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DI-86
DIAGNOSTICS - ENGINE
DI6VE-02
DTC P0441 Evaporative Emission Control System
Incorrect Purge Flow
DTC P0446 Evaporative Emission Control System Vent
Control Malfunction
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV), VSV for 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.
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components
within the dotted line in Fig. 1 below, or when there is a malfunction in either the VSV for EVAP, the VSV for
pressure switching valve, or in the vapor pressure sensor itself.
Fig. 1
ECM
Vapor Pressure
Sensor
(6) Fuel Tank Over
VSV for
(1) Fill Check Valve
EVAP
(2)
(5)
(10)
(11)
VSV for (8)
(7) CCV (9)
(3)
Charcoal Canister Fuel Tank
A11985
2002 ECHO (RM884U)
Author : Date : 256
DI-87
DIAGNOSTICS - ENGINE
DTC No. DTC Detecting Condition Trouble Area
Pressure in charcoal canister does not drop during purge con-
trol (2 trip detection logic)
P0441
During purge cut-off, pressure in charcoal canister is very low
S Open or short in vapor pressure sensor circuit
compared with atmospheric pressure (2 trip detection logic)
S Vapor pressure sensor
When VSV for pressure switching valve is OFF, ECM judges S Open or short in VSV circuit for EVAP
that there is no continuity between vapor pressure sensor va- S VSV for EVAP
por pressure sensor and charcoal canister (2 trip detection S Open or short in VSV circuit for vapor pressure sensor
logic) S VSV for vapor pressure sensor
va or ressure
When VSV for pressure switching valve is OFF, ECM judges S Charcoal canister cracked, hole or damaged
P0446
that there is no continuity between vapor pressure sensor and S Fuel tank over fill check valve cracked or damaged
fuel tank (2 trip detection logic) S ECM
After purge cut off operates, pressure in charcoal canister is
maintained at atmospheric pressure (2 trip detection logic)
WIRING DIAGRAM
Refer to DTC P0440 on page DI-80 .
INSPECTION PROCEDURE
HINT:
S If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440,first troubleshoot DTC P0441,
P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next.
S Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected. When troubleshooting, it is useful for
determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel
ratio was lean or rich, etc. at the time of the malfunction.
S When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.
TOYOTA hand-held tester:
1 Check whether hose close to fuel tank have been modified, and check whether
there are signs of any accident near fuel tank or charcoal canister (See page
DI-80 ).
NG Repair or replace.
OK
2 Check that fuel tank cap is TOYOTA genuine parts.
NG Replace to TOYOTA genuine parts.
OK
2002 ECHO (RM884U)
Author : Date : 257
DI-88
DIAGNOSTICS - ENGINE
3 Check that fuel tank cap is correctly installed.
NG Correctly install fuel tank cap.
OK
4 Check fuel tank cap (See page EC-5 ).
NG Replace fuel tank cap.
OK
5 Check filler neck for damage.
NG Replace filler pipe.
OK
6 Check vacuum hoses between vapor pressure sensor and fuel tank, and char-
coal canister and VSV for pressure switching valve and VSV for pressure switch-
ing valve and charcoal canister (See page DI-80 ).
NG Repair or connect VSV or sensor connector.
OK
7 Check hose and tube between fuel tank and charcoal canister (See page
DI-80 ).
NG Repair or replace.
OK
2002 ECHO (RM884U)
Author : Date : 258
DI-89
DIAGNOSTICS - ENGINE
8 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
9 Check vacuum hoses ((8), (9), (10) and (11) 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.
OK
10 Check voltage between terminals VC and E2 of ECM connector (See page
DI-80 ).
NG Check and replace ECM (See page IN-29 ).
OK
11 Check voltage between terminals PTNK and E2 of ECM connectors (See page
DI-80 ).
OK Go to step 13.
