Chrysler PT Cruiser. Manual — part 988
EVAP/PURGE SOLENOID
DESCRIPTION
OPERATION
All vehicles use a proportional purge solenoid (Fig.
2). The solenoid regulates the rate of vapor flow from
the EVAP canister to the throttle body. The PCM
operates the solenoid.
During the cold start warm-up period and the hot
start time delay, the PCM does not energize the sole-
noid. When de-energized, no vapors are purged.
The proportional purge solenoid operates at a fre-
quency of 200 hz and is controlled by an engine con-
troller 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.
Fig. 1 ORVR System Schematic (PZEV)
1 - FUEL TANK (PLASTIC)
11 - NATURAL VACUUM LEAD DETECTION (NVLD)
2 - FUEL FILLER TUBE
12 - LIQUID SEPARATOR (IF EQUIPPED)
3 - FUEL CAP (PRESSURE/RELIEF)
13 - ENGINE WIRING HARNESS TO NVLD
4 - FILL TUBE TO FUEL TANK CONNECTOR (ELASTOMERIC)
14 - VAPOR CANISTER
5 - TANK VENT/ROLLOVER VALVE(S)
15 - PURGE LINE
6 - VAPOR RECIRCULATION LINE
16 - PURGE DEVICE
7 - TANK VAPOR LINE
17 - WITHOUT NVLD
8 - VAPOR LINE TO CANISTER
18 - BREATHER ELEMENT
9 - CHECK VALVE (N/C)
19 - FLOW CONTROL ORIFICE
10 - CONTROL VALVE
20 - SERVICE PORT
21 - WITH NVLD
25 - 12
EVAPORATIVE EMISSIONS
PT
EVAPORATIVE EMISSIONS (Continued)
REMOVAL
REMOVAL
(1) Remove the negative battery cable.
(2) Remove solenoid from bracket by pulling up on
solenoid.
(3) Disconnect electrical connector from solenoid.
(4) Disconnect vacuum tubes from solenoid.
REMOVAL - 2.4L TURBO
(1) Disconnect the negative battery cable.
(2) Remove solenoid from mounting bracket by
pressing tab and pulling of the solenoid from bracket
(Fig. 3).
(3) Unlock and disconnect the electrical connector
from the purge solenoid (Fig. 4).
(4) Remove the 2 vacuum lines (Fig. 4).
(5) Remove solenoid.
INSTALLATION
INSTALLATION
The top of the solenoid has TOP printed on it. The
solenoid will not operate unless it is installed cor-
rectly.
(1) Connect vacuum tube to solenoid.
(2) Connect electrical connector to solenoid.
(3) Install solenoid on bracket.
(4) Install the negative battery cable.
INSTALLATION - 2.4L TURBO
(1) Install the 2 vacuum lines (Fig. 4).
(2) Connect and lock the electrical connector to the
purge solenoid (Fig. 4).
(3) Install
solenoid
to
the
mounting
bracket
(Fig. 3).
(4) Connect the negative battery cable.
Fig. 2 Proportional Purge Solenoid
1 - EVAP PURGE SOLENOID
2 - POWER STEERING SWITCH
Fig. 3 EVAP PURGE SOLENOID LOCATION - 2.4L
TURBO
Fig. 4 EVAP PURGE SOLENOID - 2.4L TURBO
1 - Electrical Connector
2 - Vacuum Lines
PT
EVAPORATIVE EMISSIONS
25 - 13
EVAP/PURGE SOLENOID (Continued)
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 conditions. 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.
NATURAL VAC LEAK
DETECTION ASSY
REMOVAL
(1) Release fuel pressure, Refer to Fuel System
Pressure Release Procedure in the Fuel Delivery sec-
tion.
(2) Remove the air cleaner lid, disconnect the inlet
air temperature sensor and makeup air hose.
(3) Remove the negative battery cable.
(4) Raise vehicle and support.
(5) Drain fuel tank, refer to Draining Fuel Tank in
the Fuel Delivery section.
(6) Remove fuel tank and EVAP system (Fig. 6),
refer to the Fuel Tank removal/installation section in
the Fuel Delivery section (Fig. 5).
(7) Remove hoses from NVLD assembly.
(8) Remove the bolts from the NVLD Assembly.
INSTALLATION
(1) Install NVLD assembly to the bracket.
(2) Install assembly to the fuel tank.
(3) Install hoses and lines.
(4) Install the fuel tank and EVAP system, refer to
the Fuel Tank removal/installation section in the
Fuel Delivery section.
(5) Lower vehicle.
(6) Install the negative battery cable.
(7) Install the air cleaner lid, connect the inlet air
temperature sensor and makeup air hose.
(8) Fill fuel tank. Use the DRBIII
t scan tool to
pressurize the fuel system. Check for leaks.
Fig. 5 Fuel Tank Assembly
1 - CONTROL VALVE
2 - FUEL PUMP
3 - FLOW MANAGEMENT VALVE
4 - EVAP CANISTOR
5 - NATURAL VACUUM LEAK DETECTION VALVE
6 - FILTER
Fig. 6 EVAP System
1 - NVLD
2 - FUEL TANK
25 - 14
EVAPORATIVE EMISSIONS
PT
ORVR
DESCRIPTION
Onboard Refueling Vapor Recovery (ORVR) System
Schematic and components (Fig. 7).
OPERATION
The emission control principle used in the ORVR
system is that the fuel flowing into the filler tube
(approx. 1” I.D.) creates an aspiration effect which
draws air into the fill tube. During refueling, the fuel
tank is vented to the vapor canister to capture escap-
ing vapors. With air flowing into the filler tube, there
are no fuel vapors escaping to the atmosphere. Once
the refueling vapors are captured by the canister, the
vehicle’s computer controlled purge system draws
vapor out of the canister for the engine to burn. The
vapors flow is metered by the purge solenoid so that
there is no or minimal impact on driveability or
tailpipe emissions.
As fuel starts to flow through the fill tube, it opens
the normally closed check valve and enters the fuel
tank. Vapor or air is expelled from the tank through
the control valve to the vapor canister. Vapor is
absorbed in the canister until vapor flow in the lines
stops, either following shut-off or by having the fuel
level in the tank rise high enough to close the control
valve. The control valve contains a float that rises to
seal the large diameter vent path to the canister. At
this point in the fueling of the vehicle, the tank pres-
sure increase, the check valve closes (preventing tank
fuel from spiting back at the operator), and fuel then
Fig. 7 ORVR System Schematic
1 - FUEL TANK (PLASTIC)
11 - NATURAL VACUUM LEAD DETECTION (NVLD)
2 - FUEL FILLER TUBE
12 - LIQUID SEPARATOR (IF EQUIPPED)
3 - FUEL CAP (PRESSURE/RELIEF)
13 - ENGINE WIRING HARNESS TO NVLD
4 - FILL TUBE TO FUEL TANK CONNECTOR (ELASTOMERIC)
14 - VAPOR CANISTER
5 - TANK VENT/ROLLOVER VALVE(S)
15 - PURGE LINE
6 - VAPOR RECIRCULATION LINE
16 - PURGE DEVICE
7 - TANK VAPOR LINE
17 - WITHOUT NVLD
8 - VAPOR LINE TO CANISTER
18 - BREATHER ELEMENT
9 - CHECK VALVE (N/C)
19 - FLOW CONTROL ORIFICE
10 - CONTROL VALVE
20 - SERVICE PORT
21 - WITH NVLD
PT
EVAPORATIVE EMISSIONS
25 - 15
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