Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.

Verify with customer if fuel tank cap has been left off or not completely tightened recently. This may cause DTC to be set. Using Toyota hand-held tester or scan tool, read FREEZE FRAME data. Freeze frame data records engine conditions when malfunction is detected. 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 Figure. For EVAP emission control system wiring diagram, see Figure. When access to, or replacement of ECM is necessary, Engine Control Module (ECM) is located behind glove box. See Figure. For ECM connector terminal view, see Figure. For vacuum or EVAP hose routing, see VACUUM DIAGRAMS article. For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES - 4-CYLINDER article or SYSTEM & COMPONENT TESTING - 4-CYLINDER article. For removal and installation of components, see REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article.

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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 4-6)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 7-9)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 10-12)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 13-15)

Fig 6: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 16-18)

Fig 7: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 19-22)

Fig 8: DTC P0442 & DTC P0456 Diagnostic Procedure Using Toyota Hand-Held Tester (Steps 23-25)