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DI-73
DIAGNOSTICS - ENGINE (5VZ-FE)
DI9O0-01
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 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
VSV for Vapor Pressure
pressure Sensor
(6) Switching
VSV for VSV
for EVAP Valve Fuel Tank Over
CCV (5) (4) (2) (1) Fill Check Valve
(10)
(7)
(8) (11)
(9)
(3)
Charcoal Canister Fuel Tank
A11954
2002 4RUNNER (RM887U)
Author : Date : 249
DI-74
DIAGNOSTICS - ENGINE (5VZ-FE)
Open Open
VSV for CCV
Closed
VSV for Open
Closed Closed
Pressure Switching Valve
Open Open
Closed Closed
VSV for EVAP
P0441 P0440, P0442 P0446
Negative Tank & Canister VSV for Pressure
Cold Start
ECT/IAT near same temp. Pressure Leak Check Switching Valve, CCV
Occurs Testing A14661
DTC No. DTC Detecting Condition Trouble Area
S Hose or tube cracked, hole, damaged or loose seal ((3) or (9)
After cold engine start. in Fig. 1)
After VSV for EVAP operation, the VSV for EVAP is turned off S Fuel tank cap incorrectly installed
sealing the vacuum in the system and the ECM begins to mon- S Fuel tank cap cracked or damaged
itor the pressure increase. S Vacuum hose cracked, holed, blocked, damaged or discon-
P0440 Some increase is normal. A very rapid, sharp increase in pres- nected ((1), (2), (4), (5), (6), (7), (8), (10)and (11) in Fig. 1)
P0442 sure indicates a leak in the EVAP system and sets the DTC S Fuel tank cracked, holed or damaged
P0440. S Charcoal canister cracked, holed or damaged
This monitoring method is also able to distinguish what is S Open or short in vapor pressure sensor circuit
called the small leak detection.(DTC P0442) S Vapor pressure sensor
A pressure rise just above normal indicates a very small hole. S Fuel tank over fill check valve cracked or damaged
S ECM
2002 4RUNNER (RM887U)
Author : Date : 250
DI-75
DIAGNOSTICS - ENGINE (5VZ-FE)
WIRING DIAGRAM
ECM
Vapor Pressure Sensor 3 3 6 25
3 G-B G-B G-B G-B VC
BN2 IE3 II4 E9
VC
5 2 14 24
PTNK 2 Y Y Y Y
BN2 IE3 II4 E9
PTNK
4 4 26 11
E2 1 L-B L-B L-B L-B E2
BN2 IE3 II4 E9
W
Engnie Room J/B
EFI
2 2
2 1
L-R
EFI Relay 1
W-L
2 2 IG1
5 3
VSV for
W-B Pressure
2 2
2 1 Switching
Valve
J2 A
V7
J/C VSV for EVAP
J/C D
W-L D
W-L
13 W-L W-G 14
J7 J7 II4 E10 EVP1
J1 A 1 2
W-L V13
W-B
VSV for CCV 19
EB L-B
E10 CCV
1 2
W-L
1 1 1
W-L W-L W-L
2 1 BZ1 BN2 IE3
R-Y
2 11 5 16 20
R-Y R-Y R-Y R-Y
BZ1 BN2 IE3 II4 E10 TBP
Battery 14 4
GR-B GR-B
IG1 E14 MREL
A18087
2002 4RUNNER (RM887U)
Author : Date : 251
DI-76
DIAGNOSTICS - ENGINE (5VZ-FE)
CONFIRMATION READINESS TEST
First Trip Procedure
(a) Vehicle must be cold, ambient temperature approximate-
ly between 50◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo