Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0440p
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DI-72
DIAGNOSTICS - ENGINE
DI6T6-02
DTC P0440 Evaporative Emission Control System Mal-
function
DTC P0442 Evaporative Emission Control System Leak
Detected (Small Leak)
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and 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.
DTC P0440 or P0442 is recorded by the ECM when evaporative emissions leak from the components within
the dotted line in Fig. 1 below, or when the vapor pressure sensor malfunctions.
Fig. 1
ECM
Vapor Pressure
VSV for
Sensor
Pressure
(6) Switching
VSV for VSV
for EVAP Valve Fuel Tank Over
CCV (1) Fill Check Valve
(5) (4) (2)
(10)
(7)
(8) (11)
(9)
(3)
Charcoal Canister Fuel Tank
A10140
DTC No. DTC Detecting Condition Trouble Area
S Hose or tube cracked, hole, damaged or loose seal ((3) in
Fig. 1)
S Fuel tank cap incorrectly installed
S Fuel tank cap cracked or damaged
S Vacuum hose cracked, holed, blocked, damaged or discon-
After cold starting and when generating certain swift pressure
P0440 nected ((1) or (2) in Fig. 1)
value in fuel tank enabling not to hold that value (2 trip detec-
P0442 S Fuel tank cracked, holed or damaged
tion logic)
S Charcoal canister cracked, holed or damaged
S Open or short in vapor pressure sensor circuit
S Vapor pressure sensor
S Fuel tank over fill check valve cracked or damaged
S ECM
2001 SIENNA (RM787U)
Author : Date : 226
DI-73
DIAGNOSTICS - ENGINE
WIRING DIAGRAM
J12 ECM
Vapor Pressure Sensor
1 14 6 J/C
3 Y 2 5V
Y Y Y Y VC
BA2 IC2 IH1 E11
B B
5 15 17
2 L-R L-R L-R PTNK
BA2 IC2 E8
13 16 13 18
1 W BR B B-W B-W BR E2
IH2 IC2 BA2 E11
E1
Engine Room J/B
12 VSV for EVAP
2 11 9 7
B-R B-Y B-Y LG EVP1
2J 3B 3A IH1 E11
7 1 2
3 1 E01
2K 2 3A
B-R 10
EFI G CCV
E8
Relay B-R B-R 2 1
5 EFI 2 1 IC2 VSV for CCV E01
L-O
No.1
B-R
3 2B 2F 4 3 BA2 14 17 3
W-R W-R W-R TBP
W W-B BA2 IC2 E7
EA B-R 2 1
From Terminal VSV for Pressure E01
From MREL of ECM
Battery Switching Valve A14830
INSPECTION PROCEDURE
HINT:
S If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440 or P0442, first troubleshoot DTC
P0441, P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 or P0442 next.
S Ask the customer whether, after the MIL came on, the customer found the fuel tank cap loose and tight-
ened it. Also ask the customer whether the fuel tank cap was loose when refuelling. If the fuel tank cap
was loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was not
sure if it was loose, troubleshoot according to the following procedure.
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
vapor pressure sensor.
2001 SIENNA (RM787U)
Author : Date : 227
DI-74
DIAGNOSTICS - ENGINE
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.
CHECK:
Check for cracks, deformation and loose connection of the fol-
lowing parts:
S Fuel tank
S Charcoal canister
S Fuel tank filler pipe
S Hoses and tubes around fuel tank and charcoal
canister
A10193
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-6 ).
NG Replace fuel tank cap.
OK
2001 SIENNA (RM787U)
Author : Date : 228
DI-75
DIAGNOSTICS - ENGINE
5 Check filler neck for damage.
PREPARATION:
Remove the fuel tank cap.
CHECK:
Visually inspect the filler neck for damage.
NG Replace filler pipe.
OK
6 Check vacuum hoses between vapor pressure sensor and fuel tank, charcoal
canister and VSV for pressure switching valve, and VSV for pressure switching
valve 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 and damage.
NG Repair or replace.
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-6 ), 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.
OK
2001 SIENNA (RM787U)
Author : Date : 229
DI-76
DIAGNOSTICS - ENGINE
8 Check charcoal canister for cracks, hole and damage (See page EC-6 ).
NG Replace charcoal canister.
OK
9 Check voltage between terminals VC and E2 of ECM connector.
ON
CHECK:
(a) Remove the grove compartment (See page SF-83 ).
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals VC and E2 of the ECM
connector.
OK:
VC (+) (-) E2
Voltage: 4.5 - 5.5 V
A02022
NG Check and replace ECM (See page IN-31 ).
OK
10 Check voltage between terminals PTNK and E2 of ECM connectors.
ON PREPARATION:
(a) Remove the grove compartment (See page SF-83 ).
(b) Remove the fuel tank cap.
E2 PTNK
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals PTNK and E2 of the
(-) (+)
ECM connectors.
OK:
A14870 Voltage: 3.3 V
OK Go to step 12.
NG
2001 SIENNA (RM787U)
Author : Date : 230
DI-77
DIAGNOSTICS - ENGINE
11 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-31 ).
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
12 Check fuel tank and fuel tank over fill check valve for cracks and damage.
NG Replace fuel tank or fuel tank over fill check
valve.
OK
It is likely that vehicle user did not properly close fuel tank cap. Please explain to customer how
to properly install fuel tank cap.
2001 SIENNA (RM787U)
Author : Date : 231
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