Toyota 2015 4runner Evap Leak Detection Pump

Malfunction

DTCs.

Monitoring Items

Detection Conditions

Trouble Areas

Detection Timings

Detection Logic

Leak detection pump

creates negative

pressure (vacuum) in

P0441

Purge VSV (Vacuum Switching Valve) stuck open

EVAP system and EVAP system pressure measured. 0.02 inch leak criterion measured at start and at end of leak check. If stabilized pressure

• Connector/wire harness (Purge VSV -ECM)

• Canister pump module

• Leakage from EVAP system

While ignition switch OFF

2 trip

higher than [second 0.02 inch leak criterion x 0.2], ECM

determines that

purge VSV stuck

open

After EVAP leak

check performed,

purge VSV turned

ON (open), and

atmospheric air

• Purge VSV

introduced into EVAP

• Connector/wire

system. 0.02 inch

harness

leak criterion

(Purge VSV -

P0441

Purge VSV stuck

measured at start

ECM)

While ignition switch

2 trip

If pressure does not return to near atmospheric pressure, ECM determines that purge VSV stuck closed

• Canister pump module

• Leakage from EVAP system

OFF

While engine running,

following conditions

successively met:

• Negative

pressure not

created in EVAP

system when purge VSV turned ON (open) • EVAP system pressure change

• Connector/wire harness (Purge VSV -ECM)

• Leakage from EVAP line (Purge VSV -Intake manifold)

• ECM

P0441

Purge flow

less than 0.5 kPa (3.75 mmHg) when vent valve turned ON (closed) • Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa (0.75 mmHg)

While engine running

2 trip

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

Get My Free Ebook


Post a comment