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 1282 of 3115
A10193
A20058
- DIAGNOSTICSENGINE
DI-233
426 Author: Date:
15 Check for open and short in harness and connector between EFI or ECD relay
and pressure switching valve, and pressure switching valve and ECM (See page
IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
16 Check whether hose close to fuel tank has been modified, and check whether
there are signs of any accident near fuel tank.
CHECK:
Check for cracks, deformation and loose connection of the fol-
lowing parts:
Fuel tank
Fuel tank filler pipe
Hoses and tubes around fuel tank
NG Repair or replace evaporative emission leak
part.
OK
17 Check vacuum hoses between vapor pressure sensor and fuel tank, and char-
coal canister and pressure switching valve.
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 and damage.
NG Repair or replace vacuum hose.
OK
Page 1284 of 3115
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
- DIAGNOSTICSENGINE
DI-235
428 Author: Date:
20 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors at following condition (1) and (2).
(1) Disconnect the vacuum hose from the vapor pres-
sure sensor.
(2) Using the MITYVAC (Hand-Held Vacuum Pump),
apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg)
to the vapor pressure sensor.
NOTICE:
The vacuum applied to the vapor pressure sensor must be
less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:
Condition (1) Voltage: 2.9 to 3.7 V
Condition (2) Voltage: 0.5 V or less
OK Go to step 22.
NG
21 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-36).
NG Repair or replace harness or connector.
OK
Replace ECM (See page SF-60).
22 Check fuel tank inlet valve.
NG Replace fuel tank inlet valve.
OK
Page 1287 of 3115
A10193
A20058
DI-238
- DIAGNOSTICSENGINE
431 Author: Date:
5 Check whether hose close to fuel tank has been modified, and check whether
there are signs of any accident near fuel tank or charcoal canister.
CHECK:
Check for cracks, deformation and loose connection of the fol-
lowing parts:
Fuel tank
Charcoal canister
Fuel tank filler pipe
Hoses and tubes around fuel tank and charcoal
canister
NG Repair or replace evaporative emissions leak
part.
OK
6 Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal
canister and pressure switching valve.
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 and damage.
NG Repair or replace vacuum hose.
OK
7 Check hose and tube between fuel tank and charcoal canister.
CHECK:
(a) Check for proper connection of the fuel tank and fuel evap pipe (See page EC-2), fuel evap pipe and
fuel tube under the floor, fuel tube under the floor and charcoal canister.
(b) Check the hose and tube for cracks, hole and damage.
NG Repair or replace hose and tube.
OK
Page 1288 of 3115
- DIAGNOSTICSENGINE
DI-239
432 Author: Date:
8 Check vacuum hoses ((8) and (9) in Fig. 1 in circuit description).
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
9 Check VSV connector for EVAP, VSV connector for CCV, VSV connector for pres-
sure switching valve and vapor pressure sensor connector for looseness and
disconnection.
NG Repair or connect VSV or sensor connector.
OK
10 Check charcoal canister for cracks, hole and damage.
NG Replace charcoal canister.
OK
Page 1289 of 3115
A19522A19630
VC
E2(+)
(-) E5
ECM Connector
A19627A19432
A19637
E2PTNK
Vacuum Disconnect(+)
(-) E5
E9
DI-240
- DIAGNOSTICSENGINE
433 Author: Date:
11 Check voltage between terminals VC and E2 of ECM connector.
CHECK:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals the E5 ECM connector.
OK:
Tester ConnectionSpecified Condition
VC (E5-18) - E2 (E5-28)4.5 to 5.5 V
NG Replace ECM (See page SF-60).
OK
12 Check voltage between terminals PTNK and E2 of ECM connectors.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors at following condition (1) and (2).
(1) Disconnect the vacuum hose from the vapor pres-
sure sensor.
(2) Using the MITYVAC (Hand-Held Vacuum Pump),
apply a vacuum of 4.0 kPa (30 mmHg, 1.18 in.Hg)
to the vapor pressure sensor.
NOTICE:
The vacuum applied to the vapor pressure sensor must be
less than 66.7 kPa (500 mmHg, 19.7 in.Hg).
OK:
Condition (1) Voltage: 2.9 to 3.7 V
Condition (2) Voltage: 0.5 V or less
OK Go to step 14.
NG
Page 1294 of 3115
A19378A20057
ECM
EVAP VSV
Charcoal Canister
Fuel Tank Fig. 1
(2)
(3) (4) (6)
(8)
(9) (1)
(5)
(7)Vapor Pressure
Sensor
CCVPressure
Switching
Valve
- DIAGNOSTICSENGINE
DI-245
438 Author: Date:
DTC P0442 Evaporative Emission Control System Leak
Detected (Small Leak)
DTC P0455 Evaporative Emission Control System Leak
Detected (Gross Leak)
DTC P0456 Evaporative Emission Control System Leak
Detected (Very Small Leak)
CIRCUIT DESCRIPTION
The vapor pressure sensor, canister closed valve (CCV) and pressure switching valve are used to detect
abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0442, P0455 or P0456 is recorded by the ECM when evaporative emissions leak from the compo-
nents within the dotted line in Fig. 1 below, or when the vapor pressure sensor malfunctions.
DIC2I-01
