EVAP/PURGE SOLENOID
DESCRIPTION
All vehicles use a proportional purge solenoid. The
solenoid regulates the rate of vapor flow from the
EVAP canister to the throttle body. The PCM oper-
ates the solenoid.
OPERATION
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 (Fig. 2) 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
The solenoid attaches to a bracket near the air
cleaner. The solenoid will not operate unless it is
installed correctly.
(1) Disconnect electrical connector from solenoid.
(2) Disconnect vacuum tubes from solenoid.
(3) Remove solenoid from bracket.
INSTALLATION
The solenoid attaches to a bracket near the air
cleaner. The solenoid will not operate unless it is
installed correctly.
The top of the solenoid has TOP printed on it. The
solenoid will not operate unless it is installed cor-
rectly.
(1) Install solenoid on bracket.
(2) Connect vacuum tube to solenoid.
(3) Connect electrical connector to solenoid.
Fig. 1 ORVR SYSTEM SCHEMATIC
1 - FUEL CAP
2 - RECIRCULATION TUBE
3 - CONTROL VALVE
4 - FLOW MANAGEMENT VALVE
5 - PURGE
6 - NVLD ASSMBLY
7 - BREATHER ELEMENT
8 - CANISTER
9 - ROLLOVER VALVE
10 - FUEL TANK
11 - CHECK VALVE
25 - 12 EVAPORATIVE EMISSIONS LH
EVAPORATIVE EMISSIONS (Continued)
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