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DI-101
DIAGNOSTICS - ENGINE
DI6VF-02
DTC P0450 Evaporative Emission Control System
Pressure Sensor Malfunction
DTC P0451 Evaporative Emission Control System
Pressure Sensor Range/Performance
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 P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunction.
ECM
Vapor Pressure Sensor
Fuel Tank Over
VSV for Fill Check Valve
EVAP
VSV for
CCV
Charcoal Canister Fuel Tank
A11986
DTC No. DTC Detecting Condition Trouble Area
10 seconds or less after engine starting condition (a) or (b)
continues for 7 seconds or more: (2 trip detection logic)
(a) Vapor pressure sensor value < -4.0 kPa (-30 mmHg, -1.2
P0450
in.Hg)
(b) Vapor pressure sensor value y 2.0 kPa (15 mmHg, 0.6 S Open or short in vapor pressure sensor circuit
in.Hg) S Vapor pressure sensor
Va or ressure
Vapor pressure sensor output extremely changes under condi- S ECM
tions of (a) or (b): (2 trip detection logic)
P0451 (a) Vehicle speed: 0 km/h (0mph),Engine speed: Idling and
VSV for pressure switching valve is OFF
(b) High vaver pressure senser
2002 ECHO (RM884U)
Author : Date : 271
DI-102
DIAGNOSTICS - ENGINE
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 trouble shoot 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.
1 Check voltage between terminals VC and E2 of ECM connector (See page
DI-80 ).
NG Check and replace ECM (See page IN-29 ).
OK
2 Check voltage between terminals PTNK and E2 of ECM connectors (See page
DI-80 ).
OK Check and replace ECM (See page IN-29 ).
NG
3 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.
2002 ECHO (RM884U)
Author : Date : 272
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