Diagnosis & Repair

NOTE: Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected.

NOTE: When ENGINE RUN TIME in freeze frame data is less than 200 seconds, check vapor pressure sensor.

NOTE: In order to minimize time wasted diagnosing DTCs P0442 &/or P0456, it is recommended to perform "Confirmation Readiness Test" first to verify EVAP system readiness status and confirmation of DTC. See CONFIRMATION READINESS TEST .

For diagnosis and repair procedure with Toyota Hand-held tester, see Fig 1-Fig 8 .

For diagnosis and repair procedure with OBD II scan tool, see Figure-Figure in DTC P0441 & DTC P0446 diagnosis and repair.

For EVAP emission system component view, see Fig 10. For EVAP emission control system wiring diagram, see Figure. For access to, or replacement of ECM, Engine Control Module (ECM) is located behind glove box. See Figure. For ECM connector view, see Figure. For vacuum or EVAP hose routing, see VACUUM DIAGRAMS article. For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article or SYSTEM & COMPONENT TESTING - V6 & V8 article. For removal and installation of components, see REMOVAL & INSTALLATION - V6 & V8 article.

Fig 1: DTCs P0442 & P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 1-3)