Inspect Evap System Line

a. Warm up the engine and stop the engine.

Allow the engine to warm up to normal operating temperature.

b. Install a vacuum gauge (EVAP control system test equipment vacuum gauge) to the EVAP service port on the purge line.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

Evap System Tester

Fig. 8: Installing Vacuum Gauge

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 8: Installing Vacuum Gauge

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

c. TOYOTA Hand-Held Tester:

Forced driving of the VSV for the EVAP.

1. Connect a TOYOTA hand-held tester to the DLC3.

2. Start the engine.

3. Push the TOYOTA hand-held tester main switch ON.

4. Use the ACTIVE TEST mode on the TOYOTA hand-held tester to operate the VSV for the EVAP.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

2010 Tacoma Dlc3
Fig. 9: Connecting Hand-Held Tester To DLC3 Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

d. If you have no TOYOTA Hand-Held Tester:

Forced driving of the VSV for the EVAP.

1. Disconnect the VSV connector for the EVAP.

2. Connect the positive (+) and negative (-) leads from the battery to the VSV terminals for the EVAP.

3. Start the engine.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

Evap Vsv Tacoma

Fig. 10: Connecting Positive (+) And Negative (-) Leads From Battery To VSV Terminals For EVAP

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 10: Connecting Positive (+) And Negative (-) Leads From Battery To VSV Terminals For EVAP

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

e. Check the vacuum at idle.

Vacuum: Maintain at 0.368 - 19.713 in. Hg (5 - 268 in. Aq) for over 5 seconds

HINT:

If the vacuum does not change, you can conclude that the hose connecting the VSV to the service port has come loose or is blocked, or the VSV is malfunctioning.

f. TOYOTA Hand-Held Tester:

Conclude forced driving of the VSV for the EVAP.

1. Stop the engine.

2. Disconnect the TOYOTA hand-held tester from the DLC3. g. If you have no TOYOTA Hand-Held Tester:

Conclude forced driving of the VSV for the EVAP.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

1. Stop the engine.

2. Disconnect the positive (+) and negative (-) leads from the battery from the VSV terminals for the EVAP.

3. Connect the VSV connector for the EVAP.

h. Disconnect the vacuum gauge from the EVAP service port on the purge line.

i. Connect a pressure gauge to the EVAP service port on the purge line.

Toyota Celica Evap

Fig. 11: Checking Vacuum At Idle

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 11: Checking Vacuum At Idle

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

j. Check the pressure.

1. Close off the yellow marked position of the air drain hose with a hose clipper or similar instrument.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

Yaris Air Conditioning Drain Hose
Fig. 12: Closing Off Yellow Marked Position Of Air Drain Hose With Hose Clipper Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2. Add the pressure (13.5 - 15.5 in. Aq) from the EVAP service port.

Pressure: 2 minutes after the pressure is added, the gauge should be over 7.7 - 8.8 in.

HINT:

If you can't add pressure, you can conclude that the hose connecting the VSV - canister - fuel tank has slipped off or the VSV is open.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

Pressure

2001 Corolla Evap Vsv

Fig. 13: Checking Pressure

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 13: Checking Pressure

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

3. Check if the pressure decreases when the fuel tank cap is removed while adding pressure. HINT:

If the pressure does not decrease when the filler cap is removed, then you can conclude that the hose connecting the service port to the fuel tank is blocked, etc.

k. Disconnect the pressure gauge from the EVAP service port on the purge line.

2004 ENGINE PERFORMANCE Emission Control System - Sequoia

Blocked Evap Purge Line

Fig. 14: Removing Fuel Tank Cap

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 14: Removing Fuel Tank Cap

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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.

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Responses

  • Russom
    How to test vsv sequoia?
    7 years ago
  • thomas
    Where to install vacuum meter celica supra?
    7 years ago
  • Anna
    What lines connect where charcoal canister 2004 Rav4?
    6 months ago
  • artemio mazzi
    How to test charcoal canister on 2004 Rav4?
    2 months ago

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