Circuit Description

WARNING: This page is about a different variant/trim than selected.

The vapor pressure sensor, VSV for CCV (Vacuum Switching Valve for Canister Closed Valve), VSV for EVAP (Evaporative Emission), and VSV for pressure switching valve are used to detect abnormalities in the EVAP control system.

The ECM determines whether there is an abnormality in the EVAP control system based on the vapor pressure sensor signal.

DTCs P0441 and P0446 are set by the ECM when evaporative emissions leak from the components within the dotted line in Figure below, and when there is a malfunction in the VSV for CCV, VSV for EVAP, and VSV for pressure switching valve, or in the vapor pressure sensor itself.

Fig 1: Evaporative Emission Control System - Circuit Description Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Evaporative Emission Control System - Circuit Description Diagram (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: DTC P0441 AND P0446 - Trouble Detection Chart

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Typical DTC outputs of each trouble area are as follows.

DTC OUTPUTS REFERENCE

Trouble Areas

Typical DTC Outputs (⁽¹⁾)

Small leak

P0442 and/or P0456 (⁽²⁾)

Medium leak (e.g., Vacuum hose loose)

P0442

Large leak (e.g., Fuel tank cap loose)

P0441, P0442 and P0446

VSV for EVAP

Open Malfunction

P0441

VSV for EVAP

Closed Malfunction

P0441, P0442 and P0446

VSV for CCV

Open Malfunction

P0441, P0442 and P0446

VSV for CCV

Closed Malfunction

P0446

VSV for Pressure Switching Valve

Open Malfunction

P0446

VSV for Pressure Switching Valve

Closed Malfunction

P0441, P0442 and P0446

⁽¹⁾	The ECM may output some other DTC combinations.

⁽²⁾	Refer to P0442 and P0456 on DTC P0442 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (SMALL LEAK), DTC P0456 EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED (VERY SMALL LEAK) .