DTC P0443-13: Evaporative Emission System Purge Control Valve "A" Circuit Open [09/2022 - ]: Procedure

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2024 Lexus IS 300, 2023 Lexus IS 300, 2022 Lexus IS 300, 2021 Lexus IS 300, and 2020 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST USING GTS (ACTIVATE THE EVAP PURGE VSV)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	VSV is on
*b	VSV is off

Connect the GTS to the DLC3.
Disconnect the fuel vapor feed hose (on the canister side) from the purge VSV.
Turn the engine switch on (IG).
Turn the GTS on.
Start the engine.

Enter the following menus: Powertrain / Engine / Active Test / Activate the EVAP Purge VSV.

Powertrain > Engine > Active Test

Tester Display
Activate the EVAP Purge VSV

When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction to your finger.

GTS Operation	Specified Condition
ON	Purge VSV port applies suction to finger
OFF	Purge VSV port applies no suction to finger

HINT:

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

Result

Proceed to
OK
NG

Result:

CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [08/2015 - ]

Result:

See step 2

INSPECT PURGE VSV

Inspect the purge VSV.

Refer to INSPECTION [08/2015 - ]

Result

Proceed to
OK
NG

Result:

REPLACE PURGE VSV. Refer to REMOVAL [08/2015 - ]

Result:

See step 3

CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Front view of wire harness connector (to Purge VSV)

Disconnect the purge VSV connector.
Turn the engine switch on (IG).

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
F87-1 - Body ground	Engine switch on (IG)	11 to 14 V

Result

Proceed to
OK
NG

Result:

See step 5

Result:

See step 4

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

Disconnect the purge VSV connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
F87-2 - F78-70 (PRG)	Always	Below 1 Ω
F87-2 or F78-70 (PRG) - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE ECM. Refer to REMOVAL [08/2015 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - PURGE VSV)

Disconnect the semiconductor pwr integration ECU connector.
Disconnect the purge VSV connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
2G-1 - F87-1	Always	Below 1 Ω
2G-1 or F87-1 - Body ground and other terminals	Always	10 kΩ or higher

Result

Proceed to
OK
NG

Result:

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to REMOVAL [04/2013 - ]

Result:

REPAIR OR REPLACE HARNESS OR CONNECTOR