Jeep Cherokee 2000 Service Manual - page 1944
When the engine is operating, fresh air enters the
engine and mixes with crankcase vapors. Manifold
vacuum draws the vapor/air mixture through the
fixed orifice and into the intake manifold. The vapors
are then consumed during combustion.
VEHICLE EMISSION CONTROL INFORMATION
(VECI) LABEL
DESCRIPTION
All vehicles are equipped with a combined VECI
label. This label is located in the engine compart-
ment (Fig. 6).
OPERATION
The VECI label contains the following:
•
Engine family and displacement
•
Evaporative family
•
Emission control system schematic
•
Certification application
•
Engine timing specifications (if adjustable)
•
Idle speeds (if adjustable)
•
Spark plug and gap
The label also contains an engine vacuum sche-
matic. There are unique labels for vehicles built for
sale in the state of California and the country of
Canada. Canadian labels are written in both the
English and French languages. These labels are per-
manently attached and cannot be removed without
defacing information and destroying label.
DIAGNOSIS AND TESTING
VACUUM SCHEMATICS
A vacuum schematic for emission related items can
be found on the Vehicle Emission Control Informa-
tion (VECI) label. For label location, refer to Vehicle
Emission Control Information (VECI) Label.
Fig. 4 CCV System—2.5L Engine—Typical
1 – AIR INLET FITTING
2 – AIR FILTER COVER
3 – FIXED ORIFICE FITTING
Fig. 5 CCV System—4.0L Engine—Typical
1 – AIR INLET FITTING
2 – FIXED ORIFICE FITTING
3 – AIR FILTER COVER
Fig. 6 VECI Label Location—Typical
1 – VECI LABEL
25 - 26
EMISSION CONTROL SYSTEMS
XJ
DESCRIPTION AND OPERATION (Continued)