Jeep Cherokee 2000 Service Manual - page 1233
(1) Be sure that the battery connections are tight
and not corroded.
(2) Be sure that the 60 way connector is fully
engaged with the PCM (Fig. 9).
(3) Be sure that the 68 way connector is fully
engaged with the MSA (Fig. 10)
(4) Verify that the electrical connections for the
ASD relay are clean and free of corrosion. This relay
is located in the PDC. For the location of the relay
within the PDC, refer to label on PDC cover.
(5) Verify that the electrical connections for the
fuel heater relay are clean and free of corrosion. This
relay is located in the PDC. For the location of the
relay within the PDC, refer to label on PDC cover.
(6) Be sure the electrical connectors at the ends of
the glow plugs (Fig. 11) are tight and free of corro-
sion.
(7) Be sure that the electrical connections at the
glow plug relay are tight and not corroded. The glow
plug relay is located in the engine compartment on
the left–inner fender (Fig. 12).
(8) Inspect the starter motor and starter solenoid
connections for tightness and corrosion.
(9) Verify that the Fuel Injection Pump electrical
connector is firmly connected. Inspect the connector
for corrosion or damaged wires. The solenoid is
mounted to the rear of the injection pump (Fig. 13).
(10) Verify that the fuel heater electrical connector
is firmly attached to the filter bowl at the bottom of
the fuel filter/water separator. Inspect the connector
for corrosion or damaged wires.
(11) Verify that the electrical pigtail connector
(sensor connector) (Fig. 14) for the fuel injector sen-
sor is firmly connected to the engine wiring harness.
Inspect the connector for corrosion or damaged wires.
This sensor is used on the #1 cylinder injector only.
(12) Inspect for exhaust system restrictions such
as pinched exhaust pipes or a collapsed or plugged
muffler.
(13) Verify that the harness connector is firmly
connected to the vehicle speed sensor (Fig. 15).
Fig. 9 PCM Location—Typical
1 – PCM HARNESS CONNECTOR C1
2 – PCM HARNESS CONNECTOR C2
3 – PCM HARNESS CONNECTOR C3
4 – POWERTRAIN CONTROL MODULE (PCM)
Fig. 10 ECM Location—LHD
1 – ECM HARNESS CONNECTOR C1
2 – ENGINE CONTROL MODULE (ECM)
3 – ECM HARNESS CONNECTOR C2
4 – ACCELERATOR PEDAL POSITION SENSOR
Fig. 11 Glow Plug Connector
1 – GLOW PLUG ELECTRICAL CONNECTOR
XJ
FUEL SYSTEM—2.5L DIESEL ENGINE
14 - 7
DIAGNOSIS AND TESTING (Continued)