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Removal (Avalon)

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  1. Air intake chamber and intake manifold must be removed for access to knock sensors. Knock sensors are located on cylinder block, just below cylinder heads. See Fig 1.
  2. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEMS.
  3. Drain cooling system.
  4. Remove air cleaner hose and "V" bank cover. See Figure.
  5. Disconnect control cables, electrical connectors, vacuum hoses and coolant hoses at each throttle body.
  6. Disconnect electrical connectors and vacuum hoses from vacuum switching valves on emission control valve set located on side of air intake chamber. See Figure.
  7. On Avalon, remove data link connector No. 1 from bracket on end of air intake chamber. See Figure.
  8. Remove nuts and disconnect power steering pressure tube (if equipped) from engine hanger.
  9. Disconnect necessary electrical connectors, ground straps, air assist hoses (if equipped) and vacuum hoses for removal of air intake chamber and intake manifold.
  10. Disconnect PCV hose from PCV valve on rear cylinder head.
  11. Remove bolts, engine hanger and throttle body bracket. See Figure.
  12. Remove bolts/nuts, air intake chamber and gasket. Note location of electrical connectors on fuel injectors for installation reference. Disconnect electrical connectors at fuel injectors.
  13. Remove fuel pipe clamp from No. 1 fuel pipe at fuel filter. Perform STEP 1 in illustration. See Figure. Ensure area around No. 1 fuel pipe and fuel filter is clean.
    CAUTION: Use care when disconnecting No. 1 fuel pipe from fuel filter, as some residual fuel pressure may still exist in the fuel system.
  14. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel filter. Perform STEP 2 in illustration. See Figure.
  15. Disconnect coolant hoses at intake manifold. Remove bolts/nuts and intake manifold with fuel injectors and fuel rails as an assembly. Remove gaskets for intake manifold.
  16. Disconnect electrical connectors and hoses for removal of coolant housing. Coolant housing is located on cylinder block, in front of manifold area. See Figure. Remove bolts/nut, coolant housing and gaskets.
  17. Disconnect electrical connectors at knock sensors. Remove knock sensors from cylinder block using Backup Light Switch Socket (SST 09817-16011), or equivalent.
Fig 1: Locating Knock Sensors (Avalon, Camry, Camry Solara, Highlander & Sienna)
G97H06883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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