Diagnosis & Repair

To minimize time wasted diagnosing EVAP system leaks it is recommended to perform Confirmation Readiness Test first to check readiness status and DTC verification before performing repairs. See CONFIRMATION READINESS TEST .

For diagnosis and repair procedure with Toyota hand-held tester or Enhanced OBD II scan tool, see Fig 1-Fig 9 . For diagnosis and repair procedure with generic OBD II scan tool, see Fig 1 and Fig 10-Fig 15 .

For wiring diagram, see Fig 16. For system components views, see Fig 17, Fig 18, Fig 19, Fig 20, Fig 22 & Fig 23

For ECM location, see Figure. For ECM connector view, see Figure. To identify circuits referenced in testing, See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. For vacuum or EVAP hose routing, see VACUUM DIAGRAMS article. For testing of systems or components, see SYSTEM & COMPONENT TESTING - V6 & V8 article. For removal and installation of components, see REMOVAL & INSTALLATION - V6 & V8 article.

Fig 1: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure (Introduction)

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Fig 2: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Steps 1-5)

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Fig 3: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Steps 6-9)

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Fig 4: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Steps 10-11)

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Fig 5: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Steps 12-14)

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Fig 6: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Step 15)

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Fig 7: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Steps 16-18)

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Fig 8: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Steps 19-22)

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Fig 9: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using Hand-Held Tester (Step 22 Cont. & Steps 22-24)

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Fig 10: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using OBD II Scan Tool (Steps 1-5)

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Fig 11: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using OBD II Scan Tool (Steps 6-9)

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Fig 12: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using OBD II Scan Tool (Steps 10-12)

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Fig 13: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using OBD II Scan Tool (Steps 13-15)

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Fig 14: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using OBD II Scan Tool (Steps 16-17)

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Fig 15: DTCs P0441, P0442, P0446 & P0456 Diagnostic Procedure Using OBD II Scan Tool (Steps 18-20)

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Fig 16: EVAP System Wiring Diagram

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Fig 17: Locating EVAP System Components

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Fig 18: Locating EVAP System Components

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Fig 19: Layout Of EVAP System Components

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Fig 20: Disconnecting Vacuum Hose At Charcoal Canister For EVAP VSV

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Fig 21: Removing & Installing EVAP Vapor Canister

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Fig 22: Identifying EVAP Vacuum Switching Valve Ports

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Fig 23: Locating Vapor Pressure Sensor Vacuum Switching Valve & Identifying Vapor Pressure Sensor Vacuum Switching Valve Ports

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