Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS1997ES 300 V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTECHNICAL SERVICE BULLETINSMIL ON DTC P0441/P0446 EVAP SYSTEM
1997 Lexus ES 300 V6-3.0L (1MZ-FE)
MIL ON DTC P0441/P0446 EVAP System
1997 Lexus ES 300 V6-3.0L (1MZ-FE)SECTION MIL ON DTC P0441/P0446 EVAP System
ENGINE
EG001-98
Title:
EVAP SYSTEM DIAGNOSIS: P0441/P0446
Models:
ES 300, SC 400, LS 400, LX 45
Apri1 3, 1998
Introduction
The following procedure is recommended for repair of MIL "ON" conditions involving confirmed DTC P0441 and P0446.
Affected Vehicles
^ All ES 300, SC 400, LS 400, LX 450 that display a code P0441 or P0446.
Repair Procedure
A. Diagnostics for P0441:
1. Remove Vacuum Hoses between EVAP VSV and Charcoal Canister and discard.
2. If there is a metal vapor pipe between EVAP VSV and Charcoal Canister, clean inside of vapor pipe.
3. Replace EVAP VSV and Charcoal Canister assembly with new parts.
4. Install new vacuum hoses between EVAP VSV and Charcoal Canister.
B. Diagnostics for P0446:
1. Inspect vacuum hoses and pipes between EVAP (Purge) VSV and Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and Canister.
NOTE:
When performing diagnostics for an occurrence of a MIL "ON" condition, the Diagnostic Trouble Code (DTC) P0441 may be the result of debris in the Evaporative Emission Control System. This may cause blockage of a vapor line, or a stuck VSV, as described in the troubleshooting area of the Repair Manual.
Warranty Information
EG001-98
Title:
EVAP SYSTEM DIAGNOSIS: P0441/P0446
Models:
ES 300, SC 400, LS 400, LX 45
Apri1 3, 1998
Introduction
The following procedure is recommended for repair of MIL "ON" conditions involving confirmed DTC P0441 and P0446.
Affected Vehicles
^ All ES 300, SC 400, LS 400, LX 450 that display a code P0441 or P0446.
Repair Procedure
A. Diagnostics for P0441:
1. Remove Vacuum Hoses between EVAP VSV and Charcoal Canister and discard.
2. If there is a metal vapor pipe between EVAP VSV and Charcoal Canister, clean inside of vapor pipe.
3. Replace EVAP VSV and Charcoal Canister assembly with new parts.
4. Install new vacuum hoses between EVAP VSV and Charcoal Canister.
B. Diagnostics for P0446:
1. Inspect vacuum hoses and pipes between EVAP (Purge) VSV and Charcoal Canister for leaks.
2. Replace Vapor Pressure VSV and Canister.
NOTE:
When performing diagnostics for an occurrence of a MIL "ON" condition, the Diagnostic Trouble Code (DTC) P0441 may be the result of debris in the Evaporative Emission Control System. This may cause blockage of a vapor line, or a stuck VSV, as described in the troubleshooting area of the Repair Manual.
Warranty Information
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.