Evaporative (Evap) Emissions Canister Purge Valve Solenoid Check - Isuzu 1999 RODEO Workshop Manual

6E1–102 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
EVAPORATIVE (EVAP) EMISSIONS CANISTER PURGE VALVE SOLENOID
Circuit Description
Canister purge is controlled by a solenoid valve that
allows manifold vacuum to purge the canister. The
powertrain control module (PCM) supplies a ground to
energize the solenoid valve (purge ON). The EVAP purge
solenoid control is turned ON time is determined by
engine operating conditions including load, throttle
position, coolant temperature and ambient temperature.
The duty cycle is calculated by the PCM and the purge
solenoid is enabled when the appropriate conditions have
been met:
f The engine run time after start is more than 60
seconds.
f The engine coolant temperature is above 30°C
(86°F).
f The fuel control system is operating in the
Closed–Loop mode.
CHECK
Diagnostic Aids
f Make a visual check of vacuum hoses.
f Check the throttle body for possible cracked.
f Check the malfunction indicator lamp for a possible
mechanical problem.
Test Description
The number(s) below refer to the step number(s) on the
Diagnostic Chart:
1. Check to see if the solenoid is open or closed. The
solenoid is normally de–energized in this step, so it
should be closed.
2. This step checks to determine if the solenoid was
open due to an electrical circuit problem or a
defective solenoid.
3. This should normally energize the solenoid, opening
the valve and allowing the vacuum to drop (purge
ON).
D06RX056