Page 1273 of 3115

DI-224
- DIAGNOSTICSENGINE
417 Author: Date:
MONITOR DESCRIPTION
P0441
The ECM checks for a stuck closed malfunction in the EVAP VSV by commanding it to open with the CCV
closed. If a high negative pressure does not develop in the fuel tank, the ECM determines that the EVAP
VSV remains closed. The ECM turns on the MIL and a DTC is set.
The ECM checks for EVAP VSV ºstuck openº fault by commanding both valves (EVAP VSV and CCV) to
close at a time when the fuel tank is at atmospheric pressure. If the fuel tank develops a high negative pres-
sure at this early stage of the test, the ECM determines that the EVAP VSV is stuck OPEN.
The ECM will turn on the MIL and a DTC is set.
P0446
The ECM checks the CCV ºstuck closedº by commanding the CCV to open after the EVAP leak test. If the
fuel tank pressure does not rise (lose vacuum), the ECM determines that the CCV is stuck closed. The ECM
will turn on the MIL and a DTC is set.
If the EVAP VSV ºstuck closedº is detected, the ECM determines that the CCV is ºstuck openº. The ECM
turns on the MIL and a DTC is set.
P2418
The ECM checks the pressure switching valve (bypass VSV) ºstuck openº by commanding the pressure
switching valve to close after the EVAP leak test. If the fuel tank pressure does not change, the ECM deter-
mines that the pressure switching valve is malfunctioning. The ECM will turn on the MIL and a DTC is set.
If the EVAP VSV ºstuck closedº is detected, the ECM determines that the CCV is ºstuck closedº. The ECM
turns on the MIL and a DTC is set.
Page 1274 of 3115

- DIAGNOSTICSENGINE
DI-225
418 Author: Date:
MONITOR STRATEGY
P0441EVAP VSV malfunction
Related DTCsP0446CCV malfunctionRelated DTCs
P2418Bypass VSV malfunction
Required sensors/componentsEVAP VSV, CCV, Bypass VSV and Vapor pressure sensor
Frequency of operationOnce per drive cycle
Duration
P0441 : 90 sec.
P0446 : 10 sec.
P2418 : 10 sec.
MIL operation2 drive cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
Same as P0442 (see page DI-245).
TYPICAL MALFUNCTION THRESHOLDS
P0441
Detection CriteriaThreshold
Either the following condition is met:A or B
A. Following conditions are met:(a) and (b)
(a) Fuel tank pressure at the vacuum introduction start-1.6 kPa (-12 mmHg, -0.47 in.Hg) or more
(b) Difference between the fuel tank pressure at the vacuum
introduction start and completionLess than 0.9 kPa (7 mmHg, 0.27 in.Hg)
B. Following conditions are met:(a) and (b)
(a) Difference between ºminimumº fuel tank pressure before
the leak check and the fuel tank pressure at 14 sec. after
the leak check
0.5 kPa or more (3.5 mmHg, 0.15 in.Hg)
(b) Fuel tank pressure at 14 sec. after the leak checkLess than -3.7 kPa (-28 mmHg, -1.1 in.Hg)
P0446
Case 1: CCV stuck closed
Fuel tank pressure when the CCV is opened after an EVAP
leak checkNot changing
Case 2: CCV stuck open
Fuel tank pressure after the EVAP VSV is opened and man-
ifold vacuum is introduced to the fuel tankNot changing
P2418
Case 1: Bypass VSV stuck open
Fuel tank pressure when the pressure switching valve is
closed after an EVAP leak checkNot changing
Case 2: Bypass VSV stuck closed
Fuel tank pressure after the EVAP VSV is opened and man-
ifold vacuum is introduced to the fuel tankNot changing
Page 1275 of 3115

