Dodge Caliber. Manual — part 1443
EVAP/PURGE SOLENOID
DESCRIPTION
All vehicles use a proportional purge solenoid (1). The
solenoid regulates the rate of vapor flow from the
EVAP canister to the intake manifold. The PCM oper-
ates the solenoid.
OPERATION
All vehicles use a proportional purge solenoid. The solenoid regulates the rate of vapor flow from the EVAP canister
to the intake manifold. The PCM operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When
de-energized, no vapors are purged.
The proportional purge solenoid operates at a frequency of 200 hz and is controlled by an engine controller circuit
that senses the current being applied to the proportional purge solenoid and then adjusts that current to achieve the
desired purge flow. The proportional purge solenoid controls the purge rate of fuel vapors from the vapor canister
and fuel tank to the engine intake manifold.
REMOVAL
1. Remove air inlet resonator assembly.
2. Remove the air cleaner box.
3. Disconnect negative battery cable.
4. Unlock and disconnect electrical connector from
solenoid (1).
5. Disconnect vacuum tubes from solenoid (2).
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EVAPORATIVE EMISSIONS
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6. Remove solenoid (1) from bracket by depressing
clip and pulling solenoid from bracket.
INSTALLATION
The top of the solenoid has TOP printed on it. The solenoid will not operate unless it is installed correctly.
1. Connect vacuum tube to solenoid (2).
2. Connect electrical connector to solenoid and lock
(1).
3. Install solenoid on bracket.
4. Install the negative battery cable.
5. Install air cleaner box.
6. Install resonator assembly.
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EVAPORATIVE EMISSIONS
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FUEL FILLER CAP
DESCRIPTION
The plastic fuel fill cap is threaded/quarter turn onto the end of the fuel filler tube. It’s purpose is to retain vapors
and fuel in the fuel tank.
OPERATION
The fuel filler cap incorporates a two-way relief valve that is closed to atmosphere during normal operating condi-
tions. The relief valve is calibrated to open when a pressure of 17 kPa (2.5 psi) or vacuum of 2 kPa (0.6 in. Hg)
occurs in the fuel tank. When the pressure or vacuum is relieved, the valve returns to the normally closed position.
CAUTION: Remove the fuel filler cap to release fuel tank pressure before disconnecting any fuel system
component.
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EVAPORATIVE EMISSIONS
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PCV VALVE
DESCRIPTION
It threads into the valve cover.
OPERATION
When the engine is not operating or during an engine backfire, the spring forces the plunger back against the seat.
This prevents vapors from flowing through the valve.
When the engine is at idle or cruising, high manifold
vacuum is present. At these times manifold vacuum is
able to completely compress the spring and pull the
plunger to the top of the valve. In this position there is
minimal vapor flow through the valve.
During periods of moderate intake manifold vacuum
the plunger is only pulled part way back from the inlet.
This results in maximum vapor flow through the valve.
DIAGNOSIS AND TESTING - PCV
SYSTEM
WARNING:
apply
parking
brake
and/or
block
wheels before performing any test or adjustment
with the engine operating.
1. With engine idling, remove the hose from the PCV valve. If the valve is not plugged, a hissing noise will be heard
as air passes through the valve. A strong vacuum should also be felt when a finger is placed over the valve inlet.
2. Install hose on PCV valve. Remove the make-up air hose from the air plenum at the rear of the engine. Hold a
piece of stiff paper (parts tag) loosely over the end of the make-up air hose.
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EVAPORATIVE EMISSIONS
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