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                                               DIAGNOSTICS        -   ENGINE

    DTC              P0450                Evaporative Emission Control System
                                          Pressure Sensor Malfunction

    DTC              P0451                Evaporative Emission Control System
                                          Pressure Sensor Range/Performance

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.


                                                                                             Vapor Pressure Sensor

                                                                                                           Fuel Tank Over
                                VSV for                                                                    Fill Check Valve

                      VSV for

                                 Charcoal Canister                                               Fuel Tank


  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
            (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
                                           DIAGNOSTICS   -   ENGINE

Refer to DTC P0440 on page DI-80 .

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 ).


     2      Check voltage between terminals PTNK and E2 of ECM connectors (See page
            DI-80 ).

                                                  OK         Check and replace ECM (See page IN-29 ).


     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.


    Replace vapor pressure sensor.

2002 ECHO (RM884U)

                                                                      Author :        Date :              272

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