DI-226
- DIAGNOSTICSENGINE
419 Author: Date:
MONITOR RESULT
The detailed information is described in CHECKING MONITOR STATUSº (see page DI-3).
TID (Test Identification) is assigned to each emission-related component.
TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
CID (Component Identification) is assigned to each test value.
Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.
TID $02: EVAP - Vacuum Monitor
TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
1$01Multiply by 0.0916
(mmHg)Test value of EVAP VSV:
Determined by fuel tank pressure change during vacuum introductionMalfunction criterion
1$02Multiply by 0.0458 and
subtract 2.93 (mmHg)Test value of bypass VSV (pressure switching valve):
Determined by fuel tank pressure change at switching over bypass
VSV
Malfunction criterion
0$03Multiply by 0.0458
(mmHg)Test value of 0.04 inch leak:
Determined by fuel tank pressure changeMalfunction criterion
0$04Multiply by 0.0458
(mmHg)Test value of 0.02 inch leak:
Determined by fuel tank pressure changeMalfunction criterion
1$05Multiply by 0.0458 and
subtract 2.93 (mmHg)Test value of CCV:
Determined by fuel tank pressure change at switching over CCVMalfunction criterion
Page 1276 of 3115
A19970A20087
V1 Vapor Pressure Sensor
Cowl Side J/B LH
Engine Room R/B
Engine Room J/B
F15 FL BlockECM
J/B No. 5
MAIN
BatteryEFI or
ECD No. 2
EFI or ECD RelayJ/B No. 6 J/B No. 5
V4
VSV (EVAP)
MREL CCV
PRG TBP PTNK E2VC
V10 VSV (Pressure
Switching Valve)
VCC
GND
PTNK4
BB1 ID4 Id1 IN2 If1
BB1 ID4 Id1 IN2 If1
BB1 ID4
BD3 BD3 ID4
IX2E5
E5
E5
E5 E9
E9
2A
2K2B 2Q
11
1 11B
1B1A
1CE9
5D5C 6C 6D 5D 5C L-R
3
1
2
BR-W
L-BBR-WL-R L-R L-R L-R L-R
L-B L-BBR BR BR-W BR-W
B-Y L-R L-R L-RLL L B-Y B-Y
SB
SB
B-Y
B-YB-Y B-Y L-B
B-W B-W
B-Y
B-W W-B W-B
B-G
2
EA 7
3
111
14
121
23
13418
28
21
4
27
34 12
1 2 11078 9
45
10
165
15
28
44 43
11 1EFI or ECD No. 1 1221 13
1
2 3
4
B-YL-R
If1 14
V9 VSV (Canister
Closed Valve)
- DIAGNOSTICSENGINE
DI-227
420 Author: Date:
WIRING DIAGRAM
Page 1277 of 3115

DI-228
- DIAGNOSTICSENGINE
421 Author: Date:
INSPECTION PROCEDURE
HINT:
If DTC P0441 (Purge Flow), P0446 (CCV) or P2418 (Pressure switching valve) or P0451 (Evaporative
Pressure Sensor) is output with DTC P0442, P0455 or P0456, first troubleshoot DTC P0441, P0446
or P0451. If no malfunction is detected, troubleshoot DTC P0442, P0455 or P0456 next.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can
help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel
ratio was lean or rich, and other data from the time the malfunction occurred.
When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
vapor pressure sensor.
Hand-held tester:
1 Check that fuel tank cap meets OEM specifications.
NG Replace with a cap that meets OEM specifica-
tions.
OK
2 Check that fuel tank cap is correctly installed.
NG Correctly install fuel tank cap.
OK
3 Check fuel tank cap (See page EC-5).
NG Replace fuel tank cap.
OK
Page 1278 of 3115
A19812
VSV is ON
VSV is OFF
- DIAGNOSTICSENGINE
DI-229
422 Author: Date:
4 Check filler neck for damage.
PREPARATION:
Remove the fuel tank cap.
CHECK:
Visually inspect the filler neck for damage.
NG Replace filler pipe.
OK
5 Check purge flow.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Select the ºENHANCED OBD II / ACTIVE TESTº mode on
the hand-held tester.
(c) Disconnect the vacuum hose for the EVAP VSV from the
charcoal canister.
(d) Start the engine.
(e) Select the item ºEVAP (ALON) / ALLº in the ACTIVE TEST
and operate EVAP VSV.
CHECK:
When the EVAP VSV is operated by the hand-held tester,
check whether the disconnected hose applies suction to your
finger.
OK:
VSV is ON:
Disconnected hose applies suction to your finger.
VSV is OFF:
Disconnected hose applies no suction to your finger.
OK Go to step 9.
NG
Page 1279 of 3115
DI-230
- DIAGNOSTICSENGINE
423 Author: Date:
6 Check vacuum hose between intake manifold and EVAP VSV, and EVAP VSV and
charcoal canister.
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.
(c) Check the vacuum hose for cracks, hole, damage and blockage.
NG Repair or replace vacuum hose.
OK
7 Check operation of EVAP VSV (See page SF-44).
NG Replace EVAP VSV.
OK
8 Check for open and short in harness and connector between EFI or ECD relay
and EVAP VSV, and EVAP VSV and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
Page 1280 of 3115

A10150A10149BE6653
A10281VSV is OFFVSV is ON ON
Air
FAir
E
F E
- DIAGNOSTICSENGINE
DI-231
424 Author: Date:
9 Check CCV.
PREPARATION:
(a) Disconnect the vacuum hose for the CCV VSV from the
charcoal canister.
(b) Turn the ignition switch ON and push the hand-held tes-
ter main switch ON.
(c) Select the ºENHANCED OBD II / ACTIVE TESTº mode on
the hand-held tester.
(d) Select the item ºCAN CTRL VSV / ALLº in the ACTIVE
TEST and operate CCV.
CHECK:
Check the VSV operation when it is operated by the hand-held
tester.
OK:
VSV is ON:
Air does not flow from port E to port F.
VSV is OFF:
Air from port E flows out through port F.
OK Go to step 13.
NG
10 Check vacuum hose between CCV and charcoal canister.
CHECK:
(a) Check that the vacuum hose is connected correctly.
(b) Check the vacuum hose for looseness and disconnection.
(c) Check the vacuum hose for cracks, hole damage, and blockage.
NG Repair or replace vacuum hose.
OK
11 Check operation of CCV (See page SF-48).
NG Replace CCV.
OK