NG
2002 ECHO (RM884U)
Author : Date : 259
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DIAGNOSTICS - ENGINE
12 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
13 Check purge flow.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Select the ACTIVE TEST mode on the TOYOTA hand-
held tester.
(c) Disconnect the vacuum hose from the VSV for the EVAP
from the charcoal canister.
(d) Start the engine.
CHECK:
To Throttle Body
A09108 When the VSV for the EVAP is operated by the TOYOTA hand-
held tester, check whether the disconnected hose applies suc-
tion 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 16.
NG
2002 ECHO (RM884U)
Author : Date : 260
DI-91
DIAGNOSTICS - ENGINE
14 Check vacuum hose between intake manifold and VSV for EVAP, and VSV for
EVAP 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.
OK
15 Check operation of VSV for EVAP (See page SF-50 ).
OK Go to step 16.
NG
Replace VSV and charcoal canister,and then clean the vacuum hose between throttle body and
VSV for EVAP, and VSV for EVAP and charcoal canister.
16 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for EVAP, and VSV for EVAP and ECM (See page
IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 261
DI-92
DIAGNOSTICS - ENGINE
17 Check VSV for CCV.
PREPARATION:
ON
(a) Connect the TOYOTA hand-held tester to the DLC3.
Air Air
(b) Diconnect the vacuum hose for the VSV for the CCV from
E E the charcoal canister.
(c) Turn the ignition switch ON and push the TOYOTA hand-
held tester main switch ON.
F F (d) Select the ACTIVE TEST mode on the TOYOTA hand-
VSV is OFF held tester.
BE6653
VSV is ON
B09579 A09131 CHECK:
Check the VSV operation when it is operated by the TOYOTA
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 21.
NG
18 Check vacuum hose between VSV for 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.
OK
19 Check operation of VSV for CCV.
OK Go to step 20.
NG
2002 ECHO (RM884U)
Author : Date : 262
DI-93
DIAGNOSTICS - ENGINE
Replace VSV and charcoal canister, and then clean vacuum hose between charcoal canister and
VSV for CCV.
20 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for CCV, and VSV for CCV and ECM (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
21 Check fuel tank.
START PREPARATION:
(a) Remove the connector cover from the ECM.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-
ON
VSV for EVAP held tester.
OFF
(d) Start the engine.
ON (e) The VSV for the CCV is ON by the TOYOTA hand-held
VSV for CCV
OFF tester.
30 sec. Measure
Voltage (f) The VSV for the EVAP is OFF, and the VSV for the pres-
sure switching valve is ON by the TOYOTA hand-held
PTNK E2
tester and remains on for 30 sec.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors after switching the VSV for the EVAP from
OFF to ON, and the VSV for the pressure switching valve from
ON to OFF.
(+) (-) OK:
Voltage: 2.5 V or less
BE6653
A10620
A09107 A09113
NG Replace fuel tank.
OK
2002 ECHO (RM884U)
Author : Date : 263
DI-94
DIAGNOSTICS - ENGINE
22 Check charcoal canister.
START PREPARATION:
(a) Remove the connector cover from the ECM.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-
ON
VSV for EVAP held tester.
OFF
(d) Start the engine.
ON (e) The VSV for the CCV and the VSV for the pressure
VSV for CCV
OFF switching valve are ON by the TOYOTA hand-held tester.
30 sec. Measure
Voltage (f) The VSV for the EVAP is OFF by the TOYOTA hand-held
tester and remains on for 30 sec.
PTNK E2
CHECK:
Measure the voltage between terminals PTNK and E2 of the
ECM connectors after switching the VSV for the EVAP from
OFF to ON.
OK:
Voltage: 2.5 V or less
(+) (-)
NG Replace charcoal canister.
BE6653
A10620
A09107 A09113
OK
23 Remove chacoal canister and check it (See page EC-5 ).
NG Replace charcoal canister.
OK
24 Check fuel tank over fill check valve (See page EC-5 ).
NG Replace fuel tank over fill check valve or fuel
tank.
