Toyota Corolla 2004 Repair Manual - EMISSION CONTROL SYSTEM
12–6
INSPECTION
–EMISSION CONTROL EMISSION CONTROL SYSTEM
1204E–01
1. CHARCOAL CANISTER ASSY
(a) Visually check the charcoal canister for cracks or dam-
age.
A63966
EVAP Port
Air Drain Port
Air Inlet Port
Air Drain Port
Air Inlet
Port
Air
Purge Port
Air
Purge Port
Vent Port
Cap
A63968
EVAP Port
A63970
(b) Inspect the charcoal canister operation.
(1) Plug the vent port with the cap.
(2) While holding the purge port closed, blow air (1.76
2
kPa, 18 gf/cm
, 0.26 psi) into the EVAP port and
check that air flows from the air drain port.
(3) While holding the purge port and the air drain port
2
closed, blow air (1.76 kPa, 18 gf/cm
, 0.26 psi) into
the EVAP port and check that air does not flow from
the air inlet port.
(4) Apply vaccum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg)
to the purge port, check that the vacuum dose not
decrease when the air inlet port is closed, and
check that the vacuum decreases when the air inlet
port is released.
Vacuum
2004 COROLLA (RM1037U)
Purge Port
A63972
1006Author: Date:
Air Inlet
Port
Vacuum
Purge Port
EVAP Port
12–7
–EMISSION CONTROL EMISSION CONTROL SYSTEM
(5) While holding the air inlet port closed, apply vacuum
(3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EV AP port
and check that air flows into the purge port.
If operation is not as spacified, replace the charcoal canister.
(6) Remove the hose and cap from vent port.
A65903
Ohmmeter
Continuity
Ohmmeter
No Continuity
(c) Inspect VSV for Pressure Swiching Valve
(1) Using an ohmmeter, check that there is continuity
between the terminals.
Resistance: 37 – 44 Ω at 20C (68F)
If there is no continuity, replace the VSV.
A65908
(2) Using an ohmmeter , check that there is no continu-
ity between each terminal and the body.
If there is continuity, replace the VSV.
A65909
(3) Check that air does not flow from ports E to F.
F
E
Air
Battery
2004 COROLLA (RM1037U)
A65910
(4) Apply battery positive voltage across the terminals.
(5) Check that air flows from ports E to F.
If operation is not as specified, replace the VSV.
F
E
Air
A65911
1007Author: Date:
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