2002 JEEP GRAND CHEROKEE Leak detection pump

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual and deteriorate engine performance, driveability and
fuel economy.
The catalyst monitor uses dual oxygen sensors
(O2Ss) to monitor the efficiency of the converter. The
dual O2Ss sensor strategy is b

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual Non-emissions related failures have no priority.
One trip failures of two trip faults have low priority.
Two trip failures or matured faults have higher pri-
ority. One and two trip failures of fuel s

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual EVAPORATIVE EMISSIONS
TABLE OF CONTENTS
page page
EVAPORATIVE EMISSIONS
DESCRIPTION
DESCRIPTION - EVAPORATION CONTROL
SYSTEM............................24
DESCRIPTION - CCV SYSTEM...........25
DESCRIP

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual NOTE: The evaporative system uses specially man-
ufactured lines/hoses. If replacement becomes nec-
essary, only use fuel resistant, low permeation
hose.
Certain components can be found in (Fig. 1).
D

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual INSTALLATION - FIXED ORIFICE FITTING
When installing fixed orifice fitting, be sure loca-
tions of fixed orifice fitting and air inlet fitting (Fig.
9) have not been inadvertently exchanged. The fixed

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual CAUTION: Remove the fuel tank filler tube cap to
relieve fuel tank pressure. The cap must be
removed prior to disconnecting any fuel system
component or before draining the fuel tank.
LEAK DETECTION P

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual OPERATION
The main purpose of the LDP is to pressurize the
fuel system for leak checking. It closes the EVAP sys-
tem vent to atmospheric pressure so the system can
be pressurized for leak testing. Th

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JEEP GRAND CHEROKEE 2002 WJ / 2.G Workshop Manual change from opened to closed. If the reed switch
changes too quickly, a leak may be indicated. The
longer it takes the reed switch to change state, the
tighter the evaporative system is sealed. If the
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