body for any binding or
restrictions.
(14) If equipped with vacuum brake booster, verify
vacuum booster hose is firmly connected to fitting on
intake manifold. Also check connection to brake vac-
uum booster.
(15) Inspect air cleaner inlet and air cleaner ele-
ment for dirt or restrictions.
(16) Inspect radiator grille area, radiator fins and
air conditioning condenser for restrictions.
(17) Verify intake manifold air temperature sensor
wire connector is firmly connected to harness connec-
tor (Fig. 7) or (Fig. 8).
(18) Verify MAP sensor electrical connector is
firmly connected to MAP sensor (Fig. 8). Also verify
rubber L-shaped fitting from MAP sensor to throttle
body is firmly connected (Fig. 9).
(19) Verify fuel injector wire harness connectors
are firmly connected to injectors in correct order.
Each harness connector is numerically tagged with
injector number (INJ 1, INJ 2 etc.) of its correspond-
ing fuel injector and cylinder number.
(20) Verify harness connectors are firmly con-
nected to idle air control (IAC) motor and throttle
position sensor (TPS) (Fig. 8).
(21) Verify wire harness connector is firmly con-
nected to engine coolant temperature sensor (Fig.
10).
(22) Raise and support vehicle.
Fig. 6 Ignition Coil—4.0L Engine
1 – REAR OF VALVE COVER
2 – COIL RAIL
3 – SLIDE TAB
4 – RELEASE LOCK
5 – COIL CONNECTOR
Fig. 7 Intake Manifold Air Temp. Sensor Location—
2.5L Engine
1 – ELECTRICAL CONNECTOR
2 – INTAKE MANIFOLD TEMPERATURE SENSOR
3 – FUEL INJECTOR
14 - 38
FUEL SYSTEM
XJ
DIAGNOSIS AND TESTING (Continued)