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Autopapyrus · Toyota Harrier 2.4 2AZ-FE (2004)
https://autopapyrus.com/guides/toyota/harrier/fuel-vapor-recovery-evap-system-inspection/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Toyota Harrier 2.4 2AZ-FE (2004): Fuel Vapor Recovery (EVAP) System Inspection

The EVAP system on the 2AZ-FE keeps gasoline vapors from escaping into the atmosphere. They are collected in a charcoal canister and burned in the engine through the purge valve. Typical causes of failure: a loose or leaking fuel cap, cracked lines, a stuck valve, or a clogged air passage. The inspection goes from simple to complex: visual check, reading codes, valve testing, leak finding.

DifficultyMedium Time1-2 hours Steps13

Key figures

  • Speed to start the EVAP system testaccelerate smoothly and hold the speed until the vehicle finishes the check by itself after the repair (step 13)
    70-90 km/h (43-56 mph)
  • Vapor pressure sensor voltage at restthis multimeter or scan tool reading is considered normal at atmospheric pressure (step 9)
    about 3.3 V

Check these values against the manufacturer’s specification for your vehicle before you start.

Parts

7
№PartGenuine part no.
01 Fuel filler capif faulty
02 EVAP system hoses and linesif faulty
03 Canister purge valve (VSV)if faulty 25860-28050
04 Canister closure valve (CCV)if faulty 25860-28050
05 Vapor pressure sensorif faulty
06 Canister fresh air filterif faulty
07 Charcoal canister assemblyif faulty

Part numbers are from the manufacturer's original catalogue. Check them against your VIN before ordering.

Tools

8
  • OBD scan tool (with active test commands)
  • hand vacuum pump with gauge
  • multimeter
  • fused jumper wire
  • EVAP smoke machine (recommended)
  • screwdriver and socket set
  • flashlight
  • inspection pit or lift

Step by step

13 steps
  1. Read the trouble codes with a scan tool. Typical EVAP codes are P0441 (purge flow problem), P0442, P0455, P0456 (leak), P0446 (canister closure valve), and P0450-P0453 (vapor pressure sensor). Write down the codes and freeze frame data, then clear them. If a code returns, the fault is confirmed.
  2. Inspect the fuel cap: the seal must not be torn or oily, and the cap must click when tightened. This is the most common cause of leak codes. If in doubt, install a known-good cap of the correct type for the model.
  3. Find the canister purge valve (VSV) under the hood. It is mounted on a bracket in the engine compartment, with a hose running to the intake tract and a line to the canister. Inspect the hoses and connector for cracks, kinks, and traces of oil.
  4. Test the purge valve. Shut off the engine and unplug the connector. Disconnect the hoses and blow through the valve by mouth: when de-energized, it must be closed. Apply 12 V to the valve with a jumper wire: it must open. Measure the coil resistance with a multimeter and compare it with the specification for this model. A valve stuck open causes P0441 and a rough idle after refueling.
  5. Raise the vehicle on a lift or place it over a pit. Find the canister: it is usually located at the rear under the floor next to the tank. On or near the canister are the closure valve, the vapor pressure sensor, and the air passage filter. Inspect the housing for cracks and traces of gasoline leaks.
  6. Check the lines between the tank, canister, and engine. Do not pinch or kink plastic lines during the inspection. Check the clamps and mounting points: lines often crack near the connectors.
  7. Check the fresh air passage. Air for the canister enters through a filter and a passage near the fuel filler neck. A clogged filter or an insect nest in the passage causes flow restriction codes. Blow out the passage and replace the filter if it is dirty.
  8. Test the canister closure valve (CCV) with the scan tool: activate it in the active test and listen for a click. If there is no click, check the power supply and coil resistance (per the specification), then the valve itself.
  9. Check the vapor pressure sensor. At rest at atmospheric pressure, its output voltage is about 3.3 V. Monitor its value with the scan tool while the valves are activated.
  10. Vacuum functional test. Warm up the engine and let the system purge at idle. Close the CCV valve through the scan tool or by applying power with a jumper wire. Read the system pressure: in a healthy system, vacuum builds up quickly. If vacuum does not build, disconnect the line from the refueling valve (on the tank), plug that port, and repeat. If the vacuum is now normal, the leak is on the tank side. If not, the leak is on the canister side or in the lines.
  11. Note on tightness. The refueling valve has a calibrated orifice that creates a constant small leak between the tank and the canister. Therefore, atmospheric pressure in the tank while purging is stopped is not considered a sign of a leak.
  12. Smoke leak testing. Feed smoke from an EVAP-approved smoke machine into the system service port (the green port on the line between the purge valve and the canister, if equipped) and look for smoke escaping at the cap, hoses, and canister housing. Do not use pressurized compressed air: it will damage the sensor and valves.
  13. After the repair, clear the codes and run the EVAP monitor. The most reliable way is to warm up the engine, accelerate smoothly to 70-90 km/h (43-56 mph), and hold that speed until the monitor completes. Check that the code has not returned and that the warning light is off.

Common mistakes and warnings

  • Work only outdoors or in a well-ventilated area, away from sparks and open flames: gasoline vapors are explosive
  • Do not smoke
  • When working under the vehicle, keep gasoline off your skin
  • If the inspection shows that the tank or canister must be removed, this is a higher-risk job: it is better to leave it to a repair shop
  • Check the specific valve resistance and pressure values against the manufacturer's specifications for your trim level