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DI-101
DIAGNOSTICS - ENGINE (5VZ-FE)
DI09X-09
DTC P0450 Evaporative Emission Control System Pres-
sure Sensor Malfunction
DTC P0451 Evaporative Emission Control System Pres-
sure 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
VSV for
VSV for VSV for Pressure Fuel Tank Over
CCV EVAP Switching Valve Fill Check Valve
Charcoal Canister Fuel Tank
A10145
DTC No. DTC Detecting Condition Trouble Area
10 seconds or less after engine starting condition vapor pres-
P0450 sure sensor fixed value continues for fixed value or more: (2
trip detection logic)
Vapor pressure sensor output extremely changes under condi- S Open or short in vapor pressure sensor circuit
tions of (a) and (b): (2 trip detection logic) S Vapor pressure sensor
(a) Vehicle speed: 0 km/h (0mph), Engine speed: Idling and S ECM
P0451
VSV for pressure switching valve is OFF
(b) vavor pressure sensor value y opening pressure valve of
charcoal canister
2002 4RUNNER (RM887U)
Author : Date : 277
DI-102
DIAGNOSTICS - ENGINE (5VZ-FE)
WIRING DIAGRAM
Refer to DTC P0440 on page DI-73 .
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 LEXUS 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.
1 Check voltage between terminals VC and E2 of ECM connector (See page
DI-73 , step 9).
NG Check and replace ECM (See page IN-28 ).
OK
2 Check voltage between terminals PTNK and E2 of ECM connectors (See page
DI-73 , step 10).
OK Check and replace ECM (See page IN-28 ).
NG
3 Check for open and short in harness and connector between vapor pressure
sensor and ECM (See page IN-28 ).
NG Repair or replace harness or connector.
OK
Replace vapor pressure sensor.
2002 4RUNNER (RM887U)
Author : Date : 278
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