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 264
DI-95
DIAGNOSTICS - ENGINE
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check whether hose close to fuel tank have been modified, and check whether
there are signs of any accident near fuel tank or charcoal canister (See page
DI-80 ).
NG Repair or replace.
OK
2 Check that fuel tank cap is TOYOTA genuine parts.
NG Replace to TOYOTA genuine parts.
OK
3 Check that fuel tank cap is correctly installed.
NG Correctly install fuel tank cap.
OK
4 Check fuel tank cap (See page EC-5 ).
NG Replace fuel tank cap.
OK
2002 ECHO (RM884U)
Author : Date : 265
DI-96
DIAGNOSTICS - ENGINE
5 Check filler neck for damage.
NG Replace filler pipe.
OK
6 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
7 Check vacuum hoses ((8), (9) , (10) and (11) 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 hoses.
OK
8 Check voltage between terminals VC and E2 of ECM connector (See page
DI-80 ).
NG Check and replace ECM (See page IN-29 ).
OK
2002 ECHO (RM884U)
Author : Date : 266
DI-97
DIAGNOSTICS - ENGINE
9 Check voltage between terminals PTNK and E2 of ECM connectors (See page
DI-80 ).
OK Go to step 11.
NG
10 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
11 Check VSV for EVAP.
PREPARATION:
ON
(a) Remove the connector cover from the ECM.
(b) Turn the ignition switch ON.
CHECK:
Check VSV function.
(1) Connect between terminal EVP1 of the ECM con-
nector and body ground (VSV ON).
(2) Disconnect between terminal EVP1 of the ECM
VSV is OFF
connector and body ground (VSV OFF).
OK:
VSV is ON (1) VSV is ON:
Air from port E fows out through port F.
(2) VSV is OFF:
Air does not flow from port E to port F.
E E
BE6653 F F OK Go to step 14.
A09109 VSV is OFF VSV is ONA09132
B09574
NG
2002 ECHO (RM884U)
Author : Date : 267
DI-98
DIAGNOSTICS - ENGINE
12 Check operation of VSV for EVAP (See page SF-50 ).
NG Go to step 13.
NG
Replace VSV and clean vacuum hoses between throttle body and VSV for EVAP, and VSV for
EVAP and charcoal canister, and then check charcoal canister.
13 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for EVAP, and VSV for EVAP and ECM (See page
IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
2002 ECHO (RM884U)
Author : Date : 268
DI-99
DIAGNOSTICS - ENGINE
14 Check VSV for CCV.
PREPARATION:
ON
(a) Remove the connector cover from the ECM.
(b) Turn the ignition switch ON.
CHECK:
Check the VSV function.
(1) Connect between terminal CCV of the ECM con-
nector and body ground (VSV ON).
(2) Disconnect between terminal CCV of the ECM con-
VSV is OFF nector and body ground (VSV OFF).
VSV is ON
OK:
VSV is ON:
Air Air Air does not flow from port E to port F.
E E
VSV is OFF:
Air from port E flows out through port F.
F F
VSV is ON VSV is OFF
BE6653
A09110
B09579 A12095
OK Go to step 17.
NG
15 Check operation of VSV for CCV (See page SF-52 ).
OK Go to step 16.
NG
Replace VSV and charcoal canister, and then clean vacuum hoses between charcoal canister
and VSV for CCV.
2002 ECHO (RM884U)
Author : Date : 269
DI-100
DIAGNOSTICS - ENGINE
16 Check for open and short in harness and connector between EFI main relay
(Marking: EFI) and VSV for CCV, and VSV for CCV and ECM (See page IN-29 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-29 ).
17 Check fuel tank over fill check valve (See page EC-5 ).
NG Replace fuel tank over fill check valve or fuel
tank.
OK
Check and replace charcoal canister (See
page EC-5 ).
2002 ECHO (RM884U)
Author : Date : 270
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