Jeep 200 Cherokee Service Manual page 1255

9 - 6 ENGINE
DIAGNOSIS AND TESTING (Continued)
CONDITION
ENGINE RPM WILL NOT
REACH RATED SPEED
(CONT.)
LOW POWER
2000 JEEP CHEROKEE
POSSIBLE CAUSES
6. Improperly operating injection pump.
1. Fuel control lever not moving to full
throttle.
2. High oil level.
3. Engine overloaded.
4. Slow throttle response caused by
leaking or obstructed air control tube
or improperly operating control in the
pump.
5. Inadequate intake air flow.
6. Inadequate fuel supply. Air in the
fuel.
7. Excessive exhaust restriction.
8. High fuel temperature.
9. Poor quality fuel or fuel
contaminated with gasoline.
10. Air leak between the turbocharger
and the intake manifold.
11. Exhaust leak at the manifold or
turbocharger.
12. Improperly operating turbocharger.
13. Wastegate operation.
14. Valve not operating.
15. Worn or improperly operating
injectors.
16. Incorrect injection pump timing.
17. Improperly operating injection
pump.
CORRECTION
6. Repair or replace injection pump.
1. Check/correct for stop-to-stop travel.
2. Check/correct oil level.
3. Check for added loading from
accessories or driven units, brakes
dragging and other changes in vehicle
loading. Repair/replace as needed.
4. Check for leaks and obstructions.
Tighten the fittings. Repair or replace
the pump if the controls are not
functioning.
5. Inspect/replace air cleaner element.
Look for other restrictions.
6. Check the flow through the filter to
locate the source of the restriction.
Check fuel pressure and inlet
restriction.
7. Check/correct the restriction in the
exhaust system.
8. Verify that fuel heater is off when
engine is warm. Check for restricted
fuel drain tubes. Repair/replace as
needed.
9. Verify by operating from a temporary
tank with good fuel. Check for
presence of gasoline. Replace
fuel/water separator filter.
10. Check/correct leaks in hoses,
gaskets, charge air cooler and around
mounting capscrews or through holes
in the manifold cover.
11. Check/correct leaks in the manifold
or turbocharger gaskets. If manifold is
cracked, replace manifold.
12. Inspect/replace turbocharger.
13. Check wastegate operation.
14. Check for bent push rod, replace if
necessary.
15. Check/replace injectors.
16. Verify injection pump timing (see
Group 14, Fuel System).
17. Repair or replace injection pump.
XJ