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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 32 (Engine Controls - Removal, Overhaul & Installation V6 & V8) >> Engine Sensors & Switches >> Knock Sensor >> Removal (Avalon, Camry, Camry Solara & Highlander)

Removal (Avalon, Camry, Camry Solara & Highlander)

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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. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  under FUEL SYSTEMS. Drain cooling system.
  2. On Camry, Camry Solara and Highlander, remove suspension upper brace. Suspension upper brace fits between strut towers and is bolted to top of each strut tower. On all models, remove air cleaner hose and "V" bank cover. See Figure-Figure . On Camry Solara, remove bolts and engine mount support brace for engine mount at timing belt end of engine. Engine mount support brace fits from top of coolant housing to the engine mount.
  3. On Avalon and Highlander, disconnect control cables, electrical connectors, vacuum hoses and coolant hoses at each throttle body. On Camry Solara, remove spark plug wire assembly if necessary for access to air intake chamber and intake manifold. On Camry and Camry Solara, disconnect control cables, electrical connectors, vacuum hoses and coolant hoses at throttle body.
  4. On all models, disconnect electrical connectors and vacuum hoses from vacuum switching valves on emission control valve set located on side of air intake chamber. See Figure-Figure .
  5. On Avalon, remove data link connector No. 1 from bracket on end of air intake chamber. See Figure. On all models, remove nuts and disconnect power steering pressure tube (if equipped) from engine hanger. Disconnect necessary electrical connectors, ground straps, air assist hoses (if equipped) and vacuum hoses for removal of air intake chamber and intake manifold. Disconnect PCV hose from PCV valve on rear cylinder head.
  6. On Avalon and Highlander, remove bolts, engine hanger and throttle body bracket. See Figure. On Camry and Camry Solara, remove bolts, engine hanger and air intake chamber support brace from air intake chamber. Remove nuts, EGR pipe and gaskets. See Figure and Figure .
  7. On all models, 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. On Avalon and Camry Solara, go to next step. On Camry and Highlander, go to step  10.
  8. On Avalon and Camry Solara, 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.
    9. CAUTION: Use care when disconnecting No. 1 fuel pipe from fuel filter, as some residual fuel pressure may still exist in the fuel system.
  9. Depress both sides of retainer and pull No. 1 fuel pipe with disconnect fitting from fuel filter. Perform STEP 2 in illustration. See Figure. Go to step  12.
  10. On Camry and Highlander, remove fuel pipe clamp from disconnect fitting at end of No. 1 fuel pipe. See Figure. Ensure area around No. 1 fuel pipe and disconnect fitting is clean.
    11. CAUTION: Use care when disconnecting No. 1 fuel pipe from fuel pipe fitting, as some residual fuel pressure may still exist in the fuel system.
  11. Depress both tabs and pull No. 1 fuel pipe with disconnect fitting from fuel pipe fitting. See Figure. Go to next step.
  12. On all models, 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.
  13. Disconnect electrical connectors and hoses for removal of coolant housing. Coolant housing is located on cylinder block, in front of intake manifold area. See Figure-Figure . Remove bolts/nuts, coolant housing and gaskets. Disconnect electrical connectors at knock sensors. On Avalon and Camry Solara, using Socket (SST 09817-16011), remove knock sensor(s) from cylinder block. On Camry and Highlander, using Socket (SST 09816-30010), remove knock sensor(s) from cylinder block.
    Fig 1: Locating Knock Sensors (Avalon, Camry, Camry Solara, Highlander & Sienna)
    G97H06883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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