stamped on the left side of the engine block, just
below the oil dipstick tube (Fig. 1). The engine code
on the XJ 2.5L is DD85C followed by a 5 digit serial
number.

Fig. 1 Engine Code Location

ENGINE

9 - 1

2000 JEEP CHEROKEE

DIAGNOSIS AND TESTING

SERVICE DIAGNOSIS—DIESEL—
PERFORMANCE

CONDITION

POSSIBLE CAUSES

CORRECTION

ENGINE WILL NOT CRANK
OR CRANKS SLOWLY

1. Starting motor operating, but not
cranking the engine.

1. Remove the starter motor. Check for
broken flywheel teeth or a broken
starting motor spring.

2. Crankshaft rotation restricted.

2. Rotate the engine to check for
rotational resistance.

3. Starting circuit connections loose or
corroded.

3. Clean and tighten connections.

4. Neutral safety switch or starter relay
inoperative.

4. Check starter relay supply voltage
and proper operation of neutral safety
switch (if equipped). Replace defective
parts.

5. Battery charge low.

5. Check battery voltage. Replace
battery if a charge cannot be held.

Displacement . . . . . . . . 2.5L (2499 cc)
Bore . . . . . . . . . . . . . . . 92.00
Stroke . . . . . . . . . . . . . . 94.00
Compression Ratio . . . . 21:1

Vacuum at idle . . . . . . . 600 mm/Hg (23.6 In/Hg)
Belt Tension . . . . . . . . . 400/500 N Automatic

Tensioner

Thermostat Opening . . . 80°C

6 2°C

Generator Rating . . . . . Denso 12V—95A
Cooling System Capacity. 9.5 Liter
P/S Capacity . . . . . . . . . 0.75 Liter
Engine Oil Capacity . . . 7.2L w/filter change
Timing System . . . . . . . Pushrod operated overhead

valves, with gear-driven
camshaft in crankcase.

Air Intake . . . . . . . . . . . Dry filter.
Fuel Feed . . . . . . . . . . . Vane pump incorporated in

injection pump.

Fuel System . . . . . . . . . Indirect fuel injection

(precumbustion chamber).

Combustion Cycle . . . . . 4 stroke
Cooling System . . . . . . . Water cooling.
Injection Pump . . . . . . . Rotary pump and

electronically managed.

Lubrication . . . . . . . . . . Pressure lubrication by

rotary pump, full-flow
filtration.

Engine Rotation . . . . . . . Clockwise viewed from

front cover.

Engine Description

9 - 2

ENGINE

DIAGNOSIS AND TESTING (Continued)

2000 JEEP CHEROKEE

CONDITION

POSSIBLE CAUSES

CORRECTION

6. No voltage to starter solenoid.

6. Check voltage to solenoid. If
necessary, replace the solenoid.

7. Solenoid or starter motor
inoperative.

7. Replace starter motor.

ENGINE CRANKS, BUT WILL
NOT START NO SMOKE

1. No fuel in supply tank.

1. Fill fuel supply.

2. Electrical fuel shutdown solenoid not
operating.

2. Check for loose wires and verify that
the fuel shutdown solenoid and fuel
shutdown solenoid relay is functioning.

3. Exhaust plugged.

3. Remove the obstruction.

4. Fuel filter plugged.

4. Drain fuel/water separator and
replace fuel filter.

5. Excessive fuel inlet restriction.

5. Check fuel inlet restriction. Correct
cause.

6. Injection pump not getting fuel or
fuel is aerated.

6. Check fuel flow/bleed fuel system.

7. Worn or inoperative injection pump.

7. Visually check delivery with
externally connected injector to one of
the pump outlets. Repair or replace the
pump if fuel is not being delivered.

ENGINE HARD TO START,
OR WILL NOT START
SMOKE FROM EXHAUST

1. Incorrect starting procedure.

1. The fuel shutoff solenoid control
must be in the run position. Ensure
proper procedure is being used.

2. Cranking speed too slow.

2. (A) Verify that the transmission is not
engaged.
(B) Check the battery, starting motor
and look for loose or corroded wiring
connections.

3. Cylinder heads heater plugs relay
defective.

3. Verify system is working. Repair/
replace inoperative parts.

4. One or more cylinder head heater
plugs defective.

4. Verify system is working. Repair/
replace inoperative parts.

5. Insufficient intake air.

5. Inspect or replace filter and check
for obstruction to the air supply tube.

ENGINE

9 - 3

DIAGNOSIS AND TESTING (Continued)

2000 JEEP CHEROKEE

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